基于CRKSPH的炸药巴西压裂仿真研究  

Simulation of the brazilian splitting behavior of explosives based on CRKSPH

作　　者：郭支明[1] 秦栋泽[1] 贾宪振[2] GUO Zhiming;QIN Dongze;JIA Xianzhen(North University of China,Taiyuan 030051,China;Xi'an Modern Chemistry Research Institute,Xi'an 710065,China)

机构地区：[1]中北大学,太原030051 [2]西安近代化学研究所,西安710065

出　　处：《固体火箭技术》2021年第5期607-613,共7页Journal of Solid Rocket Technology

基　　金：西安近代化学研究所重点实验室基金项目。

摘　　要：使用守恒型再生核粒子(CRKSPH)方法,结合弹脆性损伤本构模型,对PBX9501炸药标准巴西试验断裂过程进行了仿真,并对炸药内裂纹的产生和分布进行了预测。计算中,使用CRKSPH方法,可有效地提高计算精度和避免人工粘性误差;本构模型基于PBX9501炸药材料细观结构特征和破坏模式,并使用损伤参数D(单位面积上微缺陷的密度)来表征材料的破坏程度;计算结果中,试件断裂形式和中心点应力结果与文献中试验结果符合较好,而且加载速率对试件的断裂形式和断裂时间均有一定的影响。研究表明,CRKSPH方法在计算PBX9501炸药断裂损伤及裂纹扩展问题上有一定的工程实用价值。The fracture process of PBX9501 explosive in the standard Brazilian tests was simulated by using the conservative Reproducing Kernel smoothed particle Hydrodynamics(CRKSPH)method and the elastic-brittle damage constitutive model.The occurrence and distribution of cracks in the PBX9501 explosive were also predicted.The calculation accuracy was effectively improved and the artificial viscosity errors was avoided by CRKSPH methods.Based on the meso-structure characteristics and failure modes of PBX9501,the constitutive model was developed.The damage parameter D(density of micro defects per unit area)was used to evaluate the destructiveness.The calculation results show that the fracture mode and the stress at the center point coincide well with literatures;furthermore,the fracture forms and fracture times are affected by the loading rate.The CRKSPH methods would have engineering practical value in simulating the fracture damage and crack propagation of PBX9501 explosives.

关 键 词：CRKSPH 损伤断裂 PBX9501 本构模型 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O389[理学—流体力学]