Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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The Effect of Ultrasonic Impact Treatment(UIT) for Fatigue Life of Weldment

Ultrasonic Impact Treatment(UIT)효과가 용접재의 피로수명에 미치는 영향

  • Song, Jun-Hyouk (Department of Mechanical Engineering, Pusan National University) ;
  • Lee, Hyun-Woo (Department of Mechanical Engineering, Pusan National University)
  • Received : 2009.10.12
  • Accepted : 2010.04.12
  • Published : 2010.11.01
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Abstract

Welding structures are designed to endure its expected life. The most important factors are life. Especially on welded structure, fatigue strength is critical. So this study performed a research on Box and T shape weldment specimen to examine the influence of welding type. In this experiment, the results indicate Box shape was available in more than T shape. Fatigue tests were performed to evaluate the fatigue strength of the both as-welded and statically pre-loaded specimens by 3 point bending load. Fatigue life can be improved by using Ultrasonic Impact Treatment(UIT) effect. Ultrasonic Impact Treatment(UIT) is excellent for eliminating the tensile residual stresses and generating compressive residual stresses which elevate fatigue strength of welded structures. Also, this shows that welding part has better fatigue life and welding was performed well. In this study, to evaluate the Ultrasonic Impact Treatment(UIT) effect, for welding structure, the experiment was conducted at various levels of stress range between 100MPa and 500MPa. From the test results, it was indicated that fatigue performance was improving by Ultrasonic Impact Treatment(UIT)

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References

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