针对火工分离螺母分离过程的动力学响应预测问题,采用数值方法研究了分离螺母火工分离过程.建立了分螺母结构有限元模型并对接触关系进行了设置,采用JWL方程模拟炸药的初始压强,采用拉格朗日-欧拉耦合采用一般耦合法进行耦合分析,基于Dytran采用显式动力学分析方法对分离螺母的分离过程进行了数值仿真,对不同观测点的加速度响应进行了冲击响应谱分析.结果表明,数值仿真方法能够有效模拟分离螺母的分离过程,由于结构阻尼作用远点响应小于近点冲击响应,变参分析表明火药量对结构冲击响应有重要影响,结构外壳材料对冲击响应影响有限.%In order to forecast the dynamic response during the separation process of the separation nut, the pyrotechnic separation process of a typical separation nut was analyzed by numerical simula-tion. The finite-element-method ( FEM ) model was established and the contact relationships of structures were set up. The initial pressure of the explosion process was simulated by the JWL equa-tion. The coupled relationship between the Lagrange mesh and the Euler mesh was simulated by the general coupled method. The explicit dynamic simulation method was carried out to analyze the sep-aration process by Dytran software. The shock response spectrum ( SRS) at different measurement points was investigated. The results showed that the separation process of the separation nut was sim-ulated precisely by the numerical method. The SRS of the far-point was higher than that of the near-point due to the structural damping. The amount of the explosive had an important impact to the SRS and the materials of the shell structure had a minor influence.
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