13th International Conference on Fracture June 16–21, 2013, Beijing, China -2- Figure 1. sketch of the six components of wind tunnel balance Wind tunnel balance is special testing equipment for the wind tunnel testing. They are many rigorous procedures before and after the manufacture of a wind tunnel balance to ensure the balance to be qualified testing equipment. Wind tunnel balance flourishing many years accompany with the new structure and new application domain while the fatigue performance of the balance was ignored by most wind tunnel balance researchers. But this is a question which we could not inevitable, and this is the purpose of this paper also. 2. Fatigue Life Prediction of wind tunnel balance Fatigue Life Prediction of wind tunnel balance is the responsibility of every balance researcher as other engineering’s. Balance users would utilize balance reasonably after fatigue life prediction, and exception handles would also more easier. Supersonic wind tunnel balance usually bear impact load and steady load and even other complexity situations. Sensitivity of the wind tunnel balance is so excellent that even any relative collection data of the balance would show the trouble of the balance. All of these factors complexes the designing of a wind tunnel balance. Utilizing analysis method to replace the testing method is the goal of the finite element analysis for the balance, and this will decrease the workload and cut down the cost. Utilizing analysis method would get the accurate fatigue life data for the ability of complex geometry processing and anomalous load curse. Fatigue Life Prediction of wind tunnel balance included several steps. Firstly, we analysis the static stress of the wind tunnel balance, we obtained the dangerous sections or key points of the balance. After that, we take the process of the fatigue analysis until acquire the fatigue life data. 2.1. static stress analysis The first step of the fatigue life prediction is the static stress analyses, which will also the very important step in the whole curse. Static stress analyzes means that we load the balance by every possible load or rated load. The purpose of static stress analyzes is obtain the dangerous sections by various loading condition. The results of this analysis would play important role to the designing of a wind tunnel balance. Static stress analyses include several steps: modeling the balance; meshing, loading and solving the problem. 2.2. fatigue analysis
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