TY - JOUR
T1 - Subsurface damage model in single and double scratching of fused silica with a blunt indenter
AU - Xiao, Huapan
AU - Zhang, Fan
AU - Yin, Shenxin
AU - Cheung, Chi Fai
AU - Wang, Chunjin
N1 - Funding Information:
The authors would like to express thanks to Innovation and Technology Commission (ITC) of the Government of the Hong Kong Special Administrative Region , China ( GHP/142/19SZ ), the research studentships from the Research Committee of The Hong Kong Polytechnic University (RH5Q), National Natural Science Foundation of China ( 12104074 ), China Postdoctoral Science Foundation ( 2020M683233 ), and Chongqing Special Postdoctoral Science Foundation ( XmT20200021 , XmT20200043 ).
Publisher Copyright:
© 2023
PY - 2023/7/15
Y1 - 2023/7/15
N2 - The subsurface damages (SSDs) generated during abrasive processes greatly impact the service performance and life of the devices or components made from brittle materials. The abrasive processes can be simplified as multi-scratching where the abrasive grits tend to be blunt. Consequently, the evaluation of SSDs in the scratching with a blunt indenter is worth of study. In this paper, by extending the blunt indenter-related indentation fracture mechanics and deriving the analytic equations for the contact areas between the indenter and the workpiece, a theoretical SSD depth model is first developed for the single and double scratching of brittle materials. The model correlates the depth of subsurface cone, median, and lateral cracks with the indenter nose radius, scratching depth, residual depth, normal load, tangential load, scratch spacing, and workpiece material properties. To validate the model, scratching experiments are carried out on polished fused silica under different scratch spacing, and the effects of scratch spacing on the surface/subsurface morphologies of scratch grooves, scratching load, and friction coefficient are investigated experimentally. The results show that the radial, cone, median, and lateral cracks are coexistent in fused silica. The second scratching leads to an increase in the fracture degree of the first one, while the SSD depth in double scratching approximates that in single scratching. A small scratch spacing leads to an increase in tangential load or friction coefficient while a decrease in normal load. It is proven that the theoretical model can accurately determine the upper/lower bounds of scratching normal load and subsurface crack depth considering the workpiece fracture degree. Moreover, it is revealed that the SSD depth increases slightly with an increased friction coefficient. This research contributes to the evaluation of SSDs in the abrasive-processed fused silica or similar brittle materials.
AB - The subsurface damages (SSDs) generated during abrasive processes greatly impact the service performance and life of the devices or components made from brittle materials. The abrasive processes can be simplified as multi-scratching where the abrasive grits tend to be blunt. Consequently, the evaluation of SSDs in the scratching with a blunt indenter is worth of study. In this paper, by extending the blunt indenter-related indentation fracture mechanics and deriving the analytic equations for the contact areas between the indenter and the workpiece, a theoretical SSD depth model is first developed for the single and double scratching of brittle materials. The model correlates the depth of subsurface cone, median, and lateral cracks with the indenter nose radius, scratching depth, residual depth, normal load, tangential load, scratch spacing, and workpiece material properties. To validate the model, scratching experiments are carried out on polished fused silica under different scratch spacing, and the effects of scratch spacing on the surface/subsurface morphologies of scratch grooves, scratching load, and friction coefficient are investigated experimentally. The results show that the radial, cone, median, and lateral cracks are coexistent in fused silica. The second scratching leads to an increase in the fracture degree of the first one, while the SSD depth in double scratching approximates that in single scratching. A small scratch spacing leads to an increase in tangential load or friction coefficient while a decrease in normal load. It is proven that the theoretical model can accurately determine the upper/lower bounds of scratching normal load and subsurface crack depth considering the workpiece fracture degree. Moreover, it is revealed that the SSD depth increases slightly with an increased friction coefficient. This research contributes to the evaluation of SSDs in the abrasive-processed fused silica or similar brittle materials.
KW - Fused silica
KW - Modelling
KW - Scratch
KW - Subsurface damage
KW - Ultra-precision machining
UR - http://www.scopus.com/inward/record.url?scp=85150434278&partnerID=8YFLogxK
U2 - 10.1016/j.ijmecsci.2023.108309
DO - 10.1016/j.ijmecsci.2023.108309
M3 - Journal article
AN - SCOPUS:85150434278
SN - 0020-7403
VL - 250
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
M1 - 108309
ER -