SYMPOSIA PAPER Published: 24 August 2020

Controlled Flaw Preparations for Heavy-Section Steel Fracture Mechanics Testing


Representative field testing to determine data for potential flaw propagation, fracture behavior, and margin against fracture for high-pressure-, high-temperature-service steel vessels subjected to increasing pressurization or thermal shock or both is premised on the investigator's ability to grow representative sharp cracks of known size, location, and orientation. Gaging for analytical stress and strain procedures and ultrasonic and acoustic emission instrumentation then can be applied to monitor the vessel during testing and to study crack growth.

Cracks were grown by two techniques: (1) a mechanical method within a premachined notch was sharpened by pressurization, and (2) a method combining electron beam welds and hydrogen charging to crack the chill zone of a rapidly placed autogenous weld. The mechanical method produces a naturally occurring growth shape controlled primarily by the shape of the machined notch; the welding-electrochemical method produces flaws of uniform depth from the surface of a wall or machined notch. Theories, details, discussions, and procedures are covered for both flaw-growing schemes.

Author Information

Holz, P., P.
Oak Ridge National Laboratory, Oak Ridge, Tenn., US
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Developed by Committee: E08
Pages: 463–477
DOI: 10.1520/STP791B1983027
ISBN-EB: 978-0-8031-7720-8
ISBN-13: 978-0-8031-0729-8