Effect of Sample Tilt and Normal Load on Micro-Scratch Test of Copper with a Spherical Indenter

被引：0
|
作者：
Liu M. [1 ]
Huang C. [1 ]
Gao C. [1 ]
机构：
[1] Fuzhou University, School of Mechanical Engineering and Automation, Fuzhou
来源：
Mocaxue Xuebao/Tribology | 2021年 / 41卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Constant normal load; Friction coefficient; Micro-scratch; Sample tilt; Scratch hardness; Spherical indenter;
D O I：
10.16078/j.tribology.2020047
中图分类号：
学科分类号：
摘要：
Micro-scratch experiments were performed on copper with a spherical indenter, and the effect of sample tilt on the scratch response of copper under different constant normal loads was studied. The results showed that the experimentally measured nominal friction coefficient was linearly related to the sample tilt angle, with their slope being unaffected by the normal load. The geometrical model considering the positional relationship between the spherical indenter and the tilted sample was established. It was found that the inclination of the sample had no effect on the adhesive component of the nominal friction coefficient, and the ploughing component of friction coefficient linearly changed with the tilt angle. The friction coefficients can be corrected by a sphere-to-flat contact mechanical model for tilted samples, so as to obtain the true friction coefficients corresponding to the condition without tilting. There was a non-linear relationship between the friction coefficient and the normal load with the ploughing component increasing linearly with the normal load, while the adhesive component increased non-linearly and then gradually stabilized. The residual scratch width measured by the scratch topography was hardly affected by the tilt of the sample, and had a linear relationship with the square root of the normal load. The change of scratch hardness with normal load was analyzed, and the scratch hardness calculated from the residual scratch width was found to be a constant value, while the scratch hardness calculated from the projected contact area increased with normal load, and then gradually stabilized. Copyright ©2021 Tribology. All rights reserved.
引用
收藏
页码：27 / 37
页数：10
相关论文
共 43 条
  • [1] Sakamoto T, Tsukizoe T., Friction and prow formation in a scratch process of copper by a diamond cone, Wear, 44, 2, pp. 393-403, (1977)
  • [2] Zhang Yafeng, He Hongtu, Yu Jiaxin, Et al., AFM nanoscratch behaviors of three optical glasses used in ICF, Tribology, 38, 3, pp. 349-355, (2018)
  • [3] Tseng A A., A comparison study of scratch and wear properties using atomic force microscopy, Applied Surface Science, 256, 13, pp. 4246-4252, (2010)
  • [4] Huang Ping, Xu Kewei, Han Yong, Preparation and scratch behavior of plasma oxidation film on titanium, China Surface Engineering, 17, 3, pp. 26-29, (2004)
  • [5] Akono A T, Randall N X, Ulm F J., Experimental determination of the fracture toughness via microscratch tests: Application to polymers, ceramics, and metals, Journal of Materials Research, 27, 2, pp. 485-493, (2012)
  • [6] Liu Ming, Li Shuo, Gao Chenghui, Fracture toughness measurement by micro-Scratch tests with conical indenter, Tribology, 39, 5, pp. 556-564, (2019)
  • [7] Liu Ming, Wu Jianan, Gao Chenghui, Sliding of a diamond sphere on K9 glass under progressive load, Journal of Non-Crystalline Solids, 526, (2019)
  • [8] Dong Zhang, Yuan Sun, Gao Chenghui, Et al., Measurement of fracture toughness of copper via constant-load microscratch with a spherical indenter, Wear, 444-445, (2019)
  • [9] Tabor D., The physical meaning of indentation and scratch hardness, British Journal of Applied Physics, 7, 5, pp. 159-166, (1956)
  • [10] Shi H, Atkinson M., A friction effect in low-load hardness testing of copper and aluminium, Journal of Materials Science, 25, 4, pp. 2111-2114, (1990)
12345