Structural Engineering and Mechanics

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Influence of geometry and safety factor on fatigue damage predictions of a cantilever beam

  • Pecnik, Matija (University of Ljubljana, Faculty of Mechanical Engineering) ;
  • Nagode, Marko (University of Ljubljana, Faculty of Mechanical Engineering) ;
  • Seruga, Domen (University of Ljubljana, Faculty of Mechanical Engineering)
  • Received : 2018.01.05
  • Accepted : 2019.02.08
  • Published : 2019.04.10
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Abstract

The influence of two parameters on fatigue damage predictions of a variably loaded cantilever beam has been examined. The first parameter is the geometry of the cantilever beam and the weld connecting it to a rear panel. Variables of the geometry examined here include the cantilever length, the weld width on the critical cross-section and the angle of the critical cross-section. The second parameter is the safety factor, as set out by the Eurocode 3 standard. An analytical approach has been used to calculate the stresses at the critical cross-section and standard rainflow counting has been used for the extraction of the load cycles from the load history. The results here suggest that a change in the width and angle of the critical cross-section has a non-linear impact on the fatigue damage. The results also show that the angle of the critical cross-section has the biggest influence on the fatigue damage and can cause the weld to withstand fatigue better. The second parameter, the safety factor, is shown to have a significant effect on the fatigue damage calculation, whereby a slight increase in the endurance safety factor can cause the calculated fatigue damage to increase considerably.

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