Prediction of the crack density evolution in multidirectional laminates under fatigue loadings

Carraro, P.A.; Maragoni, L.; Quaresimin, Marino

doi:10.1016/j.compscitech.2017.03.013

Cited by 62 publications

(33 citation statements)

References 56 publications

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“…Therefore, the nature of the problem includes full 3D complexity, since the cracks that are initiated can no longer be assumed to span the entire region of uniform stress. To the knowledge of the authors, the only available off-axis crack evolution models for fatigue loading are found in [21][22][23][24][25]. The model in [21] predicts the crack density evolution in a cross-ply laminate using Monte-Carlo simulation of distributions of fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

“…The growth of individual cracks originating at the edges and the interaction of the cracks are modelled as the number of cycles is increased. A recent publication [25], presents an improved version of the model described in [23], where the requirement for the cracks to initiate at the edges is removed. However, as in [23] the model still relies on a Monte-Carlo simulation, which means that several damage variables for initiation and several damage variables describing the crack field must be included in each representative volume element (RVE).…”

Section: Introductionmentioning

confidence: 99%

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A stochastic multiaxial fatigue model for off-axis cracking in FRP laminates

Glud¹,

Dulieu-Barton²,

Thomsen³

et al. 2017

International Journal of Fatigue

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A model to predict off-axis crack evolution in multidirectional laminates subjected to multiaxial loading is proposed. The model applies multi-scale stress and local fracture mechanics analyses to distinguish between two microscopic damage mechanisms, which govern the damage evolution, as well as determining the magnitude of the damage evolution rate associated with each microscopic damage mechanism. The multi-scale analysis is based on the GLOB-LOC off-axis crack damage model, which is extended to include substantial new capabilities such as the influence of crack face sliding interaction and prediction of variations in the stress field due to the local crack density. The extension of the GLOB-LOC model introduces physically based multiaxial fatigue criteria for off-axis crack initiation and mixed-mode off-axis crack propagation. The extended GLOB-LOC model is implemented and it is demonstrated that good predictions are obtained for the damage evolution under various multiaxial stress conditions. Furthermore it is shown that the model only requires input from two different multiaxial stress states to obtain the material parameters for a given FRP ply.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A stochastic multiaxial fatigue model for off-axis cracking in FRP laminates

Glud¹,

Dulieu-Barton²,

Thomsen³

et al. 2017

International Journal of Fatigue

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“…13 This transverse matrix cracking and the intermediate distance has a significant effect on stiffness reduction. [30][31][32][33][34][35][36] Vassilopoulos and Philippidis reported a lower stiffness reduction for higher stressed specimens for various off-axis GFRP laminates. The final failure of the high-stressed specimen was fibre dominated whereas with comparatively lower stress, it was always matrix dominated.…”

Section: Introductionmentioning

confidence: 98%

“…The initiation, growth, and postponing of matrix cracks in the vicinity of interface predominantly depends on lay‐up sequence and loading condition . This transverse matrix cracking and the intermediate distance has a significant effect on stiffness reduction . Vassilopoulos and Philippidis reported a lower stiffness reduction for higher stressed specimens for various off‐axis GFRP laminates.…”

Section: Introductionmentioning

confidence: 99%

Effect of fatigue loading on stiffness degradation, energy dissipation, and matrix cracking damage of CFRP [±45]_3Scomposite laminate

Behera

Dupare

Thawre

et al. 2019

Fatigue Fract Eng Mat Struct

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In this study, a concept of using experimental matrix crack density, residual stiffness, and energy dissipation as a comparative life monitoring tool for any arbitrary stacking sequence is proposed. First, IMA/M21 [±45]3S carbon fibre‐reinforced polymer (CFRP) multidirectional (MD) laminates were fabricated by autoclaving technique. The static tension and compression tests were conducted to determine the fatigue stress levels. Then, constant amplitude tension–tension fatigue tests were carried out at two stress ratios (R = σmin/σmax) of 0.1 and 0.5. Three stress levels on the basis of cycles to failure (Nf) were chosen, ie, lower stress run‐out (LSR), lower stress fractured (LSF), and higher stress fractured (HSF). The LSF and LSR specimens primarily degraded due to matrix cracking that caused higher stiffness degradation and lower energy parameter, whereas HSF specimens having the least possibility of matrix crack growth showed lower stiffness degradation and higher energy parameter in a fibre‐dominated failure.

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“…The strength and fracture toughness can be evaluated experimentally or predicted using micromechanical models [26,27]. In [28], the two scales are bridged by assessing crack initiation using stress concentrations at the micro-scale, and calculating the cracking evolution under fatigue loading using an empirical Paris-like law for the crack growth.…”

mentioning

confidence: 99%

The effect of voids on matrix cracking in composite laminates as revealed by combined computations at the micro- and meso-scales

Mehdikhani

Petrov

Straumit

et al. 2019

Composites Part A: Applied Science and Manufacturing

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Voids are an important type of manufacturing defects in fiber-reinforced composites. Matrix cracking is sensitive to the presence of voids. Although this cracking occurs at the ply scale, its dynamics is strongly affected by ply's microstructure, in particular, fiber distribution, fiber content, and the presence of voids. In the current study, a computational approach to simulate the influence of intra-laminar voids on cracking in composite laminates is developed. The approach combines finite element models of two scales: a micro-scale model, where the fibers and voids are modeled explicitly, and a meso-scale model, where the cracking phenomenon is captured on the ply scale. The micro-scale model, incorporating plasticity and damage in the matrix, provides input for the meso-scale model, which simulates the progressive cracking by means of the extended finite element method. The methodology is applied to investigate the effect of voids on the density of transverse cracks in cross-ply laminates in function of the quasi-static tensile load. Different sizes and contents of voids, which are chosen based on experimental micro-computed tomography data, are simulated. The numerical experiments show that the presence of voids leads to earlier start of the cracking, with the crack density evolution less sensitive to voids.

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Prediction of the crack density evolution in multidirectional laminates under fatigue loadings

Cited by 62 publications

References 56 publications

A stochastic multiaxial fatigue model for off-axis cracking in FRP laminates

A stochastic multiaxial fatigue model for off-axis cracking in FRP laminates

Effect of fatigue loading on stiffness degradation, energy dissipation, and matrix cracking damage of CFRP [±45]_3Scomposite laminate

The effect of voids on matrix cracking in composite laminates as revealed by combined computations at the micro- and meso-scales

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Prediction of the crack density evolution in multidirectional laminates under fatigue loadings

Cited by 62 publications

References 56 publications

A stochastic multiaxial fatigue model for off-axis cracking in FRP laminates

A stochastic multiaxial fatigue model for off-axis cracking in FRP laminates

Effect of fatigue loading on stiffness degradation, energy dissipation, and matrix cracking damage of CFRP [±45]3Scomposite laminate

The effect of voids on matrix cracking in composite laminates as revealed by combined computations at the micro- and meso-scales

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Effect of fatigue loading on stiffness degradation, energy dissipation, and matrix cracking damage of CFRP [±45]_3Scomposite laminate