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Full Length Article | Open Access

Fiber orientation effects on grinding characteristics and removal mechanism of 2.5D Cf/SiC composites

Cheng CAOa, Qinghua SONGa,b,( ), Hui FUa, Hansong JIa, Zhanqiang LIUa,b, Liping JIANGa,c
Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China
National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, China
Shandong Industrial Ceramic Research & Design Institute, Zibo 255020, China

Peer review under responsibility of Editorial Committee of CJA.

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Abstract

Carbon fiber reinforced silicon carbide (Cf/SiC) composites are widely used in aerospace for their excellent mechanical properties. However, the quality of the machined surface is poor and unpredictable due to the material heterogeneity induced by complex removal mechanism. To clarify the effects of fiber orientation on the grinding characteristics and removal mechanism, single grit scratch experiments under different fiber orientations are conducted and a three-phase numerical modelling method for 2.5D Cf/SiC composites is proposed. Three fiber cutting modes i.e., transverse, normal and longitudinal, are defined by fiber orientation and three machining directions i.e., MA (longitudinal and normal), MB (longitudinal and transverse) and MC (normal and transverse), are selected to investigate the effect of fiber orientation on grinding force and micro-morphology. Besides, a three-phase cutting model of 2.5D Cf/SiC composites considering the mechanical properties of the matrix, fiber and interface is developed. Corresponding simulations are performed to reveal the micro-mechanism of crack initiation and extension as well as the material removal mechanism under different fiber orientations. The results indicate that the scratching forces fluctuate periodically, and the order of mean forces is MA > MC > MB. Cracks tend to grow along the fiber axis, which results in the largest damage layer for transverse fibers and the smallest for longitudinal fibers. The removal modes of transverse fibers are worn, fracture and peel-off, in which normal fibers are pullout and outcrop and the longitudinal fibers are worn and push-off. Under the stable cutting condition, the change of contact area between fiber and grit leads to different removal modes of fiber in the same cutting mode, and the increase of contact area results in the aggravation of fiber fracture.

Keywords

Material removal mechanismNumerical modellingSurface morphology2.5D Cf/SiC compositesSingle grit scratch experiments

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Chinese Journal of Aeronautics
Volume 36 Issue 12,
December 2023
Pages 425-441
DOI: 10.1016/j.cja.2023.02.023
Cite this article:
CAO C, SONG Q, FU H, et al. Fiber orientation effects on grinding characteristics and removal mechanism of 2.5D Cf/SiC composites. Chinese Journal of Aeronautics, 2023, 36(12): 425-441. https://doi.org/10.1016/j.cja.2023.02.023

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Received: 29 November 2022
Revised: 12 December 2022
Accepted: 17 January 2023
Published: 23 February 2023
© 2023 Chinese Society of Aeronautics and Astronautics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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