Influence of Pre-strain on Very-Low-Cycle Stress–Strain Response and Springback Behavior

Influence of Pre-strain on Very-Low-Cycle Stress–Strain Response and Springback Behavior
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预应变对极低周应力应变响应和回弹行为的影响

DOI:
10.1007/s11665-020-05399-0
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发表时间:
2020
影响因子:
2.3
通讯作者:
Nürnberger
Nürnberger
中科院分区:
材料科学4区
文献类型:
--
作者:
Barienti;Wackenrohr;Herbst;Nürnberger

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预应变对极低循环载荷行为的影响,例如在金属板的辊式矫直过程中,尚未完全了解。在这种情况下,一个关键因素是材料的刚度及其在加工过程中的变化。为了研究低周小幅加载下多种金属的力学性能变化规律,对低碳钢DC 01、纯铜CU-DHP和α-钛进行了低周拉压试验。关于材料硬化和弹性性能的变化,预应变和施加的应变振幅的一般影响进行了研究。结果表明,所有测试的材料在循环过程中的Bauschinger行为的特征变化。材料的表观弹性模量随累积塑性应变的增加而减小,其变化规律与应变幅值和预应变有关。对于所有三种材料,技术回弹的变化是存在的,并取决于加载历史。
The influence of pre-strain on the very-low-cycle loading behavior as occurring, for example during roller leveling of sheet metals, is not yet fully understood. A key factor in this context is the stiffness of the material and its changes upon processing. To study the general mechanical property changes during low-cycle loading with small amplitudes for a wide variety of metals, sheet samples of mild steel DC01, pure copper CU-DHP andα-titanium are subjected to low-cycle tension–compression tests. The general influences of pre-strain and the applied strain amplitude are investigated regarding material hardening and changes in the elastic properties. It is shown that all tested materials feature changes in the Bauschinger behavior during cycling. The apparent elastic modulus of the materials decreases with increasing accumulated plastic strain, and the evolution depends on the strain amplitude and the pre-strain. For all three materials, changes in technical springback are present and depend on the loading history.
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