Mode-mixity in beam-like geometries:  global partitioning with cohesive zones

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Title: Mode-mixity in beam-like geometries:  global partitioning with cohesive zones
Authors: Conroy, Mark
Ivankovic, Alojz
Karac, Aleksandar
et al.
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Date: 2013
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
Keywords: Adhesive jointsComposite laminatesMixed mode testFixed ratio mixed mode test
Language: en
Status of Item: Not peer reviewed
Conference Details: 36th Annual Meeting of The Adhesion Society, Inc. Daytona Beach, Fl, USA, 2013.
Appears in Collections:Mechanical & Materials Engineering Research Collection

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