Finite-element analysis on pressure transfer mechanism in large-volume cubic press

摘要

Pressure transmission inside a large-volume cubic press was examined using finite-element (FE) simulations. Calculations were carried out for the pyrophyllite P-transmitting mediums (32.5x32.5x32.5mm(3)). The cell pressures of the simulations were chosen as representative values, including 3.75 and 5.5GPa. A modified constitutive model for pyrophyllite and more realistic modelling were proposed. The global pressure fields were displayed using the contour plots. The results reveal that (1) at the centre of the pyrophyllite cube exists a region of constant quasi-hydrostatic pressure (RoCQHyP) where the pressure drop is less than 50MPa; (2) how mechanical property (e.g. bulk modulus) of the P-transmitting medium affects cubic press P-transmitting performance. The simulated results were corroborated by high pressure experiments.