复合固体推进剂非线性界面脱粘的力学性能研究

Research on Mechanics Performance of Composite Propellant with Nonlinear Interface Debonding

复合固体推进剂是高体积分数的颗粒填充材料,因此建立细观力学模型对于研究其力学性能具有十分重要意义。应用细观力学的Mori-Tanaka方法研究了推进剂本构关系,其中推进剂颗粒与基体的界面粘接律采用抛物线型假设。通过算例证明抛物线型粘接律能更好模拟推进剂颗粒与基体的非线性脱粘行为,并且研究表明推进剂中颗粒大小、体积分数以及颗粒基体界面间的最大粘接应力对其力学性能有明显影响。

The composite propellant with high particle volume fraction is made up of the matrix and the particle. It is of great importance to establish micromechanics model of the composite propellant. The Mort-Tanaka method was used to study the effect of nonlinear interface debonding on the constitutive behavior of composite propellant. The cohesive law of the particle and matrix was based on the model of parabola. According to result analysis, it is found that the model of parabola better simulates the behaviors of debonding of the matrix and the particle. It is also found that the composite propellant with different particle size, different volume fraction and the max stress of the particle and matrix may leads to very different macroscopic behaviors.