Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Fatigue Analysis Study on the Fractured Fixing Bolts of Mobile Elevated Work Platforms

고소작업대의 파손된 고정볼트의 피로분석에 관한 연구

  • Choi, Dong Hoon (Department of Mechanical Engineering, Chungnam National University) ;
  • Kim, Jae Hoon (Department of Mechanical Engineering, Chungnam National University)
  • Received : 2019.06.24
  • Accepted : 2019.09.10
  • Published : 2019.10.31
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Abstract

The mobile elevated work platforms(MEWPs) consist of work platform, extending structure, and car, and it is a facility to move persons to working positions. MEWPs are useful but composed complex pieces of equipments, and accidents are caused by equipment defects. Among them, accidents caused by fracture of the bolts fixing the extension structure and the turntable are increasing. In this study, fatigue failure and fatigue life of a turntable fixing bolt subjected to irregular fatigue load were analyzed by FEA. For this purpose, finite element modeling is proposed and structural analysis and fatigue analysis are performed simultaneously for fixing bolts. As a result of the structural analysis, it was confirmed that there is no risk of permanent deformation because the maximum stress acting on the fixing bolt is lower than the yield strength, and fatigue analysis was confirmed that the fatigue life is less than the design standard. The fatigue analysis results of this study can be effectively used for the design and the documentary assessment of the safety certification of the MEWPs by examining the fatigue life of the turntable fixing bolt.

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