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- 학술대회자료
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- 발행연도
- 2021.6
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- 31 - 31 (1page)
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Crystal surfaces are commonly coated with natural oxides or other materials for engineering applications to provide reliability and durability under conditions of increased working speeds and loads, aggressive medium attacks and elevated temperatures.<sup>(1)</sup> Recently, Kiely et al.<sup>(2)</sup> showed that the inevitable nanoscale defects and asperities on the surfaces can be treated as surface steps, which affect significantly the initial yield through dislocation formation under nanoindentation. However, the previous studies, including both experiments<sup>(2)</sup> and simulations,<sup>(3-4)</sup> have considered mainly the surface asperities or surface steps in pristine materials under contact loading; while the effects of those nanoscale asperities on heterogeneous surface layers, which becomes ubiquitous for a variety of technological reasons, are not yet investigated.
In this study, the indentation problem with adhesive contact of a surface step on a coating on a substrate was examined, to investigate the effect of the nanoscale asperities of the coating layer on the dislocation emission, which is responsible for the surface microplasticity evolution. Continuum anisotropic elasticity was used to model the a ... 전체 초록 보기
In this study, the indentation problem with adhesive contact of a surface step on a coating on a substrate was examined, to investigate the effect of the nanoscale asperities of the coating layer on the dislocation emission, which is responsible for the surface microplasticity evolution. Continuum anisotropic elasticity was used to model the a ... 전체 초록 보기
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