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Irwin-Kies relationship

Equation (8.27) is known as the Irwin-Kies relationship and it allows Gc to be determined experimentally provided that dSjdl can be determined experimentally or theoretically. Equation (8.27) then leads to an expression relating Go to the crack length I and the applied force F, or the distance x. [Pg.238]

Once the crack starts to propagate dS/dl increases, so that the force required to satisfy the Irwin-Kies relationship falls. The crack therefore propagates extremely rapidly across the sample and the reaction force of the sample on the hammer falls rapidly to zero. If the stored energy corresponding to Fo is Uo then... [Pg.245]

Show how the Irwin-Kies relationship can be derived by considering the load-extension curve for a specimen with a central crack. Use this relationship to calculate the load that must be applied to a double cantilever beam specimen of half-width 1 cm and thickness 3 mm to cause a crack of initial length 8 cm to begin to propagate, given that the fracture toughness. Sqc is 2 MN... [Pg.340]

It was proposed independently by Brown [115], and by Marshall, Williams and Turner [116], that Charpy impact tests on sharply notched specimens can be analysed quantitatively in terms of linear elastic fracture mechanics. It is assumed that the polymer deforms in a linear elastic fashion up to the point of failure, which occurs when the change in stored elastic energy due to crack growth satisfies the Irwin-Kies relationship (Equation (13.10) above). So that... [Pg.422]


See other pages where Irwin-Kies relationship is mentioned: [Pg.245]    [Pg.278]    [Pg.317]    [Pg.383]   
See also in sourсe #XX -- [ Pg.238 , Pg.245 ]

See also in sourсe #XX -- [ Pg.422 ]




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