Institute of Fundamental Technological Research
Polish Academy of Sciences

Partners

R.S. Ransing

Recent publications

Postek E.^♦, 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.	-	other affiliation
Lewis R.W.	-	University of Wales (GB)
Gethin D.T.	-	University of Wales Swansea (GB)
Ransing R.S.	-	other affiliation

Conference papers

1.	Lewis R.W.^♦, Postek E., 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
2.	Postek E., Lewis D.T.^♦, Gethin R.S.^♦, Ransing R.S.^♦, Celentano D.J.^♦, Stress analysis of squeeze forming processes, Plasticity 2005, 11th International Symposium on Plasticity, 2005-01-04/01-08, Kauai (US), pp.136-138, 2005
3.	Ahmad R.^♦, Gethin D.T.^♦, Lewis R.W.^♦, Ransing R.S.^♦, Postek E., 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

Conference abstracts

Postek E.W., Lewis R.W.^♦, Gethin D.T.^♦, Ransing R.S.^♦, Finite element model of mould filling during squeeze forming processes, ACME 2004, 12th Association of Computational Mechanics in Engineering Annnual Conference, 2004-04-05/04-06, Cardiff (GB), pp.1-4, 2004

Abstract:
During mould ﬁlling due to decreasing of liquidus temperature takes place solidiﬁcation pocess. The paper deals mostly with a presentation of an application of a microstructural solidification model. The Navier Stokes equation describing the flow problem is solved using Taylor Galerkin method.

Keywords:
mould filling, microstructural solidification, thermomechanics

Affiliations: