Caculations of modulus in different directions for single-crystal alloys.

Single crystal turbine blade alloys have directional elastic properties, so that the orientation of the crystallographic structure relative to the geometrical axes of the engineered component assumes considerable importance in controlling performance, particularly in terms of creep, fatigue and vibration frequencies. This Measurement Note describes methods of obtaining the directional elastic properties based on tensor notation, and correlates these with the angular dependence of the more-familiar Young’s modulus and shear modulus. The effects of temperature on measured modulus are also described.