摘要
单向小复合材料拉伸应力—应变行为与块状复合材料十分相似,研究小复合材料力学性能对准确表征块状复合材料在不同载荷条件下的力学行为具有重要意义。本文针对SiC纤维束及SiC/SiC小复合材料,通过试验方法对比了单调拉伸试验中接触式/非接触式应变测量方式的适用性,得出了分别适用于两种材料的最佳应变测量方案。使用聚类算法分析纤维束试样测试中的声发射信号,识别出了单丝、少量、巨量纤维断裂时对应的信号特征,可以为块状复合材料试样的声发射信号聚类分析提供依据。
The tensile stress-strain behavior of unidirectional small composites is very similar to that of bulk composites,and it is of great significance to study the mechanical properties of small composites to accurately characterize the mechanical behavior of bulk composites under different load conditions.In this paper,for SiC fiber bundles and SiC/SiC mini composites,the applicability of contact/non-contact strain measurement methods in monotonic tensile test was compared by experimental methods,and the optimal strain measurement scheme suitable for the two materials was obtained.The clustering algorithm was used to analyze the acoustic emission signal in the fiber bundle specimen test,and the corresponding signal characteristics of monofilament,small amount and macro fiber fracture were identified,which could provide a basis for the acoustic emission signal clustering analysis on composite specimens.
作者
蒙怡
杨胜春
毕宜春
屈孙涛
Meng Yi;Yang Shengchun;Bi Yichun;Qu Suntao(National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,China;Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an 710072,China)
出处
《航空科学技术》
2023年第10期17-23,共7页
Aeronautical Science & Technology
关键词
纤维束
小复合材料
应变测量
聚类
声发射
fiber bundles
mini composites
strain measurement
clustering
acoustic emission
