锻压技术

沙柳颗粒在不同破碎程度下致密成型的拱效应

英文标题：Arch effect for salix granules dense forming under different breakage degrees

作者：李震沙潜毅李金达郭新宇

单位：内蒙古科技大学

关键词：沙柳颗粒拱效应破碎单轴压缩力链

分类号：TK6

出版年,卷(期):页码：2023,48(2):111-117

摘要：

生物质成型过程中大部分颗粒均处于高应力状态，导致颗粒发生部分破碎。颗粒破碎改变了整体颗粒的级配特性，对其宏微观力学特性有着显著的影响。为了优化生物质成型过程，需要建立微观与宏观之间的联系。通过PFC3D软件构建了单轴压缩模型，研究了生物质在不同破碎程度下的成型过程，探究了力链形成和拱效应对该过程的影响规律，并分析了成型过程中的应力-应变曲线、动能变化和力链网络，验证了颗粒破碎程度的增加可以从轴向上增加力链的数量，破碎程度越大拱形结构的破坏越多。明确了颗粒的破碎会对力链网络以及拱形结构的演变产生一定的影响。

During the forming process of biomass, most granules are in a high stress state, resulting in partial breakage of granules. Granule breakage changes the grading characteristics of the overall granule and has a significant influence on its macro and micro mechanical properties. In order to optimize the biomass forming process, it is necessary to establish a link between micro and macro. Therefore, a uniaxial compression model was constructed by software PFC3D, and the forming processes of biomass under different breakage degrees were studied, the influence laws of force chain formation and arch effect on the process were explored, and the stress-strain curve, kinetic energy change and force chain network during the forming process were analyzed to verify that the increasing of granule breakage degree increases the number of force chains in the axial direction, and the greater the breakage degree is, the more damage the arch structure is. Thus, it is clear that the granule breakage has a certain impact on the force chain network and the evolution of arch structure.

基金项目：

内蒙古自治区自然科学基金资助项目(2020LH05020);国家自然科学基金资助项目(51666016)

作者简介：李震（1973-），男，博士，教授，E-mail：lizhen_730106@126.com；通信作者：沙潜毅（1997-），男，硕士研究生，E-mail：1104598447@qq.com

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