Quantitative analysis on the onset of necking in rate-dependent tension
Quantitative analysis on the onset of necking in rate-dependent tension
复制标题
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
中科院分区:
文献类型:
--
作者:
Zhiping Guan
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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影响因子:
9.8
作者:
K. S. Havner
通讯作者:
K. S. Havner
DOI:
10.1016/c2013-0-02546-7
发表时间:
1973
期刊:
--
影响因子:
--
作者:
C. Reid
通讯作者:
C. Reid
影响因子:
2.3
作者:
Song Yu-quan;Guan Zhiping;Ma Pinkui;Song Jiawang
通讯作者:
Song Yu-quan;Guan Zhiping;Ma Pinkui;Song Jiawang
影响因子:
5.3
作者:
J. D. Campbell
通讯作者:
J. D. Campbell
DOI:
--
发表时间:
--
期刊:
--
影响因子:
--
作者:
M. Considére
通讯作者:
M. Considére