پديد آورنده :
حسامي، مائده
عنوان :
تحليل خستگي خمشي چرخشي آلياژهاي حافظه دار
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مكانيك
صفحه شمار :
چهارده، 88ص.: مصور
استاد راهنما :
محمود كدخدايي
استاد مشاور :
شبنم ارباب شيراني
توصيفگر ها :
معادلات ساختاري يك بعدي , شبيه سازي عددي , رابطه ي زاويه - خميدگي و انحنا
تاريخ نمايه سازي :
94/11/18
استاد داور :
محمدرضا فروزان، صالح اكبرزاده
چكيده انگليسي :
Rotary Bending Fatigue Analysis of Shape Memory Alloys Maede Hessami m hessami@me iut ac ir January 11 2016 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDgree M ScLanguage PersionSupervisor M Kadkhodaei Assoc Prof kadkhodaei@cc iut ac irAbstractRotary bending is a kind of cyclic loading in which a straight beam is bent into a curvedshape and is forced to rotate around its longitudinal axis Thus each point of the samplesection is subjected to repeated tension compression cycles until fracture occurs as aresult of fatigue failure Rotary bending fatigue RBF behavior of shape memory alloys SMAs is a fascinating research field especially in endodontic rotary files In the present work one dimensional constitutive model is used to study RBF behavior ofSMA beams The stress and strain distributions in a beam section are driven numericallyfor both pure bending and rotary bending to show the basic differences between the twoloading fashions In order to verify the numerical results tests were performed on NiTi specimens with animposed bending angle using a bending apparatus Since the specimens show significantstress plateau for forward and backward transformation in their stress strain response anenhanced stress temperature phase diagram is proposed in which different slopes areconsidered for the start and finish of each transformation strip In order to study low cycle fatigue of SMAs during rotary bending the stabilizeddissipated energy is calculated from numerical solution A power law for variations of thefatigue life with the stabilized dissipated energy is obtained for the studied specimens topredict their fatigue life The numerical predictions of the present approach are shown tobe in a good agreement with the experimental findings for rotary bending fatigue Keywords Rotary bending Fatigue Shape memory alloy Stabilized dissipated energy Modified phase diagram
استاد راهنما :
محمود كدخدايي
استاد مشاور :
شبنم ارباب شيراني
استاد داور :
محمدرضا فروزان، صالح اكبرزاده
