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LOAD-INDUCED MARTENSITIC TRANSFORMATIONS IN PSEUDO-ELASTIC LENNARD-JONES CRYSTALS

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Original languageEnglish
Title of host publicationSMASIS2008: PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE STRUCTURES AND INTELLIGENT SYSTEMS - 2008, VOL 1
Place of PublicationNEW YORK
PublisherAmerican Society for Mechanical Engineers
Pages307-314
Number of pages8
ISBN (Print)978-0-7918-4331-4
StatePublished - 2009
EventConference on Smart Materials, Adaptive Structures and Intelligent Systems - Ellicott City
Duration: 28 Oct 200830 Oct 2008

Conference

ConferenceConference on Smart Materials, Adaptive Structures and Intelligent Systems
CityEllicott City
Period28/10/0830/10/08

Abstract

We present molecular dynamics (MD) simulations of a load-induced martensitic phase transformation in pseudo-elastic Lennard-Jones crystals. The model material exhibits martensitic transformations between cubic and hexagonal lattice structures in 2D which represent austenite and martensite. Under axial loading two martensite variants are favoured out of four generic variants possible with this model. In nucleation-and-growth processes the formation of martensite domains are observed in MD simulations and the reverse process upon unloading. Two possible re-transformation mechanisms are identified, a reversible and a reconstructive type. Reversible re-transformations conserve the reference unit cells, while the reconstructive mechanism involves the generation of dislocation motions which destroy the reference unit cells by slip. Both types re-establish the square lattice. While the reversible type represents the predominant reverse transformation mechanism, the reconstructive type is of special importance because it produces lattice defects, and plastic deformation which change both the evolution of subsequent transformation cycles and the magnitude of the phase transformation load.

    Research areas

  • MOLECULAR-DYNAMICS, 2D MODEL, SIMULATION

Event

Conference on Smart Materials, Adaptive Structures and Intelligent Systems

28/10/0830/10/08

Ellicott City

Event: Conference

ID: 1277556