... of Stress Intensity Factors by a Modified Crack-Closure Integral ,” Engineering Fracture Mechanics , Vol. 9 , 1977 , pp. 931 - 938 . Irwin , G. R. , “ Analysis of Stresses and Strains Near the End of a Crack Traversing a Plate ,” Engineering Journal of Applied Mechanics , Vol. 24 , 1957...

... life data were used to generate an onset fatigue life P-N curve for matrix cracking. The resulting prediction was in good agreement with measured data from the fatigue tests. In a third step, a fracture mechanics approach based on geometrically nonlinear analysis was used to determine the relationship...

... life data were used to generate an onset fatigue life P-N curve for matrix cracking. The resulting prediction was in good agreement with measured data from the fatigue tests. In a third step, a fracture mechanics approach based on geometrically nonlinear analysis was used to determine the relationship...

.... These values can then be compared to the ‘global’ strain energy release rates calculated in the usual manner from the globally applied conditions using Linear Elastic Fracture Mechanics (LEFM). The fixture that has been developed can accommodate full size standard delamination specimens, which can be loaded...

... of the study are summarized in recommendations for the MMB test procedure and its subsequent evaluation. composite materials mixed-mode bend test strain energy release rate Mode I Mode II delamination tests fracture mechanics beam theory> References Reeder , J. R. and Crews , , J...

... to estimate the unnotched strength and a large-scale crack bridging analysis is used to predict the notched strength. compressive failure composites fracture mechanics cohesive zone model microbuckling References Argon , A. S. , “ Fracture of Composites ,” Treatise of Material Science...

... of the specimen has been deduced to be mode III from fracture mechanics principles. The torsional behavior and the corresponding fracture parameter G III C have been analyzed on the basis of plate torsion and laminate theory. Edge crack torsion tests were performed to measure G III C of several carbon fiber/epoxy...

...LN McCartney The fracture mechanics are established for a large plate containing an embedded crack of finite length taking account of: (1) the anisotropy of the material, (2) the effect of residual stresses arising from isothermal temperature changes, and (3) the effect of tractions applied...

...McCartney LN A fracture mechanics analysis valid for long cracks is applied to three crack-bridging problems that arise in the composites area, namely, (1) matrix cracking in perfectly bonded unidirectional composites, (2) transverse cracking in perfectly bonded cross-ply laminates, and (3) matrix...

... Singularities and Solution Structure. Part II--DelaminationBehavior and Fracture Mechanics Parameters," NASA CR 172269 and CR 172270, Nov. 1983. [13] Whitcomb, J. D., "Predicted and Observed Effects of Stacking Sequence and Delamination Size on Instability-Related Delamination Growth," Journal of Composites...

...-reinforced composites, strain energy release rate, delamination, graphite epoxy, fracture mechanics pUTER SUBLAMINATES In Part I of this paper 5 an analysis method based on a transverse shear deformation theory and a sublaminate approach was developed to analyze the mixed-mode edge delamination specimen...

... epoxy, fracture mechanics Delaminations along the free edges of laminates subjected to tensile loading have been observed during testing and in service. The presence of delamination, initiated by interlaminar stresses, causes redistribution of the stresses among plies in a laminate and, therefore...

.... Matrix cracking was shown to have a considerable influence on residual stiffness of glass epoxy laminates and could be predicted reasonably well for cracks in 90° plies using a simple shear lag analysis. A fracture mechanics analysis for the strain energy release rate associated with 90° ply matrix crack...

... energy release rate, fracture mechanics Much attention has recently been focused on the understanding of the delamination behavior of composite materials. Composite delamination is a potential failure mode at ply drop-offs, edges, holes, and in the area of impact damage. Therefore, the delamination...

... at room-temperature ambient conditions. KEYWORDS: residual stress, moisture, graphite composites, strain energy release rate, delamination, graphite epoxy, fracture mechanics Nomenclature [A] Extensional stiffness matrix A Delaminated area u Delamination size IBI Coupling stiffness matrix b Half width...

.... adhesive bonding composite materials delamination debonding stacking sequence fatigue (materials) fracture mechanics References Matthews , F. L. , Kilty , P. F. , and Godwin , E. W. , “ A Review of the Strength of Joints in Fiber-Reinforced Plastics, Part 2—Adhesively Bonded...

..., fracture mechanics, fracture toughness, damage tolerant design, thick laminates The fracture behavior of notched laminated composites has been the subject of numerous investigations during the last 15 years. These investigations have attempted to address two fundamental issues. First, is there a material...

...ASD Wang This paper presents an overview of a fracture-mechanics approach to some of the most frequently encountered matrix-dominated sublaminate cracks in epoxy-based composite laminates. By “sublaminate,” it is meant that the cracks are internal to the laminate, generally invisible...