Plastic deformation of 2024-T351 aluminum plate over a wide range of loading conditions
Plastic deformation of 2024-T351 aluminum plate over a wide range of loading conditions
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DOI：
10.1016/j.ijsolstr.2013.02.006
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发表时间：
2013-05-15
影响因子：
3.6
通讯作者：
Gilat, A.
中科院分区：
文献类型：
--
作者：
Seidt, J. D.;Gilat, A.
研究了2024-T351铝合金板材在多种载荷作用下的塑性变形。单轴拉伸和压缩，以及纯剪切（扭转）测试已在广泛的应变率（10（-4）-10（4）s（-1））和温度（-50至450摄氏度）。结果表明，应变速率在5000 s（-1）左右时，塑性变形不受应变速率的影响。在应变率大于5000 s（-1）的压缩试验中观察到应变率效应。在不同温度下的试验表明，应力随温度的升高而降低。在300 ℃和450 ℃的温度下没有观察到应变硬化。拉伸、压缩和剪切试验产生的有效应力与等效应变曲线不一致，这表明与基于J（2）流动理论的塑性模型的预测存在差异。拉伸和压缩试验的结果表明，在不同的方向加工相对于板轧制方向的试样的拉伸和压缩试验表明，2024-T351板具有各向异性的性能方面的塑性。实验数据可用于塑性本构模型的评价和发展。本文用实验数据确定了参数，并检验了约翰逊和库克（1983）的塑性模型和巴拉特等（1991）的各向异性屈服函数的有效性。(C)2013爱思唯尔有限公司保留所有权利。
Plastic deformation of 2024-T351 aluminum plate is studied under multiple load conditions. Uniaxial tension and compression, and pure shear (torsion) tests have been conducted over a wide range of strain rates (10(-4)-10(4) s(-1)) and temperatures (-50 to 450 degrees C). The results show no strain rate effect on plastic deformation up to strain rates of about 5000 s(-1). Strain rate effect is observed in compression tests at strain rates above 5000 s(-1). Tests at various temperatures show decrease in stress with increasing temperature. No strain hardening is observed at temperatures of 300 degrees C and 450 degrees C. Effective stress vs. equivalent strain curves generated from tension, compression and shear tests do not coincide indicating a discrepancy with the prediction of J(2) flow theory based plasticity models. Experimental results from tension and compression tests on specimens machined in different orientations relative to the plate rolling direction show that the 2024-T351 plate has anisotropic properties with regard to plasticity. The experimental data can be used for the evaluation and development of constitutive models for plasticity. Here, the experimental data is used for determining the parameters and examining the validity of the plasticity model of Johnson and Cook (1983) and the anisotropic yield function of Barlat et al. (1991). (C) 2013 Elsevier Ltd. All rights reserved.