基于不同纤维取向的正交编织SiCf/SiC复合材料纵向扭转超声振动辅助磨削表面损伤特征

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-10-09 DOI:10.1016/j.tws.2025.114066

Qixuan Sun , Zhen Yin , Qinglong An , Zehui Liang , Qing Miao , Chenwei Dai , Ming Zhang , Hua Li , Chenwei Shan

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引用次数: 0

摘要

由于其优异的性能，包括耐高温、耐腐蚀和低密度，SiCf/SiC复合材料已成为航空发动机热截面部件的有前途的候选材料。然而，其特殊的硬度、固有的脆性和各向异性结构使其极易受到严重的加工损伤。为了解决这一问题，对SiCf/SiC复合材料进行了纵向扭转超声振动辅助磨削（LTUAG）和常规磨削（CG）的对比实验。根据磨削方向和纤维取向对纤维表面损伤进行了定量表征。利用纤维拔出长度、边缘切屑因子和三维表面粗糙度（Sa）综合评价SiCf/SiC复合材料的表面损伤行为，探索LTUAG过程中抑制表面损伤的方法。结果表明：LTUAG提高了磨粒速度，增强了瞬时冲击力，从而减少了纤维断裂和拉出长度；超声振动可以促进材料的微脆性断裂，减少纤维脱粘现象。当磨削方向与纤维方向平行时，纵向振幅为8 μm时，纤维横向拔出长度最短，表面损伤最小；当磨削方向垂直于纤维取向时，10 μm的纵向振幅更有效地抑制了纵向纤维的边缘切削损伤。当磨削方向与纤维取向成锐角时，表面损伤和表面粗糙度显著降低。沿纤维横向方向磨削的损伤抑制效果最佳，表面粗糙度Sa值最小为2.54 μm。

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Surface damage characterisation of longitudinal torsional ultrasonic vibration-assisted grinding of orthogonally woven SiCf/SiC composites based on different fibre orientation

Owing to their exceptional properties, including high-temperature resistance, corrosion resistance, and low density, SiC_f/SiC composites have emerged as promising candidate materials for hot-section components in aeroengines. However, their exceptional hardness, inherent brittleness, and anisotropic structure make them highly susceptible to severe machining-induced damage. To address this issue, comparison experiments between longitudinal torsional ultrasonic vibration-assisted grinding (LTUAG) and conventional grinding (CG) comparison experiments were performed on SiC_f/SiC composites. Quantitative characterisation of fibre surface damage was performed with respect to grinding direction and fibre orientation. Fibre pull-out length, edge chipping factor, and three-dimensional surface roughness (Sa) were used to comprehensively evaluate the surface damage behaviour of SiC_f/SiC composites and to explore methods for surface damage suppressing during LTUAG. The results showed that LTUAG increased grain grinding speed and enhanced instantaneous impact force, thereby reducing fibre fracture and pull-out length. Moreover, ultrasonic vibration can promote micro-brittle fracture of the material and reduce the phenomenon of fibre debonding. When the grinding direction was parallel to fibre orientation, a longitudinal amplitude of 8 μm produced the shortest transversal fibre pull-out length and minimal surface damage. When the grinding direction was perpendicular to the fibre orientation, a larger longitudinal amplitude of 10 μm more effectively suppressed edge chipping damage of longitudinal fibres. When the grinding direction formed an acute angle with fibre orientation, surface damage and surface roughness were markedly reduced. Grinding along the transversal fibre direction provided optimal damage suppression, achieving a minimum surface roughness Sa value of 2.54 μm.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.