Premium
Erholungsspannung in Drähten aus Formgedächtnislegierung für Anwendung im Bauingenieurwesen: Experimentelle Analyse und thermomechanische Modellierung
Author(s) -
Tran H.,
Balandraud X.,
Destrebecq J.F.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100805
Subject(s) - materials science , shape memory alloy , martensite , sma* , nickel titanium , austenite , thermomechanical analysis , thermal , composite material , thermal expansion , stress (linguistics) , structural engineering , phase (matter) , metallurgy , engineering , thermodynamics , microstructure , computer science , linguistics , physics , philosophy , chemistry , organic chemistry , algorithm
The present study deals with the creation of so‐called “recovery stresses” in SMA wires. Two approaches are developed. First, experiments are performed on nickel‐titanium wires with suitable transformation temperatures. The wires are stretched in the martensite state at ambient temperature. A thermal cycle at constant strain is applied to transform the martensite to austenite, in order to activate the shape memory effect. During the thermal loading, both the phase transformation and the thermal expansion lead to stresses in the wires. Second, a thermomechanical model is used to analyze the experimental results. The model accounts for the phase transformations caused by combinations of stress and temperature loadings. The results are then discussed in the framework of application to concrete component reinforcement.