Material removal mechanisms during micro-hole drilling of UD-Cf/SiC composites: A study via nano-scratch and drilling tests

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-09-13 DOI:10.1016/j.compositesb.2025.113031

Haotian Yang , Guolong Zhao , Feng Jiang , Li Zhu , Zhiwen Nian , Liang Li

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引用次数: 0

Abstract

Carbon fiber-reinforced ceramic matrix composites (C_f/SiCs) are widely used in aerospace due to their exceptional strength-to-weight ratio. However, their high hardness and anisotropy often lead to rapid tool wear and poor drilling performance. To investigate their fracture behavior, nano scratch was conducted on unidirectional carbon fiber-reinforced SiC composites (UD-C_f/SiCs). The ductile-brittle transition depths of carbon fibers in the radial, axial, and end-face directions were 907.2 nm, 961.3 nm, and 455.6 nm, respectively. Meanwhile, the micro-macro brittle transition depths were 3013.4 nm, 2759.4 nm, and 5101.2 nm, respectively. Furthermore, drilling tests were conducted on UD-C_f/SiCs to produce 600 μm diameter holes using parallel drilling (PD) and vertical drilling (VD) processes. The thrust force in the VD process was higher than in the PD process at a feed rate (f) of 0.3 μm/r, nearly equal at f of 0.9 μm/r, and lower at f of 1.8 μm/r. The PD process caused less exit damage than the VD process at 0.3–1.5 μm/r but more at 1.8 μm/r. With increasing f, the carbon fibers gradually transitioned from ductile fracture to micro- and macro-brittle fracture. The primary removal mechanisms of the carbon fibers involved compression, shear, and bending fracture. Hole-wall with longitudinal fibers exhibited the best integrity (R_a increasing from 0.3940 μm to 1.1110 μm), whereas perpendicular and transverse bundles deteriorated more severely (R_a reaching up to 1.6991 μm–3.7058 μm). Notably, the most severe subsurface damage occurred in holes with perpendicularly oriented fibers, reaching a depth of approximately 6.93 μm.

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UD-Cf/SiC复合材料微孔钻削过程中材料去除机制：纳米划痕和钻削试验研究

碳纤维增强陶瓷基复合材料（Cf/ sic）由于其优异的强度重量比而广泛应用于航空航天领域。然而，它们的高硬度和各向异性往往导致刀具磨损快，钻井性能差。为了研究其断裂行为，对单向碳纤维增强SiC复合材料（UD-Cf/SiC）进行了纳米划伤处理。碳纤维在径向、轴向和端面的韧脆转变深度分别为907.2 nm、961.3 nm和455.6 nm。微宏观脆性转变深度分别为3013.4 nm、2759.4 nm和5101.2 nm。此外，采用平行钻孔（PD）和垂直钻孔（VD）工艺，在UD-Cf/ sic上进行了直径600 μm的钻孔试验。在进给量f为0.3 μm/r时，VD工艺的推力大于PD工艺，在进给量f为0.9 μm/r时推力基本相等，在进给量f为1.8 μm/r时推力较低。在0.3 ~ 1.5 μm/r范围内，PD工艺的出口损伤比VD工艺小，而在1.8 μm/r范围内，PD工艺的出口损伤比VD工艺大。随着f的增大，碳纤维从韧性断裂逐渐过渡到微脆性断裂和宏观脆性断裂。碳纤维的主要去除机制包括压缩、剪切和弯曲断裂。纵向纤维的孔壁完整性最好（Ra从0.3940 μm增加到1.1110 μm），而垂直和横向纤维的孔壁恶化更严重（Ra达到1.6991 μm - 3.7058 μm）。值得注意的是，垂直取向的纤维孔的亚表面损伤最为严重，深度约为6.93 μm。

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.