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Updated: Dec 21, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
Near-threshold fatigue crack propagation without oxide-induced crack closure
Koki Tazoe1, Hiroto Tanaka2, Masanori Oka2
1Research and Development Center, YANMAR HOLDINGS CO., LTD., 2481, Umegahara, Maibara, Shiga, 521-8511, Japan. koki_tazoe@yanmar.com.
Abstract:
An accurate value for the threshold stress intensity factor range, ΔKth, is a key parameter for studying crack-like defects. However, it is difficult to obtain accurate ΔKth values due to oxide-induced crack closure. In this study, we report conditions for minimizing the effects of oxide-induced crack closure near the threshold region, where a concave curve of the effect on the loading frequency on oxide-induced crack closure is achieved. The resulting conditions allow for an accurate determination of ΔKth, which is a key material parameter relating to the pertinent loading ratio.
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