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Further investigation of the hydrostatic bulge test in a plasticity laboratory

机译:在可塑性实验室中对静水膨胀试验的进一步研究

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In plasticity theory, the effective stress-strain curve of a metal is independent of the loading path. The simplest loading path to obtain the effective stress-strain curve is a uniaxial tensile test. In order to demonstrate in a plasticity laboratory that the stress-strain curve is independent of the loading path, the hydrostatic bulge test has been used to provide a balanced biaxial tensile stress state. In our plasticity laboratory we compared several different theories for the hydrostatic bulge test for the determination of the effective stress-strain curve for two representative metals, brass and aluminium alloy. Finite element analysis (FEA) was performed based on the uniaxial tension test data. It was shown that the effective stress-strain curve obtained from the biaxial tensile test (hydrostatic bulge test) had a good correlation with that obtained in the uniaxial tensile test and agreed well with the analytical and FEA results. This paper may be used to support an experimental and numerical laboratory in teaching the concepts of effective stress and strain in plasticity theory.
机译:在可塑性理论中,金属的有效应力-应变曲线与加载路径无关。获得有效应力-应变曲线的最简单加载路径是单轴拉伸试验。为了在可塑性实验室中证明应力-应变曲线与加载路径无关,静水膨胀试验已用于提供平衡的双轴拉伸应力状态。在我们的可塑性实验室中,我们比较了流体膨胀试验的几种不同理论,以确定两种代表性金属(黄铜和铝合金)的有效应力-应变曲线。基于单轴拉伸试验数据进行了有限元分析(FEA)。结果表明,双轴拉伸试验(静水膨胀试验)获得的有效应力-应变曲线与单轴拉伸试验获得的有效应力-应变曲线具有良好的相关性,并且与分析和有限元分析结果吻合良好。本文可用于支持实验和数值实验室,以教授可塑性理论中的有效应力和应变概念。

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