固体火箭发动机滚动球窝喷管弹塑性摩擦接触承载性能分析

固体火箭发动机滚动球窝喷管的弹塑性摩擦接触承载性能，属于复杂结构在复杂载荷作用下的弹塑性摩擦接触问题，它直接决定着系统的结构设计和功能发挥。为保证系统在承受极端工作载荷时，喷管不产生大的轴向位移，阴球、阳球与滚动体间具有一定的接触强度，同时不产生过量的塑性变形，设计阶段，基于计算精度高的三维摩擦接触问题的Lagrange乘子法，解决了与弹塑性耦合的算法问题；在滚动体运动分析及摩擦测试的基础上，模拟系统冷试车冲压试验，充分考虑材料表面强化层，建立了各构件间的弹塑性摩擦接触模型。有限元计算结果及冷试车分解试验、系统作动力矩测试试验结果表明，系统弹塑性摩擦接触承载性能满足结构设计要求，有限元建模及计算结果正确。

Elasto-plastic friction contact load-bearing performance analysis for rolling ball joint socket nozzle in a certain solid propellant rocket motor

The contact load-bearing performance of elastic-plastic friction for rolling ball joint socket nozzle solid propellant rocket motor is elastic-plastic friction contact problem of complex structures under complex loads,and it directly determines the structure design and functioning of system.In order to ensure that the system to withstand the extreme working load,the nozzle does not produce a large axial displacement,there must be certain contact strength between the concave-convex spheres and rolling element,meanwhile does not produce excessive plastic deformation.In design stage,we solve the problem of elastic-plastic coupling algorithm on the basis of Lagrange multiplier method for the three-dimensional friction contact problem of high precision in calculation.We simulate the pendulous test on the basis of the rolling body movement analysis and frictional test,and we establish the elastic-plastic friction contact model in full consideration to surface strengthening layer.The finite element results,the pendulous decomposition test results and test results of system driving moment show that the elastic-plastic friction contact load-bearing performance of system to meet the structural design requirements; the result of finite element modeling and calculation are correct.