固体推进剂/衬层粘接界面脱粘失效的数值模拟

基于SEM(scanning electron microscope)得到的细观形貌和颗粒分布建立了复合固体推进剂/衬层细观有限元模型。使用Cohesive单元来模拟复合固体推进剂基体/颗粒界面和复合固体推进剂/衬层界面的脱粘。计算分析了单轴准静态拉伸作用下复合固体推进剂/衬层界面处不同颗粒含量和不同强化/老化程度对脱粘过程的影响。计算结果表明,衬层界面的老化和颗粒数量的增加都会导致衬层界面更容易脱粘失效,失效应变随推进剂/衬层界面处颗粒含量的增加而增大,而峰值应力先减小而后增大。峰值应力和失效应变随衬层老化而减小,但对衬层界面强化不敏感。

Numerical Simulation of Debonding of Solid Propellant/Liner Interface

A composite solid propellant/liner microscopic finite element model was established based on the microscopic morphology and particle distribution obtained by SEM (scanning electron microscope). Using Cohesive unit to simulate the composite solid propellant matrix/particle interface and composite solid propellant/liner interface debonding. The effects of different particle content and strengthening/aging degree on the debonding process of composite solid propellant/liner interface under uniaxial quasi-static tension were calculated and analyzed. The results show that the aged of the liner interface and the increase of the number of particles will lead to the debonding failure of the liner interface. The failure strain increases with the increase of the particle content at the propellant/liner interface, while the peak stress decreases first and then increases.The peak stress and failure strain decrease with the aging of liner, but they are not sensitive to the strengthening of liner interface.