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Taguchi Grey Relationalapproach Foroptimizing Process Parameters of Laser Peeningontitanium Alloy to Induce Enhanced Compressive Stress Based on Finite Element Simulation
摘要： Laser Shock Peening (LSP) turned out the most efficient surface engineering process for advanced materials to induce beneficial deep compressive residual stress which helps in improving mechanical, fatigue properties and surface damage resistance. But, analyzing the non-uniform distribution of residual stresses in the treated sample with XRD is much time taking and costly process. This problem can be resolved with LSP finite element numerical simulation model which is feasible with the realistic experimental process. The FE model allows the user to control the laser parameters in order to achieve the optimal level of all controllable parameters. The present study is intended to analyze and optimize the influence of laser processing parameters assists in inducing the residual compressive stress with minimal surface deformation.A Ti6Al4V material model with Johnson-Cook’s visco-elastic-plastic material behaviour law is prepared for LSP simulation. And Gaussian pressure profile is utilized for uniform loading of the targeted zone for the proposed model. Taguchi Grey Relational Analysis (TGRA) with L27 orthogonal array is applied to LSP simulation, and the results were analyzed with consideration of multiple response measures. It is noted that surface deformation is increased with the rise in a number of laser shots and pressure pulse duration. Maximum compressive residual stresses are falling for higher levels of laser spot diameter, Laser spot overlap and Laser Power density. The correlation is observed between FE simulation and published results. The optimal set of process parameters are obtained for improving the LSP on Ti alloys.
关键词： Grey Relational Analysis (GRA),Taguchi Technique,Laser Shock Peening (LSP),Finite Element Method (FEM),Residual Stresses
更新于2025-09-23 15:21:01
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Laser shock peening modified surface texturing, microstructure and mechanical properties of graphene dispersion strengthened aluminium nanocomposites
摘要： The present work has important implications for the use of graphene as reinforcement and interlocking the grains in nanocomposites. In order to achieve this, low energy laser shock peening (LSP) assessed on graphene (0.4 wt %) - AA 7075 nanocomposites fabricated through powder metallurgy (PM) technique and hot extrusion (28:1 extrusion ratio). As a consequence, substantial improvement in microstructure observed for the nanocomposites up to 400 μm depth. The added graphene serves the pinning effect and blocks the grain growth in the nanocomposites. LSP contribute the additional grain refinement effectively along interlocking the grains by graphene called pinned dislocation core in the nanocomposites leading to large deformation texture strengthening. Addition of graphene found to have improved in the ultimate tensile strength (UTS) by 42.93 %, LSP has contributed 10.66 %.
关键词： Laser Shock Peening (LSP),Dislocation,Nanocomposites,Graphene,Texture
更新于2025-09-09 09:28:46