Fatigue strength of gas turbine compressor blades

✍ Scribed by V.T. Troshchenko; A.V. Prokopenko

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 271 KB
• Volume: 7
• Category: Article
• ISSN: 1350-6307
• DOI: 10.1016/s1350-6307(99)00013-8

✦ Synopsis

An experimental procedure has been developed for the investigation of fatigue and crack growth resistance of materials and real compressor blades. Methods for the determination of stress intensity factors in specimens and in blades with cracks have been justi®ed. Investigations have been performed into the in¯uence of manufacturing residual stresses and surface defects in the form of simulators of dents, corrosion pits, and nonmetallic inclusions on fatigue strength of steels and a titanium alloy. The characteristics of the material crack growth resistance have been studied considering the eect of the medium (sea water) and stress ratio in a cycle, as well as fatigue strength of newly-manufactured blades and those after being in operation. Speci®c features of fatigue crack propagation in blades have been considered and a method for predicting the life of blades with cracks has been justi®ed.