Mathematical Modelling

Boër, Claudio R.; Rebelo, Nuno; Rydstad, Hans A. B.; Schröder, G.

doi:10.1007/978-3-642-82788-4_2

Process Modelling of Metal Forming and Thermomechanical Treatment 1986

DOI: 10.1007/978-3-642-82788-4_2

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Mathematical Modelling

Claudio R. Boër¹,

Nuno Rebelo²,

Hans A. B. Rydstad³

et al.

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Cited by 2 publications

References 24 publications

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Selection of Can and Insulating Materials for Controlled-Dwell Extrusion of Gamma-TiAl

Bai

Liu

et al. 2005

MSF

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Finite element method (FEM) simulation is carried out to analyze temperature distribution of the workpiece for the controlled-dwell extrusion of gamma-TiAl. We focused on the selection of can and insulating materials and concluded that silica fabric is a better insulating material than ZrO2 powders. 304SS, Ti6Al4V, 1Cr18Ni9Ti and pure Ti can be selected as can material if the dwell time and in-container time are well controlled. Thermo-mechanical coupled analysis is performed to investigate flow uniformity and temperature homogeneity for different can and insulating materials. Extrusion experiment was conducted and the results basically agree well with those of the simulation.

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Selection of Can and Insulating Materials for Controlled-Dwell Extrusion of Gamma-TiAl

Bai

Liu

et al. 2005

MSF

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Numerical Analysis of Triaxial Residual Stresses in Quenched 316H Stainless Steel

Campos

Teixeira-Dias

2007

MSF

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Residual stress fields can cause creep damage in thermally aged components, even in the absence of working loads. In order to study this issue, the authors present a numerical study on the development of triaxial residual stresses in stainless steel specimens. A mechanical model dedicated to the analysis of heat treatment problems is described. The presented formulations are implemented incrementally with a non-linear constitutive model, adequate to the simulation of a wide range of thermal processes. The flow rule is a function of the equivalent stress and the deviatoric stress tensor, of the temperature field and of a set of internal state variables. The thermomechanical coupled problem is solved with a staggered approach. Spray water quenching was used to generate residual stress fields in solid cylinders and spheres made from 316H stainless steel. Finite element simulations were performed to find out how process conditions and specimen geometry influence the resulting residual stress distributions. The results show that compressive residual stresses are developed near the surfaces of the cylinders and spheres while tensile residual stresses occur near the centre. The level of residual stresses was found to be dependent on the heat transfer coefficient.

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Mathematical Modelling

Cited by 2 publications

References 24 publications

Selection of Can and Insulating Materials for Controlled-Dwell Extrusion of Gamma-TiAl

Selection of Can and Insulating Materials for Controlled-Dwell Extrusion of Gamma-TiAl

Numerical Analysis of Triaxial Residual Stresses in Quenched 316H Stainless Steel

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