Interactive Resource icon  Fracture Toughness: Stresses around a Crack

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Description: The animation shows distribution of stresses around a crack. Around the crack there is a region of almost no stress (since there can be no stress acting on the free surface of the crack). At the crack tip, the stress is greater than the average stress. Far away from the crack, the stress can be assumed to be uniformly distributed. If the crack grows, the volume of the stress free region will increase. The strain energy will therefore be relieved in the new stress free material. This reduction in strain energy can drive further crack growth.
Keywords: fracture toughness • crack • stress
Categories: Science approaches > Deformation & failure > Fracture
Materials > Metals & alloys > Aluminium & alloys
Properties > Mechanical & thermal
Testing, analysis & experimentation > Mechanical testing
Created by: Hugh Shercliff, University of Cambridge
Joseph Robson, Manchester Materials Science Centre
MATTER, The University of Liverpool
Contributions: John Humphreys, Manchester Materials Science Centre
Christian Leppin, Alcan Fabrication Europe
Published by: European Aluminium Association, Brussels
License: This resource is released under the Creative Commons Attribution Non-Commercial No Derivatives license (2.0 UK: England & Wales).
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Date created: 21 September 2004
Date added: 09 June 2010
Resource ID: 2838