Accession Number : ADA332658
Title : Continuum Models for Irregular Phase Boundary Motion in Shape-Memory Tensile Bars
Descriptive Note : Technical rept.
Corporate Author : CORNELL UNIV ITHACA NY DEPT OF THEORETICAL AND APPLIED MECHANICS
Personal Author(s) : Rosakis, Phoebus ; Knowles, James K.
PDF Url : ADA332658
Report Date : NOV 1997
Pagination or Media Count : 32
Abstract : We consider quasi-static displacement-control led loading through one stress cycle of a shape-memory tensile bar modeled as a one-dimensional, two-phase elastic solid. Our objective is to explore the effect on the associated hysteresis loop of various qualitatively different types of kinetic relations, bearing in mind certain features of such loops that have been observed experimentally. We show that when the model involves a kinetic relation that is 'unstable' in a definite sense, 'stick-slip' motion of the interface between phases and serration of the accompanying stress-elongation curve are both predicted at slow elongation rates. We also show that a 'nonhomogeneous' kinetic relation intended to model the effect of micro-obstacles on interface motion also leads to irregular interface motion and a serrated stress-elongation curve, in this case at all elongation rates.
Descriptors : *PHASE TRANSFORMATIONS, *HYSTERESIS, STRESSES, INTERFACES, ELASTIC PROPERTIES, MOTION, BOUNDARIES, KINETICS, LOOPS, TWO PHASE FLOW, ELONGATION, SOLID BODIES, CYCLIC LOADS.
Subject Categories : Physical Chemistry
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE