某高过载干扰弹头结构强度仿真分析方法研究

Research on Structure Strength Simulation Analysis Methods of a Jamming Warhead Under High Acceleration Conditions

针对某干扰弹头在高过载下结构易断裂问题,研究惯性释放和限制约束条件两种方法对弹头结构在高载荷下强度分析的差异性。本文基于ANSYS静力学模块,建立力学模型,根据某干扰弹头从发射到出炮口的运动状态,分别采用惯性释放和限制约束条件方法,对结构进行力学分析。研究结果表明:采用约束条件方法得到最大应力值为1160.7MPa,最大位移为1.156mm。采用惯性释放法得到的最大应力值为2617.2MPa,最大位移为0.632mm。且应力集中处的位置和大小有较大区别,越靠近约束面应力越集中。试验结果表明,惯性释放方法针对刚体运动的弹壳体承受高过载问题仿真结果更准确,分析方法更合理,符合实际情况。

A jamming warhead is fragile under high acceleration conditions.In this paper,the performance difference of the inertial relief method and constraint condition method in structure strength analysis of the warhead under high acceleration conditions is researched.A mechanical model is established based on the ANSYS statics module.And then the inertial relief method and constraint condition method are used respectively to carry out mechanical analysis of the warhead structure based on the motion states of the warhead from launching to departing the gun muzzle.Analysis using the constraint condition method shows a maximum stress of 1160.7 MPa and a maximum displacement of 1.156 mm.Analysis using the inertial relief method shows a maximum stress of 2617.2 MPa and a maximum displacement of 0.632 mm.In addition,analysis using the constraint condition method shows non-uniform stress distribution.To be specific,closer to the constraint surface,more concentrated the stress.Test results show that the inertial relief method has higher simulation analysis accuracy for the warhead under rigid motion and high acceleration conditions.