基于近场动力学模拟的珩磨轮修整过程中立方氮化硼磨粒破碎机理研究

Peridynamic Simulation to Fracture Mechanism of CBN Grain in the Honing Wheel Dressing Process.

作者信息

Wang Fuwei, Chen Yuanlong, Gao Yang, Liang Yuan, Su Jie, Liu Lin

机构信息

School of Mechanical Engineering, Hefei University of Technology, Hefei 230009, China.

College of Mechatronic Engineering, North Minzu University, Yinchuan 750021, China.

出版信息

Micromachines (Basel). 2021 Sep 29;12(10):1186. doi: 10.3390/mi12101186.

DOI:10.3390/mi12101186

PMID:34683237

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8541660/

Abstract

Regularly dressing of CBN honing wheel is an effective way to keep its sharpness and correct geometry during honing process. This study aims to understand the fracture mechanism of single CBN grain in the dressing process of honing wheel. The honing wheel dressing process was simplified into the dressing process of grinding wheel, and the bond-based Peridynamic method considering bond rotation effect was developed to investigate the progressive fracture evolution, stress characteristics, and fracture modes of CBN grains in this process. It was found that fracture evolution of CBN grains mainly underwent four stages: elastic deformation, damage initiation, crack formation, and macro fracture. In addition, the fracture initiation and propagation were mainly determined by the tensile and shear stress, where the former led to mode I fractures and the latter led to mode II fractures. The propagation of mode I fractures was stable while the propagation of mode II fracture was unstable. The results show that the Peridynamic approach has great potential to predict the fracture mechanism of CBN grain in the dressing process of honing and grinding wheels.

摘要

在珩磨过程中，定期修整立方氮化硼（CBN）珩磨轮是保持其锋利度和正确几何形状的有效方法。本研究旨在了解珩磨轮修整过程中单个CBN磨粒的断裂机理。将珩磨轮修整过程简化为砂轮修整过程，并开发了考虑结合剂旋转效应的基于键合的近场动力学方法，以研究该过程中CBN磨粒的渐进断裂演化、应力特性和断裂模式。研究发现，CBN磨粒的断裂演化主要经历四个阶段：弹性变形、损伤萌生、裂纹形成和宏观断裂。此外，断裂的萌生和扩展主要由拉应力和剪应力决定，前者导致I型断裂，后者导致II型断裂。I型断裂的扩展是稳定的，而II型断裂的扩展是不稳定的。结果表明，近场动力学方法在预测珩磨轮和砂轮修整过程中CBN磨粒的断裂机理方面具有很大潜力。