绝热剪切效应对背水靶板的抗侵彻特性影响的研究（英文）

发布时间：2018-06-20 20:34

本文选题：绝热剪切 + 背水靶板　；参考：《船舶力学》2017年03期

【摘要】：绝热剪切效应是材料破坏的重要机理之一。文章开展了动态冲击作用下的材料绝热剪切试验,计算了绝热条件下材料的塑性温度升高。建立了背水靶板的FEM全流固耦合模型,采用考虑了温度效应的Johnson-cook模型开展了爆炸破片侵彻舰船液舱舱壁过程的计算。结果表明:(1)材料在高应变率下的绝热温升不可忽略;(2)弹体侵彻背水靶板过程可分为4个典型阶段,分别为墩粗凿坑阶段、碰撞形成速度共同体阶段、绝热剪切阶段和扰动液体阶段;(3)考虑温度效应的剩余速度明显小于不考虑温度效应的剩余速度;速度较低时,是否考虑温度效应预测的剩余速度值差异较小,随着初始速度的增大,差异逐渐增大。
[Abstract]:Adiabatic shear effect is one of the important mechanisms of material failure. In this paper, the adiabatic shear test of the material under dynamic impact is carried out, and the plastic temperature rise of the material under adiabatic condition is calculated. The FEM full fluid-structure coupling model of backwater target plate is established. The Johnson-cook model considering temperature effect is used to calculate the penetration process of explosive fragments into ship tank bulkhead. The results show that the adiabatic temperature rise of the material at high strain rate can not be ignored. The penetration process of the projectile into the backwater target can be divided into four typical stages: the crater stage and the velocity community stage. In adiabatic shear stage and disturbed liquid phase, the residual velocity considering temperature effect is obviously smaller than that without temperature effect, and when the velocity is low, the difference between the predicted residual velocity values of temperature effect and that of temperature effect is small. With the increase of initial velocity, the difference increases gradually.
【作者单位】：武汉理工大学交通学院;
【基金】：Supported by the Natural Science Foundation of China(No.51408450) the Fundamental Research Funds for the Central Universities(No.2014-yb-20) the open fund of the State Key Laboratory of Nonlinear Mechanics(LNM201505)~~
【分类号】：O385

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