Free Edge Stresses in Elastic and Viscoelastic Composites Under Uniaxial Extension, Bending, and Twisting Loadings

[+] Author and Article Information
Sung Yi

School of Mechanical and Production Engineering, Nanyang Technological University, Singapore, 639798 Republic of Singapore

H. H. Hilton

Aeronautical and Astronautical Engineering Department and National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2935

J. Eng. Mater. Technol 119(3), 266-272 (Jul 01, 1997) (7 pages) doi:10.1115/1.2812255 History: Received December 20, 1996; Revised April 15, 1997; Online November 27, 2007


Time-dependent interlaminar stresses in elastic and viscoelastic laminated composites subjected to arbitrary combinations of axial extension, bending and/or twisting loads are obtained based on integral constitutive relations and Pipes and Pagano’s displacement field for laminates under a generalized plane deformation state. Numerical results obtained from the present formulation are compared against experimental data and excellent agreement within two percent was obtained between these results. Time-dependent interlaminar stresses for cross-ply and angle-ply laminates subjected to uniaxial extension, bending and twisting are also presented. Appreciable stress relaxation occurred during the loading period resulting in decreased magnitudes of residual stresses. It is seen that the rate of interlaminar shear stress relaxation is greater than the normal one, since the relaxation of shear moduli is larger than that of the normal moduli.

Copyright © 1997 by The American Society of Mechanical Engineers
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