基于动态压痕的RB-SiC陶瓷裂纹生成-扩展及材料去除机理研究

doi:10.3901/JME.2025.13.449

机械工程学报 ›› 2025, Vol. 61 ›› Issue (13): 449-460.doi: 10.3901/JME.2025.13.449

• 制造工艺与装备 • 上一篇

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基于动态压痕的RB-SiC陶瓷裂纹生成-扩展及材料去除机理研究

刘立飞¹, 梁奉爽², 吴明阳², 张明德¹

1. 重庆理工大学机械工程学院重庆 400054;
2. 哈尔滨理工大学机械动力工程学院哈尔滨 150080

收稿日期:2024-12-06 修回日期:2025-03-05 发布日期:2025-08-09
作者简介:刘立飞(通信作者)，男，1987年出生，博士，副教授，硕士研究生导师。主要研究方向为硬脆材料精密超精密铣磨加工技术、复杂曲面精密铣磨成型损伤控制技术、超硬磨料砂轮磨损检测及修整技术。E-mail：liulf_87@163.com;梁奉爽，男，1997年出生，硕士研究生。主要研究方向为超声振动辅助磨削加工。E-mail：1197767106@qq.com;吴明阳，男，1971年出生，博士，教授，博士研究生导师。主要研究方向为超精密与特种加工技术、难加工材料高效加工技术、难加工材料切削理论及刀具技术。E-mail：13936161878@139.com;张明德，男，1975年出生，博士，教授，硕士研究生导师。主要研究方向为数字化与智能制造技术。;Email：zmd@cqut.edu.cn
基金资助:
重庆市自然科学基金面上(2023CCZ022)、重庆市教委科学技术研究计划青年(2023CJZ023)、重庆市教委科学技术研究计划重大(2023CJZ001)、重庆理工大学科研启动金(01192200551)和国家自然科学基金(51705111)资助项目。

Study on the Damage Formation Mechanism of RB-SiC Ceramics Based on Dynamic Indentation

LIU Lifei¹, LIANG Fengshuang², WU Mingyang², ZHANG Mingde¹

1. College of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054;
2. School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080

Received:2024-12-06 Revised:2025-03-05 Published:2025-08-09

摘要/Abstract

摘要： 当前，高应变率条件下的SiC陶瓷动态力学性能及其对裂纹生成-扩展规律和材料去除机理的影响机制尚不明确。因此，针对上述机理性研究不足，基于改进的霍普金森压杆装置开展了RB-SiC陶瓷准静态和动态压痕试验研究。结果表明，随着压痕载荷从0.98 N增加到9.8 N，RB-SiC陶瓷的准静态和动态硬度均表现出压痕尺寸效应，且动态硬度高于准静态硬度，材料准静态断裂韧性值逐渐增大，动态断裂韧性值逐渐减小且小于准静态断裂韧性值。相比准静态压痕，动态压痕区材料破碎加剧，棱边裂纹萌生并随载荷增加迅速扩展，直至与对角线裂纹连接形成环状闭合裂纹，导致材料发生剥落去除和块状破碎去除。动态压痕亚表面裂纹倾向于以大量微裂纹形式在压痕区局部扩展，因此，亚表面裂纹以横向裂纹为主，只有少量裂纹沿纵向扩展，亚表面损伤层深度降低。基于研究成果，建立了RB-SiC陶瓷动态压痕裂纹模型，为从物理本质上揭示SiC陶瓷高应变率下的磨削去除机理提供实践借鉴。

关键词: RB-SiC陶瓷, 动态压痕, 应变率效应, 裂纹生成-扩展机制, 材料去除机理

Abstract: The dynamic mechanical properties of SiC ceramics under high strain rate conditions, as well as their influence mechanisms on crack initiation-propagation behavior and material removal mechanisms, remain unclear. Therefore, in view of the lack of research on the above mechanism, the quasi-static and dynamic indentation tests of RB-SiC ceramics were carried out based on the modified split Hopkinson pressure bar (SHPB) system. The results show that with the increase of indentation load from 0.98 N to 9.8 N, the quasi-static and dynamic hardness of RB-SiC ceramics show indentation size effect, and the dynamic hardness is higher than the static hardness. The quasi-static fracture toughness of the material increases gradually, and the dynamic fracture toughness decreases gradually and is less than the quasi-static fracture toughness. Compared with the quasi-static indentation, the material crushing in the dynamic indentation area is intensified, and the edge cracks initiate and expand rapidly with the increase of load until they are connected with the diagonal cracks to form a closed annular crack, resulting in the spalling removal and block crushing removal of the material. The dynamic indentation subsurface cracks tend to propagate locally in the indentation area in the form of a large number of microcracks. Therefore, the subsurface cracks are mainly transverse cracks, only a small number of cracks propagate along the longitudinal direction, and the depth of the subsurface damage layer is reduced. Based on the research results, the dynamic indentation crack model of RB-SiC ceramics is established, which provides practical reference for revealing the grinding removal mechanism of SiC ceramics at high strain rate from the physical essence.

Key words: RB-SiC ceramics, dynamic indentation, strain rate effect, crack generation-propagation mechanism, material removal mechanism

中图分类号:

TG156

刘立飞, 梁奉爽, 吴明阳, 张明德. 基于动态压痕的RB-SiC陶瓷裂纹生成-扩展及材料去除机理研究[J]. 机械工程学报, 2025, 61(13): 449-460.

LIU Lifei, LIANG Fengshuang, WU Mingyang, ZHANG Mingde. Study on the Damage Formation Mechanism of RB-SiC Ceramics Based on Dynamic Indentation[J]. Journal of Mechanical Engineering, 2025, 61(13): 449-460.

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基于动态压痕的RB-SiC陶瓷裂纹生成-扩展及材料去除机理研究

Study on the Damage Formation Mechanism of RB-SiC Ceramics Based on Dynamic Indentation

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