Accession Number : ADA303149

Title :   On the Off-Axis Tensile Test for Unidirectional Composites,

Descriptive Note : Interim rept. no. 28,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS

Personal Author(s) : Nemeth, Michael P. ; Herakovich, Carl T. ; Post, Daniel

PDF Url : ADA303149

Report Date : APR 1982

Pagination or Media Count : 33

Abstract : The off-axis tensile 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 moire 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 moire displacements throughout the specimen. Results are presented for a 15 degree fiber orientation and coupon aspect ratios of 5 and 15. (MM)

Descriptors :   *FIBER REINFORCED COMPOSITES, COMPOSITE MATERIALS, FINITE ELEMENT ANALYSIS, DISPLACEMENT, ELASTIC PROPERTIES, ORIENTATION(DIRECTION), GRAPHITE, STRENGTH(MECHANICS), OPTICAL INTERFEROMETERS, ASPECT RATIO, TENSILE TESTERS, ANALYTIC FUNCTIONS, UNIDIRECTIONAL, POLYIMIDE PLASTICS, MOIRE EFFECTS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE