Accelerated life prediction of fillet-type, gas-welded joints

作者：Baek S Y; Bae D H^*

来源：International Journal of Automotive Technology, 2010, 11(3): 375-380.

DOI：10.1007/s12239-010-0046-9

• Fatigue design
• Fillet-type
• gas welded joint
• Welding residual stress
• Fatigue strength
• Fatigue design criterion
• Accelerated life prediction
• Statistical probability analysis

In this paper, in order to save time and cost for the fatigue design and to develop the optimum approaches for accelerated life prediction of the fillet gas welded joints, the (Delta sigma)(R) - N(f) relationship was obtained from actual fatigue test data, including welding residual stress. Based on these results, the (Delta sigma(a))(R) - (N(f))(ALP) relationship derived from the method of statistical probability analysis was compared with the actual fatigue test data. From the result, the optimum statistical distribution for the accelerated life prediction was analyzed to be the lognormal distribution for the fillet-type, gas-welded joint. The mean accuracy of the accelerated life prediction was assessed to be 85 similar to 95% of the actual test life at the 95% reliability level and +/- 15% standard deviation. Therefore, it is expected that the accelerated life prediction will provide a useful method for determining the criterion for fatigue design and for predicting a specific target life.

• 出版日期2010-6