作　　者： ; ; ; ;

机构地区： 华南农业大学

出　　处： 《计算机仿真》 2018年第8期194-197,276,共5页

摘　　要： 为了减少玉米在运输、储藏中的损伤,掌握其挤压力学特性,根据玉米的结构特征和属性参数,采用有限元法和试验相结合,建立了玉米有限元模型,分析其应力-应变特性;通过仿真计算与试验测定对比,说明有限元模型分析玉米受力情况与试验结果吻合,采用Mohr-Coulomb理论得出玉米最易断裂破坏区域为胚和角质胚乳交界处。结果表明,仿真计算玉米的抗压强度为6.41MPa,变形能为0.0988m J;试验测得玉米的抗压强度为5.64MPa,变形能为0.0922m J,其抗压强度误差为13.7%,变形能误差为7.2%,说明有限元模型可有效分析玉米的应力-应变特性及其损伤机理,为研究玉米运输储藏过程的受力损伤提供了分析模型。 In order to reduce the damage of maize in the transportation and storage, and master the compression properties of maize, according to the structural characteristics and attribute parameters, a maize finite element model was established and the stress - strain characteristics of maize were analyzed by using the finite element method and test. Compared simulation with the test, the results show that the stress analysis of finite element model is consistent with test. The fracture area of maize is at the junction of embryo and cutin endosperm based on the Mohr - Coulomb theory. The results show that the compressive strength is 6. 41MPa and deformation energy is 9. 0988 m.] based on fi- nite element simulation. The compressive strength is 5.64MPa and deformation energy is 0. 0922 mJ by test. The compressive strength error between test and simulation is within 13.7%. And deformation energy error between test and simulation is within 7.2%. It shows that the finite element model can effectively analyze stress - strain characteristics and damage mechanism of maize. It provides an analysis mode for studying the stress bruise of maize in trans- port and storage process.

关 键 词： 玉米 有限元模型 应力一应变特性

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