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Publicações
Chaudhuri, R.A., Oktem, A.S. e Guedes Soares, C. (2013), “Stress Concentration/Intensity around Elliptical/Circular Cylinder Shaped Surface Flaws in Thin Cross-Ply Plates and St. Venant’s Principle”, Applied Mathematical Modelling, Vol. 37, pp. 1362-1377
Effects of localized surface flaws in both metallic and laminated composite materials are computationally investigated. A Co-type triangular composite plate element, based on the assumptions of transverse inextensibility and layer-wise constant shear-angle theory (LCST) is employed to analyze an edge-loaded laminated plate weakened by an external part-through elliptical cylindrical slot or hole. A homogenous isotropic plate weakened by a similar part-through elliptical cylinder shaped surface flaw is analyzed as a special case of the above. Numerical results for a cross-ply laminate compromised by the presence of an external part-through circular cylindrical slot indicate the existence of severe cross-sectional warping in the vicinity of the slot and plate boundaries. Furthermore, three-dimensional nature of the stress concentration factor in the neighborhood of the external part-through elliptical cylinder shaped surface flaw boundary is clearly exhibited. Besides, very high stress concentration factors are found in the layer weakened by the part-through elliptical cylindrical slot. Most importantly, the effects of stress singularity in the neighborhood of the circumferential re-entrant corner lines of the part-through external holes weakening both homogeneous isotropic and laminated composite plates are numerically assessed, because of its role in crack initiation. Finally, for a cross-ply laminate compromised by the presence of an external part-through elliptical cylindrical hole in the outer layer, its interaction with free edge stress singularity at the plate boundary, and the implication of such interactions (i.e., violation of St. Venant's principle) in regards to testing of laminated composite specimens are thoroughly investigated.
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