13th International Conference on Fracture June 16–21, 2013, Beijing, China HLCCF loading at elevated temperature. This paper focuses on a crack growth life assessment method for a turbine component under HLCCF loading through experimental and numerical methods, as shown in Figure 1. Crack growth tests on five groups of full scale turbine components, attached to an actual turbine disc, were conducted under HLCCF loading at elevated temperature. In this study, we have developed a new Ferris wheel combined fatigue system to simulate the stress under HLCCF loads and temperature distributions of a full scale turbine blade attached to a part of actual turbine disk instead of simulated blades at elevated temperature based on our previous test system [9], and the details can be referred to [4]. Then the fracture mechanics (FM) analysis was utilized to simulate crack growth of the turbine component to implement crack growth. The lifetime criterion for withdrawal from service of turbine component was established based on experimental life data and predicted crack growth life. Figure 1. Strategy for crack growth life assessment of turbine component under HLCCF loading 2. Crack growth tests on turbine components 2.1. Experimental system for actual turbine attachment under HLCCF loading The loading scheme is the key technique of this experiment to achieve failure rendition of the mortise teeth in the laboratory. The diagrammatic sketch of the actual loading is shown in Figure 2. Where, F is the low cycle loading due mainly to the centrifugal force of the blade, and M is the vibration bending moment. Figure 2. A sketch of an attachment structure and loading To achieve a rational and noninterfering treatment of the HLCCF loading, a low and high cycle noninterference loading method for a full scale turbine blade attached to a part of the actual turbine disk is presented referred to [4] using a Ferris Wheel (a LCF tester). The sketch is shown in Figure -2-
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