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Mode-mixity in beam-like geometries: global partitioning with cohesive zones
Date Issued
2013
Date Available
2013-10-31T09:18:15Z
Abstract
In-service adhesive joints and composite laminates are
often subjected to a mixture of mode I (tensile opening)
and mode II (in-plane shear) loads. It is generally accepted
that the toughness of such joints can vary depending on the
relative amounts of mode I and mode II loading present.
From a design perspective, it is therefore of great importance
to understand and measure joint toughness under a
full range of mode-mixities, thus obtaining a failure locus
ranging from pure mode I to pure mode II. The pure mode
toughnesses (I, II) can be measured directly from experimental
tests. The most common tests being the double cantilever
beam (DCB) for mode I and end loaded split (ELS)
for mode II. Unfortunately, the analysis of a mixed mode
test is not straightforward. In any mixed mode test, one
must apply a partition in order to estimate the contributions
from each mode. The particular test under study in this
work is the fixed ratio mixed mode test (FRMM) with a
pure rotation applied to the top beam (fig. 1). In this test, a
range of mode-mixities can be obtained by varying γ,
where γ is the ratio of h1/h2. This test is normally analysed
using analytical or numerical methods, each of which suffers
from a number of uncertainties. The present work attempts
to shed some light on both analytical and numerical
approaches and ultimately develop a testing protocol and
recommendations for the accurate determination of modemixity
in this FRMM test and other similar beam-like
geometries.
Type of Material
Conference Publication
Publisher
Adhesion Society
Copyright (Published Version)
2013 the authors
Language
English
Status of Item
Not peer reviewed
Conference Details
36th Annual Meeting of The Adhesion Society, Inc. Daytona Beach, Fl, USA, 2013.
This item is made available under a Creative Commons License
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