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Offshore and Structural Mechanics

Fatigue Capacity of Load Carrying Fillet-Welded Connections Subjected to Axial and Shear Loading

[+] Author and Article Information
Inge Lotsberg

 DNV, NO-1322 Høvik, Norway

J. Offshore Mech. Arct. Eng 131(4), 041302 (Sep 04, 2009) (9 pages) doi:10.1115/1.3160531 History: Received August 15, 2008; Revised December 19, 2008; Published September 04, 2009

The status on current design recommendations concerning the fatigue capacity of load carrying fillet welds was presented by Maddox (Maddox, S., 2006, “Status Review on Fatigue Performance of Fillet Welds,” Proceedings of the OMAE Conference, Hamburg, Germany, Jun., Paper No. OMAE2006-92314) based on a literature survey. In order to examine the validity of the recommendations and to supplement the fatigue test database, a test matrix with 33 specimens was developed. This included 8 simple fillet-welded cruciform joints that were subjected to axial loading and 25 fillet-welded tubular specimens that were subjected to axial load and/or torsion for simulation of a combined stress condition in the fillet weld. The data obtained from these fatigue tests are presented in this paper. The test data are also compared with design guidance from IIW (1996, Fatigue Design of Welded Joints and Components: Recommendations of IIW Joint Working Group XIII-XV, A. Hobbacher, ed., Abington Publishing, Cambridge), Eurocode 3 (1993, Eurocode 3: Design of Steel Structures—Part 1–1: General Rules and Rules for Buildings), and DNV-RP-C203 (DNV, 2005, DNV-RP-C203, Fatigue Strength Analysis of Offshore Steel Structures).

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of fillet weld connection showing stress components

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Figure 2

Geometry of test specimens 3 and 4

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Figure 3

Fillet-welded tubular test specimen

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Figure 4

Fatigue test results obtained from cruciform joints based on nominal stress without correction for any misalignment-induced bending

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Figure 5

Forces acting on a fillet-welded connection

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Figure 6

Comparison of design curves and fatigue test data corrected for misalignment-induced bending

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Figure 7

Calculated standard deviation of log N as function of thickness exponent

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Figure 8

Sketch of the rig used to test tubular specimens

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Figure 9

Photo of test specimen in test rig

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Figure 10

Photo of fatigue tested specimens

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Figure 11

Fatigue test data for specimens 9 and 10 (pure axial loading)

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Figure 12

Fatigue test data for specimens 11–20 compared with Eurocode

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Figure 13

Test data for specimens 11–20 compared with DNV-RP-C203

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Figure 14

Comparison of combined stresses at 200,000 cycles using different design codes

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Figure 15

Comparison of combined stresses at 2×106 cycles using different codes

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Figure 16

Fatigue test data compared with interaction curve based on IIW at 200,000 cycles

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Figure 17

Fatigue test data compared with interaction curve based on Eurocode 3 at 200,000 cycles

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Figure 18

Fatigue test data compared with interaction curve based on DNV-RP-C203 at 200,000 cycles

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Figure 19

Fatigue test data compared with DNV-RP-C203

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