An elastoplastic cyclic load model originally developed for cohesionless sands was used to describe stress-strain behavior of en masse wheat. The model predicted the inelastic and hysterestic behavior of granular materials during unloading and reloading through the use of a yield surface which underwent a combination of isotropic and kinematic hardening. Model parameters were determined based on monotonic loading results of triaxial tests for en masse wheat with initial bulk density of 817 kg/m**3 and moisture content of 9. 1 percent d. b. In the monotonic loading phase, model simulations of stress-strain behavior compared favorably with test data. Comparisons of model prediction with test data for cyclic unloading and reloading indicated that the model adequately predicted material behavior in the first few cycles, and that the model refinement is necessary to improve prediction accuracy in subsequent cycles.
|Number of pages
|Transactions of the American Society of Agricultural Engineers
|Published - May 6 1988
All Science Journal Classification (ASJC) codes
- Agricultural and Biological Sciences (miscellaneous)