Computational methods for the analysis of, non-contact creep deformation, in ZrB_2- SiC composites

摘要

A need for higher service temperatures is driving development of new, higher temperature materials that are resistant to creep. However, conventionalmethods of measuring creep become increasingly difficult over about 1700℃. A non-contact method with the capability of measurements at muchhigher temperature has been demonstrated on niobium using centrifugal loading of a spherical sample. Recent efforts have been made to extendthis method to lower temperatures and higher stresses. Using material properties from the literature, we performed finite element simulations todetermine the range of experimental parameters over which non-contact measurements of creep can be readily finished within a reasonable timeduration for ZrB2 and ZrB_2 + 25 vol.% SiC. Results from finite element analysis (FEA) model shows that the experiments are feasible at an angularvelocity of 32,000 rps and a temperature 1900℃ for ZrB_2 + 25 vol.% SiC, but not for the pure ZrB_2 under the range of experimental conditionsavailable.