Quantitative analysis on the onset of necking in rate-dependent tension

Quantitative analysis on the onset of necking in rate-dependent tension
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速率相关张力中缩颈发生的定量分析

DOI:
10.1016/j.matdes.2013.11.010
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发表时间:
2014-04
影响因子:
8.4
通讯作者:
Zhiping Guan
Zhiping Guan
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhiping Guan

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基于哈特准则,通过精确测量应变硬化指数n和应变速率敏感指数m,定量分析了Zn-5%Al合金在340 °C速率相关拉伸条件下的颈缩起始点。导出了应变率与均匀应变的临界关系,并证明了该关系是表征率相关材料均匀变形能力的一个重要力学参数。在特定的应变路径与应变速率,拉伸速度和载荷的颈缩的发病预测同意的临界关系,这表明在这项研究中的不稳定性分析的有效性。该临界关系表明,颈缩的发生仅取决于拉伸时的应变和应变速率的最终值,而与应变路径、变形条件和应变历史无关,这对提高超塑性成形的成形性能和缩短成形时间具有重要意义。此外,由于不涉及其他应变路径下的试验数据,证明了恒载拉伸是精确建立临界关系的一种非常有效的方法。
Quantitative analysis on the onset of necking of Zn–5%Al alloy at 340 °C in rate-dependent tension is developed based on Hart’s criterion, through accurately measuring the values of the strain hardening index (n) and the strain rate sensitivity index (m). A critical relation of strain rate to uniform strain is derived and then is verified to be an essential mechanical parameter for characterizing the capability of uniform deformation of rate-dependent materials. The prediction of the onset of necking at specific strain paths with strain rates, tensile velocities and loads agrees well with the critical relation, which suggests the validity of instability analysis in this study. The critical relation indicates that the onset of necking is dependent only on the final values of strain and of strain rate in tension, and is independent of strain path, deformation condition or strain history, which is of great significance for the increase of formability and the reduction of forming time in superplastic forming process. Additionally, it is proved that the tension at constant load is a very effective approach for precisely establishing the critical relation, due to not involving test data at others strain paths.
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