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Open AccessArticle

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

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Energy Research Institute at NTU/Interdisciplinary Graduate School, Nanyang Technological University, block S2-B3a-01, 50 Nanyang Avenue, Singapore 639798, Singapore
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School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 50 Nanyang Avenue, Singapore 639798, Singapore
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School of Materials Science & Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Energy Research Institute at NTU, Nanyang Technological University, Cleantech One, 1 Cleantech loop, #06-04, Singapore 637141, Singapore
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Author to whom correspondence should be addressed.
Materials 2017, 10(8), 909; https://doi.org/10.3390/ma10080909
Received: 5 July 2017 / Revised: 28 July 2017 / Accepted: 1 August 2017 / Published: 5 August 2017
(This article belongs to the Section Advanced Composites)
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. View Full-Text
Keywords: wind turbine blades; defects; laminates; in-plane fiber waviness; compressive strength; kink-band; failure; numerical and experimental analyses wind turbine blades; defects; laminates; in-plane fiber waviness; compressive strength; kink-band; failure; numerical and experimental analyses
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MDPI and ACS Style

Nair, S.N.; Dasari, A.; Yue, C.Y.; Narasimalu, S. Failure Behavior of Unidirectional Composites under Compression Loading: Effect of Fiber Waviness. Materials 2017, 10, 909.

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