Simulation of Isothermal Compression Test

摘要

Paper deals with an issue of computer simulation of glass pressing. Attention is paid to accuracy of numerical outputs. Simple forming process - isothermal compression of a glass cylinder is chosen for virtual modelling. The constitutive behaviour of shaped glass is assumed to be nonlinear viscoelastic, based on general Maxwell model. Both viscoelastic response and relaxation behaviour of samples made of lead crystal are evaluated. Computer outputs are verified with experimental measurements in the viscosity range of 10~7-10~(10) Pa s. In this paper results at temperature 611°C (corresponding viscosity 10~(7.4) Pa s) and 587°C (viscosity 10~8 Pa s) are presented. Uniaxial deformation was carried out at various constant pressing rates (in the interval 0.1-8 mm s~(-1)).