Dynamic crack bifurcation in PMMA

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Title: Dynamic crack bifurcation in PMMA
Authors: Murphy, Neal
Ali, M.
Ivankovic, Alojz
Permanent link: http://hdl.handle.net/10197/4908
Date: Nov-2006
Abstract: An investigation of the branching characteristics of small PMMA single edge notched tensile (SENT) specimens is presented. The influence of notch depth and specimen thickness was examined and it was found that branching only occurred for thicker specimens and very short notch depths. The location at which successful branching occurred was very consistent for a given notch depth. Subsequently, however, a statistical variation of branching patterns was observed. A series of simulations was then performed to provide further insight into these tests and in particular to examine the evolution of the fracture process region ahead of the running crack. A finite volume/cohesive zone formulation was used to model micro-crack nucleation and dynamic interaction in the process zone. The cohesive strength and fracture resistance were estimated from unnotched tensile tests and the application of LEFM to the notch test data. Even though a very simple criterion was used to govern the insertion and subsequent behaviour of the cohesive surfaces in the model, many of the experimental observations were reproduced, including high frequency oscillations in crack velocity, the substantial increase in the fracture surface area due to the formation of subsurface micro-cracks, and the location at which successful branching took place.
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2006 Elsevier
Keywords: Dynamic fracture;Branching;Finite volume method;Cohesive zone;Process region
DOI: 10.1016/j.engfracmech.2006.06.008
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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