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第三届国际机械工程与力学会议

作者： Yazhi LI Hongbin ZHOU Qingju ZHU College of Civil Engineering and Mechanics Yanshan University

inherent strain FEM is a recently developed numerical technique to forecast welding residual deformations. It makes use of the concept of inherent strain distribution to effectively reduce the analysis of the very complex highly nonlinear welding process to an equivalent linear elastic FEA, thus the computational cost could be significantly reduced. In this paper, the inherent strain coefficients for the welding process of low-alloy high tensile strength steel Q345 have been derived by using both elastic-plastic finite element analyses and experimental studies of twelve bead-on-plate specimens. It has been found that the results from the two methods compare well. Using the inherent strain coefficients derived, an example application of the inherent strain FEM to a real life welding process has been demonstrated.

关键词： inherent strain low-alloy steel numerical simulation welding deformation deformation control

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Study of residual stresses and distortions from the Ti6Al4V based thinwalled geometries built using LPBF process

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Defence Technology（防务技术） 2023年第10期28卷 33-41页

作者： Jagatheeshkumar S Raguraman M Siva Prasad AVS Nagesha B K Chandrasekhar U Indian Institute of Information Technology Design and Manufacturing KancheepuramChennai 600127India Gas Turbine Research Establishment DRDOBengaluru 560093India Wipro3D Bengaluru560058India

The current paper focuses on the prediction of residual stresses and distortions in the Laser Powder Bed Fusion(LPBF)built Ti6Al4V thin-walled geometries using Ansys Additive Print(AAP)software which employs a layer-by-layer accumulation of inherent strain to calculate the *** and anisotropic strain scaling factors were calibrated initially within the APP software for the Ti6Al4V based single cantilever beam ***,the numerical simulations were performed in APP software and computed the residual stresses and distortions for the varied process parameters including laser power,scan speed and hatch distance while maintaining the layer thickness constant for all the design *** numerical predictions were compared;they were found to match reasonably well with the XRD measurements within the calibrated regime.

关键词： Ti6Al4V Thin-walled geometry Residual stress inherent strain XRD Ansys additive print

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