[1] Jiao Jinfeng, Lei Honggang, Chen Y Frank,. Numerical simulation and experimental studyon constant amplitude fatigue behaviorof welded cross plate-hollow sphere joints [J]. Journal of Southeast University (English Edition), 2018, 34 (1): 62-70. [doi:10.3969/j.issn.1003-7985.2018.01.010]

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Numerical simulation and experimental studyon constant amplitude fatigue behaviorof welded cross plate-hollow sphere joints()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

34

Issue:

2018 1

Page:

62-70

Research Field:

Civil Engineering

Publishing date:

2018-03-20

Info

Title:

Numerical simulation and experimental studyon constant amplitude fatigue behaviorof welded cross plate-hollow sphere joints

Author(s):

Jiao Jinfeng¹;  Lei Honggang¹;  Chen Y Frank²

¹College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
²Department of Civil Engineering, Pennsylvania State Harrisburg, Middletown, PA 17057, USA

Keywords:

welded cross plate-hollow sphere joint;  constant amplitude load;  finite element analysis;  S-N curve

PACS:

TU391

DOI:

10.3969/j.issn.1003-7985.2018.01.010

Abstract:

In order to reveal the constant-fatigue fracture form and mechanism of the welded cross plate-hollow sphere joints(WCPHSJs)and establish its formula, the WCPHSJs were fatigue tested. A total of 19 specimens were tested under constant amplitude fatigue loads using a specially designed test rig. The joint was analyzed statically by the finite element analysis(FEA), and metallographic analysis of fatigue fracture was done by the electron scanning microscope. Numerical simulation and experimental results show that the hot-spot of WCPHSJ lies at the weld toe location where severe stress is concentrated. Fatigue cracks initiate at the weld toe and then propagate circumferentially around the sphere with a diameter equivalent to the width of the cross plate up to the fatigue fracture. The initial welding defects and constructional detail constitute the main factor of fatigue failure. The S-N curves for the joints were developed through a linear regression analysis of fatigue data. A formula for calculating constant amplitude fatigue, based on the concept of the hot spot stress amplitude, is proposed.

References:

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Memo

Memo:

Biographies: Jiao Jinfeng(1979—), male, doctor, associate professor, jiaojf_1@126.com; Lei Honggang(corresponding author), male, doctor, professor, lhgang168@126.com.
Foundation items: The National Natural Science Foundation of China(No.51578357), the Natural Science Foundation of Shanxi Province(No.2015011062), Talent Training Program in the Postgraduate Joint Training Base of Shanxi Province(No.2016JD11).
Citation: Jiao Jinfeng, Lei Honggang, Chen Y Frank. Numerical simulation and experimental study on constant amplitude fatigue behavior of welded cross plate-hollow sphere joints[J].Journal of Southeast University(English Edition), 2018, 34(1):62-70.DOI:10.3969/j.issn.1003-7985.2018.01.010.

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