In-plane shear investigation of 3D surface-core braided composites

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• 作者：Jin Sun ; Guangming Zhou ; ^{zhougm@nuaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Chuwei Zhou ; Xinfeng Wang
• 关键词：Fibers ; Mechanical properties ; Stress/strain curves ; Finite element analysis (FEA)
• 刊名：Composites Science and Technology
• 出版年：2016
• 出版时间：27 October 2016
• 年：2016
• 卷：135
• 期：Complete
• 页码：54-66
• 全文大小：6233 K

文摘

In-plane shear properties of three-dimensional (3D) surface-core braided composite are investigated by numerical simulation and experimental tests. Based on RVE models, the mechanical responses under in-plane shear load and the basic shear properties related to braiding parameters are predicted by using finite element method. Numerical results indicate that two groups of surface-cores possess distinct sensitivities to shear loads and identify the main load bearing components. In-plane shear tests are conducted to compare the effects of surface cuttings on the mechanical properties of present material and 3D 4-directional braided composite. The experimental data reveal that the cuttings degrade the shear moduli and strengths of the two materials to varying degrees. 3D surface-core braided composite can effectively restrain the decline of shear properties caused by cuttings. Scanning electron microscopy (SEM) is used to identify the distinct damage mechanisms of tested materials.