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| 1 | Discussion on the Application of LS-DYNA in Superfine Grinding of Wheat Bran显示文摘Superfine grinding, involving the fragmentation mechanism of wheat bran cell tissue, is being employed by milling industry. In order to determine the effect of wheat bran cell tissue on the fragmentation mechanism when using superfine grinding,a technical scheme of the nonlinear finite element numerical simulation method based on LS-DYNA is proposed in this paper.The physiological characteristics of wheat bran structural layers including outer pericarp, intermediate layer and aleurone layer are examined first, and then the mechanical properties of wheat bran structural layers and their effects on the super fine grinding process are analyzed. Secondly, the explicit time integration algorithm of LS-DYNA is introduced, and the application feasibility of LS-DYNA in the analysis of wheat bran superfine grinding mechanism is discussed. Finally, the specific application of LS-DYNA in the determination of grinding form and load, the selection and design of the grinding media and the selection of grinding temperature are discussed in detail in the process of superfine grinding for wheat bran cell tissue. The above research provides a theoretical basis for selecting and developing the equipment and technology suitable for wheat bran superfine grinding, and lays a theoretical foundation for enhancing the quality and efficiency of wheat bran superfine grinding. | CHENG Min LIU Baoguo CAO Xianzhou | 2018 | Grain & Oil Science and Technology2018，1，3： | 3 |
| 2 | 包含微丝的细胞流固耦合模型及其力学响应显示文摘为研究微丝对细胞变形的影响,利用Abaqus建立包含微丝结构的细胞流固耦合模型:其中细胞膜、细胞核和微丝为固体,细胞质为液体。考虑对称性,以细胞模型的一半建立有限元计算模型,采用显式求解器进行模拟计算。仿真结果显示,在细胞压缩变形的情况下,细胞整体刚度随着压缩位移增加而增加,即表示在压缩相同的位移,所需要施加在细胞的荷载更大;对比无微丝的细胞,微丝的存在使细胞刚度大大增加,细胞抵抗外界荷载的能力得到增强;同时微丝排列方向会对细胞的抵抗能力造成一定的影响。 | 柯文俊 刘泽佳 汤立群 董守斌 | 2016 | 科学技术与工程2016，16，19： | 0 |
| 3 | 基于原子力显微镜的细胞破损有限元模型建立与分析显示文摘为获得细胞膜受冲击破损的实际应力应变值。应用原子力显微镜(atomic force microscope,AFM)对Hela细胞进行破膜实验,得到细胞几何参数和加载过程的力-位移曲线。基于实验所得表面形貌与材料参数建立细胞破损有限元模型,并使用ABAQUS进行分析。当针尖位移达到2.35μm时,实验所得破膜力为38.7 nN,模拟所得破膜力为39.3 nN,两者较为吻合,验证了模型的合理性和正确性。通过模拟获得细胞膜被穿破时,应力为24.3 kPa,塑性应变为0.23。本研究基于实验建立的细胞破损有限元模型,为模拟细胞的失效与破损过程提供了方法和参考。 | 杜美洁 王立 王彬 李志强 闫晓鹏 | 2019 | 生物医学工程研究2019，38，3： | 0 |
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