~6 s u m 6 : L'article d6crit le mesurage de I? rgsistance dans les conditions de fracture dynamique d'un acier minier. Les conditions de temperature, du taux de te,nsion et de la constrainte sur le choix $u mat6riel6taient vari6es. On s'e?t,serui des modgles theore2ques qui existent d6jzpour faire l'etude des relations entre les proprietes micro-structurales materielles et les valeurs m e s d e s de la re'sistance.
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