Brittle-Ductile Transition Phenomena in Microindentation and Micromachining

A generalized hypothesis for the brittle to ductile transition in micromachining and microindentation of brittle materials is proposed. By the hypothesis, complicated transition phenomena observed in practical machining processes are well explained. Experimental results on microturning, ELID grindin...

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Bibliographic Details
Published inCIRP annals Vol. 44; no. 1; pp. 523 - 526
Main Authors Shimada, Shoichi, Ikawa, Naoya, Inamura, Toyoshiro, Takezawa, Nobuhiro, Ohmori, Hitoshi, Sata, Toshio
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 1995
Elsevier
Subjects
Applied sciences
Brittle material
Ductile transition
Exact sciences and technology
Mechanical engineering. Machine design
Micro Machining
Precision engineering, watch making
Ductile transition
Micro Machining
Brittle material
Ductile brittle transition
Microstructure
Indentation
Precision engineering
Machining
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Summary:A generalized hypothesis for the brittle to ductile transition in micromachining and microindentation of brittle materials is proposed. By the hypothesis, complicated transition phenomena observed in practical machining processes are well explained. Experimental results on microturning, ELID grinding of monocrystalline Si and LiNbO3 support the applicability of the hypothesis. Microindentation testing is shown to evaluate the intrinsic ductility and critical scale of machining for ductile mode machining. To analyze the machining process in extremely small scale, molecular dynamics computer simulations of microindentation and cutting are made on a defect-free surface. These results suggest that any material, in spite of their ductility, can be machined in ductile mode under the sufficiently small scale of machining.
ISSN:0007-8506
DOI:10.1016/S0007-8506(07)62377-4