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Title: EFFECTS OF HETEROGENEITY ON THE STRENGTH OF 3D COMPOSITES

Monte Carlo simulation interpreted with theoretical modeling is used to study the statistical failure modes in unidirectional composites consisting of a hexagonal array of elastic fibers embedded in an elastic matrix. Composite structure is idealized using the chain-of-bundles model in terms of bundles of length {delta} arranged along the fiber direction. Fibers element strengths in {delta}-bundles are taken to be Weibull distributed and Hedgepeth and Van Dyke load sharing is assumed for transverse fiber break arrays. Simulations of {delta}-bundle failure reveal two regimes. When fiber strength variability is low, the dominant failure mode is by growing clusters of fiber breaks up to instability. When this variability is high, cluster formation is suppressed by a more dispersed fiber failure mode. Corresponding to these two cases, they construct simple models that predict the strength distribution of a {delta}-bundle. Their predictions compare very favorably with simulations in the two cases.
Authors:
; ;
Publication Date:
OSTI Identifier:
774568
Report Number(s):
LA-UR-01-843
TRN: AH200121%%84
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Feb 2001
Research Org:
Los Alamos National Lab., NM (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DISTRIBUTION; FIBERS; INSTABILITY; SIMULATION