Thermomechanical transformation fatigue of TiNiCu SMA actuators under a corrosive environment - Part I: Experimental results

被引:49
作者
Bertacchini, Olivier W. [1 ]
Lagoudas, Dimitris C. [1 ]
Patoor, Etienne [2 ]
机构
[1] Texas A&M Univ, Dept Aerosp Engn, TiiMS, College Stn, TX 77843 USA
[2] ENSAM Metz, CNRS, Mecan & Phys Mat Lab, UMR 7554, F-57078 Metz, France
关键词
Shape memory alloy; Actuator; Thermomechanical cyclic loading; Transformation fatigue; Corrosion; Shear-lag modeling; S-N curves; SHAPE-MEMORY ALLOY; PLASTIC STRAINS; WIRES; NI; BEHAVIOR; LIFE; NITINOL; SURFACE;
D O I
10.1016/j.ijfatigue.2009.04.012
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a corrosive environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a corrosive environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part 11 of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a corrosive environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1571 / 1578
页数:8
相关论文
共 26 条
  • [1] Bannantine J.A., 1990, Fundamentals of Metal Fatigue Analysis
  • [2] Fatigue life characterization of shape memory alloys undergoing thermomechanical cyclic loading
    Bertacchini, OW
    Lagoudas, DC
    Patoor, E
    [J]. SMART STRUCTURES AND MATERIALS 2003: ACTIVE MATERIALS: BEHAVIOR AND MECHANICS, 2003, 5053 : 612 - 624
  • [3] Bhaumik S. K., 2008, Key Engineering Materials, V378-379, P301
  • [4] Thermomechanical study of the stress assisted two way memory effect fatigue in TiNi and CuZnAl wires
    Bigeon, MJ
    Morin, M
    [J]. SCRIPTA MATERIALIA, 1996, 35 (12) : 1373 - 1378
  • [5] Birman V., 1997, Appl. Mech. Rev, V50, P629, DOI DOI 10.1115/1.3101674
  • [6] Thermomechanical modeling of polycrystalline SMAs under cyclic loading, Part III: evolution of plastic strains and two-way shape memory effect
    Bo, ZH
    Lagoudas, DC
    [J]. INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE, 1999, 37 (09) : 1175 - 1203
  • [7] Calkins F.T., 2006, P SPIE, V6171
  • [8] CALKINS FT, 2004, 42 AIAA AER SCI M EX
  • [9] Study of the stress-assisted two-way memory effect of a Ti-Ni-Cu alloy using resistivity and thermoelectric power techniques
    Cuéllar, EL
    Guénin, G
    Morin, M
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2003, 358 (1-2): : 350 - 355
  • [10] Fatigue behavior of Ti-Ni-Cu thin wires SME
    de Araujo, CJ
    Morin, M
    Guenin, G
    [J]. JOURNAL DE PHYSIQUE IV, 1997, 7 (C5): : 501 - 506