پديد آورنده :
اصغري ورزنه، سعيد
عنوان :
مدل سازي شكست در پوشش هاي محافظ حرارتي
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
شانزده،136ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمود سليمي، مهدي صالحي
استاد مشاور :
محمدرضا فروزان
توصيفگر ها :
مكانيك شكست , پاشش حرارتي , تف جوشي , ترك , سراميك
تاريخ نمايه سازي :
27/9/89
استاد داور :
امير رضا شاهاني، حسين ادريس، مهران مرادي
كد ايرانداك :
ID342 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Fracture Modeling of Thermal Barrier Coatings Saeed Asghari Varzaneh asgharee@yahoo com November 14 2010 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran 1st Supervisor Mahmoud Salimi 1 salimi@cc iut ac ir 2nd Supervisor Mehdi Salehi 2 isrec@cc iut ac ir Advisor Mohammad Reza Forouzan 3 forouzan@cc iut ac ir Department Graduate Program Coordinator Mehdi Keshmiri Department of Mechanical Engineering Isfahan University of Technology Department of Materials Engineering Isfahan University of Technology Abstract Thermal Barrier Coatings TBCs are widely applied to internally cooled gas turbine component parts to lower the base metal temperatures Such coatings eventually fail due to thermal cycling and are generally subjected to large cyclic stresses In this research fracture failure of TBC under thermal cycling is investigated According to microstructural attributes of as sprayed as well as sintered plasma sprayed ceramic coatings a model is proposed to simulate the nonlinear stress strain behavior of plasma sprayed ceramic coatings under compression and changes of the stress strain behavior due to sintering at high temperature The results of the parametric analyses indicate that the major part of changes of the stress strain behavior in the sintering process is due to surface diffusion which lowers the density of the microcracks A numerical model is also proposed to investigate the performance of the TBC under thermal cycling The simulation results explain the experimentally observed cracking patterns The growth of oxide layer and the sintering of the top coat layer are realized to be the main sources of fracture in TBCs Finally the crack behavior in the top coat layer is investigated by using the Modified Crack Closure Integral MCCI technique Keywords Thermal Barrier Coating TBC Sintering Modified Crack Closure Integral MCCI Fracture Plasma Spray 1 Professor 2 Professor 3 Assistant Professor 1
استاد راهنما :
محمود سليمي، مهدي صالحي
استاد مشاور :
محمدرضا فروزان
استاد داور :
امير رضا شاهاني، حسين ادريس، مهران مرادي
