کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
778230 1463766 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fatigue properties of a pseudoelastic NiTi alloy: Strain ratcheting and hysteresis under cyclic tensile loading
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Fatigue properties of a pseudoelastic NiTi alloy: Strain ratcheting and hysteresis under cyclic tensile loading
چکیده انگلیسی


• Strain controlled pull-pull fatigue tests have been carried out.
• Large ratcheting strains have been observed from the first mechanical cycles.
• A marked evolution of the functional properties of the alloy has been observed.
• Fatigue data were analyzed according to a modified Coffin-Manson approach.

Low cycle fatigue properties of a commercial pseudoelastic Ni-rich Nickel–Titanium alloy have been analyzed. In particular, strain controlled pull–pull fatigue tests have been carried out on dog-bone shaped specimens, obtained from commercial NiTi sheets. Large ratcheting strains have been observed from the first mechanical cycles, up to a complete stabilization of the stress–strain response of the material. These mechanisms, mainly attributed to the formation of stabilized martensite and dislocation networks, cause a marked evolution of the functional properties of the alloy in terms of pseudoelastic recovery capabilities. This evolution has been systematically analyzed by identifying some functional damage parameters, involving strain, energy, transformation stress, Young’s modulus and phase transition temperatures. Furthermore, the data on structural fatigue, i.e. cycles to failure as a function of strain amplitude, are illustrated and analyzed according to a modified Coffin–Manson approach.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 66, September 2014, Pages 78–85
نویسندگان
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