【摘要】：基于Z-pins增強陶瓷基復合材料層間Ⅰ型斷裂韌性的試驗結果、Z-pins增強機理,提出了Zpins拔出的單線性軟化模型.重點考慮了Z-pins直徑范圍內(nèi)拔出位移的不一致性,在簡單雙懸臂梁(DCB)理論的基礎上,獲得了Z-pins增強陶瓷基復合材料層間Ⅰ型開裂性能的分析預測模型,預測結果與試驗結果吻合較好.在此基礎上,采用預測模型獲得了不同Z-pins直徑、裂紋長度下的裂尖能量釋放率,并與理想彈簧元法進行了比較.結果表明:當裂尖靠近Z-pins時,隨著Z-pins直徑增大,兩種方法所得的裂尖能釋放率的差異逐漸增大,但總體來說差異的量級很小;隨著裂紋長度的增加,裂尖逐漸遠離Z-pins,兩種方法所得的裂尖能釋放率的存在較大的差異,不能忽略Z-pins直徑范圍內(nèi)拔出位移不一的影響.
[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.
【作者單位】： 中國航天科工集團公司北京空天技術研究所;
【分類號】：TB332

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