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Mechanics of Fracture Initiation and Propagation

Surface and volume energy density applied as failure criterion

  • Book
  • © 1991

Overview

Authors:
  1. G. C. Sih

    1. Institute of Fracture and Solid Mechanics, Lehigh University, Bethlehem, USA

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Part of the book series: Engineering Applications of Fracture Mechanics (EAFM, volume 11)

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Table of contents (9 chapters)

  1. Front Matter

    Pages i-xxii
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  2. A special theory of crack propagation

    • G. C. Sih
    Pages 1-22

  3. A three-dimensional strain energy density factor theory of crack propagation

    • G. C. Sih
    Pages 23-56

  4. Strain energy density theory applied to plate-bending and shell problems

    • G. C. Sih
    Pages 57-98

  5. Dynamic crack problems — strain energy density fracture theory

    • G. C. Sih
    Pages 99-125

  6. Strain energy density and surface layer energy for blunt cracks or notches

    • G. C. Sih
    Pages 126-181

  7. Thermoelastic and hygrothermoelastic behavior of cracks

    • G. C. Sih
    Pages 182-212

  8. Failure of composites as predicted by the strain energy density theory

    • G. C. Sih
    Pages 213-270

  9. Experimental fracture mechanics: strain energy density criterion

    • G. C. Sih
    Pages 271-306

  10. Isoenergy density theory: exchange of surface and volume energy

    • G. C. Sih
    Pages 307-403

  11. Back Matter

    Pages 405-410
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Keywords

About this book

The assessment of crack initiation and/or propagation has been the subject of many past discussions on fracture mechanics. Depending on how the chosen failure criterion is combined with the solution of a particular theory of continuum mechanics, the outcome could vary over a wide range. Mod­ elling of the material damage process could be elusive if the scale level of observation is left undefined. The specification of physical dimension alone is not sufficient because time and temperature also play an intimate role. It is only when the latter two variables are fixed that failure predictions can be simplified. The sudden fracture of material with a pre-existing crack is a case in point. Barring changes in the local temperature,* the energy released to create a unit surface area of an existing crack can be obtained by considering the change in elastic energy of the system before and after crack extension. Such a quantity has been referred to as the critical energy release rate, G e, or stress intensity factor, K Ie. Other parameters, such as the crack opening displacement (COD), path-independent J-integral, etc. , have been proposed; their relation to the fracture process is also based on the energy release concept. These one-parameter approaches, however, are unable simultaneously to account for the failure process of crack initiation, propagation and onset of rapid fracture. A review on the use of G, K I, COD, J, etc. , has been made by Sih [1,2].

Authors and Affiliations

  • Institute of Fracture and Solid Mechanics, Lehigh University, Bethlehem, USA

    G. C. Sih

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