基于孔隙演化的砂土冲击绝热关系研究
发布时间：2019-06-27 16:46
【摘要】：基于砂土多孔、含水的特性,对动载荷作用下孔隙演化对砂土冲击绝热关系的影响进行了研究。基于砂土基体的不可压缩假设,采用单个球形气孔等效模型和广义Mises屈服准则推导了砂土考虑孔隙压实的演化方程;根据冲击Hugoniot突跃条件和Grüneisen型方程,获得了砂土考虑孔隙演化的状态方程;根据混合物冲击波关系和孔隙演化状态方程,获得了砂土基体材料冲击绝热关系、干砂土和湿砂土冲击绝热关系,并与已有实验结果进行了对比。结果表明:计算得到的绝热线与实验数据吻合较好,该孔隙演化状态方程能够较为准确的反映动载作用下砂土的动态响应过程。
[Abstract]:Based on the characteristics of porous and water-bearing sand, the influence of pore evolution on the impact insulation relationship of sand under dynamic load is studied. Based on the incompressibility assumption of sand matrix, the evolution equation of sand considering pore compaction is derived by using the equivalent model of single spherical pore and the generalized Mises yield criterion, and the equation of state of sand considering pore evolution is obtained according to the shock Hugoniot jump condition and Gr 眉 neisen type equation. According to the shock wave relationship of the mixture and the equation of state of pore evolution, the impact insulation relationship of sand matrix material and the impact insulation relationship between dry sand and wet sand are obtained and compared with the existing experimental results. The results show that the calculated absolute hot line is in good agreement with the experimental data, and the equation of state of pore evolution can accurately reflect the dynamic response process of sand under dynamic load.
【作者单位】： 南京理工大学智能弹药国防重点学科实验室;解放军理工大学爆炸冲击防灾减灾国家重点实验室;
【基金】：国家自然科学基金面上项目(51478466);国家自然科学基金青年项目(51508568) 爆炸科学与技术国家重点实验室开放基金项目(KFJJ15-07M)
【分类号】：O34
，
本文编号：2506975
[Abstract]:Based on the characteristics of porous and water-bearing sand, the influence of pore evolution on the impact insulation relationship of sand under dynamic load is studied. Based on the incompressibility assumption of sand matrix, the evolution equation of sand considering pore compaction is derived by using the equivalent model of single spherical pore and the generalized Mises yield criterion, and the equation of state of sand considering pore evolution is obtained according to the shock Hugoniot jump condition and Gr 眉 neisen type equation. According to the shock wave relationship of the mixture and the equation of state of pore evolution, the impact insulation relationship of sand matrix material and the impact insulation relationship between dry sand and wet sand are obtained and compared with the existing experimental results. The results show that the calculated absolute hot line is in good agreement with the experimental data, and the equation of state of pore evolution can accurately reflect the dynamic response process of sand under dynamic load.
【作者单位】： 南京理工大学智能弹药国防重点学科实验室;解放军理工大学爆炸冲击防灾减灾国家重点实验室;
【基金】：国家自然科学基金面上项目(51478466);国家自然科学基金青年项目(51508568) 爆炸科学与技术国家重点实验室开放基金项目(KFJJ15-07M)
【分类号】：O34
，
本文编号：2506975
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