SYMPOSIA PAPER Published: 01 January 1997

Stress Intensity Magnification Factors for Fully Circumferential Cracks in Valve Bodies (Thick Cylinders)


The stress intensity solutions presented herein were obtained using an energy method in conjunction with a two-dimensional finite element program in order to explicitly account for curvature effect for fully circumferential cracks. The magnification factors for a specific crack depth were calculated by successively loading the crack surface by a uniform, linear, quadratic, and a cubic loading distribution. The magnification factors can be used to calculate the stress intensity factors by superposition method.

The functions for each load condition in terms of radius to thickness ratio (R/t) and a fractional distance in terms of crack depth to thickness ratio (a/t) were developed. The validity of these function is R/t = 1.5 to 10.0 and for 0.0125 ⩽ a/t ⩽0.8125. The functions agree to within 1% of the finite elements solutions for most magnification factors.

Author Information

Toor, PM
Bettis Atomic Power Laboratory, West Mifflin, PA
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Developed by Committee: E08
Pages: 641–655
DOI: 10.1520/STP12334S
ISBN-EB: 978-0-8031-5374-5
ISBN-13: 978-0-8031-2410-3