Advanced [gas] Turbine System - Conceptual Design [final

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Extra info for Advanced [gas] Turbine System - Conceptual Design [final rpt]

Example text

Fracture Analysis Uncoated Testpieces Multiple cracking was observed in the uncoated testpieces at the various strain ranges tested, and generally, cracks initiated from both outside and inside surfaces of the testpiece and subsequently propagated into the substrate perpendicular to the surface. Extensive secondary cracking was observed, as can be seen in Figure 12 and was greatest on the internal surface. Occasionally a secondary crack oriented 45 to the specimen surface was observed (Figure 13), and small multiple cracks were often present on the surface.

It should be noted that in this analysis no specific failure criterion was established for the TBC, and the process of crack formation and subsequent propagation was not analyzed. However, some indications of the failure mechanism can be 8 Appendix 1 determined from analysis of the behavior of testpieces coated with TBC which were exposed in a burner rig and which have also been analyzed by the FE method. In this case cracks form above the peaks in the bondcoat t and the FE calculations predict that the stresses in the valleys change from compression to tension during exposure in the burner rig and cracks then propagate from peak to peak through regions of tensile stress until fracture occurs.

Increased maximum temperatures and the introduction of hold times both reduced TMF resistance. 4. The TMF resistance of testpieces coated with thermal barriers was comparable to that of the uncoated alloy presumably because of the effect of the TBC in reducing metal temperatures. 10 Appendix 1 5. In most cases failure occurred as a result of the propogation of cracks that initiated in the coating and in testpieces with TBC’s oxide growth made little contribution to the failure process. Perhaps a longer dwell time at the maximum temperature would have changed this.

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