Wire Breakage Research Articles

Effects of Na2O, K2O and B2O3 on Deformability of SiO2-MnO-Al2O3 Inclusion in High-Carbon Steel

Cord steel is used for making tire frames and wire saws for cutting silicon wafers. The diameter of mainstream cutting wire has been developed to be lower than 100 μm. The size and deformation ability of inclusions are very important to the wire breaking rate of cord steel during the drawing process. In order to improve the deformation ability of the inclusions in cord steel, alkali metal oxide was added into the molten steel to improve the inclusions in the steel so as to obtain good, plastic, low-melting-point inclusions. Mass fractions of 0.3%, 0.5% and 1.0% K2CO3, Na2CO3 and B2O3 were added into cord steel, which were melted in 10 furnaces (including 0% alkali metal oxides, mass fractions of 0.3%/0.5%/1.0% K2CO3, Na2CO3 and B2O3). The morphology and composition of inclusions were observed by SEM-EDS. Factsage phase diagram calculations and experimental results show that, with the increase in Na2CO3 content in cord steel, the aluminum content in the inclusions gradually decreased. When the mass fraction of Na2CO3 was 0.5% per ton, most of the inclusions in the steel fell in the low melting point region (less than 1300 °C). With the increase in K2CO3 content in cord steel, the silicon content in the inclusions decreased gradually. When the mass fraction of K2CO3 was 0.5% per ton, most of the inclusions in the steel fell in the low melting point region. The deformation ability of the inclusions added with 0.5% Na2CO3 in the steel during forging was better than that of the inclusions added with 0.5% K2CO3. After adding B2O3, the inclusions in the steel were SiO2-MnO-Al2O3 inclusions or inclusions with SiO2-MnO-Al2O3 as the core and BN wrapped around. Boron could not be dissolved into the inclusions for plastic modification.

A Finite Element Model for a 6 × K31WS + FC Wire Rope and a Study on Its Mechanical Responses with or without Wire Breakage

The special spatial structure and the long-term harsh working environment make the transient response of wire rope complicated, so accurate assessment and prediction of its mechanical characteristics are of great significance to ensure the safe and stable operation of related equipment. In this paper, a method is proposed for the analysis of the mechanical characteristics of a 6 × K31WS + FC wire rope with or without wire breakage. Firstly, an accurate parametric geometric model of the wire rope is established based on the Frenet frame method, the material properties of the wire rope are acquired by experiments, and the finite element model of the wire rope is built. Then, a mechanical model of the wire rope is proposed to verify the validity of the finite element model. Finally, the influences of the number, distribution, and location of the broken wires on the mechanical characteristics of the wire rope are thoroughly analyzed. This work proposes a comprehensive framework that can quantitatively analyze the mechanical characteristics of the complex wire rope with or without wire breakage, which provides a practical method for its reliability and maintenance evaluation and has guiding significance for the shape design and structural optimization of the wire rope.

The impacts of CFRP widths and thicknesses on the strengthening of PCCP

Wire breakage is a regular occurrence of prestressed concrete cylinder pipe (PCCP). This research investigates the impact of fiber reinforced polymer (CFRP) width and thickness on the strengthening effect of the new technology (i.e. externally wrapping CFRP to strengthen a PCCP). Firstly, using the finite element method (FEM), a three-dimensional numerical model of PCCP is established, and the model is validated and verified using existing test data. Following that, the stress and strain changes of each material in PCCP when repaired with various CFRP thicknesses and widths are examined, as well as the improvement in PCCP bearing capacity. Finally, the impacts of CFRP thickness and width on the internal pressure threshold are investigated, based on visible cracks in the concrete core. The difference between FEM and test is 2.4% under internal working pressure. After CFRP reaches 10 layers, the growing trend of PCCP bearing capacity slows down under a broken wire ratio of 10%. The broken wire ratio has a significant impact on PCCP bearing capacity, which increases as the widths and layers of CFRP grow, although the trend gradually decreases.

Development and thermo-mechanical reliability assessment of fiber reinforced polymers in lightweight PV modules towards vehicle-integrated photovoltaics

Weight reduction by omitting the use of bulky glass in c-Si photovoltaic (PV) modules is an important consideration of module development for vehicle-integrated photovoltaics (VIPV). Various approaches to achieve lightweight modules are proposed, yet there are many concerns regarding the reliability of such modules compared to standard glass-glass or glass-backsheet configurations. In this work, we investigate the thermo-mechanical behavior of LW modules with a multiwire design specifically aiming to VIPV applications. The developed modules consist of a commercially available carbon-fiber reinforced polypropylene backsheet and are compared to glass-fiber reinforced polypropylene backsheet modules. To enhance the thermo-mechanical reliability, polymer encapsulant and interconnection foil are substituted by glass-fiber reinforced composite encapsulant with the carbon-fiber reinforced polypropylene backsheet, thereby leading to ∼2.9% fill factor (FF) decrease with a limited degradation after 200 thermal cycles. A failure mechanism analysis using electroluminescence and X-ray-based micro-tomography is carried out after thermal cycling tests, clearly demonstrating that thermal stresses introduce deformation of wire interconnects. A modified high-temperature thermal cycling test (- 40 to 110 °C, 3.5 h) is implemented to observe the fast degradation of interconnects in compliance with VIPV conditions. The resulting fatigue stresses account for wire breakage in-between cells in the glass-fiber reinforced polypropylene module, while this effect is less pronounced in the carbon-fiber reinforced polypropylene backsheet module, indicating better thermo-mechanical reliability of the carbon-fiber reinforced polypropylene backsheet module. Herein, the current results could provide guidelines for lightweight PV module design (with a weight of 4.8 kg/m2) in the thermo-mechanical aspect. This research sheds light on the potential of lightweight modules specifically for VIPV applications.

Development of high strength welding consumable for arc welding carbon steels

High-tensile gas metal arc welding (GMAW) consumables are becoming increasingly common in industries such as Railways, Lifting, and Excavation (L&E) due to the need for superior mechanical performance. AWS ER90S-G grade welding consumable (with a minimum of UTS 620 MPa) is widely used alongside the commonly used AWS ER70S-6 (with a minimum of UTS 480 MPa). However, the microstructure of high-tensile wire rods often contains hard phases such as martensite, making it difficult to draw. To overcome this challenge, ER90S-G grade welding wire development was studied using microstructural analysis, mechanical testing, and physical simulations. The input material (wire rod) underwent mechanical descaling, dry drawing, intermediate annealing, wet drawing, copper coating, and spooling to produce a final wire with a diameter of 1.2 mm. A suitable microstructure (Ferrite + Carbides) is crucial for smooth wire drawing, and it is highly recommended to anneal at the intermediate stage to avoid wire breakages.

Determination of the influence of geometrical parameters of rope blocks on the durability of a rope

Problem The durability of crane ropes is very important, as it provides not only the main costs of operating a lifting machine, but also the safety of loading and unloading operations. Rope operating conditions have a significant impact on the period of its use, but they are not always taken into account. Gool. The rope calculation methodology reflected in the standard does not take into account the operating conditions of the rope, so it is very difficult to predict its exact durability. In modern educational and reference literature, the influence of the size and geometry of rope blocks on the durability of hoisting ropes is underestimated. Methodology. The main criterion that is taken into account when choosing a rope according to existing methods is the tensile force of the rope, although studies by many well-known scientists show that the rope wires break as a result of bending on the blocks and drum. The diameter of the block is selected depending on the diameter of the rope and the mode of operation of the lifting mechanism. The material of the block and its geometry are not taken into account at all when choosing the type of rope and its diameter, while the wear of the surfaces of the rope and block greatly affects the durability of these elements of the hoisting mechanism. Determining the factors that affect rope wear and reduce its durability is a rather important task and requires not only theoretical but also experimental studies. Results. Ropes of various designs and diameters were considered. This made it possible to evaluate the influence of various elements of the rope and the block on the predicted durability of the rope. Originality. The studies made it possible to improve the formula of B.S. Kovalsky, which he proposed for selecting the diameter of the rope by service life. The dependence of the influence of the angle of opening of the block's groove, which is determined from the condition of reducing the torsion of the rope during its deviation, on the rope's durability was obtained. Practical value To obtain a more realistic picture of the load on a rope that is bent on a block and drum, the calculation scheme was improved and the number of factors that have a significant impact on the rope's durability was increased. The results of the study significantly bring the conditions of rope loading during its bending on the block and drum closer to real values.

EXTERNAL FIXATION COMBINED WITH A MODIFIED MINIMALLY INVASIVE AC JOINT RECONSTRUCTION SYSTEM IN ACUTE AND CHRONIC ACROMIOCLAVICULAR DISLOCATIONS

Background: Acromioclavicular joint (ACJ) dislocations are among one of the most common injuries of the shoulder and still a challenge for surgeons. We propose a technique that combines the advantages of external fixation (to obtain a stable reduction of ACJ) and a modified suspension device system (for minimally invasive ACJ reconstruction) in acute dislocations. We tend to add associate augmentation of autologous semitendinosus graft to supply a biological reconstruction of the coracoclavicular (CC) ligaments in chronic dislocations. Material and Methods: We enrolled 8 patients, 6 with acute and 2 with chronic injuries. Inclusion criteria were the following: types IV, V, and VI ACJ dislocations; type III ACJ dislocations in high-demand patients. Exclusion criteria were the following: asymptomatic chronic ACJ dislocation without functional impairment, previous coracoid or clavicle fracture, nonparticipating patients, alcohol abusers, previous infection, and neurological problems. The external fixator was removed at 40 days after surgery and patients were followed up clinically (through Constant Score and Simple Shoulder Test Questionnaires) and radiologically for the first three months, at six months and one year after surgery. Results: In all cases, radiographic ACJ reduction was maintained at a minimum one-year follow-up. Steel wire breakage occurred in one patient but the retained tip in the clavicle was asymptomatic; we report no further complications. Shoulder active and passive range of motion was painless in all patients; the Constant score (CS) was 85/100 and the Simple Shoulder Test (SST) score was 9/10 on average at one year of follow-up. Conclusions: Our technique demonstrated stable joint reduction and good functional outcomes at one-year follow-up and it seems to be promising, but more clinical and biomechanical studies are required to confirm these encouraging results.

Primary Arthroplasty for Unstable and Failed Intertrochanteric Fractures: Role of Multi-Planar Trochanteric Wiring Technique.

The primary objective of the current study is to demonstrate the trochanteric wiring technique. A secondary objective is to evaluate the clinico-radiological outcomes of use of the wiring technique during primary arthroplasty for treatment of unstable and failed intertrochanteric fractures. A prospective study including follow-up of 127 patients with unstable and failed intertrochanteric fractures who underwent primary hip arthroplasty using novel multi-planar trochanteric wiring was conducted. The average follow-up period was 17.8±4.7 months. Clinical assessment was performed using the Harris hip score (HHS). Radiographic evaluation was performed for assessment of union of the trochanter and any mechanical failure. P<0.05 was considered statistically significant. At the latest follow-up, the mean HHS showed significant improvement from 79.9±1.8 (at three months) to 91.6±5.1 (P<0.05). In addition, no significant difference in the HHS was observed between male and female patients (P=0.29) and between fresh and failed intertrochanteric fractures (P=0.08). Union was achieved in all cases of fractured trochanter, except one. Wire breakage was observed in three patients. There were five cases of limb length discrepancy, three cases of lurch, and three cases of wire-related bursitis. There were no cases of dislocation or infection. Radiographs showed stable prosthesis in situ with no evidence of subsidence. Use of the proposed wiring technique was helpful in restoring the abductor level arm and multi-planar stability, which enabled better rehabilitation and resulted in excellent clinical and radiological outcomes with minimal risk of mechanical failure.

Bipolar Hemiarthroplasty in Unstable Intertrochanteric Fractures with an Effective Wiring Technique.

Bipolar hemiarthroplasty has recently been acknowledged as an effective option for treatment of unstable intertrochanteric fracture. Trochanteric fragment nonunion can cause postoperative weakness of the abductor muscle and dislocation; therefore, reduction and fixation of the fragment is essential. The purpose of this study was to perform an evaluation and analysis of the outcomes of bipolar hemiarthroplasty using a useful wiring technique for management of unstable intertrochanteric fractures. A total of 217 patients who underwent bipolar hemiarthroplasty using a cementless stem and a wiring technique for management of unstable intertrochanteric femoral fractures (AO/OTA classification 31-A2) at our hospital from January 2017 to December 2020 were included in this study. Evaluation of clinical outcomes was performed using the Harris hip score (HHS) and the ambulatory capacity reported by patients was classified according to Koval stage at six months postoperatively. Evaluation of radiologic outcomes for subsidence, breakage of wiring, and loosening was also performed using plain radiographs at six months postoperatively. Among 217 patients, five patients died during the follow-up period as a result of problems unrelated to the operation. The mean HHS was 75±12 and the mean Koval category before the injury was 2.5±1.8. A broken wire was detected around the greater trochanter and lesser trochanter in 25 patients (11.5%). The mean distance of stem subsidence was 2.2±1.7 mm. Our wiring fixation technique can be regarded as an effective additional surgical option for fixation of trochanteric fracture fragments during performance of bipolar hemiarthroplasty.

Optimisation of transmission towers under multiple load cases and constraint conditions with the KSM-GA method

Transmission towers operate in complex engineering environments, such as gravity, strong winds, ice and snow, wire breaking and unbalanced loads. Owing to complicated structural parameters, multiple load cases and multiple constraint conditions, the optimal design plan of the structure is difficult to acquire. Popular intelligent algorithms (Genetic Algorithm, GA; Particle Swarm Optimisation, PSO; and others) need to spend time in structural mechanical computation and search processes. To solve this problem, the commercial FE software ABAQUS was used to build the full parametric analytical and computational sub-procedures (general static, linear buckling and cost computation) for the transmission tower under multiple load cases and constraint conditions. Then, the main algorithm procedure, KSM-GA, was developed based on the GA optimiser and Kriging Surrogate Model (KSM). The KSM-GA could import the design variables (such as cross-section properties and structural dimensions) of the transmission tower into the FE computational sub-procedures and read the results (including stresses, displacements, buckling load and weight). The results show that the KSM-GA can reduce the search time more than 30% compared with the GA, PSO and BO-GP( Bayesian Optimisation with Gaussian Process) while the training precision of the KSM is above 99% accuracy of the FE results.

Design methodology of intelligent autonomous distributed hybrid power complexes with renewable energy sources

The paper proposes a methodology for designing intelligent systems of autonomous distributed hybrid power complexes (ADHPC) ensuring a minimum level of energy consumption from the national external grid as well as diesel power plants used to deliver the power to regional households, and industrial consumers. It will be realized because of the effective use of generated energy from renewable energy sources in such ADHPC systems by considering their both normal and emergency operating modes. In doing so, ADHPC will not only help offload the existing power grid during peak demand, but also allow for significant process efficiencies in energy production from renewable energy sources (RES), including “green” hydrogen: for instance, the excess energy is accumulated during the period of its excess and is provided back to power consumers in the period of shortage, the electricity losses are reduced since effective management is applied for power flows circulating in the ADHPC systems. The methodology includes the following stages (subtasks): development of the structure of a distributed hybrid system for generating and transporting electricity from sources to consumers; development of a system for diagnostics of failures of generating units and wire breaks in sections of local power transportation networks and management based on the diagnostics results of power flows circulating in the ADHPC systems for both normal and emergency modes. Therefore, a balance of power capacities and minimization of their losses are ensured.

Novel drawing technology for high area reduction manufacturing of ultra-thin brass wires

A significant increase in roughness of dieless-drawn wires due to the strain-induced roughness phenomenon has been documented. For small-diameter wires, even a slight surface relief creates stress concentrations that may contribute to the wire breakage during cold drawing. This, in turn, significantly limits the achievable diameter of the product and the efficiency of drawing process. The present study, however, demonstrates that reducing the wire roughness is possible by combining the dieless and conventional drawing methods. Thus, it is possible to improve the process workability threefold when compared to dieless drawing alone, and the product quality is simultaneously improved. In addition, the surface defects typical to the dieless-drawn wires have been significantly reduced, resulting in an increase in the wire strength. This new combined technology enables a significant reduction in the wire diameter and facilitates an economical large-scale production of ultra-thin wires. In addition, based on the classic drawing and dieless drawing process, a brass wire with a diameter of 0.017 mm has been manufactured. Six times thinner than a human hair, it is believed to be the thinnest long brass wire currently manufactured in the world.

Mechanical and experimental analysis of steel wire rope during torsion

During actual operation, a steel wire rope is deformed due to stress interaction between its internal steel wires. In this article a finite element approach is employed to simulate the interaction of steel wire under practical working conditions. In addition, according to the amount of fatigue broken wire under experimental conditions, corresponding parameters are put forward to estimate the service life of steel rope. In this article, the effect of various conditions on service life of steel wire rope is analyzed, and approaches are put forward to improve its service life. The results show that the total stress in straight strand is larger than side strand stress, while the stress increases from inside to outside while increasing from inside to outside. The bigger the pulley diameter, the more steel wire breaks inside the wire rope.

Which Components of the Simple Shoulder Test Show Improvement After Scapulothoracic Fusion for Recalcitrant Scapular Winging? Clinical Results at a Minimum of 5 Years of Follow-up.

Scapular winging is an uncommon but important cause of shoulder pain and disability. Surgical management can include soft tissue procedures such as split pectoralis major transfer, the Eden-Lange procedure, or a triple tendon transfer. When these procedures do not alleviate symptomatic winging or are inappropriate, scapulothoracic fusion is an alternative, but data on its longer-term effectiveness are sparse. (1) What changes in outcome scores were observed (VAS, Single Assessment Numeric Evaluation [SANE], and Simple Shoulder Test [SST] scores), and what proportion of the patients improved by an amount larger than the minimum clinically important difference (MCID) for the outcome tool in question? (2) Which components of the SST are patients able to perform at a minimum of 5 years? (3) What complications occurred after surgery? We performed a retrospective study in a single, large, urban referral medical center of patients who underwent scapulothoracic fusion. Between January 2011 and November 2016, 15 patients underwent scapulothoracic fusion to treat symptomatic scapular winging. Only patients with nondystrophic etiology were included in the analysis (n = 13). Of the 13 remaining patients, one patient was lost to follow-up and another patient died during data collection, leaving 11 patients for the final analysis. Six patients had brachial plexus injuries affecting multiple nerve roots and periscapular muscles, and five had persistent symptoms despite prior tendon transfer. The median age of the patients was 43 years (range 20 to 67 years), and there were six male and five female patients. All patients had a minimum of 5 years of follow-up. There was a median follow-up of 79 months (range 61 to 128 months). The VAS pain score (range 0 to 10, higher scores represent more pain; MCID = 2), SST score (range 0 to 12, higher scores represent less pain and better shoulder function; MCID = 2.3), and SANE score (range 0 to 100, higher scores represent better shoulder function; MCID = 28) were recorded before surgery and at the most recent follow-up. We compared scores from before surgery with those taken at the most recent follow-up and ascertained the proportion of patients whose improvement exceeded the MCID. The number of patients achieving fusion (as confirmed by a CT image), complications, and reoperations was recorded via a record review as well as direct patient query by telephone. The median VAS pain score improved from 7 (range 3 to 10) preoperatively to 3 (range 2 to 5) at the latest follow-up (p < 0.001). The median SANE score improved from 30 (range 0 to 60) preoperatively to 65 (range 40 to 85) at the latest follow-up (p < 0.001). The median SST score improved from 0 (range 0 to 9) to 8 (range 5 to 10) at the latest follow-up (p < 0.001). Ten of 11 patients had improvements exceeding the MCID for VAS, six of 11 had improvements for SANE scores, and nine of 11 had improvements for SST. Preoperative to postoperative improvements in these components of the SST were seen (responses of "yes"): comfort at rest (three of 11 improved to 11 of 11; p < 0.001), sleep comfortably (three of 11 improved to 11 of 11; p < 0.001), place coin on shelf (two of 11 improved to 10 of 11; p < 0.001), lift 1 pound above shoulder (two of 11 improved to eight of 11; p = 0.03), and carry 20 pounds with the arm at side (one of 11 improved to nine of 11; p < 0.001). All 11 patients had successful fusion noted on CT images. There were three complications (progression of glenohumeral arthritis, broken wires, and perioperative chest tube placement) and one reoperation for progression of glenohumeral arthritis with subsequent total shoulder arthroplasty. Patients with recalcitrant symptomatic scapular winging often undergo an exhaustive course of clinical examinations, diagnostic tests, physical therapy, and multiple surgical procedures. Those with brachial plexus palsy with involvement of multiple nerves may continue to have symptoms despite nonoperative management and subsequent soft tissue tendon transfers. Scapulothoracic fusion could be considered for patients with persistent pain and decreased function because of recalcitrant scapular winging who are either not candidates for the procedure or have persistent symptoms despite prior soft tissue procedures. Level IV, therapeutic study.

Some Stochastic Aspects of Safety Work of Steel Wire Ropes Used in Mining-Shaft Hoists

In most rope transport devices, the used steel wire ropes are replaced with new ones after working for a certain period of time, or after reaching the acceptable level of wear. The operational safety of the entire system depends on the correct diagnosis of the condition of the working wire rope. This is not easy, because the working lives of the ropes are varied, and their wear depends on many factors, including random ones. This article presents three different aspects of the work of steel ropes in mining-shaft hoists. What they have in common is a stochastic approach to interpreting the level of rope wear. The process of progressive wear due to fatigue breaking of wires is presented as the first example. This process is non-linear with a strong upward trend, which, in the final stage, turns into a phase often referred to as “explosive”. The rate at which subsequent wire breaks appear is influenced by numerous random factors, e.g., in the form of different methods and materials from which a given rope is constructed. However, the character of the progressing wear process is most affected by the random distribution of stresses experienced by individual wires and the randomly variable nature of the working environment. The second aspect presented in this article is an attempt to determine the probability of wire breaks of the rope. This was presented on the example of wear of the hoisting rope of a mining-shaft hoist. The last aspect of a stochastic nature, which is discussed in the article, is the issue of separating individual components of this distribution from the multimodal distribution describing the tensile strength of the rope wires, possibly of a normal character. Modern methods of analysis allow such distributions to be assigned to specific structural elements of the wire rope. This gives information about which structural elements of the rope wear faster or unusually and, consequently, determine its strength. This was presented on the basis of the results of strength tests of the wires of the mining-shaft hoist rope, which broke due to excessive corrosion wear of the inner strands. The presented examples explain only a short part of randomness in the description of working ropes, but the intention of the authors is to draw the attention of the personnel responsible for their safe operation to unavoidable random factors.

Investigation of Situational Correlations of Wire Electrical Discharge Machining of Superhard Materials with Acoustic Emission Characteristics

The purpose of this research is to find relationships between the parameters of the acoustic emission signals accompanying the electroerosive processing with a wire electrode of metals and hard alloys and the most important process indicators. These indicators include an increase in the concentration of erosion products in the interelectrode gap, an increase in the probability of wire electrode breakage, the efficiency of the supplied energy, the current productivity. This article presents the results of the study of acoustic emission signals during the processing of hard alloys with a cutting machine. The main focus is on the period preceding the breakage of the wire electrode. Changes in the parameters of acoustic emission a few seconds before failure are shown, and the possibility of preventing wire breakage by monitoring the parameters of acoustic emission signals is established. To evaluate the efficiency of the energy supplied to the processing zone, a dynamic model is proposed, with the help of which the processing efficiency is estimated by changing the transmission coefficients in one or several frequency ranges. To explain the situation that occurs in the processing zone with an increase in the concentration of erosion products, the article draws a parallel between electroerosive and laser processing, related to technologies of processing with concentrated flows of energy. Studies have shown that acoustic emission signals can be used to search for rational processing modes and improve automatic control systems for electroerosive equipment.

Proposal of a Bioinspired Patch for the Real-time Monitoring of Neurological Trauma

Neurological trauma, damage to the brain, spine, or nerves, can happen as a result of both neurosurgery and vehicle accidents. It may be risky to cause damage during surgery because of humans' ineffective capacity to repair neurons; as a result, the market may require a medical device specifically made to address this problem. The accessory limb model (ALM), one of the most typical regeneration models, has demonstrated that it has significant potential to improve regeneration outcomes and might be used for the regeneration of human brain tissues. Nowadays, many implanted medical devices interact with circuitry outside the body via cables or wireless RF telemetry. However, wires usually result in a huge chance to increase surgical difficulties such as wire breakage, infection, and electrical noise. Intrabody communication, as a result, became a preferable and safer way of communication in the design of implantable medical devices, and is used in the device introduced in this article.

Simulation analysis and experimental investigation of wire rope leakage magnetic field detection

As a key bearing component, steel wire ropes suffer from partial wire breakage, broken strands and other types of damage during long-term continuous use. In this study, a magnetic flux circuit was constructed around a wire rope, an excitation detection device and an air gap. The relationship between the direction and angle of the magnetic line of force on the damaged end face was analysed and the waveforms of the inverted U-shaped and M-shaped leakage flux signals and their transition intervals were determined. Following this, focusing on the influence of factors such as the length of the damage, the cross-sectional area and the lift-off value on the magnetic flux leakage signal, the changes in the wave width and the peak value under different variables were analysed and the distribution law of the leakage magnetic field around the wire rope damage under different control variables was determined.

Hybrid Tension Band Wiring for Olecranon Fractures.

Tension band wiring (TBW) is a standard surgical technique for treating olecranon fractures (OFs). We devised a hybrid TBW (HTBW) combining TBW using wires with eyelets and cerclage wiring. Twenty-six patients with isolated OFs with Colton classification groups 1-2C were subjected to HTBW, and the data was compared with those treated with conventional TBW (38 patients). The mean operation time and hardware removal rate were 51 versus 67 minutes (p < 0.001) and 42% versus 74% (p < 0.012), respectively. The HTBW group had one patient (4%) with surgical wire breakage. The conventional TBW group had 14 patients (37%) with symptomatic backout of Kirschner wires, three patients (8%) with loss of reduction, two patients (5%) with surgical site infection and one patient (3%) with ulnar nerve palsy. The motion and functional score ranges of the elbow were not significantly different. Therefore, this procedure may be a feasible alternative. Level of Evidence: Level V (Therapeutic).

EMPIRICAL STUDIES OF EMERGENCY MODE PARAMETERS AND THEIR INTERACTION IN DETERMINING THE FAULT LOCATION IN NETWORKS WITH AN ISOLATED NEUTRAL VOLTAGE OF 6(10) - 35 KV

"This article considers experimental confirmation of quantitative characteristics of factors influencing the determination of the distance to the fault location in networks with an isolated neutral voltage of 6(10)-35 kV. Experiments were carried out on a 35 kV overhead power line, the selection of optimality criteria was provided, a mathematical model, an experimental plan, a method for analyzing measurement data to damage detection devices were developed, response surfaces were constructed in the Mathcad 14 program in the Pro/ENGINEER package. According to the results of the experiment on the parameters of the emergency mode, it was found out that the largest influencing factor is the value of the transient resistance at the point of wire breakage of a non-metallic earth fault. It is proved that with a transient resistance above the value of 50 ohms, the distance to the damage site is almost impossible to determine with remote devices that register the parameters of the emergency mode. Recommendations for the development of a mathematical model with the production of logical operations on fuzzy sets of an adaptive neuro-fuzzy system are formulated. It is proposed to apply the mathematical model developed in the future as a basis for designing the element base of the device for determining the location of damage, working on the principle of artificial intelligence with an adaptive nature of measurements under changing external conditions. Key words: experiment, single-phase ground fault, fault location, overhead power line, isolated neutral, contact resistance, network isolation. "