Current developments on the coupled thermomechanical computational modeling of metal casting processes
Carlos Agelet De Saracibar
, Michele Chiumenti, Miguel Cervera
International Center for Numerical Methods in Engineering (CIMNE), Barcelona, Spain.
ETS Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Cataluna, Barcelona, Spain.
DOI:
https://doi.org/10.7494/cmms.2006.1.0106
Abstract:
In this paper, current developments on the coupled thermomechanical computational simulation of metal casting processes are presented A thermodynamically consistent constitutive material model is derived from a thermoviscoplastic free energy function. A continuous transition between the initial fluid-like and the final solid-like is modeled by considering a J2 thermoviscoplastic model. Thus, an thermoelastoviscoplastic model, suitable for the solid-like phase, degenerates into a pure thermoviscous model, suitable for the liquid-like phase, according to the evolution of the solid fraction function. A thermomechanical contact model, taking into account the insulated effects of the air-gap due to thermal shrinkage of the part during solidification and cooling, is introduced. A fractional step method, arising from an operator split of the governing differential equations, is considered to solve the coupled problem using a staggered scheme. Within a finite element setting, using low-order interpolation elements, a multiscale stabilization technique is introduced as a convenient framework to overcome the Babuska-Brezzi condition and avoid volumetric locking and pressure instabilities arising in incompressible or quasi-incompressible problems. Computational simulation of industrial castings show the good performance of the model.
Cite as:
Agelet De Saracibar, C., Chiumenti, M., Cervera, M. (2006). Current developments on the coupled thermomechanical computational modeling of metal casting processes. Computer Methods in Materials Science, 6(1), 15 – 25. https://doi.org/10.7494/cmms.2006.1.0106
Article (PDF):
Keywords:
Coupled, Thermomechanical, Casting, Multiphysics, Finite elements
References: