AN IMPROVED THERMAL-STRUCTURAL FINITE ELEMENT MODEL FOR MANUFACTURING PROCESSES WITH HEAT GENERATION

Abstract eng:
In this paper a universal mathematical model capable of predicting thermo-mechanical behaviour of various types of metal during their manufacturing using fully coupled thermal-structural finite element analysis is presented. The model takes into account the internal damping of the material, elastic and plastic heating and it can be used in wide range of strain rates that accompany the deformation of the body. In the model finite element implementation an improved heat equation, the updated Lagrangian formulation, the NoIHKH material model and the Jaumann rate in the form of the Green-Naghdi rate in the co-rotational Cauchy’s stress tensor integration have been used. Cyclic tension of a notched aluminium specimen has been studied using prescribed axial deformation and a sine function with linearly increasing amplitude and 2 Hz frequency in the run-up stage of the test and a sine function with constant amplitude and linearly increasing frequency in the operation stage of the test. A few selected analysis results are presented and briefly discussed. The analysis results are very positive and the authors believe that the model might open new perspectives in the study and numerical simulations of metals.

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