The use of finite element analysis and notch tensile testing to determine the cryogenic fracture toughness of thick section weldment in forged CSUS-JN1 plate with Inconel 625 type filler metals
Y. Shindo et al., The use of finite element analysis and notch tensile testing to determine the cryogenic fracture toughness of thick section weldment in forged CSUS-JN1 plate with Inconel 625 type filler metals, J JPN METAL, 64(1), 2000, pp. 56-61
The use of the notch tensile test to estimate the elastic-plastic fracture
toughness (J(IC)) of structural alloys and weldments for superconducting ma
gnets in fusion energy systems was studied. Notch tensile tests were perfor
med with small round bar specimens containing an electro discharge machined
(EDM) notch at liquid helium temperature (4 K) using crosshead rates of 3.
3 x 10(-3) and 20 mm/s. Notch tensile test specimens were 5 mm in diameter
with a 30-mm reduced section. In the mid section of the specimen a 1 mm dee
p 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,
failuar energy absorption, and J(IC) were assessed, A finite element analys
is was also performed to compute directly the J-values. Comparisons of the
predicted J(IC) with results obtained from conventional JIS Z 2284 standard
tests were made.