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RESEARCH PAPERS

Extensions of the Failure Assessment Diagram Approach Semi-Elliptical Flaw in Pressurized Cylinders—Part II

[+] Author and Article Information
J. M. Bloom

Structural Mechanics Section, Babcock & Wilcox, A McDermott Company, Research and Development Division, Alliance, Ohio 44601

J. Pressure Vessel Technol 108(4), 485-489 (Nov 01, 1986) (5 pages) doi:10.1115/1.3264817 History: Received June 20, 1985; Revised December 23, 1985; Online November 05, 2009

Abstract

Approximate closed-form J -integral expressions based on the estimation scheme for use in the Deformation Plasticity Failure Assessment Diagram (DPFAD) approach are presented for an axially oriented semi-elliptical flaw in a pressurized cylinder for crack depth to wall thickness ratios, a/t , from 1/4 to 3/4 and aspect ratios, a/l , from 0 to 1/2. The DPFAD approach was used to derive closed-form J -integral expressions from limited elastic-plastic finite element solutions. Results are also presented in terms of the DPFAD curves as functions of a/t and a/l for the strain-hardening exponent of n = 8.6. Curves are given for the calibration constant h 1 as a function of a/t and a/l for ease of interpolation. Lastly, discussion is provided as to the applicability of the solutions and a possible interpolation scheme for obtaining h 1 values for n other than 8.6.

Copyright © 1986 by ASME
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