Advanced Search

Journal Navigation

Journal Home

Subscriptions

Archive

Contact Us

Table of Contents

SAGETRACK

Sign In to gain access to subscriptions and/or personal tools.
Journal of Intelligent Material Systems and Structures
This Article
Right arrow Full Text (OnlineFirst PDF)
Right arrow All Versions of this Article:
1045389X06073426v1
19/1/47    most recent
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to Saved Citations
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Request Reprints
Right arrow Add to My Marked Citations
Citing Articles
Right arrow Citing Articles via Google Scholar
Right arrow Citing Articles via Scopus
Google Scholar
Right arrow Articles by Auricchio, F.
Right arrow Articles by Desroches, R.
Right arrow Search for Related Content
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Article

Rate-dependent Thermo-mechanical Modelling of Superelastic Shape-memory Alloys for Seismic Applications

Ferdinando Auricchio1, Davide Fugazza2*, Reginald Desroches3

1 Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia Via Ferrata 1, 27100 Pavia, Italy; I stituto di Matematica Applicata e Tecnologie Informatiche, Università degli Studi di Pavia Via Ferrata 1, 27100 Pavia, Italy; European School for Advanced Studies in Reduction of Seismic Risk (ROSE School) Via Ferrata 1, 27100 Pavia, Italy
2 Dipartimento di Meccanica Strutturale, Università degli Studi di Pavia Via Ferrata 1, 27100 Pavia, Italy; European School for Advanced Studies in Reduction of Seismic Risk (ROSE School) Via Ferrata 1, 27100 Pavia, Italy
3 School of Civil and Environmental Engineering, Georgia Institute of Technology 790 Atlantic Drive, Atlanta, GA 30332-0355, USA

* To whom correspondence should be addressed.


  Abstract

Experimental tests performed on superelastic shape-memory alloys (SMAs) show a significant dependence of the stress-strain relationship on the loading-unloading rate, coupled with a not negligible oscillation of the material temperature. This feature is of particular importance in view of the use of such materials in earthquake engineering, where the loading rate affects the structural response. Motivated by this observation and by the limited number of available works on the modelling of SMAs for seismic applications, the present article addresses a uniaxial constitutive model for representing the system rate-dependent thermo-mechanical behavior of superelastic SMAs. The model is based on a single internal scalar variable, the martensite fraction, for which different rate-independent evolutionary equations in rate form are proposed. Moreover, it takes into account the different elastic properties between austenite and martensite. The whole model is then thermo-mechanically coupled with a thermal balance equation. Hence, it considers mechanical dissipation as well as latent heat and includes temperature as a primary independent variable, which is responsible for the dynamic effects. The article also provides a description for the integration, in time, of the constitutive equation and presents the solution algorithm of the corresponding time-discrete problem. Finally, results from numerical analyses are reported and the ability of the model to simulate experimental data obtained from uniaxial tests performed on superelastic SMA wires and bars at frequency levels of excitation typical of earthquake engineering is assessed.

Key Words: shape-memory alloys, constitutive modelling, experimental tests, seismic applications

First published on March 29, 2007, doi:10.1177/1045389X06073426

Journal of Intelligent Material Systems and Structures 2008;19:47.

A more recent version of this article appeared on January 1, 2008

Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?