An Experimental and Numerical Investigation of the Mixed-mode Fracture Toughness and Lap Shear Strength of Aerospace Grade Composite Joints

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Title: An Experimental and Numerical Investigation of the Mixed-mode Fracture Toughness and Lap Shear Strength of Aerospace Grade Composite Joints
Authors: Mohan, Joseph
Karac, Aleksandar
Murphy, Neal
et al.
Permanent link: http://hdl.handle.net/10197/4767
Date: 2011
Abstract: The increasing use of composite materials in various industries, such as aerospace, automotive and renewable energy generation, has driven a need for a greater understanding of the fracture behaviour of bonded composite joints. An important prerequisite for the adhesive bonding of composites is the existence of a uniform surface free from contaminants and mould release agents. While there are several ways in which this may be achieved, the use of peel plies has emerged as the preferred choice for many industries due to the repeatable nature of the resulting surface, particularly in the highly regulated aerospace industry. However, the use of peel plies can present some problems. It is possible that contamination from the peel ply can be transferred to the composite substrate and adversely affects the adhesive joint [1]. Composite joints are typically evaluated using lap shear type tests. While these tests are relatively simple to perform and post-process compared to their fracture mechanics based counterparts, the results can often be misleading and are greatly dependent on the overlap length, the thickness of the substrate and the type of fillet employed [2, 3]. The aim of this work is to show that composite joint systems can be modelled using material properties determined from fracture mechanics based tests. The fracture parameters will be used to develop numerical models of the fracture tests that accurately predict the wide-area lapshear test.
Type of material: Conference Publication
Publisher: Adhesion Society
Copyright (published version): 2011 the authors
Keywords: Mixed-mode fracture toughness;Aerospace grade composite joints
Language: en
Status of Item: Peer reviewed
Conference Details: 34th Annual Meeting of the Adhesion Society, Savannah, Georgia, USA, 13-16 February 2011
Appears in Collections:Mechanical & Materials Engineering Research Collection

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