修正时间硬化理论的PBX蠕变模型及其应用

利用基于修正时间硬化理论的蠕变模型来模拟炸药部件的短时蠕变行为。以HMX基PBX的15次单轴压缩蠕变实验数据确定了15组模型参数,抽取3组利用ANSYS软件进行模拟实验来验证模型。根据正态分布小概率原理最终确定了通用的蠕变模型参数。应用获得的蠕变模型对真空吸附作用下的该型PBX部件进行蠕变仿真,获得其在1h内的蠕变变形。理论分析和数值模拟结果表明,该模型能很好地描述HMX基PBX的蠕变特性,可以运用于机械加工过程中炸药部件受夹持力作用的短时蠕变仿真。

Creep Model of PBX Based on Modified Time Hardening Theory and its Application

A creep model based on modified time hardening theory is promoted to simulate the short duration creep behavior of PBX components. 15 groups model parameters are determined by using data from 15 uniaxial compressive creep tests of a type of PBX based on HMX. Simulated parameters of 3 groups are used to build an initial creep model which is validated by ANSYS simulation software. The universal parameters of the creep model are determined based on the principle of little probability event of assumed normal probability distribution. The creep model is employed in simulating the creep deformation of a HMX based PBX components subjected to vaesorb forces in one hour. The results from numerical simulation and theoretical analysis show that the modified time hardening creep model is suitable for short duration creep behavior of PBX.