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Open AccessArticle

Fiber Bragg Gratings Based Cyclic Strain Measuring of Weld Toes of Cruciform Joints

by Guoqian Wei 1,2,*, Shanshan Li 1,2, Yongxing Guo 1,2 and Zhang Dang 1,2
1
Key Laboratory of Metallurgical Equipment and Control Technology, WUST, Ministry of Education, Wuhan 430081, China
2
Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, WUST, Wuhan 430081, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(14), 2939; https://doi.org/10.3390/app9142939
Received: 27 June 2019 / Revised: 19 July 2019 / Accepted: 22 July 2019 / Published: 23 July 2019
(This article belongs to the Special Issue Selected Papers from IMETI 2018)
The real weld toe geometry is generally not mathematically perfect, resulting in obvious stress concentration effects, both on the weld section and along the longitudinal direction of the weld toe. The true stress-strain state at the local weld toe directly affects the fatigue performance and behavior of the welded structure. Therefore, a Fiber Bragg Grating (FBG) sensor based method for testing the cyclic strain at the weld toe was proposed. Cruciform welded joints were fabricated as specimens on which FBG sensors were arranged at several characteristic points along the weld toe curve. Strains at all the characteristic points under cyclic tensile load were measured and recorded, which showed the proposed measuring method could accurately obtain the complete local strain time histories along the weld toe. The strain time histories clearly reflected the cyclic hardening phenomenon in the early stage and the plastic yielding phenomenon in the final stage. Furthermore, based on the cyclic stress-strain constitutive model of the weld material, the stress-strain response curves of all the characteristic points were drawn. Combined with the fatigue fracture morphology, the mechanism of the unsynchronized initiation of the multiple cracks in the weld toe was investigated. View Full-Text
Keywords: cruciform joints; FBG sensors; cyclic strain; weld toe multiple cracks; fatigue test cruciform joints; FBG sensors; cyclic strain; weld toe multiple cracks; fatigue test
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MDPI and ACS Style

Wei, G.; Li, S.; Guo, Y.; Dang, Z. Fiber Bragg Gratings Based Cyclic Strain Measuring of Weld Toes of Cruciform Joints. Appl. Sci. 2019, 9, 2939.

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