İnce kesitli döküm boşluğunu doldurmakta olan ergimiş malzemeye ait hareketin sonlu elemanlar yöntemi ile incelenmesi
An Investigation of the flow of molten material filling thin section casting by using finite element method
- Tez No: 83699
- Danışmanlar: YRD. DOÇ. DR. MEHMET İREN
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1999
- Dil: Türkçe
- Üniversite: Balıkesir Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Makine Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 225
Özet
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Özet (Çeviri)
.-«i*" ABSTRACT r.V* \'J%/..?...../ AN INVESTIGATION OF THE FLOW OF MOLTEN MATERIAL FİLLİnG THIN SECTION CASTING CAVITY BY USING FINITE ELEMENT METHOD Gülsen YAMAN Balıkesir University, Institute of Science, Department of Mechanical Engineering Ph.D. Thesis/Supervisor : Asst.Prof.Dr. Mehmet İREN Bahkesir-Turkey 1999 Mathematical models for material processing and mould filling have been considered in the last thirty years. Mathematical modelling of mould filling and its simulation has been studied by academics and industry because of its benefits on cost savings. In this study, the development of a mathematical modelling for filling thin section cavities and finite element analysis is used to simulate some filling examples as case studies. Furthermore, obtained results are compared with the results of ANSYS analysis package. With the approach that the transverse velocity profile across a thin section is between parabolic and plain distributions, the flow throughout the cavity defined by in-plain velocity components is simulated using a two and a half (quasi three) dimensional formulation. By applying an appropriate velocity profile and accounting for thickness variation, the thickness-integrated continuity Navier-Stokes and pseudo- concentration equations was derived from the governing filling formulation which is based on conservation laws of mass, momentum, and free surface. IVJSS>.-»İESB The finite element flow formulation was constructed by discretising mh gowrniriff- \ - 'j _ equations spatially and temporally using the conventional Galerkin mffhoil and the implicit backward difference method, respectively, and was solved by^mlj&d formulation. The explicit Taylor-Galerkin method was used to discretise the pseudo- concentration equation for free surface tracking. For some selected examples that have simple geometry analytical solution applied results are compared with numerical results. These analytical and numerical results are compared with the results generated by ANSYS (FLOTRAN module) analysis package. This filling simulation model was applied to a case study that the numerical results have been compared with the experimental data for the benchmark gravity sand casting as gathered by other researchers. KEY WORDS: Thin Section Casting / finite element analysis / Navier-Stokes equations / thickness integrated formulation / 2\ (quasi-three) dimensional analysis / ANSYS
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