2.5维自愈合C/SiC复合材料的拉伸应力-应变关系

根据2.5维自愈合C/SiC复合材料的细观结构特点,基于界面开裂和基体开裂的损伤机理,分别建立了该材料经向和纬向拉伸的细观力学模型,进而得到了经向和纬向拉伸的非线性应力-应变关系,应力-应变曲线的预测结果与试验值吻合较好.结果表明:纬向应力-应变曲线的最大预测误差为9%,经向应力-应变曲线的最大预测误差约为10%,经向和纬向的应力-应变关系不同.该模型采用切线弹性模量和平均裂纹间距的方法,省去了以往模型复杂的应变计算过程,使模型得到简化,便于应用.

Tensile stress-strain behavior of 2.5-D self-healing C/SiC composite

According to the micro-structure of 2.5-D self-healing C/SiC composite, a tensile mechanical model in weft and warp directions were established based on the damage mechanism including interfacial crack and matrix crack. The tensile nonlinear stress-strain functions in weft and warp directions were gained, and the predicted stress-strain curve agreed with the experiment very well. The result shows that,the largest error of the predicted stress-strain curve in weft direction is 8% to 9%. The largest error of the predicted stress-strain curve in warp direction is 10%. The stress-strain curve in weft direction is different from that in warp direction. By adopting tangent elasticity modulus and average crack distance, mass work to obtain strain is not needed and the model is simplified.