..., delamination, end-notched flexure specimens (ENF), interlaminar fracture toughness, cracks Delamination along various ply interfaces is a major source of damage in laminated composites. An understanding of this behavior resides in an accurate characterization of the interlaminar fracture toughness. Generally...

...YJ Chiang; RE Rowlands The presence of a flaw or crack near a bolt-loaded hole can significantly reduce the strength of a mechanical joint. Stress intensity factors of mixed-mode cracks emanating from a bolt-loaded hole in a loaded finite composite are evaluated here using the finite element method...

... laminates, cracks, stress The tensile strength of composite laminates containing circular holes or straight cracks has been the subject of study for the past 20 years. Whitney et al. [1-3] have obtained approximate solutions to the stress distribution in an orthotropic plate containing a circular hole...

... techniques: the virtual crack-closure technique (VCCT) and the rate of change of compliance with crack length (compliance derivative method). The analysis was performed for various crack-length-to-semispan ( a/L ) ratios ranging from 0.2 to 0.9. Three material systems representing a wide range of material...

... that the skew cracks in the proximal layers are primarily due to transverse shear stress. Skew cracks in the middle layers are also due to transverse shear stress. Vertical cracks in the distal layer are due to flexural stress transverse to the fiber orientation of the layer. S. P. Joshi I and C. T. S u n 2...

...S Mall; NK Kochhar A finite-element analysis of the end-notch flexure speciment for Mode II interlaminar fracture toughness measurement was conducted. The effects of friction between the crack faces and large deflection on the evaluation of G IIc from this specimen were investigated. Results...

... of the critical strain energy release rate G c was measured for mixed-mode crack propagation along the fibers in off-axis specimens and in rail shear tests. By varying the off-axis angle, crack propagation occurred under different K I / K II ratios. It was observed that both moisturization of T300/1034 and change...

... affect the failure modesignificantlywithoutaffecting the failure load. KEYWORDS: compositematerials, damage, cracks, slots, compressive loading,postbuckling, shear crippling Current design practices for some metallic plates used in aircraft often rely on the postbuckling strength of these plates...

...RD Kriz Large quantities of nonmetallic woven composites will be used in magnetic fusion energy (MFE) structures at low temperatures. Understanding variations in mechanical properties will provide useful information to the MFE designer. Here we study the influence of crack formation, residual...

...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...

... and propagation of the transverse cracks and delamination cracks and also given some details that cannot be obtained macroscopically. The transverse cracks are perpendicular to lamina interfaces when there is no delamination nearby, while transverse cracks grow obliquely to interfaces when they are accompanied...