多向细编碳／碳复合材料界面力学性能测试与表征

CHARACTERISTICS OF INTERFACES IN 3D FINE WEAVE CARBON/CARBON COMPOSITES

本文用自制装置研究了多向细编Ｃ／Ｃ复合材料纤维束性能，分析了工艺过程的影响。同时用界面微脱粘实验技术研究了Ｃ／Ｃ复合材料界面性能，给出了相应的理论模型和界面应力分布，提出了由界面脱粘力，纤维、基体和复合材料性能表征界面剪切强度的方法，为Ｃ／Ｃ复合材料优化设计提供了定量参数。结果表明：织物结构、织物编织工艺以及织物／基体复合对纤维的强度影响很大，降为原始纤维的２０％左右，对模量影响小。不同界面层次，纤维／基体的界面结合情况和界面剪切强度不同，Ｚ向纤维束中纤维／基体结合好，具有最高的结合强度，ＳＥＭ观察证实有大量基体碳在纤维上枝联。

The statkhcal analysis in-situ failure was exammed for 3D C/Ccornposites by different processing technology. An in-situ interfacial strength testinginstrument was used to determine the fiber/matrix bond properties of C/C composites. Thispaper also introduces a micromechanics model for the study of the stress and strain fieldsalong the fiber /matrix interface and provides a description method of the interface propertiesby the debonding force and mechanical properties of fiber, matrix and composites. Theanalysis shows that the resuIts can provide an optimal design of C/C composites. Associatedwith high temperature processing are the phenomena of fiber bundle strength loss up toabout 20%, Comparing the different interfaces reveals that fiber bundles in the z directionhave the best bonding and the strongest interphase.