Flow stress models for deformation under varying condition—finite element method simulation
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This work presents description and comparison of internal and state variable models of flow stress in varying processing conditions. Three models were analyzed. The first one is based on dislocation theory and describing the mechanical behavior of f.c.c. polycrystalline structures. The second and third models are standard and modified Sellars’ flow stress models. Models were adapted for two commercial codes based on finite element method: QForm7 and Forge 2005. The compression test of 45 grade steel with instant changes of strain rate was simulated. Calculated compression force and flow stress were compared with the experimental data from plastometric tests. The forging process was simulated by QForm7. Results obtained by both internal and modified Sellars’ models confirm their high accuracy for analysis and prediction of the flow stress under the varying deformation conditions.
KeywordsFlow stress Internal variables model Varying deformation conditions FEM simulation
- 2.Roberts W (1984) Dynamic changes that occur during hot working and their significance regarding microstructural development and hot workability. In: Krauss G (ed) Deformation, processing and structure, ASM, Metals Park OH, pp 109–184Google Scholar
- 4.Bergström Y (1969/70) Dislocation model for the stress-strain behaviour of polycrystalline α-Fe with special emphasis on the variation of the densities of mobile and immobile dislocations. Mater Sci Eng 5:193–200Google Scholar
- 12.Ordon J, Kuziak R, Pietrzyk M (2000) History dependent constitutive law for austenitic stainless steels. In: Pietrzyk M, Kusiak J, Majta J, Hartley P, Pillinger I (eds.) Proceedings of metal forming 2000, Krakow, pp 747–753Google Scholar
- 24.Sellars CM, Tegart WJ, Mc G (1966) La relation entre la resistance et la structure dans la deformation a chaud. Mem Sci Rev Metall 63:731–746Google Scholar
- 25.Malinowski Z (2001) Analysis of temperature fields in the tools during forging of axially symmetrical parts. Arch Metall 46:93–118Google Scholar
- 28.Shida S (1968) Effect of carbon content, temperature and strain rate on compressive flow-stress of carbon steel (Resistance to deformation of carbon steels at elevated temperature, 1st report). J JSTP 9:127–132Google Scholar
- 30.Stebunov S, Biba N, Ovchinnikov A, Smelev V (2007) Application of QForm forging simulation system for prediction of microstructure of aluminium forged parts. Comp Meth Mater Sci 7:1–5Google Scholar
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