Partner: David Gethin

University of Wales Swansea (UK)

Recent publications
1.Postek E.W., Lewis R.W., Gethin D.T., Finite element modelling of the squeeze casting process, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT AND FLUID FLOW, ISSN: 0961-5539, DOI: 10.1108/09615530810853619, Vol.18, pp.325-355, 2008
Keywords:

Finite element analysis, Thermodynamics, Material‐deforming processes

Affiliations:
Postek E.W.-other affiliation
Lewis R.W.-University of Wales (GB)
Gethin D.T.-University of Wales Swansea (UK)
2.Lewis R.W., Postek E.W., Han Z., Gethin D.T., A finite element model of the squeeze casting process, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT AND FLUID FLOW, ISSN: 0961-5539, Vol.16, No.5, pp.539-572, 2006
3.Postek E.W., Lewis R.W., Gethin D.T., Ransing R.S., Influence of initial stresses on the cast behaviour during squeeze forming processes, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ISSN: 0924-0136, DOI: 10.1016/j.jmatprotec.2004.05.022, Vol.159, No.3, pp.338-346, 2005
Abstract:

This paper deals with the evaluation of the effects of initial stresses developed during the pressurized casting process. The stresses are induced by the external pressure applied to the cast and developed due to thermal loading. The effect of the stresses is considered as a second order effect by means of investigating the influence of the ‘geometric’ or ‘initial stresses’ stiffness matrix on the response of the cast. The problem formulation is done in the updated Lagrangian (UL) frame. An implicit time integration scheme is applied to solve the transient thermomechanical problem in a staggered form. The constitutive mechanical model is elasto-viscoplastic with hardening incorporated with a Mises yield function. The finite element method is employed and a few 3D numerical examples are presented.

Keywords:

Squeeze casting, Initial stresses, Coupled problems, Finite elements

Affiliations:
Postek E.W.-other affiliation
Lewis R.W.-University of Wales (GB)
Gethin D.T.-University of Wales Swansea (UK)
Ransing R.S.-other affiliation

Conference papers
1.Lewis R.W., Postek E.W., Gethin D.T., Yang X.S., Pao W.K.S., Chao L., Numerical methods in simulation of industrial processes , AET2006, First International Conference on Advances in Engineering and Technology, 2006-07-16/07-19, Entebbe (UG), No. , pp.764-795, 2006
Abstract:

The paper deals with an overview of some industrial applications leading to a formulation for advanced numerical techniques. The applications comprise squeeze casting processes, forming of tablets and petroleum reservoir modelling. All of the problems lead to solutions of highly nonlinear, coupled sets of multiphysics equations.

Keywords:

squeeze forming, powder compaction, oil fields, coupled problems, thermomechanics, porous media, fluid flow, nonlinear solid mechanics, phase transformations, microstructural solidification models, numerical methods, contact problems, discrete elements, finite elements.

Affiliations:
Lewis R.W.-University of Wales Swansea (UK)
Postek E.W.-IPPT PAN
Gethin D.T.-University of Wales Swansea (UK)
Yang X.S.-University of Wales Swansea (UK)
Pao W.K.S.-University of Wales Swansea (UK)
Chao L.-University of Wales Swansea (UK)
2.Ahmad R., Gethin D.T., Lewis R.W., Ransing R.S., Postek E.W., Thermal optimisation of the squeeze-forming process using genetic algorithms, 3rd M.I.T Conference on Computational Fluid and Solid Mechanics, 2005-06-14/06-17, Boston (US), pp.1205-1208, 2005
3.Lewis R.W., Postek E.W., Gethin D.T., Ransing R.S., A model of microstructural solidification during mould filling for squeeze forming processes, 4th International Conference on Computational Heat and Mass Transfer, 2005-05-17/05-20, Cachan (FR), pp.1122-1125, 2005