Synonyms
See Definition: Extended Definition
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.
Extended Definition
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...
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References
Bai Y, Dodd B (1992) Adiabatic shear localization: occurrence, theories and applications. Pergamon Press, Oxford
Hou ZB, Komanduri R (1997) Modeling of thermomechanical shear instability in machining. Int J Mech Sci 39:1273–1314
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Semiatin SL, Rao SB (1983) Shear localization during metal cutting. Mater Sci Eng 61:185–192
Shaw MC (2004) Metal cutting principles, 2nd edn. Oxford University Press, Oxford, Chs. 9, 22
Tönshoff HK, Hollmann F (eds) (2005) Hochgeschwindigkeitsspanen Metallischer Werkstoffe (High speed metal cutting). Wiley-VCH, Weinheim
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Acknowledgments
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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Childs, T. (2014). Adiabatic Shearing in Metal Machining. In: Laperrière, L., Reinhart, G. (eds) CIRP Encyclopedia of Production Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20617-7_6392
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