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08~chapter 08

# 08~chapter 08 - Materials engineering science processing...

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Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon

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Strength vs.Toughness Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 8.1 Strength Resistance of a material to plastic flow Toughness Resistance of a material to the propagation of a crack
Testing for Toughness Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 8.2 This type of test provides a comparison of the toughness of materials – however, it does not provide a way to express toughness as a material property

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Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon Figure 8.3 The local stress σ local is proportional to the number of lines of force which rises steeply as the crack tip is approached c – crack length r – distance from crack tip σ – remote stress Y – geometric constant Remote stress applied to a cracked material: * valid when r << c
Stress Intensity Factor Materials: engineering, science, processing and design, 2nd edition Copyright (c)2010 Michael Ashby, Hugh Shercliff, David Cebon For any value of r, the local stress scales with σ√ π c Mode 1 stress intensity factor Mode 1 indicates tensile loading normal to the crack • Typically, loading modes are designated by Roman numerals – K 1 would be designated as K I – K 1 is used throughout the book which goes against the universally accepted use of Roman numerals

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Fracture Toughness
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08~chapter 08 - Materials engineering science processing...

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