Experimental and Numerical Investigation on the Effect of Scratch Direction on Material Removal and Friction Characteristic in BK7 Scratching
Abstract
:Highlights
- Nanoscratching characteristics of optical glass BK7 using Vickers indenter under different scratch directions were experimentally investigated.
- Both the elastic recovery rate and surface deformation behavior of optical glass BK7 were greatly affected by the scratch direction.
- Lateral cracks were found to be more likely to initiate under face-forward scratch direction.
- A novel theoretical model incorporating the effect of scratch direction was developed to predict the coefficient of friction during scratching.
- Stress field analysis after scratching was conducted by finite element method to understand the different crack initiation and propagation behaviors from different scratch directions.
1. Introduction
2. Experimental Details
2.1. Experimental Setup
2.2. Specimen Characterization and Measurement
3. Results and Discussion
3.1. The Effect of Scratch Direction on Elastic Recovery Rate
3.2. The Effect of Scratch Direction on Friction Characteristics
3.2.1. Theoretical COF Model for Edge-Forward and Face-Forward Nanoscratching
3.2.2. Comparison of the Theoretical and Experimental Results
3.3. The Effect of Scratch Direction on Surface Deformation, Lateral Cracks Development, and Material Removal Behavior
3.3.1. Surface Deformation and Material Removal Behavior in Face-Forward Scratching
3.3.2. Surface Deformation and Material Removal Behavior in Edge-Forward Scratching
3.4. Numerical Simulation by FEM
4. Conclusions
- (1)
- The results showed that both the elastic recovery rate and the residual stress of the material under the face-forward scratching were greater than that in the edge-forward scratching.
- (2)
- Scratch directions have a significant influence on the lateral crack generation and the material removal of optical glass BK7. It is found that face-forward scratching was more prone to the initiation and continuous propagation of lateral cracks than edge-forward scratching, which would eventually lead to more material removal under the same scratching condition, this is consistent with the results of the FEM simulation.
- (3)
- A theoretical model for COF incorporating the scratch direction effect was established and discussed. A more systematic nanoscratching COF model for Vickers indenter was established. The influences of the indenter including angle and the scratch direction were considered in the developed theoretical model and discussed analytically and experimentally. The results showed that COF in face-forward scratching was smaller than the edge-forward scratching.
- (4)
- The scratch direction based on edge-forward or face-forward in this study can be appropriately selected according to the morphology and surface quality of the machined groove. The face-forward scratch is more likely to introduce the initiation and propagation of lateral cracks to the surface because of the larger residual stress, while the edge-forward scratch is more likely to cause the chip to discharge from both sides of the groove because of the larger COF. The experimental results matched the theoretical COF model and FEM simulation well. This is considered to be more beneficial to material removal.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Chemical Composition (wt %) | |||||
---|---|---|---|---|---|---|
SiO2 | B2O3 | K2O | BaO | Na2O | As2O3 | |
BK7 Glass | 69.13 | 10.75 | 6.29 | 3.07 | 10.40 | 0.36 |
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Wang, W.; Wan, Z.; Yang, S.; Feng, J.; Dong, L.; Lu, L. Experimental and Numerical Investigation on the Effect of Scratch Direction on Material Removal and Friction Characteristic in BK7 Scratching. Materials 2020, 13, 1842. https://doi.org/10.3390/ma13081842
Wang W, Wan Z, Yang S, Feng J, Dong L, Lu L. Experimental and Numerical Investigation on the Effect of Scratch Direction on Material Removal and Friction Characteristic in BK7 Scratching. Materials. 2020; 13(8):1842. https://doi.org/10.3390/ma13081842
Chicago/Turabian StyleWang, Wei, Zhenping Wan, Shu Yang, Junyuan Feng, Liujie Dong, and Longsheng Lu. 2020. "Experimental and Numerical Investigation on the Effect of Scratch Direction on Material Removal and Friction Characteristic in BK7 Scratching" Materials 13, no. 8: 1842. https://doi.org/10.3390/ma13081842