DETERMINATION OF POISSON'S RATIO AND YOUNG'S MODULUS OF RED BEAN GRAINS

Abstract

ABSTRACTIn this study, the Poisson's ratio and Young's modulus of red bean grains were determined as a function of moisture content (5, 7.5, 10, 12.5 and 15% w.b.) and loading rate (3, 6, 9, 12 and 15 mm/min) for Goli and Akhtar varieties. Quasi‐static compression loading was carried out, and both unit lateral extension and unit normal compression values were determined. Average Poisson's ratio values from 0.322 to 0.267 and from 0.406 to 0.340 were obtained for moisture levels ranging from 5 to 15%, for Goli and Akhtar varieties, respectively. Poisson's ratio increased from 0.257 to 0.332 and from 0.346 to 0.405 at loading rates of 3 to 15 mm/min, for Goli and Akhtar varieties, respectively. Young's modulus of elasticity decreased as moisture content increased and increased with increasing loading rate for both varieties. These finding will be useful in predicting the load deformation behavior of red bean grains.PRACTICAL APPLICATIONSOwing to the fact that there is not enough information about Poisson's ratio of grains, in this study, the goal function is to determine the Poisson's ratio of red bean ((Phaseolus vulgaris L.) grain during applied compression load under various conditions. In order to obtain Young's modulus and some other mechanical properties, Poisson's ratio of red bean grain needs to be known. These results may be used by manufacturers in order to design harvesting machines or other mechanical devices such as sorting and separating machines.