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Yielding ahead of a pile-up subject to a non-uniform shear stress

✍ Scribed by E Smith


Publisher
Elsevier Science
Year
1967
Weight
397 KB
Volume
15
Category
Article
ISSN
0001-6160

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✦ Synopsis


A criterion is derived for yielding ahead of a dislocation pile-up subject to a non-uniform shear stress. The theory is applied to the problem of twin initiation by slip bands in the vicinity of a crack tip, the predictions being related to experimental results and the fracture mechanics approach to crack extension.

DEFORMATION

PLASTIQUE EN TETE D'UN EMPILEMENT SOUMIS A UKE CONTRAINTE DE CISAILLEMENT NON UNIFORME On determine un critere de la deformation plastique en t&e d'un empilement de dislocations soumis B une contrainte de cisaillement non uniforme. On applique la thborie au probleme de la g&&ration de macles par les bandes de glissement au voisinage de l'extr&mit8 d'une fissure, les p&visions &ant relibes aux resultats exp&imentaux et la mbcanique de la rupture rapprochee de l'extension de la fissure. FLIESSEN VOR EINER AUFSTAUUNG BE1 UNEINHEITLICHER SCHERSPANNUNG Es wird ein Kriterium fiir das Fliessen vor einer Ausstauung von Versetzungen bei uneinheitlicher Scherspannung hergeleitet. Die Theor ie wird aufdaa Problem der Zwillingseinleitung durch Gleitbiinder in der N&he einer Risspitze angewandt. Die Ergebnisse werden mit experimentellen Resultaten in Zusammenhang gebracht. Der Bruchmechanismus niihert sich der Rissausbreitung.


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