| In order to improve the breaking rate of Sapindus mukorossi nutshell, the breaking mechanical properties of Sapindus mukorossi nutshell was studied. The compression test of whole fruit was carried out on the electronic universal testing machine, then finite element method was applied to analyze the stress and the strain of the three forced directions of nutshell. The results showed that the average shell breaking force of Sapindus mukorossi were 122.08, 95.13, 157.24 N, elastic modulus were 49.62, 40.27, 5016 MPa, and average deformation rate were 13.1%, 9.5% and 11.4% respectively in the horizontal, lateral and vertical directions. The effects of forced direction on shell breaking force and elastic modulus were extremely significant, and Sapindus mukorossi nutshell was anisotropic, with the strongest compression capacity of vertical direction, followed by that of horizontal direction, and the minimal one of lateral direction. The yield strength and deformation amount were larger in the horizontal and vertical directions and they were smaller in the lateral direction. Simulation result of finite element analysis was basically consistent with the experimental result, and it was illustrated that the established mechanical model could be used to analyze the mechanical properties of Sapindus mukorossi nutshell, providing theoretical basis and simulation optimization method for the design of shell breaking machine. |
