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Armox 560T钢
表2-121 *MAT_MODIFIED_JOHNSON_COOK模型参数
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/72_02.jpg?sign=1739279627-KXYkGsccqJ74toRcvmY3vvJUPsqSQOED-0-7637cf911af8477290669cd796ccc96d)
MICHAEL SALEH, LYNDON EDWARDS. Evaluation of a Hydrocode in Modelling NATO Threats against Steel Armour [C]. 25th International Symposium on Ballistics, Beijing, 2010.
文献作者获取了Armox 560T钢的Modified_Johnson_Cook材料模型参数,该模型不需要单独的状态方程,考虑了应变率效应和材料的破坏,其本构关系表达式为:
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/72_03.jpg?sign=1739279627-MasXCVBqyt25qvdpxxFl8bQ0SOB4K6Zb-0-45ae0b57d5862797b198ed1ca608cf6d)
绝热温升通过下式计算:
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/72_04.jpg?sign=1739279627-zmw99Udbn0cbSHh7meokVPZXHSucoC6n-0-aea898c4caf371c9f1298b649f3b5d32)
式中,χ是塑性功转化为热量的转化系数。
失效模型采用CL模型:
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/72_05.jpg?sign=1739279627-UnY0K1FFYEuq3HJLRuOkSLgOlb5vGIJK-0-32d6d9c3413993c0db156fefe4ec6d63)
除了CL失效准则外,还采用基于温度的失效准则:Tc=0.9Tm,即当材料温度达到熔化温度的90%时,就删除该单元。
表2-122 修正的Johnson-Cook模型参数
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/72_06.jpg?sign=1739279627-RczMZtIXZMn8AnFVvM3ba5QPvbA7vBwU-0-d3ffdaa0d8653f0df46b75a8f5ab0d21)
BΦRVIK T, S DEY, A H CLAUSEN. Perforation resistance of five different high-strength steel plates subjected to small-arms projectiles [J]. International Journal of Impact Engineering, 2009. 36(7):948-964.