Failure Analysis of Rotating Component
Rotating components such as shafts, pistons, cam, gears, etc. operate under a broad range of service conditions, including dusty or corrosive environment and at variety of temperatures ranging from extremely low (as in cryogenic environments) to extremely high (as in gas turbines). In addition, they are also subjected to a variety of loads - in general, tension, torsion, compression, bending, or combinations thereof. These components are also sometimes subjected to vibratory stresses. The most common cause for failure of rotating components can be fatigue which occurs under cyclic loading conditions. Fatigue failures start at the most vulnerable point in a dynamically stressed area - typically a stress raiser, which may be mechanical, metallurgical, or sometimes a combination of the two. Stress concentration effectively reduces fatigue resistance, especially when coupled with fretting. Metallurgical stress raisers may be quench cracks, corrosion pits, gross non-metallic inclusions, brittle second-phase particles, weld defects, or arc strikes.
TCR has expertise in identifying such characteristics from the failed component and reach up to the root cause of failure.