IDENTIFICATION OF ELASTIC-CONSTANTS AND ORIENTATION OF SINGLE-CRYSTALS BY RESONANCE MEASUREMENTS AND FE ANALYSIS

This paper presents an optimization procedure that uses FE analysis to identify the elastic constants of single crystals at elevated tempera tures and the crystal orientation of a specimen based on resonance mea surements. First, the measured natural frequencies are assigned to tho se predicted by an FE model according to the orthogonality of the natu ral modes. Then, the constants and orientation are adjusted by minimiz ing the differences between the measured and calculated frequencies. T he results for single crystals of the Ni-based superalloy SRR99 demons trate the versatility and efficiency of the method.