论文部分内容阅读
为了准确反映改性双基推进剂装药在高过载发射条件下的破坏情况,采用基于含累积损伤的非线性粘弹性本构模型,利用ABAQUS有限元软件二次开发的UMAT子程序,对某型火箭弹在过载发射情况下的装药进行了数值研究,分析了装药在高过载条件下的变形行为和力学特性。结果显示,在最大加速度为1.39×104g的高过载下,最大应力发生在装药底部内孔处;装药径向尺寸变化很小,可以忽略发动机壳体对装药外表面的约束而将其视为自由表面。比较了最大应力强度准则和累积损伤准则对装药在加速度冲击和压强端面冲击载荷下破坏的判断,两种判据的结果都表明,装药在高过载冲击载荷下没有被破坏。
In order to accurately reflect the damage of the modified double-base propellant charge under high overload emission conditions, a nonlinear viscoelastic constitutive model based on cumulative damage and a UMAT subroutine developed by ABAQUS finite element software were used to simulate the Type rocket charge in the case of overload launch a numerical study of the charge under high overload conditions the deformation behavior and mechanical properties. The results show that under the maximum overload of 1.39 × 104g, the maximum stress occurs at the bottom hole of the charge. The change of the radial size of the charge is very small. Ignoring the constraint of the engine shell on the external surface of the charge, As a free surface. The maximum stress intensity criterion and the cumulative damage criterion are compared to determine the damage of the charge under the acceleration impact and the pressure end impact load. The results of both criteria show that the charge is not damaged under high overload impact load.