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http://dx.doi.org/10.3795/KSME-A.2005.29.11.1472

Fatigue Life Estimation of Welded Joints considering Statistical Characteristics of Multiple Surface Cracks  

Han, Jeong Woo (한국기계연구원 기계시스템신뢰성연구센터)
Han, Seung Ho (한국기계연구원 기계시스템신뢰성연구센터)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.11, 2005 , pp. 1472-1479 More about this Journal
Abstract
Multiple surface crack distributed randomly along a weld toe influences strongly on the fatigue crack propagation life of welded joint. It is investigated by using statistical approaches based on series of systematic experiments. From the statistical results, initial crack numbers and its locations follow the normal distribution, and the probability of initial crack depths and lengths can be described well by tile Weibull distribution. These characteristics are used to calculate the fatigue crack propagation life, in which the mechanisms of mutual interaction and coalescence of the multiple cracks are considered as well as the Mk-factors obtained from a parametric study on the crack depths and lengths. The automatic calculation is achieved by the NESUSS, where the parameters such as the number, location and size of the cracks are all treated as random variables. The random variables are dealt through the Monte-Carlo simulation with sampling random numbers of 2,000. The simulation results show that the multiple cracks lead to much shorter crack propagation life compared with those in single crack situation. The sum of the simulation and tile fatigue crack initiation life derived by the notch strain approach agrees well with the experiments.
Keywords
Multiple Surface Crack; Fatigue Crack Propagation Life; M-Fractor; Normal Distribution; Weibull Distribution; Monte-Carlo Simulation;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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1 Nilsson, F., Brickstad, B. and Skanberg, L., 1990, 'Failure Probability of Nuclear Piping due to IGSCC,' Int. J. Pres. Ves. & Piping, Vol. 43, pp. 205-217   DOI   ScienceOn
2 Xie, L., 1999, 'Multi-crack Growth/Coalescence Simulation and its Role in Passive Component Leak-before-break Concept,' Nuclear Engineering and Design Vol. 194, pp. 113-122   DOI   ScienceOn
3 Bang, H. and Yoon, H., 2000, 'The Probability Distribution of Fatigue Crack Propagation Life considering Effect of Crack Coalescence,' Transactions of KSME (A), Vol. 24, No. 5, pp. 1281-1287   과학기술학회마을
4 Kim, J., Lee, J. and Hong, C., 1996, 'Fatigue Life Prediction for Multiple Surface Cracks in Finite Plates,' Transactions of the Society of Naval Architecture of Korea, Vol. 33, No. 4, pp. 75-86   과학기술학회마을
5 Han, J., Han, S., Shin, B. and Kim, J., 2004, 'Fatigue Life Estimation of Welded Joints by using Mk-factor under a Propagation Mechanism of Multiple Collinear Surface Cracks,' Journal of KWS, Vol. 22, No. 4, pp. 369-377   과학기술학회마을
6 Han, J., Han, S., Shin, B. and Kim, J., 2004, 'Fatigue Life Estimation of Cruciform Welded Joint considering Multiple Collinear Surface Cracks,' Transactions of KSME (A), Vol. 28, No. 10, pp. 1549-1557   과학기술학회마을   DOI
7 Han, J., Han, S., Shin, B. and Kim, J., 2004, 'Fatigue Life Estimation of Welding Details by Using a Notch Strain Approach,' Transactions of KSME (A), Vol. 28, No. 7, pp. 977-985   과학기술학회마을   DOI
8 Suh, C., Hwang, N. and Park, M., 1994, 'Fatigue Crack Growth, Coalescence Behavior and Its Simulation on Multi-surface Cracks,' Transactions of KSME, Vol. 18, No. 3, pp. 716-728   과학기술학회마을
9 Madox, S., 1975, 'An Analysis of Fatigue Cracks in Fillet Welded Joints,' International Journal of Fracture, Vol. 11, No. 2 pp. 221-243   DOI
10 Bowness, D and Lee, M., 2000, 'Prediction of Weld Toe Magnification Factors for Semi-elliptical Cracks in T-butt joints,' International Journal of Fatigue, Vol. 22, pp. 369-387   DOI   ScienceOn
11 Yamada, K., Makino, T., Baba, C. and Kikuchi Y., 1980, 'Fatigue Analysis Based on Crack Growth from Toe of Gusset End Weld,' Journal of JSCE, Vol. 303, pp. 31-41
12 Yamada, K., Makino, T. and Kikuchi Y., 1979, 'Fracture Mechanics Analysis of Fatigue Cracks Emanating from Toe of Fillet Weld,' Journal of JSCE, Vol. 292, pp. 1-12