锻压技术

沙柳细枝颗粒压缩成型过程中的模型研究

英文标题：Research on model for Salix psammophila granules in compression process

作者：李震闫莉高雨航王宏强王鹏德雪红

单位：内蒙古科技大学

分类号：S781.29

出版年,卷(期):页码：2020,45(1):89-95

摘要：

用内蒙古西部地区特有的沙柳材料进行闭式生物质压缩成型实验；由于沙柳颗粒等这类颗粒材料特有的离散性和非连续性，将这类颗粒物质归入软物质范畴，使用离散元软件EDEM进行仿真模拟，探究沙柳颗粒压缩成型过程，分析其在压缩成型过程中黏弹塑性力学变化，创建在进料预压、致密成型、应力松弛这3个阶段中力学模型或本构模型，采用1st Opt软件进行数值模拟，确定力学模型和本构模型中的未知参数；将离散元和有限元进行耦合，分析模具受力和变形。结果发现：通过显著性检验验证了使用离散单元法模拟生物质压缩成型具有准确性和可行性；通过1st Opt拟合数据后得到的相关系数表明其拟合程度较好，提出的力学模型和本构模型对部分成型机的设计参数提供理论基础。耦合仿真表明，应力和变形均沿模具轴线自上而下增大。

The closed form biomass compression experiments were conducted by Salix psammophila materials peculiar to western area of Inner Mongolia. Due to the discrete and discontinuous characteristics of such granular materials, such as Salix psammophila granules, such particulate matter was classified into soft matter, and the simulation was realized by discrete element software EDEM. Then, the compression process of Salix psammophila granules was investigated, and the viscoelastic-plastic mechanical changes during compression process were analyzed to create the mechanical model or constitutive model in the three stages of feed preloading, compact forming and stress relaxation. Furthermore, the above stages were simulated numerically by 1st Opt software to determine unknown parameters in the mechanical and constitutive models, and the force and deformation of mold were analyzed by coupling the discrete element and the finite element. The results show that the use of discrete element method to simulate biomass compression has accuracy and feasibility which is verified by significance test, and the correlation coefficient obtained by fitting data with 1st Opt indicates that the degree of fitting is good. Therefore, the proposed mechanical and constitutive models provide a theoretical basis for the design parameters of some forming tools. The coupling simulation shows that both stress and deformation increase from top to bottom along the axis of mold.

基金项目：

国家自然科学基金资助项目(51666016,51766016)；内蒙古自治区自然科学基金(2016MS0544)

李震(1973-)，男，博士，教授，硕士研究生导师 E-mail：lizhen_730106@126.com

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