Fatigue life characterization of shape memory alloys undergoing thermomechanical cyclic loading

被引：39

作者：

Bertacchini, OW ^{[1
]}

Lagoudas, DC ^{[1
]}

Patoor, E ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Aerosp Engn, College Stn, TX 77843 USA

来源：

SMART STRUCTURES AND MATERIALS 2003: ACTIVE MATERIALS: BEHAVIOR AND MECHANICS | 2003年 / 5053卷

关键词：

shape memory alloys; actuator; fatigue life; microcracks; corrosion; spallation oxidation;

D O I：

10.1117/12.508207

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents a study on the fatigue life of shape memory alloy (SMA) actuators undergoing thermally induced martensitic phase transformation under various stress levels. A microstructural study characterizing specific damage patterns is conducted. Formation of different types of microcracks has been observed, showing a superficial micro cracking, at the origin of the growth of circular cracks which are finally responsible for localizing the failure of the specimens. Interactions between the micro cracking pattern and the corrosion occurrence are also studied. A spallation oxidation occurring at the surface of the actuator, which damages its properties, is put to evidence. The failure pattern observed provides information necessary to introduce a correction to the classical Wohler curve for fatigue life of a SMA material undergoing cyclic loading.

引用

页码：612 / 624

页数：13

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