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采用细观力学方法研究了正交铺设SiC/CAS复合材料在单轴拉伸载荷作用下界面脱粘对基体开裂的影响。采用断裂力学界面脱粘准则确定了0°铺层纤维/基体界面脱粘长度,结合能量平衡法得到了主裂纹且纤维/基体界面发生脱粘(即模式3)和次裂纹且纤维/基体界面发生脱粘(即模式5)的临界开裂应力,讨论了纤维/基体界面剪应力、界面脱粘能对基体开裂应力的影响。结果表明,模式3和模式5的基体开裂应力随纤维/基体界面剪应力、界面脱粘能的增加而增加。将这一结果与Chiang考虑界面脱粘对单向纤维增强陶瓷基复合材料初始基体开裂影响的试验研究结果进行对比表明,该变化趋势与单向SiC增强玻璃陶瓷基复合材料的试验研究结果一致。
The effect of interfacial debonding on the cracking of the matrix under uniaxial tensile loading was studied by using meso-mechanics method. The debonding length of 0 ° lay fiber / matrix interface was determined by the interface debonding criterion of fracture mechanics, the main crack was obtained by the energy balance method and the debonding (mode 3) and secondary crack occurred at the fiber / matrix interface and the fiber / matrix interface The critical cracking stress of debonding (Mode 5) occurred. The influence of shear stress on the interface between fiber / matrix and the debonding of the matrix was discussed. The results show that the cracking stress of the matrix in mode 3 and mode 5 increases with the increase of the interfacial debonding energy at the fiber / matrix interface. Comparing this result with that of Chiang’s experimental study on debonding the uniaxial interface of unidirectional fiber reinforced ceramic matrix composites shows that the trend is consistent with the experimental results of unidirectional SiC reinforced glass-ceramic matrix composites.