Study on a New Forming Method—Thread Rolling by Crystal Plasticity Finite Element Simulation

Yuheng Zhang,Zhiqing Hu,Liming Guo

doi:10.3390/met11030503

Abstract

In order to study a new thread rolling forming process from a microscopic perspective, a polycrystalline model was established, based on the crystal plasticity finite element method (CPFEM) and Voronoi polyhedron theory. The fluidity of metals was studied to explain the reason for the concave center. The simulation results show that the strain curve of the representative element can more truly reflect the deformation behavior of the material. The grain orientations after deformation are distributed near the initial orientation. The evolution of each slip system is determined by the initial grain orientations and grain locations. The pole figures obtained from the experiment show high consistency with the pole figures obtained by simulation, which verifies the accuracy of the texture prediction by CPFEM. The experimental results show that thread rolling is more uniform in deformation than ordinary rolling.

Highlights

Thread Rolling by Crystal PlasticityWith the progress of society, scientific research has begun to be closely linked in multiple disciplines and fields
It is of particular significance to study the changes of grain orientation and dislocation slip microscopically
Chen et al [19] used crystal plasticity finite element method (CPFEM) to analysis the copper rolling process, and the results showed that the movement of the slip system is different

Summary

Introduction

With the progress of society, scientific research has begun to be closely linked in multiple disciplines and fields. A better combination of numerical simulation and theory is required to establish a quantitative relationship between the micro- and macro-perspective. It is of particular significance to study the changes of grain orientation and dislocation slip microscopically. The crystal plasticity finite element method (CPFEM) has relatively high requirements from modeling to analysis, to data processing. Because of its academic frontier, it has become a hot spot in related research fields. When the size is reduced to the micro-scale, the size effects [1,2] become significant. The material will show anisotropy in the plastic deformation process [3]. The appearance of texture will have an important impact on the mechanical properties of the material [4,5]

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Conclusion