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Research Papers: Structures and Safety Reliability

Fatigue Strength Assessment on a Multiplanar Tubular KK-Joints by Scaled Model Test

[+] Author and Article Information
Yue Jingxia

School of Transportation,
Wuhan University of Technology,
No. 1178, Heping Road,
Wuchang District,
Wuhan, Hubei 430063, China
e-mail: j.yue@whut.edu.cn

Liu Yuliang

School of Transportation,
Wuhan University of Technology,
No. 1178, Heping Road,
Wuchang District,
Wuhan, Hubei 430063, China
e-mail: liuyuliang@whut.edu.cn

Zhang Chi

School of Transportation,
Wuhan University of Technology,
No. 1178, Heping Road,
Wuchang District,
Wuhan, Hubei 430063, China
e-mail: chizhang@whut.edu.cn

Zeng Qi

School of Transportation,
Wuhan University of Technology,
No. 1178, Heping Road,
Wuchang District,
Wuhan, Hubei 430063, China
e-mail: zengqi1116@126.com

Dang Zhifan

School of Transportation,
Wuhan University of Technology,
No. 1178, Heping Road,
Wuchang District,
Wuhan, Hubei 430063, China
e-mail: dangzhifan296@163.com

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 2, 2015; final manuscript received November 18, 2015; published online January 21, 2016. Assoc. Editor: Myung Hyun Kim.

J. Offshore Mech. Arct. Eng 138(2), 021602 (Jan 21, 2016) (8 pages) Paper No: OMAE-15-1021; doi: 10.1115/1.4032158 History: Received March 02, 2015; Revised November 18, 2015

Multiplanar tubular KK-joints are one of the most popular joint types in offshore structures, which are exposed to cyclic loads and fatigue damages. In this paper, a fatigue prediction method based on scaled model test is proposed. First, a scaled KK-joint, including deviations for model simplification, was designed based on sensitive analysis and similarity analysis. Then, static and fatigue tests on the scaled model under axial loading were performed, by which hot spot stress (HSS) distributions and the maximum HSS were recorded. From the test, the fatigue crack initiates from the location of the maximum HSS and propagates along the weld toe. Finally, the maximum HSS of original KK-joint was deduced by finite element analysis (FEA), and then, the fatigue life was predicted accordingly and compared with the rule-based result.

Copyright © 2016 by ASME
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References

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Figures

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Fig. 1

Geometrical description of tubular KK-joint

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Fig. 7

Test rig and loading system

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Fig. 8

Measurement strain gauges around brace/chord intersection

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Fig. 9

HSS distribution along the weld toe of tubular KK-joint

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Fig. 10

Fatigue crack propagation at weld toe

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Fig. 11

Process of fatigue strength prediction based on scaled model

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Fig. 12

FEA on test model with rack inside the chord

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Fig. 13

HSS distributions of tubular KK-joints considering c deviation

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Fig. 14

HSS distributions of tubular KK-joints considering dimension deviation

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Fig. 15

Cσhss obtained from FEA and similarity analysis

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Fig. 16

S–N curves provided by ABS

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Fig. 6

HSS of tubular KK-joints with different dimensions

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Fig. 5

Stress contour plot of tubular KK-joint under axial loads

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Fig. 4

Definitions of HSS and reference stress location

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Fig. 3

General and local FE models for tubular KK-joints

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Fig. 2

Process of scaled model design

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