Abstract
A parametric study of the stress distribution in the composite plates is undertaken to show the effect of different lay-ups. Full 3-D elastic properties are required in the modelling. These properties are calculated using equations taken from the literature and derivation from simple Classical Laminate Plate Theory (CLPT). In previous experimental work, it was shown that tensile failure involved the development of a damage zone at the edge of the hole. In a double-lap joint, it is assumed that uniform stresses are exhibited throughout the plate thickness. Different lay-ups system give different tangential stress distributions and insignificant variation in the radial stress distribution along the hole boundary.
Highlights
In early finite element work, most of the researchers were working with 2-D finite element models and plane stress state following Classical Laminate Plate Theory (CLPT) theory
In early finite element work, most of the researchers were working with 2-D finite element models and plane stress state following CLPT theory
Hong and Raju [1] completed a parametric study on stress distributions around the hole boundary for a variation of W/d values to include bolt properties and contact between bolt and the laminate
Summary
In early finite element work, most of the researchers were working with 2-D finite element models and plane stress state following CLPT theory. Kontolatis [10] found that net-tension failures occurred with W/d ≤ 4 These initiated from the stress concentration at the hole edge perpendicular to the loading axis. The damage length in the cross-ply lay-up might be less than quasi-isotropic laminates as a result of a high proportion of tows in 0° direction compared to quasiisotropic laminates with identical thickness. This behaviour found by Manger [12] in the open-hole problem resulting in reduced critical damage zone length. Current work compares radial stress and tangential stress exhibited in woven fabric CFRP doublelap bolted joints between cross-ply and quasi-isotropic lay-ups. The understanding of stress distribution in composite material lay-ups with bolted joint configurations is essential prior to strength prediction works using finite element analysis
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