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Effect of interfacial properties on nonlinear behavior of the 4D in-plane braided C/C composites

机译：界面性质对4D面内编织C / C复合材料的非线性行为的影响

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In order to investigate the effect of interfacial properties on the tensile behavior of the four-directional (4D) in-plane braided C/C composites, a nonlinear finite element model is proposed, and the Cohesive Zone Model (CZM) is used to evaluate the debonding behavior of interface between yarn and matrix in the model. Taking account of interface damage mode and several damage modes of yarns and matrix in the braided composites, the damage initiation and failure process is simulated and the tensile modulus and strength of the material are predicted and compared with the experimental results. The effect of the interfacial properties on the stress-strain curves is parametrically studied. The numerical results show that the interfacial modulus produces an obvious effect on the tensile modulus of the material, and the interfacial damage controlled by interfacial strength is one of critical factor causing the nonlinear behavior of the tensile stress-strain curves.
机译：为了探讨界面性质对四方向（4D）在面内编织的C / C复合材料的拉伸行为的影响，提出了非线性有限元模型，并且凝聚区模型（CZM）用于评估模型中纱线与矩阵界面的禁止行为。考虑到界面损坏模式和编织复合材料中的纱线和矩阵的几种损伤模式，模拟损坏启动和失效过程，预测抗拉模量和材料的强度与实验结果相比。参数研究，界面性质对应力 - 应变曲线的影响。数值结果表明，界面模量对材料的拉伸模量产生了明显的影响，并且界面强度控制的界面损伤是导致拉伸应力曲线的非线性行为的关键因素之一。

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