Z-pins增强陶瓷基复合材料层间Ⅰ型开裂性能预测
发布时间：2018-11-03 13:10
【摘要】：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Zpins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.
[Abstract]:Based on the experimental results of interlaminar mode I fracture toughness of Z-pins reinforced ceramic matrix composites and the strengthening mechanism of Z-pins, a single linear softening model for Zpins pull-out is proposed. The inconsistency of pull-out displacement in the Z-pins diameter range is considered. Based on the simple (DCB) theory of double cantilever beam, the model of predicting the interlaminar cracking properties of Z-pins reinforced ceramic matrix composites is obtained. The predicted results are in good agreement with the experimental results. On this basis, the energy release rates of crack tip under different Z-pins diameters and crack lengths are obtained by using the prediction model and compared with the ideal spring element method. The results show that when the crack tip is near Z-pins, the difference of energy release rate between the two methods increases with the increase of Z-pins diameter, but the magnitude of the difference is very small. With the increase of crack length, the crack tip is gradually away from Z-pins. There is a great difference in the energy release rate between the two methods, and the effect of different pull-out displacement in the Z-pins diameter range can not be ignored.
【作者单位】： 中国航天科工集团公司北京空天技术研究所;
【分类号】：TB332
[Abstract]:Based on the experimental results of interlaminar mode I fracture toughness of Z-pins reinforced ceramic matrix composites and the strengthening mechanism of Z-pins, a single linear softening model for Zpins pull-out is proposed. The inconsistency of pull-out displacement in the Z-pins diameter range is considered. Based on the simple (DCB) theory of double cantilever beam, the model of predicting the interlaminar cracking properties of Z-pins reinforced ceramic matrix composites is obtained. The predicted results are in good agreement with the experimental results. On this basis, the energy release rates of crack tip under different Z-pins diameters and crack lengths are obtained by using the prediction model and compared with the ideal spring element method. The results show that when the crack tip is near Z-pins, the difference of energy release rate between the two methods increases with the increase of Z-pins diameter, but the magnitude of the difference is very small. With the increase of crack length, the crack tip is gradually away from Z-pins. There is a great difference in the energy release rate between the two methods, and the effect of different pull-out displacement in the Z-pins diameter range can not be ignored.
【作者单位】： 中国航天科工集团公司北京空天技术研究所;
【分类号】：TB332
【相似文献】
相关期刊论文 前10条
1 黄德中;;陶瓷基复合材料的研究现状及在发动机上的应用展望[J];农业机械学报;2006年11期
2 刘t，
本文编号：2307879
本文链接：https://www.wllwen.com/kejilunwen/cailiaohuaxuelunwen/2307879.html
