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Table 1. Temperatures and Stresses in vanes and EBC Vane Analysis No EBC With EBC: 1 Step Analysis With EBC: 2 Step Analysis Analysis Step RT to operation RT to operation APS to RT RT to operation Temperatures (F) Vane EBC 2376/1185 - 2352/1191 2413/1255 RT RT 2352/1191 2413/1255 Location of Max. Stress Vane TE Vane TE Coating Vane TE Max. Princ. Stres SN282 A 35.5 52.8 23 - 25 1 37.8 In order to quantify the effect of substrate CTE on the stresses, the FEA of vanes was repeated with the properties of AS800. Table 1 shows the stresses in the vane with and without the EBC coating. As can be seen, the maximum stress without the EBC is higher in AS800 than that in SN282. This is expected due to higher CTE of AS800 compared to SN282. The effect of the EBC on AS800 vane stresses is reverse of that observed in the case of SN282. The maximum stress decreases from 340 to 325 MPa (49.4 to 47.2 ksi). This is likely due to fact that the CTE of AS800 has a better match to the CTE of the EBC than SN282 (Figure 4). The analysis suggests that the substrate CTE has a significant influence on the stresses in the vanes. (a) (a) (b) Figure 5. (a) Temperature distribution in uncoated SN282 vane at steady state condition and (b) Maximum principal stress (psi) distribution. Maximum stress is located at the trailing edge. (b) Figure 6. Temperature distribution in EBC coated SN282 vane at steady state condition (in °F). (a) in EBC (b) in substrate under EBC 136 Copyright © 2004 by ASMEPDF Image | ADVANCED MICROTURBINE SYSTEMS Final Report for Tasks 1 Through 4 and Task 6
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