این فایل شامل فایل های ورد ، پی دی اف و کدهای متلب می باشد.
سر فصل ها
چکیده
المان یک بعدی, دو نودی خرپا
المان یک بعدی, تیر تیموشنکو
المان دو بعدی, سه نودی مثلثی
المان دو بعدی, شش نودی مثلثی
المان دو بعدی, چهار نودی مربعی
قابلیت های هرکد
The discrete element method (DEM) is a promising approach to model machine–granular
material interaction. The accuracy of DEM models depends on the model parameters. In this
study a calibration process is developed to determine the parameter values. Laboratory shear
tests and compressions tests are used to determine the material internal friction angle and
stiffness, respectively. These tests are repeated numerically usingDEMmodels with different
sets of particle friction coefficients and particle stiffness values. The shear test results are
found to be dependent on both the particle friction coefficient and the particle stiffness.
The compression test results show that it is only dependent on the particle stiffness. The
combination of shear test and compression test results can be used to determine a unique
set of particle friction and particle stiffness values. The calibration process is validated by
modelling silo discharge and bucket filling. It is shown that DEM can accurately predict the
silo discharge rate and flow patterns. It is also shown that DEM can predict bucket forces,
fill rates and fill patterns.