A critical comparison of various data processing methods in simple uni-axial compression testing
A critical comparison of various data processing methods in simple uni-axial compression testing
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DOI：
10.1016/j.matdes.2011.01.007
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发表时间：
2011-05
影响因子：
8.4
通讯作者：
Dipti Samantaray;S. Mandal;A. K. Bhaduri
中科院分区：
文献类型：
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作者：
Dipti Samantaray;S. Mandal;A. K. Bhaduri
本文比较了从单轴压缩试验产生的载荷-变形曲线中获取真实应力-塑性应变数据时，各种数据处理方法的误差。为此，对改性9Cr-1Mo铁素体钢、D9合金（一种钛改性奥氏体不锈钢）和316L(N)奥氏体不锈钢三种具有代表性的材料在较宽的温度和应变速率范围内进行了单轴压缩试验。结果表明，无论从载荷-行程曲线还是工程应力-应变曲线中剔除弹性区域，计算三种材料的最大真塑性应变的绝对平均误差均大于5%，有时甚至高达42.1%。然而，如果从真实应力-应变曲线中去除弹性区域，计算塑性应变的绝对平均误差总是小于5%。
The paper compares the error associated with various data processing methods to obtain true stress–plastic strain data from the load–deformation curves generated from uni-axial compression tests. Towards this end, uni-axial compression tests have been conducted on three representative materials viz. modified 9Cr–1Mo ferritic steels, alloy D9 (a titanium modified austenitic stainless steel) and 316L(N) austenitic stainless steel in wide ranges of temperatures and strain rates. It has been observed that the absolute average error associated with maximum true plastic strain calculation in all the three materials is always more than 5% and sometimes as high as 42.1% if the elastic region is removed either from the load–stroke curve or engineering stress–strain curve to get the true stress–plastic strain curve. However, the absolute average error associated with plastic strain calculation is always less than 5% if the elastic region is removed from the true stress–strain curve.