Stress and Fatigue Life Modeling of Cannon Breech Closures Including Effects of Material Strength and Residual Stress

[+] Author and Article Information
John H. Underwood

US Army Armament Research, Development & Engineering Center, Benet Laboratories, Technology Division, Watervliet, NY 12189e-mail: junder@pica.army.mil

Michael J. Glennon

US Army Armament Research, Development & Engineering Center, Benet Laboratories, Design and Development Division, Watervliet, NY 12189

J. Pressure Vessel Technol 123(1), 150-154 (Jul 17, 2000) (5 pages) doi:10.1115/1.1320442 History: Received January 25, 2000; Revised July 17, 2000
Copyright © 2001 by ASME
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Underwood, J. H., and Parker, A. P., 1997, “Fatigue Life Assessment of Steel Pressure Vessels with Varying Stress Concentration, Residual Stress and Initial Cracks,” Advances in Fracture Research, Vol. 1, Pergamon, Oxford, England, pp. 215–226.
Roark, R. J., and Young, W. C., 1975, Formulas for Stress and Strain, McGraw-Hill, New York, NY, pp. 590–606.
Underwood, J. H., 1984, “Fatigue Life Analysis and Tensile Overload Effects with High Strength Steel Notched Specimens,” Materials Research Society Symposium Proceedings, Vol. 22, Elsevier Science Publishing, London, pp. 209–214.
Parker,  A. P., Underwood,  J. H., and Kendall,  D. P., 1999, “Bauschinger Effect Design Procedures for Autofrettaged Tubes Including Material Removal and Sachs’ Method,” ASME J. Pressure Vessel Technol., 121, pp. 430–436.


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Typical single-lug and multi-lug cannon breech configurations
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Finite element contours of maximum principle stress in series 1 multi-lug breech with typical firing load applied; following overload to produce residual stresses at lug root radii
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Measured fatigue lives from four series of cannon breech tests
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Comparison of two recent tests with mean lives from cannon breech tests
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Comparison of cannon breech and cannon tube fatigue results
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Effect of 5 to 20 percent pressure increase on calculated fatigue lives for various breech conditions



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