单向复合材料在压缩载荷下的失效行为：纤维波纹度的影响。

Failure Behavior of Unidirectional Composites under Compression Loading: Effect of Fiber Waviness.

作者信息

Nair Swaroop Narayanan, Dasari Aravind, Yue Chee Yoon, Narasimalu Srikanth

机构信息

Energy Research Institute at NTU/Interdisciplinary Graduate School, Nanyang Technological University, block S2-B3a-01, 50 Nanyang Avenue, Singapore 639798, Singapore.

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 50 Nanyang Avenue, Singapore 639798, Singapore.

出版信息

Materials (Basel). 2017 Aug 5;10(8):909. doi: 10.3390/ma10080909.

DOI:10.3390/ma10080909

PMID:28783057

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5578275/

Abstract

The key objective of this work is to highlight the effect of manufacturing-induced fiber waviness defects on the compressive failure of glass fiber-reinforced unidirectional specimens. For this purpose, in-plane, through-thickness waviness defects (with different waviness severities) are induced during the manufacturing of the laminate. Numerical and experimental results show that the compressive strength of the composites decreases as the severity of the waviness defects increases. A reduction of up to 75% is noted with a wave severity of 0.075. Optical and scanning electron microscopy observations of the failed specimens reveal that kink-bands are created in the wavy regions and lead to failure.

摘要

这项工作的关键目标是突出制造过程中产生的纤维波纹缺陷对玻璃纤维增强单向试样压缩失效的影响。为此，在层压板制造过程中引入了面内、贯穿厚度的波纹缺陷（具有不同的波纹严重程度）。数值和实验结果表明，复合材料的抗压强度随着波纹缺陷严重程度的增加而降低。当波纹严重程度为0.075时，抗压强度降低高达75%。对失效试样的光学和扫描电子显微镜观察表明，在波纹区域会形成扭结带并导致失效。