Anisotropic plastic deformation of extruded aluminum alloy tube under axial forces and internal pressure
Anisotropic plastic deformation of extruded aluminum alloy tube under axial forces and internal pressure
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DOI：
10.1016/j.ijplas.2004.04.006
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发表时间：
2005-01-01
影响因子：
9.8
通讯作者：
Takahashi, S
中科院分区：
文献类型：
--
作者：
Kuwabara, T;Yoshida, K;Takahashi, S
利用伺服拉力-内压试验机研究了外径76 mm、壁厚3.9 mm的5000系列铝合金A5154-H112挤压管材的各向异性塑性变形行为。这台机器能够使用电子闭环控制系统对管状试件施加任意的应力或应变路径。详细测量了初始屈服轨迹、不同加工硬化程度的塑性功等值线，以及线性和组合应力路径下增量塑性应变向量的方向。结果表明，在主应力空间中测得的等值线形状相似，在恒应力比下，增量塑性应变向量的方向几乎保持不变。在各向同性强化假设下，使用Hosford屈服函数或Yld2000-2D屈服函数预测的加工硬化行为与线性和组合应力路径的观测结果非常吻合。因此，这种材料的加工硬化几乎是各向同性的。这两种屈服函数都是预测材料各向异性塑性变形行为的有效唯象塑性模型。(C)2004爱思唯尔有限公司。保留所有权利。
The anisotropic plastic deformation behavior of extruded 5000 series aluminum alloy tubes, A5154-H112, of 76 mm outer diameter and 3.9 mm, wall thickness is investigated, using a servo-controlled tension-internal pressure testing machine. This machine is capable of applying arbitrary stress or strain paths to a tubular specimen using an electrical, closed-loop control system. Detailed measurements were made of the initial yield locus, contours of plastic work for different levels of work-hardening, and the directions of the incremental plastic strain vectors for both linear and combined stress paths. It is found that the measured work contours constructed in the principal stress space are similar in shape, and that the directions of the incremental plastic strain vectors remain almost constant at constant stress ratios. The work-hardening behavior predicted using Hosford's or the Yld2000-2d yield functions under the assumption of isotropic hardening agrees closely with the observations for both linear and combined stress paths. The material is thus found to work-harden almost isotropically. Both yield functions are effective phenomenological plasticity models for predicting the anisotropic plastic deformation behavior of the material. (C) 2004 Elsevier Ltd. All rights reserved.