Numerical modelling of the mechanical state of deformable gaskets in diamond anvil cell

The technique has been developed for numerical (by the finite element method (FEM)) modelling of the behaviour of a deformable gasket of the diamond anvil cell (with regard to the effects of high pressures and large elastoplastic strains of the gasket material). By solving the problem of the compression of gaskets of T301 hardened stainless steel and pressed lithographic stone (PLS), we have obtained the distribution of elastic and plastic zones in the gaskets, found out a stage by stage occurrence of deformation process, and defined the distribution of stresses along the diamond anvil-gasket interface. The 8-fold and 5,8-fold compression degrees were achieved for a PLS (Odqvist parameter q ∼ 5,5; volumetric elastic strain - 0,7; pressure - 24 GPa) and a steel (q ∼ 3; volumetric elastic strain - 0,7; pressure - 50 GPa) gaskets, respectively.