Tensile Property Test of 3D Braided Composites with Defects
LIANG Shuangqiang1, CHEN Ge1, 2, ZHOU Qihong1, Frank Ko3
1 College of Mechanical Engineering,Donghua University, Shanghai 201620, China 2 College of Textile and Clothing, Xinjiang University, Urumchi 830046, China 3 Department of Material Engineering, University of British Columbia, Vancouver V6T1Z4, Canada
Abstract: In order to study the defect effect on three dimensional (3D) braided composite, two types of 3D braided specimens involved the defect were fabricated and tested. One was the pure braided pattern, the other one incorporated 42% of longitudinal lay-in yarns. A quasi-static tensile strength test was carried out for test parts with and without defects in accordance with ASTM D3039 and D5799, respectively, which was compared with laminates. The results showed that with or without defect, the pure braided 3D composites have higher strength than lay-in structure, the lay-in longitudinal yarns improve neither specimens nondefective strength, nor the defective strength. The both two types of 3D braided composites can retain higher proportion of tensile strength in comparison with laminates after involved the defect. Regarding the failure behavior, crack of both defective specimens will propagate along the defect and finally render the specimen fail, clear cracks usually show up on the samples without axial yarns, while not for the specimens with axial yarns.
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2020, Vol. 34 
