Z-pins增强陶瓷基复合材料层间Ⅰ型开裂性能预测

基于Z-pins增强陶瓷基复合材料层间Ⅰ型断裂韧性的试验结果、Z-pins增强机理，提出了Z-pins拔出的单线性软化模型.重点考虑了Z-pins直径范围内拔出位移的不一致性，在简单双悬臂梁（DCB）理论的基础上，获得了Z-pins增强陶瓷基复合材料层间Ⅰ型开裂性能的分析预测模型，预测结果与试验结果吻合较好.在此基础上，采用预测模型获得了不同Z-pins直径、裂纹长度下的裂尖能量释放率，并与理想弹簧元法进行了比较.结果表明:当裂尖靠近Z-pins时，随着Z-pins直径增大，两种方法所得的裂尖能释放率的差异逐渐增大，但总体来说差异的量级很小；随着裂纹长度的增加，裂尖逐渐远离Z-pins，两种方法所得的裂尖能释放率的存在较大的差异，不能忽略Z-pins直径范围内拔出位移不一的影响. 

Prediction of model Ⅰ interlaminar fracture performance for Z-pins reinforced ceramic matrix composites

Based on the experimental results and toughening mechanism of model Ⅰ interlaminar fracture toughness for Z-pins reinforced ceramic matrix composites,a simple pullout model of Z-pins was proposed.The inconsistency of pullout displacement in the scale of Z-pins' diameter was considered carefully,prediction model of model Ⅰ interlaminar fracture performance for Z-pins reinforced ceramic matrix composites was obtained by means of the simple double cantilever beam (DCB) theory,and the predicted results were in good agreement with the experiments.Using this analysis as a foundation,the effect on crack tips' energy release rate with different Z-pins' diameters and crack lengths was studied,and then compared with the method of spring element.Results show that with the increase of diameters,the differences of energy release rate at crack tip gradually increase by two methods,but the difference is relatively small when crack tip is close to Z-pins;however,with the increase of crack lengths,there is a big difference in the two methods' energy release rate at crack tip,the inconsistency of pullout displacement in the scale of Z-pins' diameter can't be ignored.