13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Figure6. Life contour of six component load alone 3.2. fatigue Life Prediction of B630Q balance We defined the characteristic of the material which was used to manufacture balance. The material was used the structural steel. Detailed parameter were showed subsequently，Poisson’s Ratio is 0.3,Young’s Modulus is 2.0e+011Pa.Tensile Yield Strength is 2.5e+008 Pa, Compressive Yield Strength is 2.5e+008 Pa. Tensile Ultimate Strength is 4.6e+008 Pa, N-S curve showed in the figure 7. N Figure7. N-S curve of structural steel First, we used history data to simulate the balance. For simplification, the fatigue life prediction curse concerned on the impact on the balance while the wind tunnel startup and steady flow after that and the course of shut down the wind tunnel. We defined the load curve after colligate the My Z Mz Y Mx X S
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