首页 | 本学科首页   官方微博 | 高级检索  
     


Tensile and fatigue behavior of superelastic shape memory rods
Affiliation:1. Materials Science and Engineering Department, University of Texas at Arlington, Arlington, TX 76019, United States;2. Civil and Environmental Engineering Department, University of Texas at Arlington, Arlington, TX 76019, United States;3. Mechanical and Aerospace Engineering Department, University of Texas at Arlington, Arlington, TX 76019, United States;4. Materials Science and Engineering Department, University of Texas at Arlington, Arlington, TX 76019, United States;1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, PR China;2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, PR China;1. MINES ParisTech, PSL — Research University, CEMEF — Centre for Material Forming, CNRS UMR 7635, CS10207 rue Claude Daunesse, 06904 Sophia Antipolis Cedex, France;2. Linde AG, Carl-von-Linde-Str. 25, 85716 Unterschleissheim, Germany;3. Lafarge Centre de Recherche, 95 rue du Montmurier, 38291 Saint Quentin Fallavier, France;1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;2. School of Chemical & Biological Engineering & Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Republic of Korea;3. Agency for Defense Development, Daejeon 305-600, Republic of Korea;4. Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;5. KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;1. Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary;2. Laboratory of High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland;3. Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne, Ecublens CH-1026, Switzerland
Abstract:The tensile and fatigue behavior of superelastic shape memory alloy (SMA) bars heat-treated at three different temperatures were examined. Low cycle fatigue tests at variable load rates were carried out to determine the effect of stress and frequency on residual strain and energy dissipation in a fatigue cycle. The mechanism of energy dissipation was studied by monitoring the temperature changes in the fatigued samples as a function of applied stress and frequency of testing. Results from the tensile tests revealed that the stress for the Austenite to Martensite transformation decreased from 408 MPa to 204 MPa with an increase in temperature of heat treatment from 300 to 450 °C. The ultimate strength of the SMA increased from 952 MPa to 1115 MPa when the heat treatment temperature was increased from 300 to 450 °C. Fatigue testing prior to conducting the tensile test decreased the ultimate strength of the SMA and also reduced the failure strain. The energy dissipation in fatigue tests was found to decrease as test frequency increased from 0.025 Hz to 0.25 Hz and the change in sample temperature during the test at the lower test frequency was found to be considerably higher than at the higher frequency.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号