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.
Highlights
Hardened steel is a material commonly used for manufacturing panel dies on automobiles.The processing surface of hardened steel die after high-speed milling basically reflects its surface state in its final form, and its processed surface state directly influences the die life span [1]
For the quadrilateral biomimetic form, when the long side of the quadrilateral was parallel to the load line, the fatigue life of the model increased with the decreasing ratio of row spacing to feed rate
From the curve of fatigue life of the five models in Figure 16b, we found that fatigue life decreased with increasing milling depth
Summary
Hardened steel is a material commonly used for manufacturing panel dies on automobiles. The bionic non-smooth coupling treatment significantly improves the surface hardness, wear resistance and thermal fatigue performance of the mold. Based on the literature review, most researchers have focused on the thermal fatigue resistance of dies and their biomimetic strengthening treatment on the mold surface based on different bionic forms using laser melting technology to improve the thermal fatigue resistance and die lifespan. By bionic manufacturing which influence the development and manufacturing of Inspired automobile panel organisms with non-smooth surfaces on typical organism bodies like dung beetles and dies. Inspired bybiomimetic bionic organisms with biomimetic non-smooth surfaces on typical organism bodies desert vipers, in and this desert study,vipers, we used the study, hardened steel the pitting style steel biomimetic function surface like dung beetles in this we used hardened pitting style biomimetic producedsurface by high-speed milling technology milling (Figure 1). (b)biomimetic biomimeticform formof of quadrilateral quadrilateral pit pit after after high-speed quadrilateral pitpit onon dung beetle milling; (c) biomimetic design on abdomen of desert viper; (d) biomimetic form of hexagonal pit after high-speed milling
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