On the introduction of a mean stress in kinetic damage evolution laws for fatigue

An efficient computational strategy of cycle-jumps dedicated to fatigue of composite structures

“…This formulation complies with the need of reducing computational cost at each increment, as it enables to compute analytically the residual strains, as proposed in [8]. This type of model has already been validated through comparisons with experimental results on PCMs [7,30]. In the present article, the model is applied to a 2D woven oxide/oxide composite with a 50/50 warp/weft ratio.…”

“…, presented in the next paragraph. It is calculated using a kinetic mean (frequency independent where time, t, is the current time), based on the past history of loading and described in [7,8],…”

“…This kinetic formulation enables naturally the model to simulate any kind of loading: monotonic, cyclic or spectral [7,8]. It decomposes time into intervals of either static or fatigue loading, a property that will be useful to implement eciently cycle jumps.…”

“…On the one hand, cyclic models propose evolution laws for damage increment per cycle dd dN = ..., which have been recently applied to composite materials [1,2,3,4,5]. On the other hand, kinetic (rate) models consider a time evolution of damageḋ = ... [6,7,8]. In the present work, we focus on a kinetic model, the continuous evolution of damage enabling to naturally consider spectral loadings, representative of real industrial applications.…”

Report of Committee III.2: Fatigue and fracture

“…The modified Chaboche continuum damage model has been proposed introducing non-linear mean stress dependence for fatigue assessment of polymer composites based on orthotropic damage evolution. Haigh diagrams and fatigue resistance curves have been constructed to illustrate the model capabilities (Desmorat et al, 2015).…”