Analysis of Recent Fatigue Data Using the Structural Stress Procedure in ASME Div 2 Rewrite

[+] Author and Article Information
Pingsha Dong

 Center for Welded Structures Research, Battelle, Columbus, OH 43201-2693dongp@battelle.org

Jeong K. Hong

 Center for Welded Structures Research, Battelle, Columbus, OH 43201-2693hong@battelle.org

Abílio M. P. De Jesus

 University of Trás-os-Montes and Alto Douro, Engineering Department, Mechanical Engineering, Quinta de Prados, 5001-801 Vila Real, Portugalajesus@utad.pt

J. Pressure Vessel Technol 129(3), 355-362 (May 02, 2006) (8 pages) doi:10.1115/1.2748818 History: Received August 02, 2005; Revised May 02, 2006

In support of the ASME Div 2 Rewrite, a master S-N curve approach has been developed using a mesh-insensitive structural stress procedure for fatigue evaluation of welded components. The effectiveness of the master S-N curve approach has been demonstrated in a number of earlier publications for many joint types and loading conditions for pipe and vessel components as well as plate joints. To further validate the structural stress method, a series of recent test data (small weld details and a full-scale vessel) published by De Jesus (2004, Fatigue and Fracture of Engineering Materials and Structures, 27, pp. 799–810) were analyzed in this paper. A comparative assessment of various existing procedures and their effectiveness in correlating the fatigue test data by De Jesus is also presented. These assessment procedures include current ASME Sec. VIII Div 2, weld classification approach in PD 5500, and the surface extrapolation-based hot spot stress approach in recently approved European EN 13445 Standards.

Copyright © 2007 by American Society of Mechanical Engineers
Topics: Fatigue , Stress , Vessels
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Figure 1

Through-thickness structural stresses definition: (a) local stresses from FE model; (b) structural stress or far-field stress; (c) self-equilibrating stress and structural stress based estimation with respect to t1 (dashed lines)

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Figure 2

Weld line and weld element definitions used by the mesh-insensitive structural stress procedure for arbitrary curved weld in space

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Figure 3

Comparison of the nodal-forced mesh-insensitive structural stress method with ASME stress linearization method: element type effects (a×b=1t×1t)

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Figure 4

3D solid models with different mesh sizes for a doubling plate fillet weld specimen loaded in tension (quarter symmetry)

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Figure 5

Comparison of peak stress concentrations calculated at weld toe in a doubling plate fillet weld specimen loaded in tension (meshes shown in Fig. 4)

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Figure 6

Elliptical crack based I(r) functions using two crack aspect ratios approximating load-controlled conditions and displacement-controlled conditions

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Figure 7

Comparison of the structural stress based master S-N curves: (a) provisional version based on limited data available (about 150 tests) in WRC Bulletin No. 474; (b) current version incorporating about 800 fatigue tests

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Figure 8

Full-scale vessel and small-scale specimens fatigue tested by De Jesus (9) (dimensions in mm)

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Figure 9

Weld line definition for structural stress calculation and crack path observed in Detail 4 (9)

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Figure 10

“Weld line” definition used for structural stress calculation for the full-scale vessel fatigue test conducted by De Jesus (9) in which the structural stress is in the hoop direction of the vessel (the contour plot shows the maximum principal stresses from FEA output)

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Figure 11

Interpretation of the full-scale vessel and small-scale weld detail fatigue tests by De Jesus (9) using conventional stress parameters and the structural stress parameter proposed in this study

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Figure 12

Correlation of the full-scale vessel and small-scale weld detail fatigue tests by De Jesus (9) with the master S-N curve database (small empty circles) in terms of ΔSs

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Figure 13

Comparison of life estimations of the full-scale vessel test using various fatigue evaluation procedures




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