Studies on the Mechanical properties of Agricultural products (IV)

Poisson's ratio of biological products and a tentative measurement method

Abstract

This report presents a simple measurement apparatus for poisson's ratio of agricultural products which was devised based on measurement method of the small volume change of cylindrical test pieces by uniaxial compression deformation. We measured the poisson's ratio of sweet potato (SATSUMA IMO), potato, carrot and rubber stopper by means of the measurement method with the apparatus and reported the data of the poisson's ratio and compressive elasticity of each of them. At present, it is difficult to measure the ratio directly but the results thus obtained have considerable reliability.
The experimental results are summarised as follows:
1) In the values of mechanical properties of agricultural products, especially in poisson's ratio and compressive elasticity, the deviation of the measured values was large even if samples from the same species were used.
2) The obtained values are summarised as in the next table.