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Irwin fracture model

There are two principal theories, or models, that attempt to describe what happens during brittle fracture, the Griffith fracture theory and the Irwin model. Both assume that fracture takes place through the presence of preexisting cracks or flaws in the polymer and are concerned with what happens near such a crack when a load is applied. Each leads to the definition of a fracture-toughness parameter and the two parameters are closely related to each other. The Griffith theory is concerned with the elastically stored energy near the crack, whereas the Irwin model is concerned with the distribution of stresses near the crack. Both theories apply strictly only for materials that are perfectly elastic for small strains and are therefore said to describe linear fracture mechanics. [Pg.235]

Linear elastic fracture mechanics (including the Irwin model of confined plasticity, the line-zone or Dugdale model and viscoelastic effects)... [Pg.3462]

Although Equation (12.18a) is more empirically based than Equation (12.18) and is not formally equivalent, it has been shown to model fracture results very well. Moreover, in this formulation w relates to the size of the so-called Irwin plastic zone Ty, which can be defined simply on the basis of Equation (12.3) by assuming that a point Vy the stress reaches the yield stress Oy. Hence... [Pg.285]


See other pages where Irwin fracture model is mentioned: [Pg.360]    [Pg.73]    [Pg.373]    [Pg.450]    [Pg.522]    [Pg.186]   
See also in sourсe #XX -- [ Pg.237 , Pg.240 ]




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