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Experimental Investigation of the In-Plane Shear Behavior on Needled C/SiC Composites using Digital Image Correlation
G. Yu1, X. Gao1, Y. Song1,2
1 Jiangsu Province Key Laboratory of Aerospace Power System, Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Ast
2 State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R. China
received August 8, 2016, received in revised form September 21, 2016, accepted October 5, 2016
Vol. 7, No. 4, Pages 387-396 DOI: 10.4416/JCST2016-00052
Abstract
In this study, the digital image correlation (DIC) technique was employed as a full-field measuring tool to analyze the in-plane shear deformation behavior of needled C/SiC composites. The non-linear in-plane shear stress-strain curve was obtained. The shear strain distribution and evolution were analyzed. The correlation between the shear strain distribution along the notches and the structure of needled preforms was investigated. The initiation and propagation of the cracks on the surface of shear specimens were studied. The failure mechanisms of needled C/SiC composites under shear loading were also investigated using a scanning electron microscope and an optical camera.
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Keywords
Shear behavior, C/SiC composites, digital image correlation, strain field, failure mechanism
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