Adiabatic Shearing in Metal Machining
See Definition: Extended Definition
Adiabatic shearing in metal machining is plastic straining to form a chip so quickly that the heat generated has no time to flow away. If the heating causes the metal to soften (overcoming the strain hardening), further straining may concentrate in the soft part so that it becomes even hotter and softer. Shearing becomes localized in a narrow band of increasingly hot metal.
Strain softening, shear localization, and shear banding are all associated with adiabatic shearing, but they are not synonyms as they can also occur, for other reasons, in isothermal conditions.
Shear localization or banding due to thermal softening does not require truly adiabatic (i.e., no heat flow) conditions. All that is required is a condition in which enough heating occurs. The term catastrophic thermal shear covers this. It focuses more on the observed behavior, less so on its cause. Catastrophic thermal shear leads to chips with a...
I wish to thank the following people for making available chip section pictures from their original work and allowing me to include them in this entry: J. Barry (Element Six), Figure 4; E. Uhlmann and R. Zettier (Technical University of Berlin), Figure 5; C.Z. Duan and L.C. Zhang (University of New South Wales), Figure 6; and C. Mueller (Technical University of Darmstadt), Figure 7. In addition, the sections in Figures 5 and 7 have appeared as parts of other figures in Chs. 18 and 15, respectively, of Tönshoff and Hollmann (2005).
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