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 h1 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 h1 values for n other than 8.6.
Extensions of the Failure Assessment Diagram Approach Semi-Elliptical Flaw in Pressurized Cylinders—Part II
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Bloom, J. M. (November 1, 1986). "Extensions of the Failure Assessment Diagram Approach Semi-Elliptical Flaw in Pressurized Cylinders—Part II." ASME. J. Pressure Vessel Technol. November 1986; 108(4): 485–489. https://doi.org/10.1115/1.3264817
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