J estimation method for a semi-elliptical surface flaw in a cylinder

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Journal of Pressure Vessel Technology; (United States)

DOI:https://doi.org/10.1115/1.2842092· OSTI ID:6466530

Yoon, K K; Killian, D E ^[1]

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1. B and W Nuclear Technologies, Lynchburg, VA (United States)

With the emergence of readily available simple J solutions for various types of structures through J estimation techniques, J-integral-based elastic-plastic fracture mechanics has become a common tool for analyzing ductile materials. This paper presents elastic-plastic solutions for semi-elliptical surface flaws of four different crack depths. Solutions are developed from a series of finite element analyses using the ABAQUS computer program with a deformation plasticity material constitutive law. Although the solutions are directly applicable to a single set of Ramberg-Osgood material parameters, they may be extended to include various amounts of strain hardening by a ratioing technique utilizing calibration functions from the EPRI handbook for continuous flaws. This paper addresses cylindrical structures loaded by internal pressure, and excludes any consideration of thermal loadings. Elastic-plastic J solutions, determined for pressures up to 5,000 psi (13,700 Pa), or twice the design pressure, depart from plastic-zone-corrected linear elastic predictions at approximately 3,000 psi (7,620 Pa) pressure. The h[sub 1] plastic calibration functions derived in this paper are limited to the point of greatest crack depth in 6:1 aspect ratio semi-elliptical inside surface flaws in cylindrical reactor pressure vessels.

• OSTI ID: 6466530
• Journal Information: Journal of Pressure Vessel Technology; (United States), Journal Name: Journal of Pressure Vessel Technology; (United States) Vol. 117:1; ISSN JPVTAS; ISSN 0094-9930
• Country of Publication: United States
• Language: English

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