Abstract
The macroscopic elasticity of a polycrystalline material is more or less anisotropic due to the presence of texture. In this Paper, the change in such elastic anisotropy with plastic deformation was studied ultrasonically. Test specimens prepared from a rolled plate of mild steel were deformed plastically by uni-axial compression, and the relative retardation and polarization directions of two independent transverse waves were measured by analysing frequency spectra of ultrasonic waves. It was confirmed from the results that the plastic deformation changes not only the degree of the elastic anisotropy but also its principal axes towards those of the plastic strain. A preliminary consideration was presented concerning the relation between the elastic stiffness and small plastic strain.
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