复合推进剂的细观失效机理分析

Analysis on micro-mechanical failure mechanisms of composit e propellant

建立了颗粒填充复合推进剂的细观有限元模型,计算了颗粒与基体粘结完好和存在脱粘两种情况下颗粒与基体内的应力分布,分析了复合推进剂的细观失效机理。结果表明,在细观结构下,复合推进剂中的应力分布是不均匀的,推进剂一般首先在极区产生脱粘,颗粒的大小对推进剂的力学性能有较大影响。

A micro-mechanical finite element model of particle-filled composite propellant was derived, and the stress distribu tions in the different constituents of composite propellant with perfectly bonded interface and with an interfacial crack were calculated. Then failure mechanisms of composite propellant were analyzed. The results show that the stresses are inhomogeneous in the composite propellant and debonding cracks are usually generated in the pole of propellant. The particle size has great effect on the mechanical properties of propellant.