PLASTIC HINGE MODEL: A GENERALIZATION TO A TWO-DIMENSIONAL SITUATION

— Several experimental techniques used in fracture toughness tests are based on the “Plastic hinge” model that permits different fracture mechanics parameters to be determined. This model is only valid under the following conditions: small displacements, small stable crack growth, and small distance...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 1994-10, Vol.17 (10), p.1147-1156
Main Authors: Manzione, P. N., Perez-Ipiña, J. E.
Format: Article
Language:English
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Summary:— Several experimental techniques used in fracture toughness tests are based on the “Plastic hinge” model that permits different fracture mechanics parameters to be determined. This model is only valid under the following conditions: small displacements, small stable crack growth, and small distances between knife edges and the apparent centre of rotation. A generalized model for a two‐dimensional situation is presented which permits a better representation of the phenomena that occur in a test involving crack growth and large displacements. The use of a two‐dimensional factor, that corrects the measured displacements by converting them into ones that would be measured under a one‐dimensional hypothesis, is proposed. In this way the same methodology used for CTOD determination, may again be used.
ISSN:8756-758X
1460-2695
DOI:10.1111/j.1460-2695.1994.tb01404.x