Adhesion Zone Research Articles

The traction behaviour of high-speed train under low adhesion condition

To clarify the train-track traction behaviour in the low adhesion zone, a three-dimensional (3D) train-track coupling dynamic model was developed, in which the train was modelled as a rigid multi-body system with 8 vehicles. The vehicles are connected through coupler devices, which are simplified as nonlinear springs and dampers. The modified FASTSIM algorithm is utilized to obtain the wheel/rail creep force, which can consider the interfacial conditions. A new anti-slip control algorithm was proposed where the traction power could be adjusted to ensure the maximum utilization of wheel/rail adhesion. This control algorithm is achieved by iterating among the traction power, rotational speed and rotational acceleration of each wheelset. Numerical simulation results showed that the traction force would be reduced to a certain level to achieve maximum admissible force when the anti-slip control algorithm is activated. The rotational speed, traction force, creep force, creepages, and coupler force in contaminated conditions were investigated. The results show that the model can effectively simulate the traction process under the low adhesion state, which provides a certain theoretical reference for railway applications.

An experimental evaluation on the dynamic response of water aged composite/aluminium adhesive joints: Influence of electrospun nanofibers interleaving

The impact response of adhesives is a critical design parameter considering their lifetime. Additionally, environmental effects such as water or moisture may cause to degrade of the polymer-based adhesive and shorten its service life. This study aimed to investigate the impact response of water-aged aluminium-composite adhesively bonded single lap joints (SLJs). Nylon 6.6 nanofibers modified with graphene nanoplatelets (GNPs) were introduced in the adhesion areas to increase adhesive performance. The water aging resulted in decreased impact resistance in all cases. However, nanofiber-modified SLJs exhibited comparatively higher impact performance under both non-aged and water-aged conditions. Further, the GNP reinforced nylon 6.6 nanofibers increased the maximum impact load by 15 and 19% compared to neat nanofibers before and after aging, respectively. The fracture surfaces were examined via scanning electron microscopy (SEM) to understand damage and toughness mechanisms. A schematic model has been developed to explain the mechanisms leading to improved bonding performance by applying N6.6 nanofiber reinforcement to the adhesion zone.

Strain rate effects on the thermomechanical behavior of glass/polyester composite joints

AbstractFor several decades, composite materials have been used in different applications due to their multiple advantages. It has become necessary to understand the dynamic behavior of these materials under critical loads. In‐plane (IP) and out‐of‐plane (OP) dynamic compression tests were investigated on a cubic specimen of composite joints under low to high strain rates using the Split Hopkinson Pressure Bars (SHPB) technique. The specimens consist of two adherents (glass/polyester composite) assembled by an adhesive with different thicknesses (1 and 2 mm). During the experimental tests, the high‐speed camera was used to check the damage history and the failure mechanisms on adhesively bonded composite joints. The sample surface temperatures were monitored using an infrared camera (IR). For bonding of two composite substrates, it can be noted that the thickness of the adhesive has a significant effect on the dynamic behavior and the kinetics of the damage. It has been concluded that the damage was localized at the level of the layers in the case of in‐plane loading and the level of the adhesive zone in the case of out‐of‐plane loading. The thermomechanical behavior of cubic specimens of adhesively bonded joints subjected to dynamic compression has been studied. The results underline the sensitivity of the dynamic behavior of the adhesively bonded joints to the strain rate, the loading direction and the appearance of heat dissipation linked to the increase in temperature following the initiation of damage. This rise of temperature can dangerously approach the glass transition temperature of the matrix.

Resin bond strength to translucent zirconia: A 2-year follow-up

The aim of this study is to evaluate the effect of aging on resin bond strength to translucent zirconia treated with the most clinically used bonding procedures. Monolithic translucent zirconia-based ceramic (3Y-TZP) blocks were surface treated using airborne-particle abrasion with alumina particles (AP) or silica-coated alumina particles (SC) then bonded to resin composite blocks using a resin cement system containing a silane coupling agent and an adhesive with a phosphate (MDP) monomer. Bar-shaped specimens (bonding area: 1 mm 2 ) were fabricated (n = 30) and stored in 37 °C distilled water for the following time before testing: 7 days (SCI and API); 1 year (SC1 and AP1); and 2 years (SC2 and AP2). Specimens were loaded to failure under tension using an Instron testing machine. Microtensile bond strength (σ f ) data was statistically analyzed using Weibull distribution, analysis of variance (ANOVA) and Tukey tests (α = 0.05). Failures were evaluated using fractographic principles. Mean σ f values significantly decreased after 2 years of water storage (SC2 and AP2) (p < 0.05), although there was no difference in the Weibull modulus. All specimens failed cohesively within the adhesion zone at the zirconia-cement adhesive interface.

Anatomy behind the Paramedian Platysmal Band: A Combined Cadaveric and Computed Tomographic Study.

The muscular hypothesis explanation of the pathophysiology behind paramedian platysmal bands does not seem to provide a sufficient explanation for the clinical presentation of these platysmal bands in aged individuals with cervical soft-tissue laxity. The purpose of this study was to investigate the fascial relationships of the anterior neck to enhance appropriate surgical treatment. Retrospective analysis of computed tomographic scans of 50 Caucasian individuals (mean age, 55.84 ± 17.5 years) and anatomical dissections of 20 Caucasian and 10 Asian body donors (mean age, 75.88 ± 10.6 years) were conducted. Fascial adhesions were classified according to platysma fusion types, and platysma mobility was tested during dissection procedures. Fusion between the left and right platysma muscles occurred in 64 percent in the suprahyoid region and in 20 percent at the thyroid cartilage, and in 16 percent, the platysma attached to the mandible without fusion. In the absence of muscular fibers, a fascial adhesion zone with limited mobility was observed where the superficial cervical fascia fused with the investing layer of the deep cervical fascia. Muscular contraction of the platysma results in elevation of the most medial platysma muscle fibers, which are not attached in the fascial adhesion zone. The presence of a fatty layer deep to the platysma enables platysmal movement and anterior and inferior gliding of the skin and platysma when cervical soft-tissue laxity exists. Surgical treatments should include transection of the fascial adhesion; this could potentially prevent the recurrence of paramedian platysmal bands.

The co‐effect of microstructures and mucus on the adhesion of abalone from a mechanical perspective

Reliable and reversible adhesion underwater is challenging due to the water molecules and weak layers of contaminants at the contact interface, which requires to deepen the understanding of wet adhesion of biological surfaces. Herein, the co-effect of microstructures and mucus of abalone foot on wet adhesion is investigated from both experimental and theoretical perspectives. The morphologies, adhesion force and coefficient of friction indicate that the mucus in adhesion zone is crucial for successful attachment of abalone based on capillary forces and viscous forces, and the mucus in non-adhesion zone with lower adhesion force and friction coefficient may behave as a lubricant for the locomotion. The theoretical calculation manifests that the microstructures may help abalone to form multiple liquid bridges with the secreted mucus, and significantly increase the wet adhesion force of abalone. These findings will bring profound views into the underlying mechanisms of biological surface adhesion.

Влияние локализации витреоретинального сращения на конфигурацию клапанного разрыва и вероятность развития регматогенной отслойки сетчатки

Purpose. To evaluate the relationship between the shape of horseshoe tear and the localization of vitreoretinal tractions (VRT) using methods of the peripheral vitreoretinal interface visualization and classify horseshoe tears by shape for surgical planning. Material and methods. We studied horseshoe tears parameters of 52 patients (52 eyes). The localization of VRT was determined by wide-field OCT, the horseshoe tear shape was determined as the ratio of length to width of the tear (l/b) by multispectral laser scanning. The ratio of the obtained data was evaluated by the Spearman correlation analysis. We used Ward's method of hierarchical clustering to classify the horseshoe tears by shape. The obtained data were used to perform YAG- laser excision of the vitreoretinal adhesion zone in patients with rhegmatogenous retinal detachment as part of the combined microinvasive laser-surgical technology. Results. The l/b ratio ranged from 1/4 to 3/1. A strong negative correlation has been revealed between the horseshoe tear shape and the fixation of vitreoretinal tractions (rs -0.95; p &lt;0.05). Horseshoe tears were identified in 4 groups using Ward's method of clustering. Each group corresponded to a specific localization of VRT. The extension of VRT beyond the tear was associated with a high risk of rhegmatogenous retinal detachment. Conclusion. A significant correlation has been found between the studied factors confirm the possibility of using data on the horseshoe tear shape for an approximate evaluation of vitreoretinal adhesion localization. The obtained data allows to determine the exact VRT excision zone when performing combined laser-surgical technology without the need for preoperative wide-field OCT. Key words: rhegmatogenous retinal detachment, wide-field OCT, horseshoe tear, vitreoretinal traction, YAG – laser retinotomy.

The Influence of Background Ultrasonic Field on the Strength of Adhesive Zones under Dynamic Impact Loads.

The influence of background ultrasonic field on the ultimate dynamic strength of adhesive joints is studied using fracture mechanics analysis. Winkler foundation-type models are applied to describe the cohesion zone, and the incubation time fracture criterion is used. The challenging task is to study whether relatively weak ultrasound is able to decrease the threshold values of the external impact load depending on a joint model, such as an “elastic membrane” or “beam” approximation, and various boundary conditions at the ends. The specific task was to investigate the case of short pulse loading through application of time-dependent fracture criterion instead of the conventional principle of critical stress. Three different load cases, namely, step constant force, dynamic pulse, and their combination with ultrasonic vibrations, were also studied. The analytical solution to the problem demonstrates that background vibrations at certain frequencies can significantly decrease threshold values of fracture impact load. Specific calculations indicate that even a weak background sonic field is enough to cause a significant reduction in the threshold amplitude of a dynamic short pulse load. Additionally, non-monotonic dependency of threshold amplitude on pulse duration for weak background field was observed, which demonstrates the existence of optimal regimes of impact energy input. Moreover, this phenomenon does not depend on the way in which the beam edges mount, whether they are clamped or hinged, and it could be applied for micro-electro-mechanical switch design processes as an additional tool to control operational regimes.

Напряженное состояние в контакте колеса и рельса при наличии скольжения и сцепления

Objective: Predicting the stress-strain state of a wheel or rail during their interaction depending on the normal pressure. Methods: The study of the stress-strain state in the car wheel and in its contact with the rail using the finite element method with all possible combinations of loading factors and taking into account the influence of temperature, dynamic influences, contact parameters, fatigue phenomena and the forces of interaction between the wheel and the rail are calculated, determining the stress state of the wheel, wear and deterioration of the contact surfaces and, as a consequence, the reliability of the carriage and traffic safety. Results: The effect of tangential loads on the stress-strain state when there is sliding in the wheel-rail contact zone was evaluated. The parameters of dangerous stresses are given depending on the axial load. Experimental and theoretical approaches to determining the stress-strain state of contacting elements in the presence of both slip and adhesion in the wheel-rail contact are shown. The components of the stress tensor are obtained depending on the contact pressure according to the calculation formulas. Diagrams of the distribution of shear stresses in the contact of the wheel with the rail in the presence of a zone of adhesion and sliding are made. The intensity of the stress state change in the wheel-rail contact is calculated. Practical importance: The results obtained show how the slip and adhesion zones affect the stress state in the contact zone in comparison with full slip. They are useful from the point of view of predicting the stress-strain state of a wheel or rail during their interaction depending on the normal pressure.

Gas‐Lubricated Vibration‐Based Adhesion for Robotics

Controllable adhesion has the capability to enable mobile robots to move freely across vertical and inverted surfaces for applications such as inspection, exploration, and cleaning. Previous methods for generating controllable adhesion have relied on fluidic adhesion through suction forces, electromagnetic adhesion through magnetic or electrical interactions, or dry fibrillar structures. Herein, a new method for achieving controllable adhesion by vibrating a flexible plate near a surface, which generates a strong and controllable attraction force, is presented. This adhesion mechanism has the unique property of providing strong adhesion normal to a surface, but very low resistance to motion parallel to the surface, making it attractive for mobile robots. Adhesive capabilities of vibration‐based adhesion (VBA) to characterize adhesive force dependence on vibration frequency and surface size are studied. Spatial pressure measurements within the adhesive zone, in combination with visualization of surface vibration modes, demonstrate that adhesion is localized to the center of the disk and decreases radially. A mobile robot to highlight the capabilities and robustness of VBA for payload transport, climbing to inversion transitions, and adhesion control is developed. Overall, a novel physical mechanism for robot‐surface adhesion that is robust, controllable, and enables rapid low‐friction locomotion is presented herein.

Surface Testing of Dental Biomaterials-Determination of Contact Angle and Surface Free Energy.

The key goal of this study was to characterize surface properties of chosen dental materials on the base on the contact angle measurements and surface free energy calculations. Tested materials were incubated in the simulated oral environment and drinks to estimate an influence of conditions similar to those in the oral cavity on wetting and energetic state of the surface. Types of materials were as follows: denture acrylic resins, composite and PET-G dental retainer to compare basic materials used in a prosthetics, restorative dentistry and orthodontics. The sessile drop method was used to measure the contact angle with the use of several liquids. Values of the surface free energies were estimated based on the Owens–Wendt, van Oss–Chaudhury–Good and Zisman’s methods. The research showed that surface wetting depends on the material composition and storage conditions. The most significance changes of CA were observed for acrylic resins (84.7° ± 3.8° to 65.5° ± 3.5°) and composites (58.8° ± 4.1° to 49.1° ± 5.7°) stored in orange juice, and for retainers (81.9° ± 1.8° to 99.6° ± 4.5°) incubated in the saline solution. An analysis of the critical surface energy showed that acrylic materials are in the zone of good adhesion (values above 40 mJ/m2), while BIS-GMA composites are in the zone of poor adhesion (values below 30 mJ/m2). Study of the surface energy of different dental materials may contribute to the development of the thermodynamic model of bacterial adhesion, based on the surface free energies, and accelerate the investigation of biomaterial interaction in the biological environment.

Experimental investigation of Cu-SS electromagnetically assisted adhesive tube-to-tube joining: Its advantages over electromagnetic crimping

Electromagnetically assisted adhesive joining (EAAJ) is a novel hybrid joining technique combining the benefits of electromagnetic crimping and adhesive joining. This paper explores the possibility of creating an interference-fit tubular adhesive joint with improved strength and leak tightness. An acrylic-based structural Loctite 638 adhesive is used. Experiments are performed with and without (electromagnetic crimping) adhesives. Pull-out and compression test is performed for both joining techniques which has confirmed a significant improvement in joint strength with adhesives. A two-factor ANOVA analysis is also performed to calculate the contribution of adhesives and discharge energy over pull-out and compressive strength of the joint. An air leak testing setup is developed to investigate the leak tightness of the Cu-SS tube-to-tube Joint. Leak tightness is observed to be increased by ten times in the case of EAAJ compared to EMC. Macrographs have revealed no metallic bond formation. Deformation analysis is also performed to study the various zones of the samples. Micro-hardness is observed to be decreased for the adhesive joint in the adhesive zone.

Defining a Safe Corridor of Cervical Branch Preservation in Lateral Platysmaplasty Surgery During Facial Rejuvenation Surgery.

During rhytidectomies, the cervical branch of the facial nerve (CBFN) can easily be encountered, and potentially injured, when releasing the cervical retaining ligaments in the lateral neck. This nerve has been shown to occasionally co-innervate the depressor anguli oris muscle, and damage to it can thus potentially compromise outcomes with a postoperative palsy. The authors sought to examine the lateral cervical anatomy specific to the CBFN to ascertain if the position of the nerve can be predicted, thereby enhancing safety of the platysmal flap separation and dissection from this lateral zone of adhesion. Eleven cadaveric hemifaces were dissected, and the distance between the medial border of sternocleidomastoid muscle (SCM) and the CBFN was measured at 3 key points: (1) superior: the distance between the SCM and the nerve at the level of the angle of the mandible in neutral; (2) narrowest: the narrowest distance measurable between the superior and inferior points as the CBFN descends into the neck medial to the SCM; and (3) inferior: the distance at the most distal part of the cervical nerve identified before its final intramuscular course. The average distances (in mms) were as follows: superior = 12.1 (range, 10.1-15.4), narrowest = 8.8 (range, 5.6-12.2), and inferior = 10.9 (range, 7.9-16.7). There is a narrow range between the nerve and the anterior border of SCM. We thus propose a safe corridor where lateral deep-plane dissection can be performed to offer cervical retaining ligament release, with reduced risk of endangering the CBFN.

Displacement field measurements in traditional and rotational diamond anvil cells

A digital image correlation-based method has been developed to measure the displacement field during compression in a traditional diamond anvil cell (DAC) and torsion in rotational DAC (RDAC) employing ruby fluorescence microscopy imaging. The optical arrangements for these measurements are adaptable at any commercial or customized micro-confocal system used for in situ high-pressure Raman or ruby fluorescence spectroscopy. In this paper, we describe details of the setup developed at Iowa State University along with a few demonstrative measurements for a zirconium sample. In particular, under compression in DAC, no adhesion zone is found, and relative sliding increases almost linearly along the radius. During torsion in RDAC, actual angular displacement of the material is found to be 5 times smaller than the rotation angle of an anvil, which is routinely used in the definition of the plastic shear for the determination of stress–strain curves and plastic strain-induced kinetics of phase transformations and grain refinement in materials. Obtained displacements can be used as the boundary conditions for finite element method (FEM) simulations of processes in DAC and RDAC instead of hypothetical friction conditions. After iterative fitting of FEM simulations and all measured fields from x-ray diffraction and absorption experiments, this will allow us to more precisely determine contact friction conditions and material parameters in the constitutive equations for elastoplastic flow and strain-induced phase transformations.

Microstructure evolution of Al-Si-Fe alloy during spray Conform

The microstructure evolution of Al-20Si-5Fe alloy during spray Conform (SC) was investigated. Results show that the fracture of the intermetallic phase and Si phase occurs in the deposited billet and adhesive zone and crushed heavily in adhesive zone. Fine intermetallic phases are formed between the adhesive zone and the extrusion zone. Both coarse and fine grains exist in the extrusion rod. Compared with the deposited billet, the size of intermetallic phase and Si phase in the extrusion rod decreases. Furthermore, the transition from complete to incomplete wetting occurs in the SC process.

Properties of TiN–Al2O3–TiCN–TiN, TiAlN, and DLC‐coated Ti(C,N)‐based cermets and their wear behaviors during dry cutting of 7075 aluminum alloys

AbstractIn the work, TiAlN for physical vapor deposition (PVD), multilayer TiN‐Al2O3‐TiCN‐TiN for chemical vapor deposition (CVD), and diamond‐like carbon (DLC) for plasma‐enhanced chemical vapor deposition (PECVD) were deposited on the cermet inserts. Characteristics and wear behaviors of the three coated cermets during dry cutting of 7075 aluminum alloys were observed. The results show that TiN‐Al2O3‐TiCN‐TiN coatings have highest adhesion strength and hardness. At the cutting speed of 1100 r/min, the depth of 0.2 mm, and the feed rate of 0.1 mm/r, the three coated inserts show the best wear‐resistant properties. In this case, TiN/Al2O3/TiCN/TiN shows the worst wear‐resistant properties (value of the flank wear [VBB] = 0.062 mm), while DLC coatings show the most excellent wear‐resistant properties (VBB = 0.046 mm). During the cutting of aluminum alloys, which have high plasticity and low melting point, adhesive wear dominate on the flank of the inserts. The thickest coating of TiN/Al2O3/TiCN/TiN results in the bluntest cutting edge, which form the most serious adhesive worn zone. For the TiAlN and DLC coatings, due to a smaller cutting force, the two coatings have much better wear resistance. Further, the self‐lubricating properties of DLC show excellent effect on protecting the inserts. Thus, the DLC‐coated cermets have the best wear‐resistant properties. Further, the TiAlN‐coated cermets have the widest wear‐affected zone while the DLC coating has the narrowest.

Adhesion and friction in hard and soft contacts: theory and experiment

This paper is devoted to an analytical, numerical, and experimental analysis of adhesive contacts subjected to tangential motion. In particular, it addresses the phenomenon of instable, jerky movement of the boundary of the adhesive contact zone and its dependence on the surface roughness. We argue that the “adhesion instabilities” with instable movements of the contact boundary cause energy dissipation similarly to the elastic instabilities mechanism. This leads to different effective works of adhesion when the contact area expands and contracts. This effect is interpreted in terms of “friction” to the movement of the contact boundary. We consider two main contributions to friction: (a) boundary line contribution and (b) area contribution. In normal and rolling contacts, the only contribution is due to the boundary friction, while in sliding both contributions may be present. The boundary contribution prevails in very small, smooth, and hard contacts (as e.g., diamond-like-carbon (DLC) coatings), while the area contribution is prevailing in large soft contacts. Simulations suggest that the friction due to adhesion instabilities is governed by “Johnson parameter”. Experiments suggest that for soft bodies like rubber, the stresses in the contact area can be characterized by a constant critical value. Experiments were carried out using a setup allowing for observing the contact area with a camera placed under a soft transparent rubber layer. Soft contacts show a great variety of instabilities when sliding with low velocity — depending on the indentation depth and the shape of the contacting bodies. These instabilities can be classified as “microscopic” caused by the roughness or chemical inhomogeneity of the surfaces and “macroscopic” which appear also in smooth contacts. The latter may be related to interface waves which are observed in large contacts or at small indentation depths. Numerical simulations were performed using the Boundary Element Method (BEM).

Numerical simulation of the viral entry into a cell driven by receptor diffusion

The present study focuses on the receptor driven endocytosis typical of viral entry into a cell. A locally increased density of receptors at the time of contact between the cell and the virus is necessary in this case. The virus is considered as a substrate with fixed receptors on its surface, whereas the receptors of the host cell are free to move over its membrane, allowing a local change in their concentration. In the contact zone the membrane inflects and forms an envelope around the virus. The created vesicle imports its cargo into the cell. This paper assumes the diffusion equation accompanied by boundary conditions requiring the conservation of binders to describe the process. Moreover, it introduces a condition defining the energy balance at the front of the adhesion zone. The latter yields the upper limit for the size of virus which can be engulfed by the cell membrane. The described moving boundary problem in terms of the binder density and the velocity of the adhesion front is well posed and numerically solved by using the finite difference method. The illustrative examples have been chosen to show the influence of the process parameters on the initiation and the duration of the process.

Friction stir spot welding of 5052 aluminum alloy to carbon fiber reinforced polyether ether ketone composites

The hybrid structure composed of aluminum alloy and carbon fiber reinforced plastics could combine their advantages. In order to investigate the weldability of these two lightweight materials, the hybrid joints of 5052 aluminum alloy (AA5052) and carbon fiber reinforced polyether ether ketone composites (CF-PEEK) were fabricated by friction stir spot welding. The variance analysis revealed that the dwell time and plunge speed were the most significant factors. By optimizing the welding parameters, the ultimate tensile shear load reached 2690±64 N (the dwell time: 8 s, the plunge speed: 10 mm/min). The interface could be divided into pin-affected zone, shoulder-affected zone, resin adhesive zone and resin concentrated zone. Since resin concentrated zone could not provide interfacial bonding due to delamination, the shoulder-affected zone and pin-affected zone were decisive regions for mechanical properties. The bonding mechanism included three parts: adhesive bonding provided by re-solidified resin, macro-mechanical interlocking of aluminum alloy that entered CF-PEEK, and micro-mechanical interlocking of resin that was tightly trapped at surface slits as well as the carbon fibers beset into AA5052. This work clarifies the interfacial characteristics of AA5052/CF-PEEK hybrid joints and provides an approach to improve the mechanical properties.

Анализ отдаленных результатов применения технологии комбинированного микроинвазивного лазер-хирургического лечения локальной регматогенной отслойки сетчатки

Aim: to evaluate the long-term clinical efficacy of the combined (laser plus surgical) minimally invasive technique for rhegmatogenous retinal detachment (RRD). Patients and Methods: treatment results of 41 patients (41 eyes) with local RRD resulting from horseshoe retinal tear were analyzed. All patients underwent wide-field optical coherence tomography (OCT) to localize and measure pathological vitreoretinal adhesions at the site of retinal tear. The next step was a combined laser surgical procedure that included Nd: YAG dissection of pathological vitreoretinal adhesion zone, pneumatic retinopexy (10% C3F8), and barrier laser retinal photocoagulation (LRP) after reattachment. Postoperatively, eye exams were performed after 3 and 7 days, 3, 6, 12, 18, and 24 months. Results: complete reattachment was achieved in 38 patients (92.7%) on day 2 or 3. No reattachment was seen in three patients (7.3%); of them, subretinal gas migration was observed in two patients (4.9%), and partial reattachment was detected in one patient (2.4%) with pseudophakia. Recurrent RRD occurred in 3 patients (7.9%) because of new inferior retinal breaks. In four patients (10.5%), postoperative wide-field OCT of the area of the initial retinal tear performed after reattachment revealed additional pathological vitreoretinal adhesions in the adjacent areas (that were not identified preoperatively). These patients underwent additional LRP around the areas of pathological vitreoretinal adhesions. No recurrent RRDs were seen during follow-up. Conclusion: combined minimally invasive laser surgical technique for local PPDs demonstrated high efficacy (92.7%). This technique was the effective in local retinal detachment resulting from a single superior horseshoe retinal tear in patients with crystalline lens. In some cases, pseudophakia is a technical obstacle to this procedure. Postoperative wide-field OCT is recommended to detect additional pathological vitreoretinal adhesions and to perform LRP around them to reduce the risks of recurrent RRDs greatly. Keywords: rhegmatogenous retinal detachment, optical coherence tomography, Nd: YAG laser retinotomy, vitreoretinal traction. For citation: Doga A.V., Shkvorchenko D.O., Kryl L.A. et al. Long-term outcomes combined minimally invasive laser surgical technique for local rhegmatogenous retinal detachment. Russian Journal of Clinical Ophthalmology. 2021;21(2):63–68. DOI: 10.32364/2311-7729-2021-21-2-63-68.