An Investigation on Anisotropy Behavior and Forming Limit of 5182-H111 Aluminum Alloy
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JMEPEG https://doi.org/10.1007/s11665-020-04879-7
An Investigation on Anisotropy Behavior and Forming Limit of 5182-H111 Aluminum Alloy Zhaoxuan Hou, Zhigang Liu, Min Wan, Xiangdong Wu, Bing Yang, and Xu Lu (Submitted December 16, 2019; in revised form March 11, 2020) This paper studies the anisotropy behavior and forming limit of 5182-H111 aluminum alloy by experiments and theoretical analysis. The uniaxial tension tests for three different sheet directions were conducted to investigate the anisotropic properties of Al5182-H111 sheet. Moreover, the Nakajima tests for both rolling and transverse directions were performed to get the forming limit data. The experimental results show that the forming limit curves (FLCs) for rolling direction are much lower than that for transverse direction. In order to further investigate the influence of anisotropic properties on FLCs, the theoretical prediction of FLC was accomplished based on three different hardening laws. The results show that the theoretical FLC with Ghosh hardening law has much better agreement with experimental data. Furthermore, a new FLC was proposed by extending the forming limit from the strain state of uniaxial tension at transverse direction to the strain state of uniaxial tension at rolling direction. The adaptability of new FLC was verified in the Drawing test and Erichsen cupping test. Keywords
5182-H111 aluminum alloy, anisotropy behavior, forming limit curve, fracture prediction
1. Introduction 5182-H111 Aluminum alloy, because of their high strength to weight ratio, good plasticity deformation ability and low density, is extensively used in automobile industry (Ref 1). To exploit the forming ability of 5182-H111 aluminum alloy sheets and guarantee the quality of parts in forming process, it is necessary to acquaint the forming limit of metal sheets. The forming limit diagram (FLD) is the most popular criterion for predicting forming failure of sheet metal. This diagram attempts to provide a graphical description of metal sheet failure tests. The FLD is consisted by a mathematical curve, also known as a forming limit curve (FLC), which is fitted by forming limit strain in various forming paths (Ref 2). Theoretically, the determination of a FLC depends on the yielding, hardening and fracture behavior of material. The yield point indicates the limits of elastic deformation and the beginning of plastic deformation. Many studies have reported the influence of yield behavior on formability of material, especially for anisotropic yield behavior. Among them, the Hills series anisotropic yield functions are most widely used in the formability study of aluminum alloy (Ref 3). Meanwhile, the hardening behavior of material also plays an important role in the prediction of FLC. Hardening law describes the strengthening capability of metal sheet by plastic deformation. There are two
Zhaoxuan Hou, Min Wan, and Xiangdong Wu, Beihang University, Beijing 100191, China; Zhigang Liu, Institute of High Performance Computing, A*Star, 1 Fusionopolis Way, Singapore 1386
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