IDENTIFICATION OF CONSTANTS OF A VISCOPLASTIC CONSTITUTIVE MODEL FOR A SINGLE-CRYSTAL

In this paper uniaxial experiments conducted at 1033 K with specimens from the cubic face centered, nickel base single crystal alloy SRR99 a re described. Specimens with [001]-orientation and orientations deviat ing considerably form [001] have been used. We describe the results of tension tests with constant strain rate, relaxation tests and creep t ests. From these tests the full set of material constants for a consti tutive model by Choi and Krempl [1] is identified. We compare the expe rimental data with simulations by the model using the identified const ants. The correspondence between simulations and experimental data is satisfactory until good depending on the type of the experiment. Final ly, we describe a comparison between experimental data and simulations where the experiments have not been used for constant identification. The correspondence is very satisfactory. Therefore, we conclude that the model of Choi and Krempl is applicable on practical problems in th e temperature range covered by our experiments.