一种测定单向纤维增强陶瓷基复合材料组分“原位”弹性模量的方法

A method for measuring the in situ constituent modulus in unidirectional fiber-ceramic composites

提出了一种将细观分析和宏观实验相结合的方法以测量纤维陶瓷基复合材料组分“原位”弹性模量,即利用混合率和Evans等导出的加载后卸载-再加载应力-应变曲线迟滞回环和组分材料力学性能之间的关系,反解出纤维的原位模量。将此方法成功地应用于C/SiC复合材料,初步结果表明此方法是行之有效的,还表明C/SiC复合材料中纤维的原位弹性模量有明显下降。

A method which is a combination of meso-theoretical analysis and macro-experimental measurement was first given to calculate the in situ fiber modulus by using the mixture law and the relationships between the stressstrain hysteresis characteristics and the constituent modulus. The method was successfully applied to C/SiC composites. The result from preliminary experiments shows that the method is effective. It also shows that the in situ fiber modulus degrades noteworthily in Cf/SiC composites.