基于赫兹接触理论的核桃破壳 分析与试验研究.

Objective] This paper aimed to improve the hatching rate of walnut, the whole kernel rate and high dew kernel rate. [ Method] Based on Hertz contact theory, the curvature radius of the optimal contact surface was calculated to be - 33.64 mm, and then designed the three different kinds of contact surface which were a plane, concave spherical surface and the the sharp point, respectively. The three contact models were modeled and the static module was used for contact simulation in ANSYS workbench to analyze the stress, strain and deformation cloud map. [ Results ] When the contact surface was a concave sphere, the stress and deformation cloud map had the largest area distribution. Moisture content and compression stroke as well as the interface type chose as the three factors in the orthogonal experiment. Factors level : When the moisture content was 20 %, the extrusion stroke was 6 mm, the contact surface type was concave sphere with curvature radius of 33.64 mm, the shell cracking effect was the best, and the type of contact surface had the most significance influence on the cracking result. [ Conclusion] In the optimal conditions of test results, the comprehensive evaluation value was 2.82, and concave sphere with curvature radius of 33 . 64 mm could significantly improve walnut shell cracking effect. [ABSTRACT FROM AUTHOR]