期刊
COMPOSITE STRUCTURES
卷 244, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2020.112302
关键词
Carbon fibre; Polymer-matrix composites (PMCs); Open-hole tension (OHT); Damage mechanics; Non-destructive testing; Digital image correlation (DIC); Optical microscopy
资金
- Istanbul Development Agency (ISTKA) [ISTKA/BIL/2012/58]
- TUBITAK BIDEB 2214-A [1059B141600673]
- Toray Chair on Composites at KU Leuven
- KU Leuven Research Council [C24/17/052]
- Bogazici University Research Fund [10020/15A06D3]
This paper investigates damage progression during Open-Hole Tension (OHT) test of carbon fibre-reinforced composites with different Quasi-Isotropic (QI) layups. Digital Image Correlation (DIC) and in-situ edge microscopy are utilized simultaneously to detect damage on the specimen's surface and in the inner plies, respectively. It is found that damage does not always initiate in the 90 degrees plies, but also in the surface 45 degrees plies, depending on the orientation of the adjacent ply. DIC resulting strain field on the surface does not necessarily have the same butterfly-shape concentration around the hole, in all layups. Some laminates show large free edge delaminations at 45 degrees/90 degrees interfaces. This study adds in-situ evidences to the existing data on damage during OHT test of QI laminates, providing quantitative and comparative information on different damage modes, and reveals new features of the damage phenomena.
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