J{sub IC} evaluation of the smooth and the side-grooved CT specimen in the reactor pressure vessel steel (SA508-3)

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:402993

Oh, S W; Lim, M B; Kim, T H ^[1]

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1. Dong-A Univ., Pusan (Korea, Republic of). Dept. of Mechanical Engineering

The elastic-plastic fracture toughness J{sub IC} of SA508-3 forging steel was investigated by using CT-type specimens. The thickness of the smooth specimen is B{sub 0} = 25.4 mm and the side groove specimen is B{sub N} = 20.4 mm and the side groove deep is S{center_dot}G = [(B{sub 0} {minus} B{sub N})/B{sub 0}] {times} 100 = 19.7% and the groove angle is 90{degree}. The J{sub IC} tests estimated according to the method proposed in the ASTM E813-81 and JSME S001-81. The side-grooved specimen have the advantage of J{sub IC} estimation, it is much easier to determine the onset of ductile tearing by the R-curve method and it improved accuracy and scatter of the toughness values thus determined, provided all the size-requirements for the specimen prescribed in the JSME method were satisfied. But it is difficult to find by the ASTM method. The critical stretched zone width (SZW{sub C}) of the side-grooved specimens found to be smaller than that previously determined for the standard CT specimens without side-grooves. This was attributed to higher triaxiality produced by the side-grooves. The stretched zone width method gave slightly larger J{sub IC} values than those by the R-curve method for SA508-3, as has been observed for the standard specimen without side-groove.

• OSTI ID: 402993
• Report Number(s): CONF-940473--; ISBN 1-880653-15-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
CRACK PROPAGATION
FRACTURE MECHANICS
FRACTURE PROPERTIES
MATERIALS TESTING
OFFSHORE PLATFORMS
STEELS
STRESS INTENSITY FACTORS