Application of the principles of linear fracture mechanics to the composite materials

Parhizgar, Shahrokh; Zachary, L. W.; Sun, C.T.

doi:10.1007/bf00942161

Cited by 59 publications

(25 citation statements)

References 6 publications

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“…The plate was loaded in such a way that the tractions exactly corresponded to the well known first term of the asymptotic expansion for model I for an orthotropic material [18] …”

Section: Discussion and Numerical Examplementioning

confidence: 99%

Micromechanical elastic cracktip stresses in a fibrous composite

Fish

Fares²,

Nath

1993

Int J Fract

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This paper presents elastic stress distributions near a cracktip in a continuous fiber composite. The material heterogeneity is explicitly accounted for by using the finite element method and a new Mesh Superposition Technique. This new technique superposes a fine mesh with heterogeneous material properties over a coarse mesh with homogeneous ones. The results indicate that the load transferred by fibers near a cracktip may be well described by the homogeneous orthotropic elastic K~ field. A technique to postprocess the K~ field to accurately obtain the detailed stress distributions within the fiber and matrix is also presented.

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“…The plate was loaded in such a way that the tractions exactly corresponded to the well known first term of the asymptotic expansion for model I for an orthotropic material [18] …”

Section: Discussion and Numerical Examplementioning

confidence: 99%

Micromechanical elastic cracktip stresses in a fibrous composite

Fish

Fares²,

Nath

1993

Int J Fract

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“…First of all, an assumption should be made that the failure process in the composite materials takes place in a brittle fashion. For the normal epoxy resin composites in use, it is true and can be verified by the fact that there exists a distinct point of instability on the load versus deflection curves [19].…”

Section: Application To Notched Off-axis Unidirectional Compositesmentioning

confidence: 95%

“…In order to assess the rationality of the criteria discussed previously in the prediction of crack extension, those (strain-energy-density criterion, normal-stress-ratio, and energy-release rate model) are applied to characterize the fracture of notched, off-axis, and unidirectional glass/epoxy [19] and graphite/epoxy [20] composites. Due to the conceptual limitations of the tensor-polynomial strength criterion, it will not be discussed here.…”

Section: Application To Notched Off-axis Unidirectional Compositesmentioning

confidence: 99%

On non-coplanar crack-extension in unidirectional composites

1991

Int J Fract

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The goal of this study is to gain a better understanding of the parameters affecting non-coplanar crack-extension in unidirectional composites. The physical points of several criteria (the strain-energy-density theory, the normal-stress-ratio criterion, the tensor polynomial failure theory, and the energy-release-rate model) are reviewed. The correlations between the theoretical predictions and some experimental results are presented. Specific emphasis is placed on finding a consistent criterion for predicting the non-coplanar crack-extension. After comparisons, it is determined that the energy-release-rate criterion based on the global energy balance and the normal-stress-ratio theory show an ability to predict non-coplanar crack-extension in unidirectional composites.

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“…Parhizgar et.al. [32] showed that intralaminar fracture toughness depends on fiber orientation, the value of K IC being twice for 90 0 oriented fibers then 0 0 oriented fibers, even though the failure is due to matrix cracking. Jose et.…”

Section: Intralaminar Fracture Toughnessmentioning

confidence: 99%