A-23 破面形状計測に基づく作用応力推定法

概要

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There have been great needs to estimate the applied stress from fracture surface in addition to the fracture mode obtained from the evaluation by conventional fractography using SEM. In this study, several estimation procedures for the applied stress were investigated by quantitative analysis of the fracture surface topography measured by a confocal-optics-based scanning laser microscope or an atomic force microscope. For fatigue crack of carbon steel, a good correlation was obtained between the stress intensity factor (ΔK) and roughness parameter derived from the analysis of fracture surface. For cast iron, it was possible to estimate the fracture mode and the applied fatigue stress. Finally, the shape of striation in Al alloy and SUS304 were examined. And a correlation between the stress ratio (R) and the ratio of striation height to width was clarified.
一般社団法人日本機械学会の論文
2000-03-29