The Influence of Finite Three-Dimensional Multiple Axial Erosions on the Fatigue Life of Partially Autofrettaged Pressurized Cylinders
Affiliation:
1. Center for Engineering and Applied Science, Department of Mechanical Engineering, Florida International University, Miami, FL 33199 2. Mechanical Engineering Department and Dean of Engineering Sciences, Pearlstone Center for Aeronautical Engineering Studies, Ben Gurion University of the Negev, Beer Sheva 84105, Israel 3. Mechanical Engineering Department, Carnegie-Mellon University, Pittsburgh, PA 15213
Abstract
Erosion geometry effects on the mode I stress intensity factor (SIF) for a crack emanating from the farthest erosion’s deepest point in a multiply, finite-length or full-length eroded, partially autofrettaged, pressurized, thick-walled cylinder is investigated. The problem is solved via the FEM method. Autofrettage, based on von Mises’ yield criterion, is simulated by thermal loading and SIFs are determined by the nodal displacement method. SIFs were evaluated for a variety of relative crack depths, a/t=0.01-0.30 and crack ellipticities, a/c=0.5-1.5 emanating from the tip of the erosion of various geometries, namely, (a) semi-circular erosions of relative depths of 1–10% of the cylinder’s wall thickness, t; (b) arc erosions for several dimensionless radii of curvature, r′/t=0.05-0.3; and (c) semi-elliptical erosions with ellipticities of d/h=0.5-1.5. In the cases of finite erosions, the semi-erosion length to the semi-crack length, Le/c, was between two and ten, erosion angular spacing, α, was between 7 and 120 degrees, whereas percent autofrettage investigated included 30%, 60%, and 100%. The normalized SIFs and the normalized effective SIFs of a crack emanating from the farthest finite erosion are found to rise sharply for values of Le/c<3. Both the normalized SIF and normalized effective SIF values are mitigated as the amount of partial autofrettage increases with the most rapid decrease occurring between 0–60% autofrettage. The purpose of this study is to detail these findings.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality
Reference18 articles.
1. Levy, C., Perl, M., and Ma, Q., 1999, “The Influence of Multiple Axial Erosions on The Fatigue Life of Autofrettaged Pressurized Cylinders,” Proceedings of the PVP Conference, PVP Vol. 384, ASME, New York, pp. 162–168. 2. Levy, C., Perl, M., and Ma, Q., 2000, “The Influence of a Finite Three Dimensional Multiple Axial Erosion on The Fatigue Life of Partially Autofrettaged Pressurized Cylinders,” Proceedings of the PVP Conference, PVP Vol. 417, ASME, New York, pp. 163–168. 3. Becker, A. A., Plant, R. C. A., and Parker, A. P., 1993, “Axial Cracks in Pressurized Eroded Autofrettage Thick Cylinders,” Int. J. Fract., 63, pp. 113–134. 4. Levy, C., Perl, M., and Fang, H., 1998, “Cracks Emanating From an Erosion in a Pressurized Autofrettaged Thick-Walled Cylinder: Part I—Semi-Circular and Arc Erosions,” ASME J. Pressure Vessel Technol., 120, pp. 354–358. 5. Parker, A. P., Plant, R. C. A., and Becker, A. A., 1993, “Fatigue Lifetimes for Pressurized Eroded Cracked Autofrettage Thick Cylinders,” Fracture Mechanics: Twenty-Third Symposium, ASTM STP 1189, Ravinder Chona, ed., ASTM, Philadelphia, PA, pp. 461–473.
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|