Finite element estimation of elastic interlaminar stresses in laminates

Govindarajan, R and Krishna Murty, AV and Vijayakumar, K and Raghuram, PV (1993) Finite element estimation of elastic interlaminar stresses in laminates. In: Composites Engineering, 3 (5). pp. 451-466.

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Abstract

Low interlaminar strength and the consequent possibility of interlaminar failures in composite laminates demand an examination of interlaminar stresses and/or strains to ensure their satisfactory performance. As a first approximation, these stresses can be obtained from thickness-wise integration of ply equilibrium equations using in-plane stresses from the classical laminated plate theory. Implementation of this approach in the finite element form requires evaluation of third and fourth order derivatives of the displacement functions in an element. Hence, a high precision element developed by Jayachandrabose and Kirkhope (1985) is used here and the required derivatives are obtained in two ways. (i) from direct differentiation of element shape functions; and (ii) by adapting a finite difference technique applied to the nodal strains and curvatures obtained from the finite element analysis. Numerical results obtained for a three-layered symmetric and a two-layered asymmetric laminate show that the second scheme is quite effective compared to the first scheme particularly for the case of asymmetric laminates.

Item Type:	Journal Article
Publication:	Composites Engineering
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	10 Feb 2011 05:28
Last Modified:	10 Feb 2011 05:28
URI:	http://eprints.iisc.ac.in/id/eprint/35475

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