Partner: Richard Lewis

University of Wales (GB)

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.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
2.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