A novel reformulation of the Theory of Critical Distances to design notched metals against dynamic loading
A novel reformulation of the Theory of Critical Distances to design notched metals against dynamic loading
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DOI：
10.1016/j.matdes.2014.12.026
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发表时间：
2015-03
影响因子：
8.4
通讯作者：
T. Yin;A. Tyas;O. Plekhov;A. Terekhina;L. Susmel
中科院分区：
文献类型：
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作者：
T. Yin;A. Tyas;O. Plekhov;A. Terekhina;L. Susmel
本文对线弹性临界距离理论（TCD）进行了重新表述，使之适用于动态载荷下缺口金属材料的强度预测。根据在不同载荷/应变速率下测试铝合金6063-T5、钛合金Ti-6Al-4V、铝合金AlMg 6和AlMn合金的缺口圆柱形样品所产生的大量实验结果，检查了TCD拟定重新配方的准确性和可靠性。为了进一步验证所提出的设计方法，还考虑了从文献中获取的不同数据集。这样一个广泛的验证工作使我们能够证明，提出的TCD的重新制定是成功的预测缺口金属材料的动态强度，这种方法被证明是能够估计落在± 20%的误差区间。如此高的准确度当然是非常了不起的，特别是考虑到这样一个事实，即它是在不需要明确建模的应力与应变动态行为的研究韧性金属。
In the present study the linear-elastic Theory of Critical Distances (TCD) is reformulated to make it suitable for predicting the strength of notched metallic materials subjected to dynamic loading. The accuracy and reliability of the proposed reformulation of the TCD was checked against a number of experimental results generated by testing, under different loading/strain rates, notched cylindrical samples of aluminium alloy 6063-T5, titanium alloy Ti–6Al–4V, aluminium alloy AlMg6, and an AlMn alloy. To further validate the proposed design method also different data sets taken from the literature were considered. Such an extensive validation exercise allowed us to prove that the proposed reformulation of the TCD is successful in predicting the dynamic strength of notched metallic materials, this approach proving to be capable of estimates falling within an error interval of ±20%. Such a high level of accuracy is certainly remarkable, especially in light of the fact that it was reached without the need for explicitly modelling the stress vs. strain dynamic behaviour of the investigated ductile metals.