A generalized micromechanical approach for the analysis of transverse crack and induced delamination in composite laminates

Farrokhabadi, Amin; Hosseini‐Toudeshky, Hossein; Mohammadi, Bijan

doi:10.1016/j.compstruct.2010.08.036

Cited by 32 publications

(33 citation statements)

References 27 publications

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“…Meso modeling, which is defined at ply level, is presented in 14,15 . A multi-scale model for matrix crack evolution in composite laminates is shown in [16][17][18] , where the material is described by means of two levels of layer and interface. In [16][17][18] the degraded material properties are represented as CDM to the macro FEA model, which finds the structural response of laminates under in-plane loading condition 19 .…”

Section: Introductionmentioning

confidence: 99%

Micro/macro approach for prediction of matrix cracking evolution in laminated composites

Ghayour

Hosseini‐Toudeshky

Jalalvand

et al. 2015

Journal of Composite Materials

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Abstract A computational constitutive model is presented to predict matrix cracking evolution in laminates under in-plane loading. Transverse cracks are treated as separate discontinuities in the micro model which provides damage parameters for the macro model. Both micro and macro models are implemented using Finite Element Analysis (FEA); specifically ANSYS, avoiding limitation of analytical micro modeling. The computational cost of the micro model is limited to constructing a database (DB) of micro-model predictions a priori. The macromodel is simply a FEA discretization of the structure using plane stress or shell elements in ANSYS. The macro model queries the DB, which effectively becomes a constitutive model. The damage surfaces in the DB are obtained from the results of large number of finite element micro-scale (unit-cell) analyses. The proposed procedure is implemented in ANSYS as a usermaterial subroutine for transverse crack initiation and propagation in symmetric cross-ply and [0r/(s/0n]s laminates under in-plane loads. This method is also examined to study matrix crack evolution in tensile specimen with open hole and the results found to be in good agreement with available experimental data.

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Section: Introductionmentioning

confidence: 99%

Micro/macro approach for prediction of matrix cracking evolution in laminated composites

Ghayour

Hosseini‐Toudeshky

Jalalvand

et al. 2015

Journal of Composite Materials

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“…Recently progression of various FE softwares in the context of damage simulation has provided a unique opportunity for researchers to examine more accurately any damage effects on the performance of the composite laminates. Many researchers using FE tools performed progressive damage studies based on the micro/meso models for composite laminates with various lay-up methods [22][23][24][25]. Review of these researches shows that the majority of the progressive failure studies on the composite laminates were done under in-plane loading conditions and the examined cases under out-of-plane loads [26][27][28][29] are rarely compared.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stiffness degradation progress in Glass/Vinylester laminated beams under large deformations

2017

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There are many reports indicating that the maximum measured stress in the composite laminated beams under flexural loading appears different from that under tensile loading. The current study compares the results of Hashin failure criteria in the form of stress and strain components for prediction of failure strength in GFRP laminated beams. In the experimental program the composite laminates were tested under tensile and three-point-bending (3PB) loads. Then, it was trying to predict the flexural failure in laminates based on the measured ultimate stresses and strains in the tensile tests. The strain-based failure criteria employed in the FE models could achieve more admissible predictions for maximum load carrying capacity in the laminates compared to the stress-based criteria. Progressive failure analyses showed that due to higher elastic modulus of laminates under bending load, the maximum experienced stress under bending load becomes larger.

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“…This type of delamination initiates from the tips of matrix microcracks and propagates through the width of specimen and between the two free edges of laminate. This damage phenomena has been widely addressed by micro-mechanical approaches in the literature; mostly by analytical methods [1][2] and especially by shear-lag method [3][4][5][6] . Variational technique [7][8][9] and finite element methods [10][11] have been generally used for deriving the stress distribution at the 90˚/0˚ interface.…”

Section: ) Introductionmentioning

confidence: 99%

Numerical modeling of diffuse transverse cracks and induced delamination using cohesive elements

Jalalvand

Hosseini‐Toudeshky

Mohammadi

2012

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper is devoted to the modeling of spread kind of damages such as matrix cracking and induced delamination in symmetric and asymmetric cross-ply laminates of composite materials using cohesive elements. For matrix crack modeling, parallel rows of cohesive elements are used between every row of 2D elements in 90˚ layers. Delamination is also modeled by cohesive elements at the 90˚/0˚ interface. Since matrix cracking is a diffuse kind of damage mechanism, application of cohesive elements is not straightforward, and special techniques are necessary to resolve the modeling difficulties. For this purpose, two techniques of "bisecting" and "random distribution of strength of cohesive elements" are proposed here. Both techniques are applied to various symmetric laminates of [0/90 3 ] s and [90 n /0] s (n=1 to 3). The predicted stiffness and damage progresses from both techniques are in good agreement with the experimental results. Then, asymmetric cross-ply laminates of [90 n /0] (n=1 to 3) are analyzed to show the capability of this method in progressive damage analyses. The proposed method is less restricted in comparison with available micromechanical methods and is able to predict damage initiation, propagation and damagemode transition for any symmetric and asymmetric cross-ply sequence. Therefore, this method can be used for development of "in-plane damage" constitutive laws especially when specimens are subjected to complex loading and boundary conditions.

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A generalized micromechanical approach for the analysis of transverse crack and induced delamination in composite laminates

Cited by 32 publications

References 27 publications

Micro/macro approach for prediction of matrix cracking evolution in laminated composites

Micro/macro approach for prediction of matrix cracking evolution in laminated composites

Investigation of stiffness degradation progress in Glass/Vinylester laminated beams under large deformations

Numerical modeling of diffuse transverse cracks and induced delamination using cohesive elements

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