黄金科学技术 ›› 2021, Vol. 29 ›› Issue (3): 411-420.doi: 10.11872/j.issn.1005-2518.2021.03.007
• 采选技术与矿山管理 • 上一篇
Jin HUANG(),Kewei LIU(),Shaohu JIN
摘要:
为了研究白麻花岗岩在高强度弹体中高速侵彻条件下的力学损伤响应,运用显式动力学有限元分析软件LS-DYNA,应用经SHPB试验验证的HJC材料模型,开展了弹头形状系数为3、直径为?20 mm、长径比为6的刚性弹体以不同初速度侵彻白麻花岗岩靶体的一系列数值模拟研究。同时,针对传统有限元方法难以解决材料大变形导致的网格畸变等问题,采用SPH-FEM耦合方法对靶体进行建模。通过改变弹体配置,研究了不同弹头形状对弹体侵彻性能的影响。模拟结果表明:SPH-FEM方法可以有效模拟岩石靶体受高速冲击的力学损伤响应。由不同撞击速度与侵彻深度的关系得到了有关白麻花岗岩侵彻深度的经验公式,其中侵彻深度与撞击速度呈正比,经验公式可用于相似强度岩体的侵彻深度预测。当初速度为50,100,150,200,250,300 m/s时,平头弹侵彻深度分别为卵形弹侵彻深度的16.7%、27.8%、35.1%、32.1%、36.1%和40.5%,平头弹的侵彻性能远低于卵形弹,且侵彻损伤区域较小。
中图分类号:
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