Ultrasonic EIastic Properties of Steel under Tensile Stress

概要

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Longitudinal and transverse wave velocities, eight kinds of elastic parameters and dilational and shear dampings of chromium-olybdenum steel have been simultaneously measured at room temperature in terms of acoustoelasticity, by an ultrasonic pulse method. Young, shear and bulk moduli and Lame parameter apparently decrease with increasing tensile stress, suggesting decrement of rigidity. However, decease in Poisson's ratio shows actual enhancement of rigidity due to lattice dilation, accompanied by decrease in longitudinal wave frequency, Debye temperature and Gruneisen parameter. As the stress increases, the dilational damping increases and then saturates over 600 MPa, while the shear one increases abruptly from 600 MPa. This abrupt increase indicates an increase in motion of dislocation for plastic deformation. The atomic dilation enthalpy shows the endothermal process in elastic Geld up to 750 MPa.
社団法人応用物理学会の論文
2000-05-30