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Back-stresses, image stresses, and work-hardening

โœ Scribed by L.M Brown


Publisher
Elsevier Science
Year
1973
Weight
780 KB
Volume
21
Category
Article
ISSN
0001-6160

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โœฆ Synopsis


BACK-STRESSES, IMAGE STRESSES, AND WORK-HARDENING* L. M. BROWN?: d comparison is made between recently published theories on the plastic behaviour of dispersionhardened alloys in which no plastic relaxation occura. It is shown thet Tanaka and Mori's '1' calculation is a rigorous lower bound for the hardening to be expected. Some new derivations are given for thr mean strains in matrix and inclusions. A general formula for the image strain is presented. The theories are compared with experiment, and it is concluded that for spherical obstacles considerable plastic relaxation occurs. CONTRAISTES REFLECHIES, COSTR.UNTES IMAGES ET ECROUISSAGE L'auteur effectue uno companriaon entre 10s theories, r&emment publi&es, du comportement plautiquc des ailiages durcis par dispersion dans lesquels aucune relaxation plaatique ne se produit. Le calcul de Tanaka et Mori"' apparait comme constituant, une borne infbrieure pour l'apperition du durcisaement. L'auteur donne quelques r&ndtat.s pour les dCform8tiOns moyennes dens 18 metrice et les inclusions. et pr6sent.e une formule generale pour la contrainte image. Aprils comparaiaon des theories et des resultsts exp&imentaux, l'auteur conclut que, pour des obstacles nphbriques, il se produit unc relaxation plastique importante. RCCKSPANNUSGES, BILDRXFTE UXD VERFESTIGUSG Kiinlich ver6ffentlichte Theorien zum plastischen Verhalten dispersionsverfeetigter Legierungen, in denen keine plaatische Relaxation stattfindet, werden verglichen. Ea wird gezeigt, de0 die Rechnungen von Tanaka und Mori"' eine strenge untere Grenze fiir die zu erwartende Verfeetigung liefem. Fiir die mittlere Abgleitung in der Matrix und in den Einschliiasen werden einige neue Ableitungen angegeben. Fiir die BildkrHfte wird eine allgemeine Formel abgeleitet . Die Theorien werden mit dem Experiment verglichen; dieter Vergleich zeigt, da0 bei kugelf6rmigen Hindernissen eine betrtihtliche plastieehe Helaxetion Rtattfindet.


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