Estimation Of Cyclic Plastic Deformation
Behaviours By The Micro-indentation Method
Author(s)
H. Sakamoto, Y. Ohbuchi & Y. Nakamura
Abstract
The change of mechanical properties under cyclic loading was measured and the
cyclic hardening/softening phenomena at the early stage of fatigue around the
crack tip were made clear by the Micro-Indentation Method. The effects of the
stress concentration, the strain amplitudes and the number of cycles on the
dynamic micro hardness of the material surface were examined in detail. The
cyclic local plastic behaviours agree well with the change of surface micro
dynamic hardness and it is shown that this Micro-Indentation Method is effective
as the evaluation method of mechanical properties under cyclic loading.
Keywords: plastic behaviour, micro-indentation, cyclic loading, plastic
hardening, low cycle fatigue.
1 Introduction
Recently, as the evaluation method of the mechanical properties of surface
treatment material and thin film, the Micro-Indentation Tester has received
attention from micro-electron manufacturing industries [1–4]. The change of
material properties under cyclic loading plays an important role in the fatigue
process. In this study, the change of material properties, that is, the cyclic
hardening/softening phenomenon at the early stage of fatigue around the crack
tip, was measured by a Micro Indentation Tester [5]. The effects of the stress
concentration, the strain amplitudes and the number of cycles on the surface
micro hardness were examined. The conventional method of micro Vickers
hardness demands the measurement of the diagonal length of indentation and a
lot of time is required for this measurement.
Keywords
plastic behaviour, micro-indentation, cyclic loading, plastic
hardening, low cycle fatigue
Related Book
Other papers in this volume
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