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

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume123
Issue number1
DOIs
Publication statusPublished - 2001 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Cryogenic fracture toughness determination of a structural alloy weldment by notch tensile measurement and finite element analysis'. Together they form a unique fingerprint.

  • Cite this