Propagating pattern selection in the Portevin-Le Chatelier effect

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90105-2· OSTI ID:6007819

Jeanclaude, V; Fressengeas, C ^[1]

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1. Univ. de Metz, Ile du Saulcy (France). Lab. de Physique et Mecanique des Materiaux

There is perhaps no better example of propagative plastic instability than the Portevin-Le Chatelier (PLC) effect. The effect consists in the repeated generation and propagation of sharply edged deformation bands along a tensile specimen; the bands show up as load drops at constant applied strain-rate, or as strain bursts at constant applied stress-rate. This paper is a discussion of the various ways of incorporating gradients that have been proposed, basically the internal stress and the cross-slip models, on the basis of their macroscopic consequences. Pivotal to that analysis is the well ascertained experimental observation that, at constant stress-rate loading, the PLC band velocity shows a monotonic decrease with increasing applied stress-rates: nonlocal models will be mainly discriminated according to their ability to reproduce that trend.

• OSTI ID: 6007819
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:9; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
DEFORMATION
GRAIN ORIENTATION
INSTABILITY
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
ORIENTATION
PLASTICITY
SLIP
STRAINS
STRESSES