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An experimental investigation of the effect of specimen type on the crack tip opening displacement and J-integral fracture criteria

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Abstract

The effects of specimen type (precracked tension or bend) on the relationship between the J-integral and the crack tip opening displacement (COD) and on crack initiation values of J and COD were investigated. The material used was a mild steel. COD was measured by infiltrating the crack with a catalytically hardening silicone rubber. The J-integral was measured both by the compliance technique and using analytical formulae. No significant effect of specimen type was noted. Measurements of J from the analytical formulae used agreed well with compliance measurements. Simultaneous J and COD values were also measured on a low alloy steel. The results indicate that the J/G/COD relationships are material dependent, possibly being controlled by the material's work-hardening rate.

Résumé

On a étudié, sur un acier doux, les effets du type d'éprouvette—préfissurée pour essai de traction ou de flexion—sur la relation entre l'intégrale J et le COD, ainsi que sur les valeurs critiques à l'amorçage de J et de COD. On a mesuré le COD en injectant dans la fissure un caoutchouc de silicone à durcissement catalytique. L'intégrale J a été mesurée, de son côté, à la fois par une technique de compliance et par des formules analytiques. On n'a pas noté une influence significative du type d'éprouvette. Les mesures de J émanant des formules analytiques sont en bon accord avec les mesures par compliance. Des mesures simultanées de J et du COD ont également été effectuées sur un acier faiblement allié. Les résultats montrent que les relations entre J, G et le COD dépendent du matériau et qu'elles sont probablement régies per leur module d'écrouissage.

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Author notes

  1. J. N. Robinson

    Present address: Nuclear Installations Inspectorate, Thames House North, Millbank, SW1, London, England

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  1. Department of Metallurgy and Materials Science, Imperial College, SW7 2 BP, London, England

    J. N. Robinson

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  1. J. N. Robinson
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Robinson, J.N. An experimental investigation of the effect of specimen type on the crack tip opening displacement and J-integral fracture criteria. Int J Fract 12, 723–737 (1976). https://doi.org/10.1007/BF00037918

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  • DOI: https://doi.org/10.1007/BF00037918

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