Residual stress field of wire arc additive manufacturing AA7075 aluminum alloy thin-walled parts by stress iteration method
The residual stress is a key factor affecting the fatigue life of wire arc additive components.It is difficult to analyze the residual stress distribution of additive components completely and efficiently by traditional measurement and simulation.Based on the principle of eigenstrain compatibility,a new method was proposed to reconstruct the residual stress field of AA7075 aluminum alloy thin-walled by stress iteration.In this method,the finite residual stress data and basis function were used to construct the stress component,APDL language was used for secondary development of ANSYS,and the stress component was mapped to the finite element model to reconstruct the residu-al stress field iteratively.The results showed that the reconstructed residual stress field had little error with the measured value of X-ray diffraction method and the simulated value of thermos-elastoplastic model,which proved the effectiveness of this method on reconstructing the global residual stress field of wire arc additive manufacturing thin-walled parts.
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