Accession Number : ADA321181

Title :   Reduced Stiffness Method for Onset of Delamination.

Descriptive Note : Final rept.,

Corporate Author : CENTRE FOR MECHANICAL ENGINEERING TNO DELFT (NETHERLANDS)

Personal Author(s) : VAN DEN Eikhoff, J.

PDF Url : ADA321181

Report Date : 30 AUG 1996

Pagination or Media Count : 24

Abstract : The reduced stiffness method has been used to determine the onset of delamination for a number of different layups of AS4/3501.6, T300/934 and T300/520S graphite epoxy plates. The results are very good. The advantage is that it is not necessary to calculate detailed stresses in the third direction and to calculate local stresses at the surface of the plate. In order to make the method applicable for the Finite Element Method it is necessary to investigate situations with varying stresses. Also it is likely, that the onset of delamination will be different for the stresses in the two perpendicular directions of the laminate. In cases where both stresses are near to the delamination initiation stress, the two probably will interact. Also the interaction between transverse matrix cracking and delamination has to be investigated further.

Descriptors :   *DELAMINATION, *GRAPHITE EPOXY COMPOSITES, STRESS ANALYSIS, NETHERLANDS, FINITE ELEMENT ANALYSIS, STIFFNESS, CRACKING(FRACTURING), DAMAGE ASSESSMENT, MATRIX MATERIALS, CONTINUUM MECHANICS, EPOXY LAMINATES.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE