TIPS AND TRICKS FOR CHARACTERIZING SHAPE MEMORY ALLOY WIRE: PART 4-THERMO-MECHANICAL COUPLING

被引：41

作者：

Churchill, C. B. ^{[1
]}

Shaw, J. A. ^{[1
]}

Iadicola, M. A. ^{[2
]}

机构：

[1] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA

[2] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

来源：

EXPERIMENTAL TECHNIQUES | 2010年 / 34卷 / 02期

基金：

美国国家科学基金会;

关键词：

TRANSFORMATION;

D O I：

10.1111/j.1747-1567.2010.00619.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Tips and tricks for characterizing shape memory alloy wire in thermo-mechanical coupling have been presented. The localized behavior of strain and temperature fields shown here is common to as-received (virgin) Nitinol wire when loaded in tension. Faster rates resulted in the nucleation of more fronts as mechanical nucleation barriers were surmounted via the non-uniform temperature fields in the specimen and the temperature dependence of the nucleation and propagation stresses. This sensitivity comes from the strong thermo-mechanical coupling inherent to the material, arising from latent heat exchanges and temperature-dependent transformation stresses. The rate at which precycling occurs and the prevailing thermal environment will influence the resulting limit cycle behavior and the wire's ultimate fatigue resistance (durability).

引用

页码：63 / 80

页数：18

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