13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- above situation. The load curve was showed in figure8. Figure8. load curve of the B630Q balance Life contour of balance B636Q bearing the combination load was showed in figure 9. We can conclude that the minimum life of balance is 2616 cycles, and the dangerous section was in the root of the supporting beam. Figure9 Life contour of balance B630Q bearing the combination load Second, we used solution combination methods to solve this problem. We combined the lift force、pitching moment and axial force according the actual using setting.Life contour of balance B630Q subjected the combination load was showed in figure 10. We can conclude that the minimum life of balance is 15388 cycles, and the dangerous section was not in the root of the axial force element but in the root of the rectangular section. These results maybe arise from the actual load curve didn’t contain the side force and yawing moment. Figure10 Life contour of balance B630Q bearing the combination load 4. conclusions This paper developed a method to predict the fatigue life of a wind tunnel balance, which was verified by a B630Q balance. References [1] J.T.barnby, Fatigue, science Press, 1984. [2] QIAN Yi,CUI Wei-cheng, An approach for prediction fatigue crack growth based on the cumulative damage theory and elasto-plastic stress field of crack tip, Journal of Ship Mechanics, 2012 ,Vol.16 No.8, 954-961. [3] He DeXin， Wind Tunnel Balance. Press of Defense Industry China, 2011
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