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

参考文献：

[1]霍丽丽，赵立欣，田宜水，等. 生物质颗粒燃料成型的黏弹性本构模型[J].农业工程学报，2013，29(9): 200-206.

Huo L L,Zhao L X,Tian Y S,et al.Viscoelastic constitutive model of biomass pellet[J].Transactions of the Chinese Society of Agricultural Engineering,2013，29(9): 200-206.

[2]刘汉龙，孙逸飞，杨贵，等. 粗粒料颗粒破碎特性研究评述[J].河海大学学报：自然科学版，2012，40(4)：361-369.

Liu H L,Sun Y F,Yang G,et al.A review of particle breakage characteristics of coarse aggregates[J].Journal of Hohai University:Natural Sciences,2012，40（4）：361-369.

[3]徐琨，周伟，马刚，等. 基于离散元法的颗粒破碎模拟研究进展[J]. 岩土工程学报，2018，40（5）：880-889.

Xu K,Zhou W,Ma G,et al.Review of particle breakage simulation based on DEM[J].Chinese Journal of Geotechnical Engineering,2018,40(5)：880-889.

[4]刘君，刘福海，孔宪京.考虑破碎的堆石料颗粒流数值模拟[J].岩土力学,2008,29(S1):107-112.

Liu J,Liu F H,Kong X J,Particle flow code numerical simulation of particle breakage of rockfill [J].Rock and Soil Mechanics,2008,29(S1):107-112.

[5]Potyondy D O, Cundall P A. A bonded-particle model for rock[J]. International Journal of Rock Mechanics & Mining Sciences, 2004, 41(8): 1329-1364.

[6]Matteo O C,Marcos A,Francesco C,et al.An approach to enhance efficiency of DEM modeling of soils with crushable grains[J]. Geotechnique,2015,65(2):91-110.

[7]Cleary P W. Charge behavior and power consumption in ball mills: Sensitivity to mill operating conditions, liner geometry and charge composition [J]. International Journal of Mineral Processing,2001, 63(2): 79-114.

[8]Cleary P W. Recent advances in DEM modeling of tumbling mills[J]. Minerals Engineering, 2001,14(10): 1295-1319.

[9]De B J，Mcdowell G.Particle breakage criteria in discrete element modeling [J].Geotechnique,2016，66(12):1014-1027.

[10]徐佳俊, 陈宇龙,曾成华,等.加筋粗粒土直剪力学行为与颗粒破碎特性[J].有色金属:矿山部分,2017,69(4):52-56,103.

Xu J J, Chen Y L, Zeng C H, et al.Mechanical behaviors and particle breakage features of reinforced coarse-grained soil in direct shear test[J].Nonferrous Metals:Mining Section,2017,69(4):52-56,103.

[11]田泽野. 考虑颗粒破碎的粗粒土强度特性研究[D].北京：北京交通大学,2014.

Tian Z Y.Study on Strength Characteristics of Coarse-grained Soils Considering Granular Crushing[D]. Beijing:Beijing Jiaotong University,2014.

[12]杨梅晓. 粗粒土颗粒破碎特性的离散元数值研究[D].大连：大连理工大学,2020.

Yan X M. Numerical Study on Particle Crushing of Coarse-grained Soil Based on Discrete Element Method[D]. Dalian：Dalian University of Technology,2020.

[13]周梦佳，温彦锋，邓刚，等.堆石料单颗粒劈裂试验破碎强度随机性与尺寸效应的三维离散元模拟[J].岩土力学，2019, 40(S1): 503-510.

Zhou M J, Wen Y F, Deng G,et al.Three-dimensional discrete element simulation of random breaking strength and size effect in single particle splitting test of rockfill [J].Rock and Soil Mechanics,2019, 40(S1): 503-510.

[14]杨贵，许建宝，刘昆林.粗粒料颗粒破碎数值模拟研究[J].岩土力学，2015, 36(11): 3301-3306.

Yang G, Xu J B, Liu K L. Particle breakage characteristics of coarse aggregates [J].Rock and Soil Mechanics,2015, 36(11): 3301-3306.

[15]Liu Y M, Liu H B, Mao H J. DEM investigation of the effect of intermediate principle stress on particle breakage of granular materials[J]. Computers and Geotechnics, 2017, 84(8): 58-67.

[16]李震, 高雨航,刘彭,等.沙柳细枝颗粒致密成型过程中力链演变的离散元研究[J].太阳能学报,2019,40(11):3186-3195.

Li Z，Gao Y H，Liu P，et al.Discrete element study on evolution of force-chain during salix grains dense molding[J].Acta Energiae Solaris Sinica,2019,40(11):3186-3195.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】