SYMPOSIA PAPER Published: 01 January 1977
STP35556S

Dynamic Fracture Toughness of SA533 Grade A Class 2 Base Plate and Weldments

Source

Dynamic fracture toughness tests were performed on four base plate heats and six weldments of SA533 Gr A Cl 2 pressure vessel steel. Linear elastic KId results were obtained at low temperatures while J-integral techniques were utilized to evaluate dynamic toughness over the transition and upper shelf temperature ranges. Loading rates in terms of ˙K were on the order of 2 to 4 × 104 ksi ins(2.2to4.4×104MPams). Charpy and drop weight nil-ductility transition (NDT) tests were performed to permit a comparison of toughness results with the American Society of Mechanical Engineers (ASME) code reference toughness KIR curve. Dynamic instrumented precracked Charpy tests on base plate material were included for a comparison with compact toughness (CT) specimen results. All dynamic fracture-toughness values of SA533 Gr A Cl 2 base, weld, and heat affected zone (HAZ) material exceeded the ASME code reference toughness KIR curve. Fracture-toughness values obtained via small specimen dynamic JId tests (1.0 in. (2.5 cm) thick CT specimens) compared well with previously developed large specimen KId values. Dynamic instrumented precracked Charpy toughness values were also comparable at low temperatures but failed to meet minimum J specimen size limitations midway into the transition-temperature range. At this point, Charpy toughness values increased dramatically compared to JId results meeting a 25 JIdf size criterion and, thus, should not be considered a valid representation of fracture toughness. True upper shelf dynamic fracture-toughness results are also presented. The point of crack initiation (which provides the minimum measured value of JId) was identified rather than the typical maximum load point.

Author Information

Logsdon, WA
The Ohio State University, Columbus, Ohio
Begley, JA
The Ohio State University, Columbus, Ohio
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 477–492
DOI: 10.1520/STP35556S
ISBN-EB: 978-0-8031-4703-4
ISBN-13: 978-0-8031-0356-6