PFC2D Simulation Research on Arched Structure of Salix Granules in Dense Forming

The influencing factors of biomass molding play an important role in the entire biomass molding research. This study uses the arch structure to study the relationship between the microscopic and macroscopic influencing factors.Using PFC2D software to carry out uniaxial compression simulation, by changing the two influencing factors of compression speed and forming granularity, the influence of arched structure on the compact forming of Salix granules from the meso level. By analyzing the stress-strain relationship and the changes of various types of energy, the influence of the arched structure on the energy during the compression process is reflected. The research results show that the arched structure formed in the compression process will cause the stagnation or even decrease of the stress and bonding energy; the destruction of the arched structure will also cause a sudden increase in the friction energy of the particles.When the compression speeds are 0.075mm·s-1, 0.1mm·s-1, and 0.125mm·s-1, the number of particles in the arched structure are 55, 60 and 75, respectively, and the boundary energy is transformed into cohesive energy. The efficiencies are 87.2%, 73.8% and 89.9%, respectively. When the molding particle size is 0.1mm to 0.25mm, 0.25mm to 0.4mm, 0.4mm to 0.55mm, the first sudden change in stress during the compression molding process is 0.746MPa, 0.812MPa and 1.161MPa.