Finite fracture mechanics analysis of crack onset at a stress concentration in a UD glass/epoxy composite in off-axis tension

Andersons, J.; Tarasovs, S.; Spārniņš, E.

doi:10.1016/j.compscitech.2010.04.017

Cited by 38 publications

(11 citation statements)

References 52 publications

(64 reference statements)

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“…We consider a coupled strength and toughness finite fracture mechanics criterion for predicting the crack onset stress and the crack length at a stress raiser. The coupled FFM criterion has originally been proposed in Leguillon 24 and later successfully applied for modeling of fracture at geometrical discontinuities using point stress [25][26][27] or average stress [27][28][29][30][31][32] in a strength criterion. According to such a FFM approach, both the stress should exceed material strength and the incremental energy release rate (ERR) must reach its critical value for the fracture event to take place.…”

Section: Finite Fracture Mechanics Of Intralaminar Cracking Of a Ud Compositementioning

confidence: 99%

Analysis of the effect of a stress raiser on the strength of a UD flax/epoxy composite in off-axis tension

Modniks

Spārniņš

Andersons

et al. 2014

Journal of Composite Materials

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The effect of stress raisers in the form of a slit-like notch and an open circular hole on the tensile strength of a quasi-UD flax-fiber-reinforced composite is studied experimentally. A finite fracture mechanics approach is applied to determine the intralaminar fracture toughness of the composite and to predict the strength in the presence of stress concentration. Reasonably good agreement of the notch effect predicted using finite fracture mechanics with a coupled strength and toughness fracture criterion and test results is demonstrated.

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Section: Finite Fracture Mechanics Of Intralaminar Cracking Of a Ud Compositementioning

confidence: 99%

Analysis of the effect of a stress raiser on the strength of a UD flax/epoxy composite in off-axis tension

Modniks

Spārniņš

Andersons

et al. 2014

Journal of Composite Materials

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“…Therefore the objective of this paper is to present a new model that can predict the net-tension strength of a mechanically fastened joint without the use of a characteristic dimension. The model proposed is developed in the framework of the Finite Fracture Mechanics (FFM) [22][23][24][25][26][27][28][29][30].…”

Section: About Here]mentioning

confidence: 99%

A semi-analytical method to predict net-tension failure of mechanically fastened joints in composite laminates

Catalanotti

Camanho

2013

Composites Science and Technology

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A Finite Fracture Mechanics model is proposed to predict the net-tension strength of composite mechanically fastened joints. A modification of coupled stress-energy criteria is suggested to take properly into account the effect of the R-curve in determining the crack length corresponding to the unstable crack propagation. The proposed model works for quasi-isotropic laminates and it requires as input the longitudinal strength and the fracture toughness of the laminate. The predictions obtained show good agreement when compared with the experimental results.

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“…In order to circumvent this problem, therefore, alternative approaches have been discussed for prediction of the notched strength of a class of composite laminates without determination of the characteristic distance for each notched laminate configuration. 16–24 In particular, a coupled finite fracture mechanics criterion 20–24 that has recently been developed is attractive from an engineering point of view. The coupled finite fracture mechanics criterion is based on the assumption that a stress-based criterion and an energy-based criterion are simultaneously fulfilled for a finite advance of a self-similar crack.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic size effect law for notched strength of unidirectional carbon/epoxy laminates – Part 1: Formulation

Kawai

2016

Journal of Composite Materials

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A multiaxial quasi-brittle failure criterion for notched orthotropic composites is developed with an emphasis on establishment of an analytical formula to predict their anisotropic notched strength for any notch size under any multiaxial proportional loading. It is formulated by replacing the principal unnotched strengths with the principal notched strengths in the framework of the Tsai–Hill static failure criterion for orthotropic composites. The effects of notch size and specimen width on the principal notched strengths are described by means of the Suo-Ho-Gong model that can consider notch ductile-to-brittle transition. From the proposed multiaxial quasi-brittle failure criterion, an analytical formula is derived to predict the notched strength of finite orthotropic composite plates under multiaxial proportional loading at any angle with the principal directions of material anisotropy. The notched strength prediction formula involves a generalized notch sensitivity parameter that can be defined for any multiaxial state of stress. The multiaxial notch sensitivity parameter allows uniquely defining an intrinsic equivalent mode-I fracture toughness that is independent of notch size as well as of specimen width for any multiaxial proportional loading. Furthermore, an anisotropic size effect law for apparent equivalent mode-I fracture toughness that considers not only the effect of notch size but also the effect of specimen width is derived from the failure criterion. Finally, a quasi-brittle failure criterion for notched interface is briefly discussed as a particular case of the proposed quasi-brittle failure criterion for notched orthotropic composites.

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Finite fracture mechanics analysis of crack onset at a stress concentration in a UD glass/epoxy composite in off-axis tension

Cited by 38 publications

References 52 publications

Analysis of the effect of a stress raiser on the strength of a UD flax/epoxy composite in off-axis tension

Analysis of the effect of a stress raiser on the strength of a UD flax/epoxy composite in off-axis tension

A semi-analytical method to predict net-tension failure of mechanically fastened joints in composite laminates

Anisotropic size effect law for notched strength of unidirectional carbon/epoxy laminates – Part 1: Formulation

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