Fracture studies of point-loaded centre-cracked plates

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Abstract
This paper describes the development of a point-loaded, centre-cracked (P.L.C.C.) plate in fracture studies. The methods used to determine a satisfactory geometry for the specimen, in terms of the stability of cracking, are discussed, and the results agreed well with those obtained experimentally. The stress intensity factor ( KI) of the plate is presented for a wide range of H/W values, using a finite-element method based on a displacement-function approach. Fracture-toughness ( Gc) tests, involving the use of a quasistatic energy concept, are conducted and used to check the accuracy of the computed KI-values. Good correlation is obtained between the stress and energy approaches.

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