HCF damage model for fatigue in composites

L. BARBU; X. MARTINEZ; S. OLLER; A. BARBAT

Congreso; European Congress on Computational Methods in Applied Sciences and Engineering. Fatigue in Composites; 2016

This work proposes a damage constitutive model at composite constituent levelthat accounts for fatigue effects by affecting both the strength and the stiffness ofthe composite component. The behavior of the composite material will be obtainedby means of the rules of mixtures (ROM) theory [1].The constitutive model is based on the damage model proposed by Oliver et al. [2]and used in Oller et al. [3]. Its capabilities of dealing with ?High Cycle Fatigue? insteel have been studied by Barbu et al. [4] and offered good results in terms of lifeprediction.The present work explores the use of the coupled plastic damage model and ROMtheory for composite materials where the failure occurs in the ?High-Cycle Fatigue?regime and is due to either component failure or to delamination between matrixand fiber. At component level, the model is valid for materials with a softeningbehavior. Numerical examples will be shown in order to better illustrate the modelbehavior and a comparison with the experimental results shown by Keller et al. [5]will be made in terms of life prediction and failure mode.