Abstract
Progressive failure behaviour of laminated composite skewed hypar shells is investigated in this paper through finite element approach. For composite materials which are weak in transverse shear, failure may initiate at any inner lamina or interface and may remain undetected and unattended to. Such latent damages may progress gradually and lead to a sudden total ply failure. An iterative method is adopted using the various failure theories to predict the first ply failure load. After the first ply failure, the stiffness of the failed element is totally discarded from the laminate and the remaining laminate is considered for further analysis. The developed finite element code is validated through solution of a benchmark problem. Numerical experiments are carried out to obtain the first ply and progressive failure of simply supported hypar shells under transverse distributed load. While obtaining the failure loads, the shell is considered to be under plane stress condition and in linear elastic range. Results are studied meticulously to extract a set of conclusions of practical significance regarding the failure characteristics of composite hypar shells.
Highlights
In modern engineering and technology, a composite is defined as a material composed of stacked layers with fiber reinforcement held in proper location with the rigid binder
After the first ply failure (FPF), the stiffness of the failed element is totally discarded from the laminate and the remaining shell is considered for further analysis
The present finite element code is capable of successfully assessing the first ply and progressive failure behaviour of laminated composite skewed hypar shells with supported boundary condition
Summary
In modern engineering and technology, a composite is defined as a material composed of stacked layers with fiber reinforcement held in proper location with the rigid binder. A skewed hypar shell is aesthetically appealing and being doubly ruled is easy to cast This configuration can allow entry of north light and due to this advantage it finds use as roofing units in practical civil engineering applications. The progressive failure analysis of laminated composite plates under transverse static loading was carried out in linear and elastic range by Pal and Ray [12]. Stiffened composite panels under static loadings were investigated by Prusty [16] using the geometric and material linearity It is noted from the literature review that the failure aspects of industrially important hypar shell is totally missing. To fulfill this lacuna the present investigation intends to study the failure progress of hypar shell by a linear finite element approach from practical engineering point of view
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