Quasi-static and dynamic shear properties of C/C composite pins

被引：0
作者：
Guo F. [1 ,2 ]
Li Y. [1 ,3 ]
Zhang P. [1 ,2 ]
Fei Q. [1 ,3 ]
机构：
[1] Institute of Aerospace Machinery and Dynamics, Southeast University, Nanjing
[2] Department of Engineering Mechanics, Southeast University, Nanjing
[3] School of Mechanical Engineering, Southeast University, Nanjing
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 05期
关键词：
C/C composites; Failure mechanism; Failure mode; Shear; Strain rate;
D O I：
10.13801/j.cnki.fhclxb.20200722.001
中图分类号：
学科分类号：
摘要：
A shear test machine was designed according to the needs of composite pins' shear tests. An electric universal testing machine was used to test the quasi-static in-plane shear properties of C/C composites, and a drop weight impact testing machine was used to test the dynamic in-plane shear properties of C/C composites. Then the shear failure mode and shear failure mechanism of C/C composite pins were analyzed using the SEM test apparatus. The results show that the shear failure strength of C/C composite pins is sensitive to strain rate, and it increases remarkably with the increasing strain rate. The shear failure mode of C/C composites is sensitive to the strain rate. Under quasi-static loading, the fiber/matrix interface is seriously debonded and the C/C composites show "pseudo-plastic" failure characteristics, while under dynamic loading, almost all the fibers are surrounded by matrix and the composites show "brittle" failure characteristics. The difference of C/C composites' shear failure modes under different loading rates is related to the strain rate sensitivity of the expansion of internal-cracks. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.
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页码：1604 / 1610
页数：6
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