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Abstract:
The scratch characteristics in micron scale on 16 kinds of materials (2 kinds of glasses, 2 kinds of polymers, 4 kinds of ceramics, 4 kinds of metals and 4 kinds of metallic glasses) were assessed by means of Rockwell C diamond indentation with progressive load. The results show that these materials all have the maximum scratch retention rate (the ratio of residual indentation depth to indentation depth) related to elastic recovery, which can be used as the transition point of the apparent friction coefficient curve. The apparent friction coefficient of scratches is composed of adhesive friction coefficient and furrow friction coefficient. The three-dimensional mechanical contact model can be used to accurately characterize the friction coefficient except for metallic glass. The initial friction coefficient of the material is related to the Poisson's ratio. Polymeric materials (PC and PMMA) have special double scratch grooves due to stacking and sinking effects. The ratio of the hardness of scratched materials to the indentation hardness for 16 kinds of materials is 0.33~2.5, and there is a linear relationship between the scratch hardness and the volume modulus. The linear elastic fracture mechanics (LEFM) model and microscopic energy size effect (MESEL) model were used to calculate the fracture toughness of the material. The results show that: LEFM model, Akono's MESEL model and Hubler's MESEL model can accurately characterize the fracture toughness of materials with low fracture toughness (glasses, ceramics and polymers), while the deviation of calculation results for metal materials with high fracture toughness is large. Liu's MESEL model can be used to characterize the fracture toughness of materials with large fracture toughness (metallic materials and some metallic glasses). The fracture toughness of the material has a piecewise linear correlation with Poisson's ratio. © 2022, Editorial Office of Chinese Journal of Materials Research. All right reserved.
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Chinese Journal of Materials Research
ISSN: 1005-3093
CN: 21-1328/TG
Year: 2022
Issue: 3
Volume: 36
Page: 191-205
Cited Count:
SCOPUS Cited Count: 7
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 5
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