Effect of Fiber Orientation on Grinding Characteristics and Removal Mechanisms of Cf/SiC

Runxian Luo; Ruizhi Hu

doi:10.63313/AERpc.9019

Authors

Runxian Luo School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China. Author
Ruizhi Hu School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China. Author

DOI:

https://doi.org/10.63313/AERpc.9019

Keywords:

Cf/SiC composites, Single-grit scratching experiment, Finite element analysis

Abstract

Carbon fiber-reinforced silicon carbide ceramic matrix composites (Cf/SiC) ex-hibit advantages such as high-temperature resistance, low density, and high spe-cific strength, making them widely applicable in aerospace, new energy vehicles, and other fields. However, their heterogeneous nature and hard-brittle fracture mechanisms lead to poor machined surface quality. To clarify the influence of fiber orientation on grinding characteristics and material removal mechanisms, single-grit scratching experiments were conducted, and a finite element model (FEM) of Cf/SiC composites was established. Two machining directions, MA (transverse direction) and MB (longitudinal direction), were defined based on fiber orientation, and the effects on normal force (Fn) and surface morphology were investigated. A finite element numerical model of Cf/SiC composites was developed, incorporating the mechanical properties of fibers, matrix, and inter-faces. Simulation results revealed that Fn increases with cutting depth, and the average Fn magnitude followed the order MB > MA. Cracks propagated along the fiber axis: transverse fibers were removed via wear, fracture, and peeling, with some fibers exposed due to brittle matrix fracture; longitudinal fibers were re-moved via wear and debonding, primarily influenced by the contact area be-tween fibers and abrasive grits.

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