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Weldox 700E钢
表2-270 Johnson-Cook模型参数
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/106_05.jpg?sign=1734409329-P5B4UVEkHwg3Gp83vLyToRRfjEKzCvr0-0-419798446eae33dea82739dce3a5c746)
S DEY, T BØRVIK, O S HOPPERSTAD, et al. The effect of target strength on the perforation of steel plates using three different projectile nose shapes [J]. International Journal of Impact Engineering, 2004, 30:1005-1038.
文献作者获取了Weldox 700E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/106_06.jpg?sign=1734409329-ZFoGw9FPlVz23c2yqJBelkKcUk43wKdi-0-c10c547009bc2b395ef3dc292da93bff)
绝热温升通过下式计算:
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/107_01.jpg?sign=1734409329-a1Ptbhe9xjTU48kQswUbERqxLC4yPASW-0-3002e549b2b7994411953e348b690b35)
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/107_02.jpg?sign=1734409329-g7VULRB6DODMt9aXy4qLwKHij4kf9ZVN-0-8c01f1ce60500087882739fa76b55e2a)
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2-271 Modified_Johnson_Cook材料模型参数
![](https://epubservercos.yuewen.com/CBD420/17977545008662006/epubprivate/OEBPS/Images/107_03.jpg?sign=1734409329-VAAm3g1Dnk4hezYq0Nj0A0fgvIZWk7SA-0-25b0420a2a43eaa971c309126b6502f8)
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.