Accession Number:

ADA234189

Title:

Creep Buckling of Thermoplastic-Matrix Fiber Composites under Biaxial Loading

Descriptive Note:

Technical rept.

Corporate Author:

NATIONAL CENTER FOR COMPOSITE MATERIALS RESEARCH URBANA IL

Personal Author(s):

Report Date:

1989-12-01

Pagination or Media Count:

46.0

Abstract:

An analytical study has been conducted to investigate the elevated- temperature creep buckling behavior of thermoplastic-matrix composite laminates subjected to multiaxial loading. Anisotropic time-temperature dependent viscoelastic constitutive equations of the composite are constructed first, using the experimental results and the modified Prony series expansion solution. Creep buckling loads and associated creep failure times are determined by a time-dependent bifurcation buckling analysis of the thermoplastic composite laminates under general loading in an elevated-temperature environment. Detailed solutions for high-temperature creep buckling and associated failure mode shapes of the AS4J1 thermoplastic composite laminates with various fiber orientations are obtained. The creep buckling mode shape changes and the accompanying failure loads are studied for three commonly encountered loading modes 1 pure shear, 2 biaxial compression with any arbitrary stress biaxiality ratios, and 3 combined axial compression and shear loading.

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE