EURODYMAT 1994 - 4th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 04 (1994) C8-539-C8-545
DOI: 10.1051/jp4:1994884

Definition of lower boundary in region of strength joints at high rate of strain of metals

Yu Besshaposhnikov, V. Chernukhin, V. Kozhevnikov and V. Pai

PA "Uralkhimmash", 620010 Ekaterinburg, Russia

Résumé
On a défini expérimentalement les régions du soudage à l'aide de l'explosion pour obtenir une série de joints bimétalliques à la solidité non moindre que celle du matériau le plus faible. Pour la construction correcte des régions du soudage on a exploré l'influence des faits suivants : la dépendance de l'indice de polytropie des produits de l'explosion vis-a-vis de la vitesse de la détonation ; l'influence de la pression résiduelle des produits de la détonation ; les distortions périphériques au moment du lancement de la plaque ; l'influence de la résistance des matériaux sur la géometrie de l'impact des plaques. On a proposé des rapports mathématiques pour le calcul de la limite inférieure des régions du soudage, la pression optimum résiduelle des produits de la détonation, la dimensions de la zone des effets périphériques et de l'indice de polytropie.

Abstract
Explosive weldability windows were determined by means of experiments to obtain bimetallic joints with strength not less than that of the weaker material. To construct the weldability window correctly the influence of factors not previously taken into account has been investigated. These factors are the dependence of the polytropic exponent of the explosion products on detonation velocity, the periphery distortions under casting of the plate and the influence of material strength on the plate collision geometry. Mathematical relations to calculate the lower boundary of the weldability window, the optimum residual pressure, the dimensions of the zone of periphery effects and the polytropic exponent have been developed.

© EDP Sciences 1994

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