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A very important step in vegetal biomass processing is represented by the plant cutting process. There are many cutting methods/techniques all being different according to the knife characteristics. In order to have the optimum processing equipment, a modelling and simulation analysis is necessary, which can offer answers regarding the cutting process and the stress that takes place during cutting. In this paper cutting operation simulation was analyzed using miscanthus x giganteus stalks. Simulation process was done by using the finite element method (FEM) with the help of ANSYS Multiphysics programme. For simulation, data regarding the plant physical properties as well as the knife properties were entered in the program. Also, for simulation, the theory that miscanthus stalks are formed out of two layers was agreed: miscanthus stalk shell with E = 1.9 GPa and ν = 0.29 (E – elasticity module, ν – Poisson coefficient) and the plants core E = 100 MPa and ν = 0.29. Thus, it was possible to create the plant geometry and the knife used for cutting. Shear stress applied in the simulation program had values of 100 N respectively 250 N. The simulation process was accompanied by experimental research, the miscanthus stalk biomass was subjected to shear stress using type V plate with different opening angles. After testing the force – deformation curves resulted in the shear process. It was concluded that once the average diameter values and the stalk core shell thickness increased, the shear stress increased, the results obtained being in agreement with other experimental research done worldwide by researchers.

Aspects regarding miscanthus cutting process FEM simulation and some experimental data