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J. Compos. Sci. 2018, 2(1), 9;

Predicting Fatigue Damage of Composites Using Strength Degradation and Cumulative Damage Model

Department of Aerospace Engineering, San Diego State University, San Diego, CA 92182, USA
N & R Engineering, 6659 Pearl Rd # 201, Cleveland, OH 44130, USA
Author to whom correspondence should be addressed.
Received: 30 December 2017 / Revised: 8 February 2018 / Accepted: 8 February 2018 / Published: 14 February 2018
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This paper discusses the prediction of fatigue response of composites using an empirical strength and stiffness degradation scheme coupled to a cumulative damage accumulation approach. The cumulative damage accumulation approach is needed to account for the non-constant stress levels that arise due to stress distributions from stiffness degradation during the fatigue loading. Degradation of strength and stiffness during fatigue loading of the composite was implemented by following the empirical model presented by Shokrieh and Lessard with some modification and correction to the non-dimensional load parameter definition. The fatigue analysis was performed using ABAQUS™ finite element software using a user-defined material subroutine UMAT developed for the material response. Implementation results were first verified for unidirectional laminate test cases and validated by predicting stress versus life (S-N) curves for several laminate coupons test simulations and residual strengths of Open Hole Tension (OHT) specimens subjected to constant amplitude fatigue loading. View Full-Text
Keywords: CFRP composite; fatigue; strength; stiffness; UMAT CFRP composite; fatigue; strength; stiffness; UMAT

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Khan, A.I.; Venkataraman, S.; Miller, I. Predicting Fatigue Damage of Composites Using Strength Degradation and Cumulative Damage Model. J. Compos. Sci. 2018, 2, 9.

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J. Compos. Sci. EISSN 2504-477X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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