Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 100, Issue -, Pages 118-127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2017.05.010
Keywords
Polymer matrix composites; Fatigue; Damage mechanics; Microstructural analysis
Funding
- National Centre for Aerospace Innovation and Research, IIT-Bombay
- Department of Science and Technology Government of India
- Boeing Company
- IIT Bombay
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Property degradation for carbon fiber reinforced polymer (CFRP) composites under fatigue is usually modeled by assuming some kind of notional internal damage parameter which keeps growing with fatigue cycles. However, the damage parameter is itself defined as a function of property degradation. Hence, these models do not have a true predictive capability for mechanical property degradation. In this study, controlled microstructural damage was created by subjecting the unidirectional CFRP specimen to tension-tension fatigue load with predetermined stress ratio, load factor and number of cycles. True 3D microstructural damage state, in terms of fiber breakage, matrix microcracking and interface debonding, in CFRP composites was quantitatively measured. The work further mapped the damage state, from 3D damage space, to the stiffness degradation irrespective of how the damage state was achieved. This is for the first time that property degradation in CFRP under cyclic loading was related to the independently measured damage state. (C) 2017 Elsevier Ltd. All rights reserved.
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