固体推进剂中的裂纹扩展起始的数值分析(英文)

Numerical Analysis of Initiation of Crack Extension in Solid Propellant

研究了含有裂纹和星孔的复合固体推进剂正交板的断裂问题。基于有限元软件ABAQUS,将固体推进剂当作粘弹性材料,沿着试件的上下表面施加均布位移载荷,利用 J-积分法对含硬颗粒的橡胶基复合固体推进剂进行了非线性大变形仿真计算,详细分析了裂尖附近的局部力学行为和裂纹成长行为。将应变能密度理论与应力分析的结果相耦合,预测了裂纹起始与裂尖到星孔距离之间的关系。

The problem of the fracture of composite solid propellant orthogonal plate containing cracks and star holes was studied. The solid propellant was taken as viscoelastic materials, and the average force was loaded along displacement on both upper and lower surfaces. The method of J-integral was used to simulate the nonlinea large-deformation of rubbery matrix composite solid propellant containing hard particles. Partial mechanical properties and crack growth behavior were analyzed in detail near to crack tip, based on the finite-element software ABAQUS. The results of stress analysis were coupled with the strain energy density theory to predict the relationship between the initiation of crack growth and the distance from the crack tip to the star hole.