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| 1 | Quantified evaluation of particle shape effects from micro-to-macro scales for non-convex grains显示文摘 | Y. Yang J.F. Wang Y.M. Cheng | 2016 | Particuology2016，14，2： | 8 |
| 2 | DEM investigation of angle of repose for super-ellipsoidal particles显示文摘We explore the effect of particle shape on the angle of repose (AoR) in granular packing using a three-dimensional discrete element method.Non-spherical particles were modeled using super-ellipsoids characterized by aspect ratio and blockiness.The relationship between AoR and particle shape was examined,followed by a series of analyses on the origin of AoR from a microscopic perspective.Results show that,with blockiness deviating from unity,AoR has an approximate 'M' shape that exhibits a strong to weak trend with aspect ratio,matching results of previous reports.Another finding suggests a parabolic relationship between normalized AoR and normalized coordination number,AoR increases with anisotropy related more with the anisotropy of particle orientation than with the anisotropy of contact normal.Particle shape is more likely to affect AoR by affecting the tangential force than the normal contact force.An analysis based on traction indicates that dips in stress associated with the tangential force (compared with the normal force) and non-spherical particles (compared with spheres) are more significant.For various particle shapes,AoR is positively correlated with friction mobilization but is negatively correlated with friction mobilization for various coefficient of friction. | Hao Chen Shiwei Zhao Xiaowen Zhou | 2020 | Particuology2020，18，3： | 6 |
| 3 | 沥青搅拌设备多层振动筛分效率计算及影响规律研究显示文摘针对以往沥青搅拌设备振动筛分效率计算未考虑细粒度与粗粒度物料混杂的情况,提出基于离散单元法的颗粒动力学分析获得不同粒度物料的占比,进一步结合格氏法与总效率公式建立沥青搅拌设备多层直线振动筛的筛分效率计算方法。首先建立多层直线振动筛以及物料颗粒的三维模型,基于离散单元法进行颗粒动力学分析,获得筛上物与筛下物中不同粒度颗粒的分布情况。然后建立筛分产品产率问题的优化函数,代入颗粒分布计算结果,通过线性规划方法计算产品产率以及各层物料中不同粒度颗粒的占比,最后根据总效率公式计算多层振动筛各层的筛分效率。现场试验验证了筛分效率计算方法的有效性。进一步研究振动参数的影响可以知道,当振动频率控制在18 Hz^20 Hz之间,振动方向角在70o^80o,筛面倾角位于11o^16o之间,振动筛筛分效率能够处于较合理控制范围。 | 贺朝霞 胡明建 杨龙飞 | 2018 | 噪声与振动控制2018，38，3： | 2 |
| 4 | 华南风化花岗岩劈拉断裂行为的试验与细观模拟研究显示文摘为研究不同风化程度花岗岩在劈拉受载下的破损行为,该文对广东从化地区新鲜、微风化、中风化三种风化程度的花岗岩进行微观特征测量及巴西圆盘试验研究。分别基于考虑空间相关特征的随机模型和数字图像技术两种方法实现对岩样细观结构的表征,结合细观参数反演技术,建立反映岩石细观非均质组构特性的颗粒离散元模型,对花岗岩劈拉试验进行数值仿真试验研究。结果表明,随着风化级别的提高,花岗岩中粘结力较强的长石等矿物向粘土矿物转化,结晶强度降低,微孔隙等软弱结构增多,岩石宏观力学性能不断劣化,劈拉破坏由单一裂纹主导转为多条分叉状裂纹,岩样脆性也逐渐减弱。基于两种方法建立的细观随机力学模型仿真结果均表明岩样的劈拉强度随风化级别的提高逐渐降低,与试验结果变化趋势相符,分析得到不同风化花岗岩的劈拉破裂响应特征与试验结果一致,且从细观层面对花岗岩样受劈拉作用的渐进破裂响应提供了深入认识。 | 唐欣薇 黄文敏 周元德 康政 | 2017 | 工程力学2017，34，6： | 2 |
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