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Fracture Mechanics of Non-Metallic Materials [and Discussion]

J. G. Williams and T. J. Patrick
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 299, No. 1446, Fracture Mechanics in Design and Service: 'Living With Defects' (Jan. 23, 1981), pp. 59-72
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/36732
Page Count: 14
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Fracture Mechanics of Non-Metallic Materials [and Discussion]
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Abstract

An outline of linear elastic fracture mechanics (l.e.f.m.) is given with an emphasis on those aspects most relevant to non-metallic materials. Provided that the nonlinear zone of energy absorption surrounding the crack tip is small compared with other dimensions, then a Kc or Gc value may be used. A simple extension of this concept can include elastically nonlinear materials such as rubber. Examples of the use of this method are then given for polymers, rubber and wood, and include some discussion of the difficulties involving plane strain-plane stress transitions. The role of Kc as a characterizing parameter in time-dependent, fatigue and environmental behaviour is then described with several examples, and it is concluded that plane strain fractures may be achieved with a wide range of values for any material. The consequences of this in choosing a design criterion are then discussed.

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