8592

7973

كارشناسي ارشد

مكانيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1392

هجده،112ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمدرضا فروزان

محمد مشايخي

12/12/92

محمود كدخدايي، محسن اصفهانيان

مهندسي مكانيك

ID7973

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Estimation of the mould thermal fatigue life in horizontal centrifugal casting of cast iron pipes Masoud Shirani masoud shirani@me iut ac ir Date of Submission Department of Mechanical Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor Dr Mohammad Reza Forouzan forouzan@cc iut ac ir Abstract Continued developments in the casting techniques in the first half of the th caused the invention of horizontal centrifugal casting method to produce pipes which is gradually replaced instead of sand casting method Ductile iron pipes which were casted were being used as the standard pipes in modern drinking water and wastewater networks for years The main goal of this dissertation is thermal and mechanical simulation of horizontal centrifugal casting to produce ductile iron pipe by using finite element method and finally thermal fatigue life estimation molds use in casting machines The process is simulated in ANSYS commercial software developing related ANSYS codes macros In this research a numerical axisymmetric model of the pipe and mold is proposed and history of the thermal distribution in cast and mold during solidification and thermal cycle of casting is obtained In the simulation initial and boundary conditions proportional to practical conditions and thermophysical properties of material which are function of temperature are also considered The comparison to results of the thermal simulation show good agreement with the experimental results conducted in this study and numerical results by the numerical results found in the literature Then the mold temperature distribution used as input data for the mechanical analysis and with regard to the mechanical properties of the mold which are function of temperature and the mechanical constraints imposed the stress and strain generated in the cycles may be obtained Results of the mechanical simulation show good agreement with the experimental results conducted in this study and numerical results by the numerical results found in the literature Finally estimated mold life with putting sustainable cycle of stress and strain values in formulas such as Morrow or Manson Halfrd and are compared with experimental results The results of simulation have shown that the maximum temperature on the mold critical point have a significant effect on the increase or decrease in the mold life Key Words Horizontal centrifugal casting Heat transfer Mechanical simulation Thermal fatigue life FE Analysis

محمدرضا فروزان

محمد مشايخي

محمود كدخدايي، محسن اصفهانيان