鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
力学特性
自動その場観察システムと画像相関法を用いた微視組織的微小疲労き裂発生および進展評価法の開発
西川 嗣彬古谷 佳之
著者情報
ジャーナル フリー HTML

2019 年 105 巻 1 号 p. 105-111

詳細
抄録

We constructed an automatic in situ fatigue observation system to monitor small fatigue crack behavior at the microstructural level. Applying a digital image correlation (DIC) technique in combination enabled us to continuously and automatically track and record microscopic deformation behavior. To verify the effectiveness of this system, we applied it to small fatigue crack evaluation in heat-treated low-carbon steel. The results demonstrated the feasibility, using our developed system, of automatically tracking and recording microstructurally small fatigue crack initiation and early growth behavior. By utilizing DIC analysis, we also succeeded in visualizing microscopic deformations such as inhomogeneous strain concentration by microstructures causing fatigue cracks and small fatigue crack opening-closing behavior. Although early stage fatigue crack growth rate accelerated compared to long crack data, it was consistent with long crack data by using ΔKeff calculated from crack open stress measured by DIC.

著者関連情報
© 2019 一般社団法人 日本鉄鋼協会
前の記事 次の記事
feedback
Top