Characterization of material strain and thermal softening effects in the cutting process
Autor: | Dong Zhang, Xiao-Ming Zhang, Zheng-Yan Yang, Han Ding, Guang-Chao Nie |
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Rok vydání: | 2021 |
Předmět: |
0209 industrial biotechnology
Digital image correlation Materials science Strain (chemistry) Mechanical Engineering Process (computing) 02 engineering and technology Strain rate Industrial and Manufacturing Engineering Characterization (materials science) Rake angle 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Machining Shear zone Composite material |
Zdroj: | International Journal of Machine Tools and Manufacture. 160:103672 |
ISSN: | 0890-6955 |
Popis: | Accurate descriptions of workpiece behaviors are indispensable for achieving reliable simulations of the cutting process. However, the material plastic constitutive models obtained through conventional material tests do not apply in the ranges of strain and strain rate encountered in the realistic machining processes. To address this issue, in this study, we attempt to develop a methodology to understand and identify the plastic deformation behaviors based on high-speed filming and induction preheating during the cutting tests. Different levels of strain, strain rate, and temperature are realized by varying the rake angle, cutting velocity, and initial workpiece temperature, respectively. The plastic deformation and temperature rise in the primary shear zone are characterized by the fine-scale digital image correlation technique and heat convection–conduction equation, respectively, thus rendering the machining test into a high-dynamic-material testing method. The material exhibits strain softening in the primary shear zone and a reduced thermal softening effect under rapid heating conditions. These initial findings can deepen the understanding of material behaviors during the cutting process and can be further developed for implementation in numerical machining models. |
Databáze: | OpenAIRE |
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