ZrO2陶瓷切向超声辅助磨削表面及亚表面损伤机制

闫艳燕; 张亚飞; 张兆顷

doi:10.7527/S1000-6893.2020.24749

航空学报 >

2021 , Vol. 42 >Issue 7: 624749 - 624749

DOI: https://doi.org/10.7527/S1000-6893.2020.24749

先进制造技术与装备专栏

ZrO₂陶瓷切向超声辅助磨削表面及亚表面损伤机制

闫艳燕 ,
张亚飞 ,
张兆顷

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河南理工大学机械与动力工程学院, 焦作 454003

收稿日期: 2020-09-14

修回日期: 2020-10-09

网络出版日期: 2020-12-14

基金资助

国家自然科学基金（51575163）

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Surface and subsurface damage mechanisms in tangential ultrasonic-assisted grinding of ZrO₂ ceramics

YAN Yanyan ,
ZHANG Yafei ,
ZHANG Zhaoqing

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School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Received date: 2020-09-14

Revised date: 2020-10-09

Online published: 2020-12-14

Supported by

National Natural Science Foundation of China (51575163)

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摘要

为进一步揭示切向超声辅助磨削过程中硬脆材料的表面及亚表面损伤机理，基于应变率模型对其磨削过程中材料的动态力学性能进行分析，并在此基础上建立了硬脆材料的脆-塑转变临界切削深度模型与微裂纹损伤深度模型。研究发现，脆-塑转变临界切削深度和微裂纹损伤深度均与应变率有关，其中临界切削深度随着应变率的增加而增加，而横向裂纹损伤深度与中位裂纹损伤深度均随应变率的增加而减小。通过ZrO₂陶瓷切向超声辅助磨削试验进行验证。试验结果表明：由于切向超声振动的引入提高了材料应变率，进而提高了材料的动态断裂应力以及动态断裂韧性，从而扩大了ZrO₂陶瓷的塑性域去除范围，降低了加工表面的横向裂纹与中位裂纹损伤深度，使得ZrO₂陶瓷的表面及亚表面质量得到明显改善。试验结果与理论分析相一致，为进一步揭示切向超声辅助磨削过程中硬脆材料的表面及亚表面微观损伤机理提供了理论参考。

关键词： 切向超声辅助磨削; 应变率; 脆-塑转变临界切削深度; 表面损伤; 亚表面损伤

本文引用格式

闫艳燕 , 张亚飞 , 张兆顷 . ZrO₂陶瓷切向超声辅助磨削表面及亚表面损伤机制[J]. 航空学报, 2021 , 42(7) : 624749 -624749 . DOI: 10.7527/S1000-6893.2020.24749

Abstract

To further reveal the surface damage and subsurface damage mechanisms of hard-brittle materials in Tangential Ultrasonic-Assisted Grinding (TUAG), the dynamic mechanical properties of the hard-brittle materials during TUAG are analyzed based on the strain rate model. On this basis, the brittle-ductile transition’s critical cutting depth and the crack depth for hard-brittle materials in TUAG are obtained. The study found that the critical cutting depth and the crack depth are related to the strain rate. The critical cutting depth increases with the increase of the strain rate, and both the transverse crack depth and the median crack depth decrease with the increase of strain rate. Grinding test of ZrO₂ ceramics was conducted to verify the theoretical analysis. The test results show that due to the introduction of tangential ultrasonic vibration,the strain rate of the material increases, which then improves the dynamic fracture stress and dynamic fracture toughness of the material. As a result, the plastic removal range of ZrO₂ ceramics was increased, the depth of transverse crack and mediate crack were reduced, and the surface and subsurface quality of ZrO₂ ceramics was significantly improved. The test results are consistent with the theoretical analysis. This study provides a theoretical reference for further revelation of the surface and subsurface damage mechanisms of hard-brittle materials in TUAG.

Key words： Tangential Ultrasonic-Assisted Grinding (TUAG); strain rate; brittle-ductile transition’s critical cutting depth; surface damage; subsurface damage

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