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Title: Comparison of methods for predicting fiber stresses in a cracked Kevlar/epoxy monolayer

Shear-lag and 3-D finite element predictions for the fiber stresses in a cracked Kevlar 49/epoxy monolayer are compared. Results are given for a 5-fiber wide monolayer containing a single broken fiber. Both methods of analysis are found to predict nearly the same fiber stress distribution along the crack-tip fiber when the monolayer is fully elastic. Results for highly loaded monolayers with extensive matrix yielding are not in quite as good agreement, but even then the predicted stress distributions are within 5%. These calculations show that a shear-lag analysis is accurate even though the Kevlar 49 fiber is highly anisotropic.
Authors:
Publication Date:
OSTI Identifier:
6337526
Report Number(s):
SAND-84-0867C; CONF-841201-11
ON: DE84016118
DOE Contract Number:
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: ASME winter annual meeting, New Orleans, LA, USA, 9 Dec 1984
Research Org:
Sandia National Labs., Albuquerque, NM (USA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; FIBERS; STRESSES; ARAMIDS; EPOXIDES; LAYERS; MATERIALS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; SYNTHETIC MATERIALS 360303* -- Composite Materials-- Mechanical Properties-- (-1987)