Cryogenic fracture toughness determination of a structural alloy weldment by notch tensile measurement and finite element analysis

Y. Shindo, Y. Mano, K. Horiguchi, T. Sugo

研究成果: Article査読

9 被引用数 (Scopus)

抄録

This paper investigates the use of circumferentially notched bar specimens for the measurement of elastic-plastic fracture toughness (JIC) of structural alloys and weldments for superconducting magnets in fusion energy systems. Notch tensile tests were performed with small cylindrical notched bar specimens at liquid helium temperature (4 K) using crosshead rates of 0.2 mm/min and 20 mm/s. Test specimens were 5 mm in diameter with a 30-mm reduced section. In the mid-section of the specimen a 1 mm deep electro discharge machined (EDM) notch of 0.2 mm width was machined around the girth, thus maintaining a starting diameter of 3 mm. Correlations between notch tensile strength (σNTS), failure energy absorption (ENT), and JIC were assessed. The best data fit was found between the ratio σNTS/JIC and JIC. A finite element analysis was also performed to compute directly the J-values. Comparisons of the predicted JIC with results obtained from conventional JIS Z 2284 standard tests were made. Results of structural alloy weldment with a representatively wide range of JIC indicate that fracture toughness prediction accuracy is roughly equal to ±25 percent.

本文言語English
ページ(範囲)45-50
ページ数6
ジャーナルJournal of Engineering Materials and Technology, Transactions of the ASME
123
1
DOI
出版ステータスPublished - 2001 1月
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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