PBX炸药损伤本构模型及其工程运用

为了对高聚物黏结炸药(PBX)在动态冲击载荷下可能产生的损伤进行研究,采用分离式霍普金森杆(SHPB)试验装置获得了PBX炸药材料在不同应变率条件下出现力学损伤的本构曲线,并基于含损伤变量的Z?W?T本构模型对本构曲线进行了分段拟合.然后基于拟合结果、有限元理论、弹塑性力学与ABAQUS/VUMAT语法编写了PBX炸药...

Damage Constitutive Model of PBX Explosive and Its Engineering Application

In order to study the damage of polymer bonded explosive(PBX)under dynamic shock loads,the constitutive curve of the mechanical damage of PBX under different strain rates was obtained by using the Split?Hopkinson pressure bar(SHPB)test device.And the constitutive parameters in the Z?W?T constitutive model with damage variables were fitted in sections.Then,based on the fitting results,the finite element theory,elastoplastic mechanics and ABAQUS/VUMAT,the subroutine of PBX containing damage is completed,and is verified by the finite element simulation.The model is used for finite element engineering exam?ples.Results show that the verification results of finite element samples are in good agreement with the experimental results,and the correlation degree of the results is higher than 0.95.The stress cloud diagram and damage variable cloud diagram for fragment penetration example reflect the change and possible damage location of PBX under shock loads.The evolution process of damage cloud diagram reflects the correlation between damage evolution and strain rate effect of PBX.