Analysis of Micromechanical Characteristics of Softness Consolidation Abrasives

doi:10.3969/j.issn.1000-1093.2019.05.020

Abstract

Abstract: A model of microscopic contact mechanics inside abrasives group is established to analyze the force chain transfer process. The Li-Dafalias elastoplastic dilatant constitutive model is used to reflect the relationship between micro-force and displacement within the abrasives group. The evolution of force chain network of abrasives group with different porosities and the pressure distribution on workpiece surface were simulated using the three-dimensional particle flow code (PFC3D) software. The simulated results show that, when the porosity exceeds 44%, the internal force chain transmission path of abrasives group disappears; the surface pressure of workpiece exhibits a periodic distribution, and the pressure amplitude decreases with the increase in porosity. A test platform was set up, and the influence laws of porosity and abrasive mesh on the surface roughness of workpiece can be concluded after a series of polishing experiments by pneumatic grinding wheels with softness consolidation abrasives. The experimental results show that the contour arithmetic mean deviation of workpiece surface roughness is small and decreases from 313.744 nm to 67.11 nm when the abrasive mesh is 800 and the porosity is 24%. Key

Key words: softnessconsolidationabrasivegroup, pneumaticwheel, dilatancyeffect, scratchescontrolling, constitutivemodel, roughness, micromechanicalcharacteristic

CLC Number:

TG580.1⁺1

JI Shiming， QIU Wenbin， ZENG Xi， XI Fengfei， QIU Lei， ZHENG Qianqian， SHI Meng. Analysis of Micromechanical Characteristics of Softness Consolidation Abrasives[J]. Acta Armamentarii, 2019, 40(5): 1068-1076.

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第40卷第5期
2019 年5月兵工学报ACTA
ARMAMENTARIIVol.40No.5May2019

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