Tomoya Kawabata

TL;DR: In this article, the Weibull stress criterion is applied to correct the CTOD for constraint loss, which leads to an equivalent CTOD ratio, β, defined as β = δ/δWP, where δ and δWP are CTODs of the standard fracture toughness specimen and the structural component, respectively.

TL;DR: In this article, a new CTOD calculation method was investigated considering the variation of crack tip blunting due to strain hardening, and a new factor f was introduced to correct the plastic term.

TL;DR: In this paper, the effects of CTOD testing methodologies on CTOD values were investigated according to round robin tests conducted by the Japan Welding Engineering Society (WES).

TL;DR: A steel product usable at a low temperature, characterized in that it has a chemical composition, in mass %, of C: 0.01 to 0.1 %, Si: 0.,005 to 0.,6 %, Mn: 0,3 to 2 %, Ni: more than 6 % and less than 8 %, sol. Al: 0; 0.005, 0.0005, and the balance: Fe and impurities, with the following formula (1): 20C + 2.4Mn + Ni ≥ 10 ---- (1) is satisfied, it

TL;DR: In this paper, the authors used a high speed camera and strain gauge data with a high sampling rate to reveal the elementary process of brittle fracture in polycrystalline steel, and they revealed that the brittle crack propagation rate where the path includes crystal grain boundaries is much slower than the Rayleigh wave speed.