Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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An Analysis on Durability Improvement of Twist Run Exercise Equipment

트위스트 런 운동기구의 내구성 향상에 관한 해석

  • Han, Moon Sik (Keimyung University Mechanical and Automotive Engineering Dept.) ;
  • Cho, Jae Ung (Kongju National University Mechanical and Automotive Engineering Div.)
  • Received : 2014.03.18
  • Accepted : 2014.10.20
  • Published : 2014.10.31
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Abstract

In this study, 2 kinds of twist run models as exercise equipments are compared by durability analyses of fatigue and vibration. Maximum equivalent stresses are shown as 3.3 MPa and 16.6 MPa at the parts of stress concentrations at models 1 and 2. As the values becomes much lower than yield stress of this models, these models are shown to be safe designs. Model 1 becomes stronger than model 2 at natural frequency analysis. Fatigue lives become lowest at four axis parts and one axis part respectively in cases of models 1 and 2. Maximum damage probability at fatigue is shown to be 2.4% near the average stress of 0 in case of model 1 but this probability becomes 0.6 % in case of model 2. Model 1 has the maximum damage possibility 4 times more than model 2 at these states. As the result of this study is applied by the design of twist run, the prevention on fatigue damage and the durability are predicted.

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References

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