Out-of-plane compression properties and failure mechanism of gradient 3D woven composites

被引:8
|
作者
Liu, Yang [1 ,2 ,4 ]
Shan, Zhongde [2 ,3 ]
Liu, Feng [2 ]
Sun, Zheng [3 ]
机构
[1] Tsinghua Univ, Dept Mech Engn, Beijing, Peoples R China
[2] China Acad Machinery Sci & Technol, State Key Lab Adv Forming Technol & Equipment, Beijing, Peoples R China
[3] Nanjing Univ Aeronaut & Astronaut, Coll Mech & Elect Engn, Nanjing, Peoples R China
[4] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
关键词
compression property; failure mechanism; gradient composites;
D O I
10.1002/pc.27523
中图分类号
TB33 [复合材料];
学科分类号
摘要
Gradient three-dimensional (3D) orthogonal preforms with low- and high-density regions were manufactured through the flexible oriented 3D woven process (FO3DWP) at different fiber volume fractions and z-yarn contents. The layer porosity distribution of preforms was regulated by modifying fiber tension and measured using micro-computed tomography (micro-CT) technology. After impregnation with epoxy resin, the out-of-plane compression properties of gradient 3D woven composites were evaluated. The results indicated that the out-of-plane compression strength could be improved by the gradient design. In particular, the gradient composite with a fiber volume fraction of 0.46 and z-yarn volume fraction of 0.05 exhibited the highest compression strength at 470 MPa. Furthermore, failure morphologies were analyzed using micro-fracture photographs and scanning electron microscopy (SEM). The gradient design efficiently protected the interface between z-directional fibers and the matrix by minimizing z-yarn bending. However, the compression strength of 3D woven composites decreased as the z-yarn content increased from 0.05 to 0.15, due to the increased bending of the z-directional fibers during the compression test.
引用
收藏
页码:5746 / 5754
页数:9
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