界面对纤维增强陶瓷基复合材料拉伸性能的影响
Effects of interface on tensile properties of fiber reinforced ceramic matrix composites
-
摘要: 建立了桥联纤维细观力学模型, 研究了界面对纤维增强陶瓷基复合材料拉伸模量及强度的影响。分别引入纤维应力均匀系数和界面脱粘率作为界面完全脱粘和局部脱粘条件下界面性能的表征参数。研究表明, 应力均匀系数及界面脱粘率越大, 材料模量越低, 而断裂时纤维所承担的应力越高。基于混合率给出了拉伸强度表达式, 同时也分析了基体裂纹分布、界面脱粘和纤维拔出对强度的影响。计算结果表明, 本文强度模型给出的预测值与试验值吻合较好。Abstract: A micromechanics based model of bridging fibers was established to study the effects of interface on the tensile modulus and strength of the fiber reinforced ceramic matrix composites. The coefficients of fiber stress uniformity and interface debonding rate were int roduced to characterize the property of the interface with complete debonding and partial debonding, respectively. The result indicates that the higher the coefficients, the lower the modulus while the higher the stress carried by the fibers when the composites fracture. Based on the rule of mixtures, a new strength calculation model was presented. The effects of matrix crack distribution, interface debonding and fiber pullout on the tensile strength were discussed. The results predicted by the model are in good agreement with the experimental data.
-
Key words:
- ceramic matrix composites /
- interface debonding /
- micromechanics /
- crack distribution /
- tensile strength
点击查看大图
计量
- 文章访问数: 2068
- PDF下载量: 1386
- 被引次数: 0