Accession Number : ADA190039

Title :   An Investigation of the Failure Response of Laminates under Biaxial Stress.

Descriptive Note : Final rept. 1 Apr 86-31 Mar 87,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL AND INDUSTRIAL ENGINEERING

Personal Author(s) : Swanson, Stephen R

PDF Url : ADA190039

Report Date : Sep 1987

Pagination or Media Count : 34

Abstract : Advanced fiber composites are often used in laminate form in strength critical applications. However the ultimate strength of laminates is very poorly understood, primarily because of a lack of valid experimental data. A biaxial test specimen for laminates based on a tubular geometry was developed and used to determine the failure mechanics of two laminates. The results showed a failure process that includes matrix cracking, but this matrix cracking does not appear to directly affect fiber failure. Fiber failure in the laminate studied determines ultimate strength, and can be predicted based on either a maximum fiber stress of fiber strain criterion applied on a ply level. Keywords: Composite materials, Laminate failure, Biaxial stress.

Descriptors :   *FAILURE(MECHANICS), *FIBER REINFORCED COMPOSITES, BIAXIAL STRESSES, COMPOSITE MATERIALS, CRACKING(FRACTURING), EXPERIMENTAL DATA, FAILURE, FIBERS, LAMINATES, MATRIX MATERIALS, RESPONSE, STRENGTH(GENERAL), STRESSES, TUBULAR STRUCTURES, BIAXIAL STRESSES, MICROCRACKING, SYMPOSIA

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE