Maximum Shear Force Research Articles

Live load effects in hammer-head piers of continuous highway bridges and design equations based on numerical simulations verified by field tests

In this study, design equations are proposed to calculate the internal forces in hammer-head bridge pier components under the effect of live loads. For this purpose, first, the finite element model (FEM) of an existing bridge is built and the modeling approach is verified against field test results. Next, a four-span benchmark bridge representative of the bridges in the US is selected. FEM of the benchmark bridge is built, and sensitivity analyses are performed on the bridge model to identify the bridge parameters affecting the magnitude and distribution of the girder live load support reactions and hence the internal forces in the hammer-head pier components. The sensitivity analyses revealed that the number of girders, girder spacing, girder type, slab thickness and the overhang distance significantly affect the magnitude and distribution of the girder live load support reactions and hence the forces in hammer-head pier components. Then, parametric analyses of bridges are performed based on the sensitivity analyses results where each parameter is assigned a wide range of values. Subsequently, minimum least squares regression analyses of more than 50,000 data are performed to obtain equations to estimate the maximum cap beam moment and shear force, the maximum column moment and accompanying axial load as well as the maximum column axial load and accompanying moment. The hammer-head pier forces calculated using the design equations are shown to be in reasonably good agreement with FEM analyses results.

Design and Experimental Study of a Bionic Blade for Harvesting the Wild Chrysanthemum Stem

Wild chrysanthemum has a high medicinal value. Its mechanized harvest can improve harvesting efficiency, reduce labor costs and improve planting benefits, which is an important way to promote artificial planting. However, one of the difficulties in mechanized harvesting is the large diameter and hardness of the stem, leading to high cutting resistance and power consumption. In order to reduce cutting resistance and power consumption, a bionic cutting blade is designed in this paper by employing the bionics principle and the contour of the cricket’s upper jaw incisor lobe instead of the sharp triangular teeth of the standard harvester blade. Using the finite element method, the cutting-edge angle, cutting angle, and reciprocating speed were taken as test factors. The maximum shear force and power consumption were taken as evaluation indexes. At the same time, the center combination simulation test was carried out to optimize the cutting body and to determine the optimal cutting speed. When the cutting-edge angle was 21°, the cutting angle was 66°, the reciprocating speed was 1.29 m/s, and the maximum shear force and power consumption were minimal. The results showed that the maximum shear force of the bionic cutter was reduced by 18% and the power consumption by 15.8%. The bench test showed that the maximum shear force and power consumption of the bionic cutter were reduced by 10.5% and 10.8%, respectively, when the entire wild chrysanthemum stem was cut. The results can provide a reference for the mechanical harvesting of wild chrysanthemum stems.

Shear ground reaction force variation among equine arena surfaces.

Shear forces at the surface-hoof interface affect hoof slide, surface grip, forces transferred to the limb, and injury risk. However, the variation in shear forces among surfaces with different compositions have not been quantified. Shear ground reaction forces were measured on five dirt and seven synthetic arena surfaces. Cohesion/adhesion and angle of internal friction/coefficient of friction were calculated. Surface composition, surface temperature, cushion depth, and moisture content were also measured. The effects of surface material (dirt/synthetic) on shear properties were assessed using analysis of variance (ANOVA; P<0.05). The relationships between surface composition or management properties and shear properties were analyzed using linear correlation. Shear properties were not different between dirt and synthetic surface categories; however, surface fiber content was correlated with adhesion and coefficient of friction. These correlations predict that more fiber will decrease soil adhesion (r=-0.75; P<0.01) and increase the coefficient of friction (r=0.81; P<0.01). Furthermore, maximum shear force was significantly correlated with cushion depth (r=0.61; P<0.01) and moisture content (r=0.57; P<0.01), where shear force was greater on surfaces with thicker cushion layers or higher moisture content. The findings suggest that shear mechanical behavior is more dependent on surface composition than surface material categories (dirt/synthetic) and also indicate that arena owners can influence shear forces by adjusting either surface composition or management.

A Numerical Investigation to Calculate Ultimate Limit State Capacity of Cable Bolts Subjected to Impact Loading

As rock bursts are unavoidable in deep mines and excavations with high in-situ stresses, ground support systems are implemented to manage and mitigate rock bursts. Cable bolts are commonly used as reinforcing elements in ground support systems, which are subject to dynamic loads in burst-prone excavations. To design an efficient cable bolt in burst-prone conditions, shear and energy absorption capacity must be considered. Numerical modelling is an advantageous method of repeatable testing and it is inexpensive and non-destructive. This study develops a statically and dynamically loaded numerical model of a double shear test in ABAQUS/Explicit. A total of 36 static and 576 dynamic tests are carried out, which examine the influence of bolt diameter, steel yield and ultimate strength, dynamic load velocity and dynamic load mass on the displacement, shear force and energy absorption capacity of cable bolts. As bolt diameter and steel yield strength increases, the maximum shear force resisted and bolt displacement increases. Similarly, as the mass and velocity of the dynamic load increases, the amount of energy absorbed by the cable bolt increases. The main novelty of the current research is to suggest a reliable computational tool to investigate the influence of the different key parameters in the cable bolts on the ultimate capacity. The suggested method is a significantly cost-effective technique compared with the experimental investigations.

Finite Element Analysis of Bridge Deck Using MATLAB

Bridges are the most common types of structures generally adopted when there is a obstacle in the path such as water body, valley, road etc without closing the way underneath. Moving live load is one of the critical loading for which bridge superstructure need to be analysed by developing model as realistic as possible. Even though various conventional methods are present for the analysis of bridge superstructure but finite element analysis gives us more realistic behavior of structure. The objective of the thesis is to develop a finite element model of T-beam slab bridge ,bridge pier and pier footing and analyse to study behavior of bridge superstructure for moving live load as per Indian road congress standards given in IRC:6-2017 and IRC: 112-2011 and the dead load of the structure. In my work, bridge deck is modelled as Mindlin-Reissner plate element which is two dimensional plate in which shear deformations effect is considered whereas longitudinal girders ,cross girders and diaphragms are modelled using Euler-Bernoulli’s grid element which are a one dimensional element . A MATLAB code is developed to model T-beam slab composite action in which beam elements is modelled in plane of plate element so that the nodes of beams are coincide to the nodes of the plate by doing such center of gravity of the beam coincides with the plate element ignoring offset present between them. Moving live load analysis is performed using step by step method in which load moves in longitudinal as well as transverse direction giving the worst case for maximum bending moments, shear forces and deflections. Then Moving live load analysis for 2 lane T-beam bridge is carried out for IRC Class 70R wheeled vehicle and compare the result by modeled in sap2000,2016 of same dimension and the effect of the number of cross girders in the deck span on bending moments, shear forces and deflections of longitudinal girders is presented.

Numerical Study On Response Of Exterior Beam-Column Joint Under Cyclic Loading

In Present scenario, recent earthquakes have illustrated the severity of existing reinforced concrete (RC) beam-column joints to lateral loading. The sub-assemblage of Beam-Column are severe portion in reinforced concrete moment resisting frame as the high shear forces and larger moments getting attracted towards the joint. The Philosophy of Exterior beam-column joint are to observe its behaviour and has a significant role on the response of the reinforced concrete structure. This study includes numerical study on Exterior reinforced beam column joint with adequate shear reinforcement at joint as per IS: 13920-2016 and without shear reinforcement at joint as per IS: 456-2000. The seismic performance of G+5 RC Building of Zone III analyzed using SAP2000 and output of maximum shear force and bending moments are obtained, and one of the exterior beam-column joints at an intermediate storey is designed and satisfied for strong column and weak beam concept. The earthquake analysis of RC building of Zone III are carried out by incorporating all the modifications as per IS 1893:2002(Part-I) for Seismic loading, the loading is followed as per IS: 875 for dead and live loads and design as per code IS 13920:2016 and IS456:2000. Full scaled specimens were Numerically modelled in ANSYS 19.0 for constant axial load on column top and cyclic loading on beam end of each specimen, detailed as per IS 456:2000 and the other as per IS 13920:2016, were tested and response are obtained. This study outlined that model of IS13920:2016 performs more effective in controlling the seismic responses compared with model of IS456:2000. Further, there is significant reduction in Shear stress and observed improved ductility by providing adequate shear reinforcement in joint core of beam-column sub-assemblage.

Parameter optimization and quality analysis of pulsed laser joining of 316L stainless steel and polylactic acid

To realize the joining of dissimilar material 316L stainless steel with polylactic acid (PLA), the laser-assisted metal-plastic direct joining (LAMP) method was applied, and the process parameters were optimized based on the method of orthogonal experiment, and the quality of the joint was studied. The influence law of each influencing factor of the joining process on the joint quality and joint morphology was obtained through orthogonal experiments, to find out the maximum influencing factor and obtain the optimal process combination. By a universal tensile testing machine to find out the influence of the process parameters on the joint failure modes. The results showed that the laser power, pulse duty ratio, and laser speed had a major influence on the shear force, elongation at break and joint width. The maximum shear force achieved by the optimized method was 1694.379 N, reaching 88.73 % of the tensile force of the PLA base material, and the elongation at break was 5.47 %, reaching 76.91 % of the base material, obtained a more satisfactory joint effect. The correspondence between five joint morphologies and four failure modes is established, and different process parameters can be selected according to different applications of 316L stainless steel-PLA composite materials, to optimize industrial manufacturing.

Microstructural Evolution and Mechanical Properties of Cu/Ti Joints Welded by Ultrasonic Spot-Welding with Zn Interlayer

Cu/Ti dissimilar metals were joined together utilizing ultrasonic spot welding with a Zn interlayer. The threedimensional finite element analysis model was established to simulate the temperature field of the interface of Cu/Ti ultrasonic welding joint under different welding energies. The interface forming, microstructure, and mechanical properties of the Cu/Zn/Ti ultrasonic spot-welded joints were studied systematically. Results showed that the temperature distribution of the interface of the Cu/Zn/Ti ultrasonic welding joint was inhomogeneous, and the temperature of the interface below the indentation reached the highest and decreased gradually to the surrounding. With the increase of welding energy, the maximum temperature and the corresponding high-temperature region of Cu/Zn/Ti joint interface gradually increased. The interface of Cu/Zn/Ti ultrasonic welding joint was well formed, and the thickness was different, and the local position had wavy undulation morphology. When the welding energy was low, the interface microstructure was mainly composed of copper solid solution and titanium solid solution. As the welding energy increased, the microstructure of the joint interface was composed of CuZn compound, copper solid solution and titanium solid solution. When the welding energy was increased to 2000 J, the joint interface microstructure was composed of CuZn, Zn15Ti compound and copper solid solution. In comparison, Cu/Ti joints welded with a Zn interlayer in-between displayed the maximum shearing force about 33.5% greater than those of joints without a Zn interlayer.

Effect of spiral scan distance on the nanosecond-pulsed-laser lap joint of Al/Cu

The T2 Cu with a thickness of 0.2 mm and 6063 Al alloy with a thickness of 0.4 mm were joined via nanosecond pulsed laser welding in an inner spiral scanning mode. The lap configuration was Cu (upper)/Al (under). The influence of spiral scan distance (spiral distance for short) on the weld formation, microstructure and mechanical property was investigated. The results showed that circular holes and arc-shaped cracks formed on the weld surface at the spiral distance of 0.02 mm, and these defects disappeared at higher spiral distances. The tendency of porosity increased initially and decreased afterwards as the spiral distance increased. The interfacial morphology exhibited a wave-shaped structure at the spiral distance of 0.02 mm, and a continuous lump θ-CuAl2 phase was produced at the interface. When the spiral distance was larger than 0.02 mm, the wave-shaped structure disappeared and V-shaped areas were generated due to the invasion of Al element into Cu base metal. α-Al and θ-CuAl2 phases were possibly produced in these areas. The Cu-rich areas generated on the sidewall of the weld could cause the formation of θ-CuAl2. According to the tensile-shear load results, the maximum shear force reached 107.7 N at the spiral distance of 0.04 mm. The satisfactory weld formation and larger effective bounding area contributed to the superior bonding strength. Three fracture modes (button pulling out failure, weld shear failure and interface failure) were observed in this study.

Near-infrared responsive gecko-inspired flexible arm gripper

Inspired by the microstructure of gecko toes, a drivable bionic gecko toe adhesion surface with double-layer structure was designed and fabricated. The driving ability is derived from the volume shrinkage of the dehydrated hydrogel after the driving hydrogel layer is irradiated by near-infrared light (808 nm) (the temperature of the single-layer hydrogel can be increased from 17.9 °C to 107 °C within 30s, and the curling angle can be curled by 0°–180°, similar to the folded state.), and another layer with a microstructure similar to gecko toes can withstand a maximum shear force of 22.4N/cm−2. The different properties of the two layers are combined together to achieve a reversible transition of adhesion/desorption similar to the gecko walking process. The double-layer structure of the drivable bionic gecko toe adhesion surface was structurally optimized to prepare a four-arm gripper that could grasp/release only by unilateral irradiation. This bilayer-structured bionic gecko toe adhesion surface has great design potential, and in the future, it is hoped that it can provide insights into the preparation of large-actuated remote-controlled robots and fast-actuated soft robots.

Fluid dynamics of the upper airway in pediatric patients with severe laryngomalacia.

Laryngomalacia is the top cause of pediatric laryngeal wheeze. We used computational fluid dynamics to study the inspiratory airflow dynamics in severe pediatric laryngomalacia. Computed tomography was performed on the upper airways of two infants, one with severe laryngomalacia and one with normal airway, and 3D models were reconstructed. ANSYS CFD-POST software was used to simulate airflow in these models to compare the volumetric flow rate, flow velocity, pressure, wall shear, and vortex. The volume flow rate in the laryngomalacia model was significantly reduced compared with the control model. Under inspiratory pressures, the peak flow velocity, pressure, and shear force in the control model appeared at the soft palate stenosis, while that in the laryngomalacia model appeared at the supraglottis stenosis. In both models, the maximum flow velocity and shear force increased with decreasing inspiratory pressure, while the minimum pressure decreased with decreasing inspiratory pressure. In the control model, the airflow vortex appeared anteriorly below the posterior section of the soft palate. In the laryngomalacia model, the vortex appeared anteriorly below the posterior section of the soft palate and anteriorly below the vocal folds. Our methodology provides a new mechanistic understanding of pediatric laryngomalacia.

Drag Reduction Analysis of the Hydrostatic Bearing with Surface Micro Textures

Surface microtexturing has been widely used due to its good hydrophobic or drag reduction characteristics, and become an effective method to improve product performance and reduce energy consumption. This paper mainly discusses the improvement of microtextures on the dynamic pressure characteristics of hydrostatic bearings, and explores the effects of texture parameters on carrying capacity, macroscopic wall two-plane shear force, cavity area and other factors. In the oil film model calculation of the smooth wall surface of the radial hydrostatic bearing under the action of high speed and large external load, the oil film divergent wedge often has a negative pressure area, which is obviously not in line with the actual situation, so the cavitation effect needs to be considered. The CFD analysis method of the “gas-oil” two-phase flow model was carried out by using the mixture model to seek the optimal texture model scheme and thus to improve the load carrying capacity (LCC) and reduce the wall shear force. The effects of the texture area arrangement and geometric parameters on the lubrication characteristics were compared and analyzed. It is found that the carrying capacity of local texture is better than that of global texture, and different texture arrangements can achieve better drag reduction rates. The work presented in this paper studies the lubrication of the surface texture of a hydrostatic bearing. Taking the oil film carrying capacity and shear force as the target parameters, the factors, such as texture morphology, geometric parameters, texture distribution and cavitation phenomenon, are investigated through simulation and experimental methods. The surface textured hydrostatic bearing is expected to obtain the maximum oil film carrying capacity and the minimum friction resistance. The analysis results show that by arranging the partial streamwise texture at the rear end of the diverging wedge, the maximum shear force of the wall can be reduced by about 15%, and the LCC can be increased by about 18%.

Marinating and Grilling as Methods of Sensory Enhancement of Sous Vide Beef from Holstein-Friesian Bulls

An attempt was made to identify technological solutions that would improve the quality of products from the meat of Holstein-Friesian (HF) bulls, with particular emphasis on standardising the quality of the longissimus lumborum (LL) and semimembranosus (SM) muscles. Marinating (Mar) and grilling (Grill) were used in combination with the sous vide (SV) method. The effects of the type of muscle (LL or SM) and the applied treatments (SV, SVMar, and SVGrill) on the yield, colour, maximum shear force (WBSF), tenderness, juiciness, and aroma intensity of grilled and marinated meat were determined. The applied treatments had a significant influence on the meat yield (p &lt; 0.001), WBSF (p &lt; 0.001), tenderness (p &lt; 0.01), and juiciness (p &lt; 0.05) assessed in sensory evaluation. Additional treatments supported the optimisation of the aroma and taste of LL and SM and reduced the WBSF. The SVMar method optimised the beef’s tenderness, and therefore, it can be recommended for preparing meat from HF bulls for consumption.

Development of AA6061/316 stainless steel surface composites via friction stir processing: Effect of tool rotational speed

Metallic and alloy particles are recognized as alternatives to ceramic reinforcements to improve the overall characteristics of Al metal matrix composites. The present study aimed to investigate the friction stir processing/manufacturing of the 316 stainless steel particles reinforced AA6061 Al matrix composites by varying the tool rotational speeds. The microstructure, tensile, hardness, wear, corrosion behavior, and shear punching tests of the composites were studied. The results showed that the friction stir processing route produced no particle-matrix reaction in the composite and dislocation entanglements were formed close to the inherent 316 stainless steel particles within the Al matrix. The improved mechanical action of the tool aided particle fragmentation as the average 316 stainless steel particle sizes decreased from 41.88 to 26.89 μm. As a result of the dynamic recrystallization and particle-assisted pinning effects, the mean grain sizes of the composite decreased from 7.48 to 4.31 μm when the tool rotational speed was raised. An increment in the tool rotational speed (800–1200 rpm) triggered a rise in the maximum shear force (1198–1562 N), tensile strength (200.09–279.98 MPa), and maximum hardness value (121–139 HV) of the composite while a favorable decrease in the composite's wear rate (0.63–0.20 mg/m) and the friction coefficient (0.38 ± 0.01–0.21 ± 0.01) ensued. The composite's improvement is attributable to the homogeneous spread of dislocation.

Evaluation of working conditions, work postures, musculoskeletal disorders and low back pain among sugar production workers.

It is generally agreed that musculoskeletal disorders (MSDs) are a severe health concern, particularly for agricultural laborers. The study aimed to identify risk factors and work-related disorders among agricultural workers at Amirkabir agro-industry company in Iran. A total of 158 workers, of which 66 were manual harvesting workers (four postures), 40 were fertilizer transportation workers (three postures), and 52 were spraying workers (one posture), were included in the study. The research used questionnaires to collect data, and the postures were analyzed using 3DSSPP software. Related risk factors such as age, body mass index, work experience, working hours, and sports activity were analyzed. The incidence rate of lower back pain (94%), knee pain (82%), neck pain (69%), upper-back (63%), and shoulder (63%) were calculated. The logistic regression revealed that working hours and sports activities are significantly correlated to the wrist/hand and neck MSD with 5.62 and 6.38 times more likely among manual harvesting workers. The 3DSSPP software estimated that the lower back pain, especially in the first posture, for manure transportation workers was very high. Maximum L5-S1 compression, shear, and moment forces in the first posture among manure transportation workers were 7113 N and 472 N, -381 N-m, respectively. The 3DSSPP results also illustrated that compression, shear, and moment forces exceeded the NIOSH limit for the other postures. After interventions, compression, shear, and moment forces among all farm workers decreased. These findings emphasize that farm workers need to be under surveillance continuously at their workstations where interventions and improvement in specific tasks are required.

An approach to weld dissimilar polycarbonate and high-density polyethylene by friction stir spot welding

The friction stir spot welding of polymeric materials has been examined extensively; conversely, only a few researchers have addressed the friction stir spot welding of dissimilar polymers. In this study, the possibility of friction stir spot welding of dissimilar polycarbonate to high-density polyethylene is examined, which has not been previously investigated. The influence of welding parameters, namely, tool rotational speed and dwell time, was investigated experimentally, whereas the plunging depth, plunging rate, and tool geometry were kept constant during all tests. The induced temperature and the weld lap shear force were recorded and analyzed. Both materials are welded successfully by friction stir spot welding. At 2300 rpm and 40 s dwell time when the polycarbonate sheet was on the top, the maximum lap shear force of 0.37 kN was obtained. The findings demonstrated that an effective weld might be attained at a moderate frictional heating temperature slightly below the melting temperature Tm and glass transition temperature Tg of both welded materials. At very low temperatures, poor weld quality was obtained. When temperatures extensively increased, the results deteriorated to exhibit weak joint lap shear values because of the presence of cavities and pores in the weld junction.

Prediction of capacity of reinforced concrete shear wall with multiple openings by using nonlinear finite element analysis

AbstractThe effect of openings left in reinforced concrete shear walls due to functional requirements or architectural reasons is an important issue that should not be underestimated mainly since shear walls are considered as one of the most critical load‐carrying members in a structure owing to playing an active role against seismic forces. In this paper, a parametric study was carried out by creating a nonlinear finite element model to determine the effects of openings in reinforced concrete shear walls on the maximum shear force bearing capacities, initial stiffness, displacement ductility ratios, and energy dissipation capacities of the shear walls. The variables examined in the study were the size of the openings left in the reinforced concrete shear walls, opening location, the number of openings, and the concrete compressive strength used in the production of the shear walls. In the first part of the study, nonlinear finite element models of three experimental shear wall test elements: one with no opening (solid), and two with openings: were created using ABAQUS finite element software package, then verified by comparing the numerical analysis results with the experimental results. In the second part of the study, a nonlinear finite element model of 44 reinforced concrete shear walls, including the parameters planned to be investigated, was created by using the verified model, and finite element model (FEM) analyses were performed. As a result of numerical analyses, a capacity reduction coefficient proposal has been developed to calculate the shear force capacities of reinforced concrete shear walls with openings.

Experimental studies on application of silver paste in thermosonic flip-chip bonding

In this subject, thermosonic flip-chip technology was introduced to conduct low-temperature bonding of Ag paste and chip interconnection experiments with micro solder joints. The coating and printing method is used to realize the uniform coating of the Ag paste on the micro Cu pillars, and the thickness of the coated Ag paste can be controlled. During flip-chip bonding, different power, pressure, temperature, and bonding time will affect the shear resistance of the solder joint after bonding. Therefore, this article controls the above factors and only studies the impact of ultrasonic power and pressure on the shear force of the solder joint interface. The experiment found that before reaching the maximum shear force, as the ultrasonic power increases, the shear resistance of the solder joint also gradually increased. After that, as the ultrasonic power increased, the shear resistance of the solder joints gradually decreased. It shows that when using thermosonic flip-chip technology for chip bonding, the ultrasonic power should be maintained in an appropriate range to make the bonded flip-chip solder joints obtain a maximum shear strength. The bonding pressure is proportional to the shear strength of the solder joint.

Microstructure and Mechanical Properties of Laser Welded Magnesium Alloy/Steel Joint Using Cu-Si Composite Interlayer

In this study, Cu-Si composite powder was used as the interlayer to carry out laser lap deep penetration welding of AZ31B magnesium alloy and DP590 dual-phase steel. The effects of Cu-Si composite powder on the weld formation, microstructure, and mechanical properties of magnesium alloy and steel joint were studied. The results show that the addition of Si can improve the laser absorption rate of the interlayer and increase the melting depth at the magnesium side. In addition, the Cu-Si composite interlayer hindered the diffusion of Al, and reduced the thickness of reactive layer at the magnesium alloy and the steel interface. After adding Si into the interlayer, the reactive layer changed from Fe3Al+α-Mg to Fe-(Al, Si) +α-Mg and the content of intermetallic compounds in the reactive layer decreased, which improved the plastic deformation capacity and the ductility of the reactive layer. As a result, the tensile shear force firstly increased and then decreased with the Si increase. The maximum tensile shear force of 86.2 N/mm was achieved when the Si content was 5%, which was 20.4% higher than that of the Cu interlayer. Plus, the fracture location changed from near the steel side to near the magnesium side weld.

Design and Performance of Armature Surface Coating for Electromagnetic Launcher

Armature is the key component of electromagnetic launcher (EML), but in the process of launching, its working environment is bad and the surface is seriously worn. Excessive wear will seriously weaken the mechanical properties of armature and affect the launching safety. Therefore, it is necessary to deal with the surface state of armature to reduce wear and improve the performance of armature. First, the properties of the candidate materials are analyzed. According to the principle of maximum current carrying capacity per unit mass, aluminum is the most suitable material for armature manufacturing. At the same time, the defects of material selection in single material system are pointed out. Second, based on the above problems, the surface coating design scheme is proposed. From the point of view of material melting point and hardness, it is proposed that tungsten can be used as the coating material for armature surface. According to the wear amount of armature tail under launch condition, the coating shape and thickness are designed. The best coating forming process is determined by calculating the shear force between coating and substrate; finally, the effect of the coating on the electric contact performance, system efficiency, and projectile gouging threshold velocity is analyzed. The results show that the maximum shear force between the coating and the substrate is above 171 MPa under the launching condition, and the laser cladding technology can meet the process requirements. After coating treatment, the contact resistance between the armature and rail (AR) increases by 6%, which has little effect on the system efficiency. Although it will affect the projectile gouging threshold velocity, it can be improved by modifying the tungsten coating or rail surface treatment. The analysis results are of great significance to reduce the armature wear, improve the contact performance between the AR, and improve the launch safety.