基于动态本构模型的整流罩铰链系统自冲击分析

整流罩铰链系统结构分析是大型整流罩分离分析的重要环节,也是国内新一代运载火箭研制过程中的关键技术之一。基于30CrMnSiA和ZTC4-1的力学性能试验研究,得到材料的动态本构模型,并建立整流罩及动态本构模型下的铰链系统有限元模型。通过非线性显式动力学分析方法,对铰链系统自冲击过程进行仿真,得到冲击作用下铰链系统的应力和应变情况,并通过内力分析得到自冲击过程中铰链系统的主要内力形式。最后,通过比较铰链系统动态本构与准静态本构下的自冲击响应,验证并说明了动态本构模型对铰链系统自冲击仿真的影响。计算结果表明,自冲击作用会使铰链系统发生塑性变形,且动态本构模型有利于反映真实结果,为新一代运载火箭的研制提供一定的参考价值。

Self-impact analysis of the fairing hinge system based on dynamic constitutive models

Structural analysis of the hinge system plays an important part in the large-scale payload fairing separation analysis,which is one of the key technologies during the development of new generation launch vehicles.In this paper,the dynamic constitutive models of mechanical properties of 30CrMnSiA and ZTC4-1 are obtained based on experimental study and then the finite element models of payload fairing and the hinge system with the dynamic constitutive models are established.Based on the nonlinear explicit dynamic methods,the self-impact process of the hinge system is simulated,and the stress and strain of the hinge system under the impact effect are obtained.The major internal forces of the hinge system in the self-impact process are obtained by internal force analysis.Finally,by comparing the self-impact responses of the hinge system with dynamic and quasi-static constitutive models,it is well illustrated that the dynamic constitutive model influences the simulation results.Results indicate that the self-impact effect could make the hinge system deform plastically.Moreover,the dynamic constitutive model is conducive to reflecting the reality,which provides a basis for the development of new generation launch vehicles.