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Crack tip parameters and elastic-plastic fracture of metals

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Abstract

By using optical displacement-measuring techniques we obtain the crack tip fields in terms of crack tip strain, crack opening angle (COA) and crack tip opening angle (CTOA). Thin plates with different crack configurations made of six elastic-plastic materials with strain hardening exponent ranging from 3 to ∞ are studied. We find that the COA resistance curve assumes certain characteristics common to all the materials. The experimental results indicate that the critical value of COA may be used as a fracture toughness parameter for these materials.

Résumé

En utilisant une technique de mesure optique des déplacements, on obtient les champs régnant à l'estrémité d'une entaille, qui s'experiment par la déformation d'extrémité d'entaille, l'angle d'ouverture de la crique (COA et l'angle d'ouverture de la pointe de la crique (CTOA). On étudie des feuillards présentant différentes configurations de fissures et réalisés en six matériaux élasto-plastiques dont les modules d'écrouissage s'échelonnent de 3 à l'infini.

On trouve que la courbe de résistance COA suppose certaines caractéristiques communes à tous les matériaux. Les résultats expérimentaux indiquent que la valeur critique du COA peut être utilisée comme paramètre de ténacité à la rupture pour les matériaux étudiés.

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Authors and Affiliations

  1. Laboratory for Experimental Mechanics Research, Department of Mechanical Engineering, State University of New York at Stony Brook, 11794-2300, New York, USA

    B. C. Liu & F. P. Chiang

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  1. B. C. Liu
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  2. F. P. Chiang
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Liu, B.C., Chiang, F.P. Crack tip parameters and elastic-plastic fracture of metals. Int J Fract 42, 371–388 (1990). https://doi.org/10.1007/BF01185958

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  • DOI: https://doi.org/10.1007/BF01185958

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