SEDL / STP / STP782-EB / STP34366S

A Single Specimen Method for Determining Upper Shelf Fracture Toughness Shifts Using Precracked Charpy Specimens

Pavinich, WA
Babcock & Wilcox Company, Lynchburg, Virginia

Futato, RJ
Babcock & Wilcox Company, Alliance, Ohio

Neale, BK
Central Electricity Generating Board, Berkeley Nuclear Laboratories, Berkeley,

Lowe, AL
Babcock & Wilcox Company, Lynchburg, Virginia

Van Der Sluys, WA
Babcock & Wilcox Company, Alliance, Ohio

Pages: 19    Published: Jan 1982

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Abstract

A joint program between Babcock & Wilcox (B&W) and the Central Electricity Generating Board (CEGB) was undertaken to develop a three-point bend procedure for generating J¹-R curves from irradiated and unirradiated Charpy specimens.

Precracked Charpy specimens provided by the CEGB were tested to verify similarity of room temperature single and multiple specimen tests. Close agreement between critical J values and tearing moduli was found. Several single specimen tests were carried out at temperatures between 20C and 350C to verify elevated temperature test performance. Upper shelf behavior was observed in all these tests. Measured crack lengths were usually within .125 mm of calculated crack lengths.

J¹-R curves generated from precracked Charpy specimens were compared with J¹-R curves of 1T and 0.5T compact fracture specimens. Results were similar provided that side-grooving depths of the Charpy specimens did not exceed 10% of specimen thickness.