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On the dynamic fracture of structural metals

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Abstract

Some fundamental aspects of dynamic crack growth in structural steels are presented and discussed. The discussion takes the form of a direct comparison of experimental results to elastic-plastic analyses, and attempts to clarify the role of material inertia and plasticity in the dynamic crack growth process. In addition the relation of crack growth criteria to micromechanical void growth models is considered.

Potential problems in the analysis of data obtained by either direct optical measurements or numerical simulations of crack growth are presented. It is demonstrated that large errors in the velocity records caused by stress wave effects are a main source of uncertainty in the interpretation of experimental results.

Résumé

On présente et on discute certains aspects fondamentaux de la croissance dynamique d'une fissure dans des aciers de construction. La discussion prend la forme d'une comparaison directe des résultats expérimentaux à l'analyse élasto-plastique et tente de clarifier le rôle de l'inertie et de la plasticité du matériau dans le processus de croissance dynamique d'une fissure. On considère en outre la relation qui les critères de la croissance d'une fissure aux modèles micro-mécaniques de croissance des lacunes.

On présente les problèmes potentiels que peuvent surgir dans l'analyse des données obtenues par des mesures directes optiques ou par des simulations numériques de la croissance d'une fissure. On démontre que des erreurs importantes dans les enregistrements de vitesse causées par des effets d'onde de contrainte sont la source principale d'incertitudes dans l'interprétation des résultats expérimentaux.

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Authors and Affiliations

  1. Graduate Aeronautical Laboratories, California Institute of Technology, 91125, Pasadena, CA, USA

    Ares J. Rosakis & Alan T. Zehnder

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  1. Ares J. Rosakis
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  2. Alan T. Zehnder
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Rosakis, A.J., Zehnder, A.T. On the dynamic fracture of structural metals. Int J Fract 27, 169–186 (1985). https://doi.org/10.1007/BF00017966

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  • DOI: https://doi.org/10.1007/BF00017966

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