基于离散元法的金属粉末压制加载速度对压力分布影响?
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摘要
基于离散元原理,采用三维离散元软件PFC3D模拟冲头加载过程,研究以不同冲头速度撞击金属粉末颗粒所产生的透射波以及对侧壁的压力分布。结果表明,对于离散性介质,冲击加载下的应力波传播不单受到颗粒材质波阻抗的影响,还受到颗粒运动和力链形成的很大影响。通过对比不同冲击加载速度下阴模底部的受力,发现随着冲击速度的提高,透射波的峰值成线性增长;通过均分阴模侧壁的方式得到侧壁不同位置所受的侧压力峰值,发现侧壁所受压力呈波谷式分布,从而分析得到颗粒间力链的传播和分布规律。
The punch loading process was simulated by three-dimensional discrete element software PFC3 D based on discrete element method(DEM), the effects of punch loading speeds on the transmission wave of metal powders generated by the impact and the pressure distribution on the sidewall were investigated. In the results, for the discrete media, the stress wave propagation under impact loading is determined not only by the wave impedance of particle material, but also by the particle motion and force chain formation. By comparing the force on the bottom of female mold in the different loading speeds, it is found that the peak of transmission wave increases linearly with the increase of loading speed. The lateral pressure peak on different positions is obtained by means of the side wall of female mold. It is found that the pressure on the sidewalls is present as the valley-like distribution, and the propagation and distribution of the inter-particle force chains are analyzed.
The punch loading process was simulated by three-dimensional discrete element software PFC3 D based on discrete element method(DEM), the effects of punch loading speeds on the transmission wave of metal powders generated by the impact and the pressure distribution on the sidewall were investigated. In the results, for the discrete media, the stress wave propagation under impact loading is determined not only by the wave impedance of particle material, but also by the particle motion and force chain formation. By comparing the force on the bottom of female mold in the different loading speeds, it is found that the peak of transmission wave increases linearly with the increase of loading speed. The lateral pressure peak on different positions is obtained by means of the side wall of female mold. It is found that the pressure on the sidewalls is present as the valley-like distribution, and the propagation and distribution of the inter-particle force chains are analyzed.
引文
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[3]He J,Xiao Z Y,Guan H J,et al.High velocity compaction behavior and sintered properties of pure Ti powder.Powder Metall Technol,2016,34(3):178(何杰,肖志瑜,关航健,等.纯钛粉高速压制行为及其烧结性能研究.粉末冶金技术,2016,34(3):178)
[4]Yu M M,Pan S Y,Shen X P,et al.Current progress and prospect of numerical simulation in powder compaction.Powder Metall Ind,2017,27(4):49(尤萌萌,潘诗琰,申小平,等.粉末压制过程数值模拟的研究现状及展望.粉末冶金工业,2017,27(4):49)
[5]Hu J H,Shang H S,Cheng C,et al.Research progress of metal powder compression theory and technology.Hot Working Technol,2012,41(20):45(胡建华,尚会森,程呈,等.金属粉末压制成形理论与工艺进展.热加工工艺,2012,41(20):45)
[6]Sun J,He P S,Qi M J.Parameter calibration of discrete element numerical simulation by particle flow PFCsoftware.Shandong Ind Technol,2016(10):42(孙婧,何佩珊,齐梦菊.关于颗粒流软件PFC的离散元数值模拟参数标定.山东工业技术,2016(10):42)
[7]Xu Y,Sun Q C,Zhang L,et al.Advances in discrete element methods for particulate materials.Adv Mech,2003,33(2):251(徐泳,孙其诚,张凌,等.颗粒离散元法研究进展.力学进展,2003,33(2):251)
[8]Cheng Y F,Guo S J,Lai H Y.Computer simulation of random packing of spherical particles.J Univ Sci Technol Beijing,1999,21(4):387(程远方,果世驹,赖和怡.球形颗粒随机排列过程的计算机模拟.北京科技大学学报,1999,21(4):387)
[9]Zheng Z S,Zhu Y P,Pei Z X,et al.Characteristics of stress wave propagation in high velocity compaction.J Syst Simul,2009,21(Supple 2):226(郑洲顺,朱远鹏,裴朝旭,等.高速压制成形中应力波传播的特征.系统仿真学报,2009,21(增刊2):226)
[10]Du X,Ceng Y W,Gao R,et al.Effects of particle shape on friction mechanism based on discrete element method.JSouthwest Jiao Tong Univ,2012,47(2):252(杜欣,曾亚武,高睿,等.用离散元方法研究颗粒外形对摩擦机理的影响.西南交通大学学报,2012,47(2):252)
[11]Cao M Y,Dong G J,Zhao C C.Research on pressure-transfer characteristics in the solid granule medium forming based on the discrete element method.JMech Eng,2011,47(14):62(曹秒艳,董国疆,赵长财.基于离散元法的固体颗粒介质传力特性研究.机械工程学报,2011,47(14):62)
[12]Yi M J,Yin H Q,Qu X H,et al.Influence of force and stress wave on the quality of green compacts in high velocity compaction.Powder Metall Technol,2009,27(3):207(易明军,尹海清,曲选辉,等.力与应力波对高速压制压坯质量的影响.粉末冶金技术,2009,27(3):207)
[13]Huang Z M,Ma Z G,Zhang L,et al.A numerical study of macro-mesoscopic mechanical properties of gangue backfill under biaxial compression.Int J Min Sci Technol,2016,26(2):309
[14]Zhang W,Zhou J,Yu S W,et al.Quantitative investigation on force chains of metal powder in high velocity compaction by using discrete element method.J Mech Eng,2018,54(10):85(张炜,周剑,于世伟,等.离散元法金属粉末高速压制过程中力链特性量化研究.机械工程学报,2018,54(10):85)
[15]Sun Q C,Wang G Q.Force distribution in static granular matter in two dimensions.Acta Phys Sin,2008,57(8):4667(孙其诚,王光谦.静态堆积颗粒中的力链分布.物理学报,2008,57(8):4667)
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