مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی فرآیند آموزش شبه الاستیک و اثر حافظه‌داری دوسویه در آلیاژ حافظه‌دار نیکل-تیتانیوم

نویسندگان
محمود براتی 1
محمود کدخدایی 2
شبنم ارباب شیرانی 3
1 دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران
2 دانشیار دانشگاه صنعتی اصفهان
3 دانشگاه مهندسی برست، فرانسه
چکیده
با ظهور آلیاژهای حافظه‌دار و به دلیل دارا بودن ویژگی‌های بسیار ارزنده مکانیکی و بیولوژیکی، این آلیاژها به طور گسترده در صنایع مختلف مورد استفاده قرار گرفتند. در بین تمام آلیاژهای حافظه‌دار، آلیاژ نیکل-تیتانیوم به دلیل خواص حرارتی و مکانیکی بسیار خوب و همچنین سازگاری بسیار مناسب با بدن انسان بیشترین کاربرد را در صنایع مختلف و به ویژه در بیومکانیک داشته و تحقیقات زیادی بر روی خواص ترمومکانیکی آن صورت گرفته است. در اکثر کاربردها، آلیاژ نیکل-تیتانیوم تحت بارگذاری ترمومکانیکی چرخه‌ای قرار می‌گیرد. مهمترین محدودیت‌های استفاده از این آلیاژ، افت خواص ماده و ناپایداری آن حین بارگذاری‌های چرخه‌ای (فرآیند آموزش) می‌باشند. در پژوهش حاضر، با استفاده از روش اندازه‌گیری همزمان مقاومت الکتریکی، فرآیند آموزش شبه الاستیک آلیاژ نیکل-تیتانیوم و همچنین اثر حافظه‌داری دوسویه به وجود آمده پس از این فرآیند مورد مطالعه قرار گرفته است. در ابتدا نحوه تغییرات کرنش باقیمانده و مقاومت الکتریکی ویژه حین فرآیند آموزش نشان داده شده و در ادامه با اندازه‌گیری مقاومت الکتریکی ویژه پس از فرآیند آموزش (حین بارگذاری‌های حرارتی خاص بدون اعمال تنش) و همچنین کرنش حافظه‌داری دوسویه به دست آمده، تاثیر مارتنزیت باقیمانده و نابجایی‌ها (کرنش پلاستیک) بر روی کرنش باقیمانده مورد بررسی قرار گرفته است. نتایج به دست آمده نشان می‌دهند که حدود 33 درصد کرنش باقیمانده به وجود آمده حین فرآیند آموزش ناشی از مارتنزیت باقیمانده و حدود 67 درصد آن به خاطر نابجایی‌ها (کرنش پلاستیک) می‌باشد.
کلیدواژه‌ها
آلیاژ حافظه‌دار
فرآیند آموزش شبه الاستیک
کرنش باقیمانده
اثر حافظه‌داری دوسویه

عنوان مقاله English

Investigation on pseudoelastic training method and the generated two-way shape memory effect in NiTi shape memory alloy

نویسندگان English

Mahmoud Barati 1
Mahmoud Kadkhodaei 2
Shabnam Arbab Chirani 3
1 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
2 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
3 Ecole Nationale d’Ingénieurs de Brest, ENIB, FRE CNRS 3744, IRDL, F-29200 Brest, France
چکیده English

With the advent of shape memory alloys (SMAs), several commercial and industrial applications were proposed due to their superior mechanical and biological properties. Among these materials, Nickel-Titanium (NiTi) alloys are widely applied and well-researched since they are characterized not only by good thermal and mechanical properties but also by excellent biocompatibility compared to other SMAs. In most of the applications, the structural components and devices made of NiTi SMAs work under cyclic thermomechanical loading and one of the major limitations facing the industrial use of this alloy is the degradation of the material when subjected to cyclic loadings (i.e., training). In this study, pseudoelastic training procedure in NiTi shape memory alloy and the resultant two-way shape memory effect are studied using in-situ electric resistivity measurement. At first, variations in the residual strain and in the electric resistivity during pseudoelastic training method are revealed. Then, by measuring the electric resistivity after training procedure (upon specified thermal cycling at stress-free condition) as well as the induced two-way shape memory strain, the effects of residual martensite and dislocation (plastic deformation) on the residual strain are investigated. The obtained results show that about 33% of the residual strain accumulated in 100 pseudoelastic cycles can be ascribed to the residual martensite and about 67% of the residual stain is attributed to the dislocations (plasticity).

کلیدواژه‌ها English

Shape Memory alloy
Pseudoelastic training method
Residual strain
Two-way shape memory effect
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مهندسی مکانیک مدرس
دوره 18، شماره 3
خرداد 1397
صفحه 86-94