Accession Number:

ADA007352

Title:

Combined Stress Effects upon Failure of Fiber Composites.

Descriptive Note:

Final rept. Jul 73-Apr 74,

Corporate Author:

MATERIALS SCIENCES CORP BLUE BELL PA

Report Date:

1974-04-01

Pagination or Media Count:

90.0

Abstract:

The cumulative weakeningaxial shear crack model for axial tensile and shear failure of unidirectional fiber composite layers is extended to general plane stress states for materials having one boronepoxy and many graphiteepoxy fibers through the thickness of a layer. The resulting failure surface is concave due to unstable shear crack propagation, and results in considerably different failure predictions from the usual maximum stress, maximum strain, or quadratic interaction criteria. Application of this heterogeneous failure criterion is made to failure analysis of laminates using linear and nonlinear laminate analysis techniques. An experimental program to test the heterogeneous unidirectional lamina failure theory is proposed.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE