Abstract
As a high-temperature structural material, ceramic matrix composites play an irreplaceable role in aviation, aerospace, and other fields. However, the difficult-to-machine characteristics of the material lead to the difficulty of material removal, low grinding efficiency, poor grinding surface quality, and other issues. In this paper, an grinding wheel electroplated diamond is used to conduct grinding experiments on carbon fiber toughened ceramic matrix composites; based on experiments and combined with SPH simulation, the grinding removal mechanism of 2.5D-C/SiC composites in different grinding directions (the positional relationship between the feeding direction and the fiber direction) is explored, and the influence of grinding parameters on the surface roughness and surface morphology is investigated. The results show that the primary removal mechanism of grinding 2.5D-C/SiC is brittle fracture. The damage to the material is the combined effect of matrix cracking, interface debonding, fiber fracture, and fiber pullout. When the feeding direction and the processing surface are perpendicular to the fiber direction, more fiber breakage occurs, and the fiber and matrix are simultaneously removed. Compared with other directions, the surface roughness in this direction is more diminutive. When the feeding direction and the machined surface are parallel to the fiber direction, the matrix cracks first, and the fiber breakage under the extrusion of abrasives, accompanied by a small amount of fiber pulling out. When the fiber direction is parallel to the machined surface but perpendicular to the feeding direction, the phenomenon of fiber breakage and fiber pullout is obvious. With the grinding depth (ap) and feeding rate (vw) increase, the surface roughness and the maximum profile height increase, while with the increase in grinding velocity (vs), the surface roughness and the maximum profile height decrease. This study provides important theoretical and practical reference for grinding ceramic matrix composites.
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This work is supported by the National Natural Science Foundation of China: 51905083, 51975113; the Natural Science Foundation of Hebei Province: E2022501004, E2021501027; the Fundamental Research Funds for the Central Universities: N2123025, N2203015; and the China Postdoctoral Science Foundation: 2021MD703912.
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Zhou, Y., Tian, C., Li, H. et al. Study on removal mechanism and surface quality of grinding carbon fiber toughened ceramic matrix composite. J Braz. Soc. Mech. Sci. Eng. 44, 476 (2022). https://doi.org/10.1007/s40430-022-03782-7
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DOI: https://doi.org/10.1007/s40430-022-03782-7