Predicting fiber composite damage and failure

Rohwer, K.

doi:10.1177/0021998314553885

Cited by 20 publications

(14 citation statements)

References 110 publications

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“…This paper reviews different possibilities of formulating criteria and points out development tendencies limited to laminated continuous fiber-reinforced polymer composites. As an updated version of a paper previously published by the author [1] this review was prepared for and presented at the NAFEMS World Congress in San Diego, CA, in June 2015. It then was adequately formatted and modified for publication in FU Mech Eng.…”

Section: Introductionmentioning

confidence: 99%

Models for Intralaminar Damage and Failure of Fiber Composites - A Review

Rohwer

2016

FU Mech Eng

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In order to fully exploit the potential of structures made from fiber composites, designers need to know how damage occurs and develops and under what conditions the structure finally fails. Anisotropy and inhomogeneity cause a rather complex process of damage development which may be one reason for an exceptionally large number of existing models. This paper intends to provide an overview over those models and give some hints about current developments. As such it is an updated version of a recent publication [1]. The survey is limited to laminates from unidirectional layers out of straight continuous fiber polymer composites under quasi-static loading. Furthermore, focus is laid on intralaminar damage.Many failure models smear out the inhomogeneity between fibers and the matrix. Simply limiting each stress component separately can lead to surprisingly good results as documented in the first World-Wide Failure Exercise. Interpolation criteria consider mutual influence of normal and shear stresses, predominantly through a quadratic failure condition. Traditionally one distinguishes between interpolation criteria and physically based ones. As an important physical effect the difference between fiber failure and inter-fiber failure is considered. Furthermore, stress invariants are taken as a basis, increased shear strength under compression is accounted for, and characteristic failure modes are captured. Fibers and the matrix material are characterized by a large disparity in stiffness and strength. Micromechanical models consider this inhomogeneity but suffer from the difficulty to determine relevant material properties. Compressive strength in fiber direction has attracted special attention. However, the role of kink band formation, which is observed in the failure process, seems to be not yet fully understood.In summary it must be concluded that despite the tremendous effort which has been put into the model development the damage and failure simulation of fiber composites are not in a fully satisfying state. That is partly due to lack of accurate and reliable test results.

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Section: Introductionmentioning

confidence: 99%

Models for Intralaminar Damage and Failure of Fiber Composites - A Review

Rohwer

2016

FU Mech Eng

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“…Despite recent advances with stochastic multiscale models and UQ methodologies, five decades after the pioneering work of Kachanov [51,52] on continuum damage mechanics, one question still remains open: are there pertinent models and tools for the sound investigation of composite responses to micro-defects? As Rohwer [70] has recently remarked, "A fully satisfying model for describing damage and failure of fiber composites is not yet available. Consequently, for the time being, a real test remains the authentic way to secure structural strength.…”

Section: Multiscale Methods In Engineeringmentioning

confidence: 99%

A fuzzy-stochastic multiscale model for fiber composites

Babuška

Motamed

2016

Computer Methods in Applied Mechanics and Engineering

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We study mathematical and computational models for computing the deformation of fiber-reinforced cross-plied laminates due to external forces. This requires an understanding of both micro-structural effects and different sources of uncertainty in the problem. We first show that the uncertainties in the problem are of both statistical (aleatoric) and systematic (epistemic) types and that current multiscale stochastic models, such as stationary random fields, which are based on precise probability theory, are not capable of correctly characterizing uncertainty in fiber composites. Next, we motivate the applicability of models based on imprecise uncertainty theory and present a novel fuzzy-stochastic model, which can more accurately describe uncertainties in fiber composites. The new model is constructed by combining stochastic fields and fuzzy variables through a simple calibration-validation approach. Finally, we construct a global-local multiscale algorithm for efficiently computing output quantities of interest. The method aims at approximating required quantities, such as displacements and stresses, in regions of relatively small size, e.g. hot spots or zones. The algorithm uses the concept of representative volume elements and computes a global solution to construct a local approximation that captures the microscale features of the solution. The results are based on and backed by real experimental data.

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“…Further model modifications proposed by the authors are to describe the in-plane shear behaviour by the nonlinear elastic Krause 13 model, if the material indicates a high degree of nonlinearity in this material direction, that could not anymore be captured properly by the Hahn and Tsai 12 model used by Shokrieh and Lessard. 2,3 the incorporation of the three dimensional Puck’s failure criterion for indication of sudden failure as its two dimensional form gains more accurate results in the first World-Wide Failure Exercise (WWFE-I) 15,17 than by the Shokrieh and Lessard used Hashin’s criterion. the incorporation of the degradation of the Poisson’s ratios to consider that strains in the degraded material direction cannot produce lateral contraction. 27 to use the more general orthotropic form of the elasticity matrix to consider the loss of transverse isotropy with emerging damage. …”

Section: Summary and Look Forwardmentioning

confidence: 99%

“…the incorporation of the three dimensional Puck’s failure criterion for indication of sudden failure as its two dimensional form gains more accurate results in the first World-Wide Failure Exercise (WWFE-I) 15,17 than by the Shokrieh and Lessard used Hashin’s criterion.…”

Section: Summary and Look Forwardmentioning

confidence: 99%

Fatigue damage model for fibre-reinforced polymers at different temperatures considering stress ratio effects

Lüders

Krause

Kreikemeier

2018

Journal of Composite Materials

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Most of the existing fatigue models for fibre-reinforced polymers are limited to a specific use case. The investigation presented in this paper provides a progressive fatigue damage model that can be used for fatigue analysis of composite structures under general loading conditions and at arbitrary ambient temperatures. The model is based on an existing approach that already considers mean stress and degradation effects. This model is extended for predicting fatigue damage at general loading conditions. To incorporate the effect of ambient temperatures, material and model parameters are defined temperature dependent. The new model is validated using two composite materials and different loading conditions as well as under both room and high temperatures. The model achieves a good prediction quality for the analysed materials, loading conditions and temperatures. This demonstrates that the proposed model is not limited to a specific use case but is able to simulate fatigue of laminated composites under general loading conditions.

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Predicting fiber composite damage and failure

Cited by 20 publications

References 110 publications

Models for Intralaminar Damage and Failure of Fiber Composites - A Review

Models for Intralaminar Damage and Failure of Fiber Composites - A Review

A fuzzy-stochastic multiscale model for fiber composites

Fatigue damage model for fibre-reinforced polymers at different temperatures considering stress ratio effects

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