Numerical investigation on the forming behaviour of stainless/carbon steel bimetal composite

Zhou Li,Qingfeng Zhang,Zhengyi Jiang,Sihai Jiao,Jingwei Zhao,Gow-Yi Tzou

doi:10.1051/matecconf/201818500012

Zhou Li, Qingfeng Zhang + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201818500012

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Abstract

Bimetal composites have wide applications due to their excellent overall performance and relatively low comprehensive cost. The aim of this study is to investigate the forming behaviour of stainless/carbon steel bimetal composite during stamping by finite element method (FEM). In this work, the bonding interface of bimetal composite sheet was assumed to be perfect without delamination during the plastic forming process for simplicity. Uniaxial tensile tests on base metal (carbon steel) and compositing metal (stainless steel) were first carried out, respectively, in order to obtain the tensile properties of each of the component materials required in the forming simulation. Processing variables, including the layer stacking sequence, relative thickness ratios of two layers and friction were considered, and their effects on the distributions of circumferential stress and thickness strain were analysed. The bimetal composite sheet was set as the eight-node solid elements in the developed FEM model, which is effective for evaluating the distributions of circumferential stress and thickness strain, and predicting the high-risk region of necking during the stamping of bimetal composites. The simulation results can be used as an evaluation indicator of the capability of forming machine to ensure the bimetal composite can be safely formed.

Highlights

With the increasing demands for the multi-functionality of industrial products, many research efforts in materials science and engineering have focused on developing engineering materials of better mechanical capabilities and low comprehensive cost, such as bimetal composites [1]
Their studies indicated that the contact of stainless steel with the punch leads to the maximum drawing ratio in direct redrawing, but the aluminium should contact the punch in order to obtain the highest drawing ratio in reverse redrawing
The following conclusions can be obtained: (1) The stacking sequence of layers has an influence on the load of punch, which means that the load is higher when the strong material (2205) is positioned in the underneath layer, but its effect is rather small in the initial stamping process

Summary

Introduction

With the increasing demands for the multi-functionality of industrial products, many research efforts in materials science and engineering have focused on developing engineering materials of better mechanical capabilities and low comprehensive cost, such as bimetal composites [1]. Some common fabrication processes, such as hemming, bending, and large plastic forming, are adopted to further manufacture those bimetal and laminated metal composites [2] In this case, many research works have been studied on the behaviours of bimetal composite sheets during the forming process. Morovvati et al [5] used the experimental and finite element investigation on wrinkling of circular two-layer metal sheets in the deep drawing process, and the influences of different blank holder forces on winkling were analysed. They studied the relationship between the required forming force and the drawing radio. In the previous works, those studied bimetal or laminated metal composites were thin sheets, but less people paid attention to the formability of the medium and thick bimetal composite

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