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BK7材料划痕中划痕方向对材料去除及摩擦特性影响的实验与数值研究

Experimental and Numerical Investigation on the Effect of Scratch Direction on Material Removal and Friction Characteristic in BK7 Scratching.

作者信息

Wang Wei, Wan Zhenping, Yang Shu, Feng Junyuan, Dong Liujie, Lu Longsheng

机构信息

School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.

出版信息

Materials (Basel). 2020 Apr 14;13(8):1842. doi: 10.3390/ma13081842.

DOI:10.3390/ma13081842
PMID:32295306
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7215324/
Abstract

In order to study the influence of scratch direction on the deformation characteristics and material removal mechanism of optical glass BK7, nanoscratching experiments were conducted on a Nano indenter using Vickers indenter. Results indicate that the face-forward scratch is more likely to induce the initiation and propagation of lateral cracks, which is found to be more beneficial to material removal processes; in contrast, small chips and debris are released from the machined grooves without introducing lateral cracks in the edge-forward condition, leading to poor material removal efficiency. In addition, the choice of scratch direction can make differences to the elastic recovery rate of optical glass BK7. The results revealed that both the elastic recovery rate and the residual stresses of the material under the face-forward scratching are greater than those of the edge-forward scratching. A theoretical model for coefficient of friction (COF) under different scratch directions was established. It is found that the COF between indenter and workpiece in the edge-forward scratching is larger than the face-forward scratching under otherwise identical conditions, this finding is consistent with experimental results. A stress field analysis using finite element method (FEM) was conducted to understand the different crack initiation and propagation behaviors from different scratch directions. The current study discusses the significance of scratch direction on material removal behavior of optical glass BK7, and the results would encourage further research on investigating the connections between tool geometry and material removal mechanism.

摘要

为了研究划痕方向对光学玻璃BK7变形特性和材料去除机理的影响，使用维氏压头在纳米压痕仪上进行了纳米划痕实验。结果表明，正面划痕更有可能引发横向裂纹的萌生和扩展，这被发现对材料去除过程更有利；相反，在边缘向前的情况下，小切屑和碎屑从加工槽中释放出来，而不会在边缘引入横向裂纹，导致材料去除效率低下。此外，划痕方向的选择会影响光学玻璃BK7的弹性恢复率。结果表明，正面划痕下材料的弹性恢复率和残余应力均大于边缘向前划痕下的。建立了不同划痕方向下摩擦系数（COF）的理论模型。发现在其他条件相同的情况下，边缘向前划痕时压头与工件之间的COF大于正面划痕时的，这一发现与实验结果一致。采用有限元方法（FEM）进行应力场分析，以了解不同划痕方向下不同的裂纹萌生和扩展行为。当前的研究讨论了划痕方向对光学玻璃BK7材料去除行为的重要性，研究结果将鼓励进一步研究刀具几何形状与材料去除机理之间的联系。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/a210dac90341/materials-13-01842-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/2799a4340810/materials-13-01842-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/7b99a44e9195/materials-13-01842-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/89c365c2b862/materials-13-01842-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/39defd01597b/materials-13-01842-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/b4b98da1949e/materials-13-01842-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1de3/7215324/a210dac90341/materials-13-01842-g012.jpg

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PLoS One. 2015 Jul 6;10(7):e0131886. doi: 10.1371/journal.pone.0131886. eCollection 2015.