Evaluation of interfacial properties in SiC composites using an improved cohesive element method

ZANG Hang; CAO Xingqing; HE Chaohui; HUANG Zhisheng; LI Yonghong

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Evaluation of interfacial properties in SiC composites using an improved cohesive element method

ZANG Hang * #,CAO Xingqing,HE Chaohui,HUANG Zhisheng,LI Yonghong

Department of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an 710049

*Correspondence author

#Submitted by

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Funding: the Specialized Research Fund for the Doctoral Program of Higher Education of China （No.No.20130201120065）, Natural Science Basic Research Plan in Shaanxi Province of China（No.No. 2015JQ1030）, the National Natural Science Foundation of China（No.No. 11405124）

Opened online:24 April 2017

Accepted by: none

Citation: ZANG Hang,CAO Xingqing,HE Chaohui.Evaluation of interfacial properties in SiC composites using an improved cohesive element method[OL]. [24 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725456

A two-dimensional axisymmetric finite element model based on an improved cohesive element method was developed to simulate the the interfacial debonding, the sliding friction and residual thermal stresses of SiC composites during single fiber push-out test to extract the interfacial bond strength and frictional stress. The numerical load-displacement curves agree well with the experimental curves, indicating that this cohesive element can be used for calculating the interfacial properties of SiC composites. The simulation results show that the crack is most likely to occur at both ends of the experiment, where the maximum shear stress is observed, and the interfacial shear strength and the constant sliding friction stress decrease with an increase of temperature. Moreover, the load required to cause a complete failure of the interface is with the increase of shear strength and composite material with higher fiber volume fraction has stronger bearing capacity. In addition, the initial failure load becomes stronger with an increase of interphase thickness.

Keywords:SiC composites; Fiber push-out test; Cohesive element model; Finite element method; Interfacial properties

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