| Popis: |
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 LiNbO 3 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. |
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