High Cycle Fatigue Damage Model for Delamination Crack Growth in CF/Epoxy Composite Laminates

Abstract

This article presents the development of a fatigue damage model which helps to carry out simulation of the evolution of delamination in the laminated composite structures under cyclic loadings. A classical interface damage evolution law, which is commonly used to predict the static debonding process, is modified further to incorporate fatigue delamination effects due to high cycle loadings. An improved formulation is also presented to incorporate the ‘R’ ratio effects. The proposed fatigue damage model is identified using fracture mechanics tests like double cantilever beam, end-notched-flexure and mixed-mode bending. Then a non-monotonic behavior is used to predict the fatigue damage parameters able to carry out delamination simulations for different mode mixtures. Linear Paris plot behaviors of the above-mentioned fracture mechanics tests are successfully compared with available experimental data on HTA/6376C and AS4/PEEK unidirectional materials.

Intralaminar fatigue crack growth properties of conventional and interlayer toughened CFRP laminate under mode I loading

“…In addition, the fatigue crack growth behaviour of CFRP laminates still remains to be elucidated, thus many active discussions have been continuously held [34][35][36]. Here, one of the common problems in these studies is the increase in crack growth resistance owing to the fibre bridging effect for fatigue crack growth [37]. Since the crack growth behaviour depends on the crack length, it is difficult to obtain a minimum threshold value for fatigue crack growth using conventional load-shedding tests [29,38,39].…”

Unified model for Mullins effect and high cycle fatigue life prediction of rubber materials

“…The proposed high cycle fatigue part of the damage model is based on an improved method already proposed in (Gornet & Ijaz 2011) for composite materials. Hence, in case of fatigue loadings, we assume that the damage variables of the rubber part will be also governed by the maximum value of the first invariant during the cyclic loadings.…”

Parameter estimation of a rate-dependent damage constitutive model for damage-tolerant brittle composites by Self-OPTIM analyses

“…The fabric tensor was also applied to crack density distributions (Lubarda and Krajcinovic, 1993;Voyiadjis and Kattan, 2006). In literatures, various damage models have been researched to simulate different damage modes such as fiber/particle fractures (Koimtzoglou et al, 2001;Liu et al, 2005), fibermatrix/particle-matrix debonding Ju and Lee, 2001;Ju and Yanase, 2008;Kim and Lee, 2011;Liu et al, 2004;Skolnik et al, 2008), delamination (Gornet and Ijaz, 2011;Subramanian et al, 1995;Tian and Fu, 2011), and hybrid damage modes (Barbero et al, 2005;Ghosh et al, 2001;Gudmundson, 2000;Haj-Ali, 2009;Lamon, 2001;Mishnaevsky and Brondsted, 2009;Murari and Upadhyay, 2012;Okabe et al, 2010;Pyo and Lee, 2009;Tay et al, 2008;Tekoglu and Pardoen, 2010;Wang et al, 2009). In this article, a rate-dependent micromechanics-based damage model for brittle composites is adopted; the model is derived from an original micromechanical material model called Statistical CRAck Mechanics (SCRAM) that accounts for the opening, shear, growth, and coalescence of an ensemble of microcracks (Dienes, 1983).…”