摘要
为研究重复侵彻下花岗岩靶板的动力响应,运用非线性动力分析软件AUTODYN并基于FEM-SPH耦合算法开展花岗岩的侵彻模拟.首先,通过理论分析初步确定出JH-2模型参数;然后,根据花岗岩单次侵彻实验的模拟结果对参数进行调整优化;最后,在220 m/s≤V s≤420 m/s弹速下,采用优化后的参数对花岗岩的重复侵彻过程进行模拟分析.结果表明:JH-2模型与拉伸断裂软化模型相耦合,能够弥补JH-2模型在描述岩石低应力区由主拉伸应力作用所产生的动力响应方面的不足;花岗岩靶板初次侵彻时形成的“锥形开坑区+隧道区”破坏模式为后续的重复稳定侵彻提供了必要条件;随冲击次数的增加,绝对侵彻深度逐渐增大而每次的相对侵彻深度则呈减小趋势,且冲击次数越多或冲击速度越高,弹体侵彻过程越稳定.此外,本文所提出相对侵彻系数概念以及基于冲击次数和弹速的重复侵彻深度的理论公式均具有一定实用价值.
To investigate the dynamic response of granite target plate under repeated penetration,the nonlinear dynamic software AUTODYN along with the FEM-SPH coupling algorithm was used to simulate granite penetration.First,JH-2 model parameters were preliminarily determined through theoretical analysis.Then,the parameters were adjusted and optimized according to the simulation results of single penetration experiment of granite.Finally,under the projectile velocity of 220 m/s≤V s≤420 m/s,the repeated penetration of granite was simulated and analyzed by using the optimized parameters.Results show that the JH-2 model coupled with tensile fracture softening model could make up for the deficiency of the JH-2 model in describing the dynamic response of rocks in low stress zone due to the action of main tensile stress.The failure mode of“conical crater+tunnel”formed during the initial penetration of the granite target plate provided a prerequisite for the subsequent repeated and stable penetration.With increasing impact times,the absolute penetration depth gradually increased,while the relative penetration depth decreased.The higher the impact times or impact velocity was,the more stable the penetration process of the projectile was.In addition,the concept of relative penetration coefficient and the theoretical formula of repeated penetration depth based on impact times and projectile velocity were given,both of which have certain practical values.
作者
王志亮
李允忠
黄佑鹏
WANG Zhiliang;LI Yunzhong;HUANG Youpeng(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2020年第11期127-136,共10页
Journal of Harbin Institute of Technology
基金
国家自然科学基金(U1965101,51579062)。
