Effect of mechanical cycling on the stress-strain response of a martensitic Nitinol shape memory alloy

被引：35

作者：

Nayan, Niraj ^{[1
]}

Buravalla, V. ^{[2
]}

Ramamurty, U. ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India

[2] ITPB, India Sci Lab, Gen Motors R&D, Bangalore 560066, Karnataka, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 525卷 / 1-2期

关键词：

Shape memory alloy; Martensite; Fatigue; Austenite; Strain accumulation; FATIGUE-LIFE; BEHAVIOR; SMA; TRANSFORMATION; NI; STABILIZATION;

D O I：

10.1016/j.msea.2009.07.038

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

An experimental investigation into the ambient temperature, load-controlled tension-tension fatigue behavior of a martensitic Nitinol shape memory alloy (SMA) was conducted. Fatigue life for several stress levels spanning the critical stress for detwinning was determined and compared with that obtained on an alloy similar in composition but in the austenitic state at room temperature. Results show that the fatigue life of the pseudo-plastic alloy is superior to superelastic shape memory alloy. The stress-strain hysteretic response, monitored throughout the fatigue loading, reveals progressive strain accumulation with the cyclic loading. In addition, the area of hysteresis and recoverable and frictional energies were found to decrease with increasing number of fatigue cycles. Post-mortem characterization of the fatigued specimens through calorimetry and fractography was conducted in order to get further insight into the fatigue micromechanisms. These results are discussed in terms of reversible and irreversible microstructural changes that take place during cyclic loading. Aspects associated with self-heating of martensitic alloy undergoing high frequency stress cycling are discussed. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：60 / 67

页数：8

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