ISSN: 0884-6804
Page Count: 8

On the Off-Axis Tension Test for Unidirectional Composites
Herakovich, CT
Graduate student and professor, Virginia Polytechnic Institute and State University, VA

Post, D
Graduate student and professor, Virginia Polytechnic Institute and State University, VA

Nemeth, MP
Graduate student and professor, Virginia Polytechnic Institute and State University, VA

Abstract

The off-axis tension test was examined experimentally to obtain actual displacement fields over the surface of graphite-polyimide coupon specimens; the experimental results were compared with the approximate analytical solution of Pagano and Halpin and newly generated finite-element results. A new optical method of high-sensitivity moiré interferometry was used to determine the actual displacements to high precision. It is shown that the approximate analytical solution and the finite-element results compare very favorably with the measured centerline displacements in the test section, and the finite-element displacement fields provide excellent agreement with the moiré displacements throughout the specimen. Results are presented for a 15° fiber orientation and coupon aspect ratios of 5 and 15.

Keywords:
composites, moiré effects, displacement, stresses, theories, experimentation, off axis, finite elements

Paper ID: CTR10794J
DOI: 10.1520/CTR10794J
ASTM International is a member of CrossRef.