| Metal components often experience fatigue fracture after being subjected to alternating external loads.Shot peening,as a simple and effective surface strengthening technique,can effectively improve the surface integrity of materials and significantly enhance their fatigue resistance.TC4 titanium alloy has advantages such as good plasticity,toughness,high strength-to-weight ratio,and excellent biocompatibility with the human body.However,it has poor hardness,wear resistance,and fatigue performance,which can lead to early failure.Therefore,this study employs supersonic shot peening to surface strengthen TC4 titanium alloy target materials in order to enhance their fatigue resistance.Due to the reduction in the diameter of the projectiles after continuous use and wear,it is important to accurately reflect the changes in projectile diameter during actual shot peening production.Therefore,this study also investigates the mixed peening of projectiles with different diameters(different diameter differences and different diameter ratios).Based on the secondary development interface of the Abaqus finite element software,this study uses the Python programming language to establish models for supersonic non-mixed peening(projectiles with the same diameter)and mixed peening.It investigates the residual stress fields generated in TC4 target materials under different peening parameters.Furthermore,combining the extended finite element method(XFEM),it examines the influence of residual stress fields on the fatigue life of TC4 titanium alloy target materials.Through supersonic non-mixed peening simulation analysis using ABAQUS,it was found that the residual stress fields generated on the surface of the target material vary for projectiles with different diameters(projectile diameters D of 0.3,0.4,0.5,and 0.6 mm)at a peening velocity of 110 m/s and 100% coverage.As the projectile diameter increases,the surface residual compressive stress gradually increases,with the smallest surface residual... |
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