抄録
The ultrasonic measurements of the physical properties of soybeans were found to be an effective means to determine dynamic moduli of elasticity at various moisture contents.
The followings can be derived from this experiments.
1. Ultrasonic waves were effectively used for the nondestructive determination of dynamic moduli of elasticity and dynamic Poisson's ratio.
2 The propagation velocity of ultrasonic wave in a soybean increased with the decrease of the moisture contents. This relationship can be used for the continuous and non-destructive detecting of soybean moisture under storage or processing.
3. The dynamic moduli of elasticity of soybeans decreased with the inrease of moisture contents. The effects of moisture content upon the shear modulus and Poisson's ratio were not clear in this experiment.
4. Further research will be suggested to find the effects of moisture content upon the damping characteristics of the ultrasonic wave passing through a soybean.
5. The propagation characteristics of ultrasonic wave in the soybeans in bulk should be studied in the future.
