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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Thermo-viscoelastic-plastic deformation of huge products in thermal process

Cho C., Kwahk S.-Y., Kim W.-J., Choi J.-K.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 17, nr 1-2

233--236

Purpose: This paper is to numerically predict thermo-elastic-plastic deformation during thermal process. Decreasing material strength in thermal processes causes severer deformation at elevated temperature even under self-weight of huge and heavy products. Design/methodology/approach: A hybrid method is proposed and applied, in this study, to analyse thermomechanically coupled problems such as heat treatment. The finite difference method (FDM) and the finite element method (FEM) are prefered. In general, FDM is favored for heat/fluid flow, FEM for structure analysis. Findings: The solution of heat treatment processing is conducted by using the proposed hybrid method that we developed the numerical program for calculating the deflection induced due to its own weight and the creep. The code is verified by the analytic solution of a simple plate model. Research limitations/implications: There have been developed peculiar computational methods fitted in each single field problem. Recent problems necessitate total solutions not only in a major relating science but also in adjacent engineering parts. To keep the efficiency of respective methods even in coupled field problems, it is very desirable to combine advantages of respective methods as hybrid technique. This study suggests and applies a hybrid method of FEM and FDM for simulating heat treatments. Further improvement to convert different types of computational models to each other is one of important issues. Practical implications: In the past half century, there have been developed numerous computational techniques in various fields in separate ways. Hybrid method of combining existing computational techniques rather than further extending the techniques may have significant implication whenever practical problems necessitate total solutions coupled over multiple physics. Originality/value: The concept of a hybrid technique between FEM and FDM was implemented in this study and applied to simulate a heat treatment case as a multiphysical problem.