Effect of residual stress on the tensile loading of a gradient microstructure material obtained by surface mechanical attrition treatment

Zihao Guo (1) , Jianqiang Zhou (2) , Bruno Guelorget (1) , Zhidan Sun (1) , Delphine Retraint (1) , Benoît Panicaud (1)

1 LASMIS - Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée
2 NPU - Northwestern Polytechnical University [Xi'an]

During the surface mechanical attrition treatment (SMAT), residual stress, work hardening and grain nano-crystallization are produced simultaneously, which allows to enhance the mechanical properties of materials. In this work, a dislocation density-based constitutive model is adapted to describe the local mechanical behavior of the gradient microstructure generated by SMAT and predict the macroscopic behavior of a SMATed cylindrical structure under tensile loading. A finite element (FE) model is built to perform uniaxial tensile simulation with the introduction of a residual stress field and a work hardening gradient obtained by X-ray diffraction (XRD). The results of simulation are in good agreement with the experimental results. Furthermore, it has been found that the residual stress plays a significant role in the initial stage of deformation. It decreases the yield stress of such gradient microstructure materials.

Mots clés: Gradient microstructure material; Residual stress; Surface mechanical attrition treatment; Tensile loading; Finite element modeling

Domaines: Mécanique des matériaux [physics.class-ph]

Zihao Guo, Jianqiang Zhou, Bruno Guelorget, Zhidan Sun, Delphine Retraint, et al.. Effect of residual stress on the tensile loading of a gradient microstructure material obtained by surface mechanical attrition treatment. ICRS11 – 11th International Conference on Residual Stresses, Mar 2022, Nancy, France. ⟨hal-03634715⟩