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硬化钢仿生功能表面疲劳特性研究

Study on Fatigue Characteristics of Bionic Functional Surface of Hardened Steel.

作者信息

Cui Youzheng, Zheng Minli, Zhang Wei, Wang Ben, Sun Yonglei, Wang Weiran

机构信息

Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China.

School of Mechanical and Electronic Engineering, Qiqihar University, Qiqihar 161006, China.

出版信息

Materials (Basel). 2020 Sep 17;13(18):4130. doi: 10.3390/ma13184130.

DOI:10.3390/ma13184130
PMID:32957520
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7560293/
Abstract

In this study, we aimed to process the biomimetic function surface by designing a prototype for modeling the pits on a dung beetle body and the abdomen of a desert viper, and by using high speed milling and controlling the ratio of row spacing to feed rate. Firstly, we conducted three-dimensional parametric modeling and static analysis of the bionic functional surface using 3D modeling software UGNX (12.0, SIEMENS AG, Munich, Germany) and finite element analysis software ABAQUS (2018, Dassault, Providence, RI, USA). Then, the analysis results were imported into the fatigue life analysis software nCode (2018, HBM United Kingdom Ltd., South Yorkshire, UK) to simulate the fatigue characteristics of different bionic pit morphology models. Per the simulated tensile fatigue testing machine, the result shows that the minimum fatigue life value of the quadrilateral pit surface of the simulated dung beetle is one and four times higher than the hexagonal pit morphology and the irregular pit morphology, respectively, whereas the maximum fatigue damage is lower by one and five orders of magnitude, respectively. The quadrilateral pit surface on the biomimetic dung beetle body has better fatigue resistance, which can considerably improve the fatigue damage distribution state and the fatigue life of hardened steel die surfaces. The influential regulation of milling parameters on fatigue performance was studied and the results show that the fatigue resistance of the model is optimal when milling parameters are: row spacing of 0.4 mm, loading space of 0.2 mm, and milling depth of 0.3 mm. The quadrilateral dimensions formed by milling are highly similar to those of a dung beetle body proving that a certain reduction in milling process depth can increase the structural fatigue resistance. From the perspective of fatigue crack growth analysis, the quadrilateral dimples on the surface of the dung beetle improve fatigue crack growth inhibition and fatigue resistance.

摘要

在本研究中，我们旨在通过设计一个原型来模拟蜣螂身体和沙漠蝰蛇腹部的凹坑，并利用高速铣削和控制行距与进给速度的比例来加工仿生功能表面。首先，我们使用3D建模软件UGNX（12.0，西门子股份公司，德国慕尼黑）和有限元分析软件ABAQUS（2018，达索系统公司，美国罗德岛州普罗维登斯）对仿生功能表面进行三维参数建模和静态分析。然后，将分析结果导入疲劳寿命分析软件nCode（2018，HBM英国有限公司，英国南约克郡），以模拟不同仿生凹坑形态模型的疲劳特性。根据模拟拉伸疲劳试验机的结果，模拟蜣螂四边形凹坑表面的最小疲劳寿命值分别比六边形凹坑形态和不规则凹坑形态高1倍和4倍，而最大疲劳损伤分别低1个和5个数量级。仿生蜣螂身体上的四边形凹坑表面具有更好的抗疲劳性能，这可以显著改善硬化钢模具表面的疲劳损伤分布状态和疲劳寿命。研究了铣削参数对疲劳性能的影响规律，结果表明，当铣削参数为：行距0.4mm、加载间距0.2mm、铣削深度0.3mm时，模型的抗疲劳性能最佳。铣削形成的四边形尺寸与蜣螂身体的尺寸高度相似，证明铣削过程深度的一定减小可以提高结构的抗疲劳性能。从疲劳裂纹扩展分析的角度来看，蜣螂表面的四边形凹坑改善了疲劳裂纹扩展抑制和抗疲劳性能。

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