Experimental investigation on longitudinal compression properties of 3D multidirectional braided composite

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作者：
Composite Materials Research Institute, Tianjin Polytechnic University, Tianjin 300160, China [1 ]
不详 [2 ]
不详 [3 ]
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来源：
Guti Houjian Jishu | 2006年 / 1卷 / 63-66期
关键词：
Compression testing - Failure (mechanical) - Fracture testing - Strain - Stress analysis;
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摘要：
Compression tests for the 3D 5-directional and the 3D 6-directional braided composites were conducted by using shot-gauge plate sample method. The method can avoid buckling of sample and cracking of end fiber bundle, which is suitable for compression tests of 3D multidirectional braided composites. On the basis of tests, the change law of longitudinal compression stiffness, compression strength, Poissons ratio with braiding process parameters and failure mode of composite were analyzed. The 3D 5-directional and the 3D 6-directional braided composites keep linear elastic; longitudinal compression failure is of brittleness. The increase of braiding angle makes longitudinal compression properties decrease; the decrease of fineness of 4-directional braided yarns tends to improve the longitudinal compression properties of materials. Moreover, the longitudinal compression properties of 3D 6-directional braided composites are lower than that of 3D 5-directional braided composites.
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