A physically based model for kink-band growth and longitudinal crushing of composites under 3D stress states accounting for friction

Gutkin, Renaud; Costa, Sérgio; Olsson, Robin

doi:10.1016/j.compscitech.2016.09.002

Cited by 43 publications

(22 citation statements)

References 21 publications

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“…The test can be used for two purposes: (a) quantify the in-plane crush stress of UD plies and validate predictive models for this stress and (b) as a simple test for quantifying and ranking the crush behaviour of multidirectional laminates and for validation of predictive models for such laminates. An example of model validation for a 0 specimen without delamination may be found in Gutkin et al 17 Model validation for multidirectional laminates is ongoing and will be presented in later papers.…”

Section: Discussionmentioning

confidence: 99%

“…This supports the development of intralaminar models for longitudinal compression progressive failure with experimental input. 17,18 The proposed novel trigger, named triangular through-thickness (TTT) trigger, is compared to the traditional bevel trigger for longitudinal and for transverse crushing of UD carbon/epoxy NCF-reinforced composites. Information on the specimen crushing behaviour is obtained from video recordings and microscopic inspection and is discussed together with the test set-up.…”

Section: Introductionmentioning

confidence: 99%

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Development of a test method for evaluating the crushing behaviour of unidirectional laminates

Bru

Waldenström

Gutkin³

et al. 2017

Journal of Composite Materials

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More fundamental test methods are needed to assist the development of physically based and truly predictive simulation tools for composite materials under crash conditions. In this paper, a unidirectional flat specimen that can be used to validate the predicted behaviour from a simulation to the physical behaviour in the experiment is developed. A systematic experimental investigation is conducted to evaluate the influence of the trigger geometry on the crushing response by selecting two trigger types and different trigger angles. For longitudinal crushing, the traditional bevel trigger leads to out-of-plane failure by splaying with a limited amount of in-plane fracture, while the proposed trigger achieves a high amount of compressive fragmentation failure. For transverse crushing, the symmetry of the proposed new trigger improves the specimen stability during the crushing process. It is also observed that the weft threads of the unidirectional fabric reinforcement used for the tests have a strong influence on the longitudinal crushing response. The boundary conditions of the test and the information on the specimen failure gleaned from video recordings and microscopic inspections are discussed in order to facilitate a future correlation with modelling results.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a test method for evaluating the crushing behaviour of unidirectional laminates

Bru

Waldenström

Gutkin³

et al. 2017

Journal of Composite Materials

Self Cite

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“…Gutkin et al. 64,65 proposed a failure criterion for laminae subjected to longitudinal compression and shear combination. Numerically, Prabhakar and Waas 66 investigated the influence of the number of misaligned fibers on the lamina response.…”

Section: Logitudinal Compressive Strengthmentioning

confidence: 99%

Micromechanical analysis of longitudinal and shear strength of composite laminae

Vignoli

Savi

Pacheco

et al. 2020

Journal of Composite Materials

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The analysis of several micromechanical models for estimating strength of composite laminae is presented. Longitudinal tensile, compressive and in-plane onset shear strengths are analytically estimated and compared with experimental data available in the literature. The tensile longitudinal load predominantly induces rupture of fibers. On the other hand, the compressive strength is highly influenced by fiber misalignment, inducing a wide range of failure mechanisms. The material response to in-plane shear presents a strong nonlinear response. The estimation of longitudinal tensile strength based on the rule of mixture approaches is compared with 27 experimental data. A novel improvement is proposed assuming that in situ strength of fiber is smaller than fiber strength measured individually due to manufacturing induced damage. For the in-plane shear, 6 models are compared with 10 experimental stress-strain curves, including a novel closed-form expression based on the concentric cylinders model. Finally, for the longitudinal compressive strength, 8 micromechanical models, including a novel model to estimate misalignment effect in fiber crushing, are compared with 61 experimental data are analyzed. Results indicate that the minimal average error for the longitudinal tensile strength is 12.4% while for the compressive strength it is 15%. For the shear strength, the closest prediction depends on the strength definition and the proposed damage onset strength presents the best predictions. In general, the newly proposed models present the best estimations compared with the other models.

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“…Force P is the net effect of the normal stresses in the fiber σ f and force S is the net effect of the shear stresses in the fiber τ f such that, with the aid of Eqs. (10) and (11), criterion for fiber kinking can be subsequently proposed if energy balance considerations during crack formation come into play. This, however, is not the objective of this work.…”

Section: Equilibrium Equation In the Loaded Configurationmentioning

confidence: 99%

“…Moreover, they do not rely on or propose specially formulated finite elements that possess the capabilities to describe damage propagation in ways similar to those observed for instance in decohesive type elements. More recently, a number of published works included damage propagation modeling in longitudinal crushing of composites [9][10], but they do not explicitly consider microbuckling as the main damage mechanism. This work proposes to unite a microbuckling explicit model with matrix crack damage propagation resulting in a new alternative way to investigate failure under longitudinal compression.…”

Section: Introductionmentioning

confidence: 99%

Failure Induced by Instability in Structural Composites under Longitudinal Compression

Faria

Larsson

2019

Proceedings of the 10th Aerospace Technology Congress, October 8-9, 2019, Stockholm, Sweden

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The objective of this work is to develop a damage propagation model applicable to the study of failure mechanism in composites induced by longitudinal compression. The damage propagation model shall be based on an energy principle, quantified by the critical energy release rate associated to matrix cracking, and on the study of the kinematics of the equilibrium of a representative volume of a ply material within the damaged region of the laminate. It is expected that the model proposed will be implemented within the context of the finite element technology in order to expand its usefulness to realistic situations where multiple ply laminates are used. The model to be proposed shall capture the onset of formation of kink-bands and subsequently its propagation. It is formulated within the context of an energy based approach that considers the critical energy release rate of the matrix in the failed elements of the mesh. A damage parameter that ranges from 0 (intact) to 1 (fully damaged) is used that relates relative shear strains in the matrix induced by loss of stability of a representative volume. The damage models developed will be useful to realistically predict failure due to kink-band formation and propagation mechanism. The results obtained will serve as the starting point for larger collaborative projects involving strain rate effects and damage tolerant composites.

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A physically based model for kink-band growth and longitudinal crushing of composites under 3D stress states accounting for friction

Cited by 43 publications

References 21 publications

Development of a test method for evaluating the crushing behaviour of unidirectional laminates

Development of a test method for evaluating the crushing behaviour of unidirectional laminates

Micromechanical analysis of longitudinal and shear strength of composite laminae

Failure Induced by Instability in Structural Composites under Longitudinal Compression

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