Experimental Study on Variable-Amplitude Fatigue of Welded Cross Plate-Hollow Sphere Joints in Grid Structures

Jin Feng Jiao, Hong Gang Lei, Y. Frank Chen

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4 Scopus citations

Abstract

The fatigue stress amplitude of the welded cross plate-hollow sphere joint (WCPHSJ) in a grid structure varies due to the random loading produced by suspending cranes. A total of 14 specimens considering three different types of WCPHSJs were prepared and tested using a specially designed test rig. Four typical loading conditions, "low-high,""high-low,""low-high-low,"and "high-low-high,"were first considered in the tests to investigate the fatigue behavior under variable load amplitudes, followed by metallographic analyses. The experimental and metallographic analysis results provide a fundamental understanding on the fatigue fracture form and fatigue mechanism of WCPHSJs. Based on the available data from constant-amplitude fatigue tests, the variable-amplitude fatigue life of the three types of WCPHSJs was estimated using the Miner rule and Corten-Dolan theory. Since both accumulative damage theories yield virtually same damaging results, the Miner rule is hence suggested to estimate the fatigue life of WCPHSJs.

Original languageEnglish (US)
Article number8431584
JournalAdvances in Materials Science and Engineering
Volume2018
DOIs
StatePublished - 2018

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • General Engineering

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