Titlebook: Mechanics of Sheet Metal Forming; Material Behavior an Donald P. Koistinen,Neng-Ming Wang Book 1978 Plenum Press, New York 1978 computer.de

expository

Sheet Necking-II. Time-Independent Behaviord both the flow theory of plasticity as well as a finite-strain version of deformation theory are considered. A localization-band bifurcation analysis is first carried out. The influence of geometric imperfections is then analyzed using the long-wavelength approximation treated in Part I. We also di

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憤憤不平

協(xié)定

胡言亂語(yǔ)

Limits to Ductility Set by Plastic Flow Localizationnal shear band localizations that sometimes mark the onset of ductile rupture. Both bifurcation behavior and the growth of initial imperfections are considered. In addition to analyses based on classical Mises-like constitutive laws, we discuss approaches to localization based on constitutive models

alleviate

Sheet Necking-III. Strain-Rate Effectstheory and deformation theory are employed in an analysis of the growth of long-wavelength nonuniformities. Material strain-rate sensitivity is seen to substantially increase the predicted limit strains beyond their corresponding values for time-independent material response. We also discuss the inf

condescend

Plastic Flow Properties in Relation to Localized Necking in Sheetspendence on the imposed stress-state. Marciniak’s model of imperfection growth has successfully explained the rise in forming limit as the imposed strain-ratio (ε./ε.) is increased from zero (plane strain) toward unity (balanced biaxial tension). Experimental studies on formability of various materi

鎮(zhèn)壓

Deformation Analysis of Large Sized Panels in the Press Shoples of applying these results to analysis of actual press forming operations. The forming limit is defined as the amount of strain at which a pronounced roughening in surface finish occurs. This roughening signals the onset of necking as determined by means of stylus instrument measurement and visua

Stress-Fracture

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