Which risk increases when steam turbine blades experience resonant vibrations due to harmonic steam excitation?

💡 Explanation

When turbine blades resonate, cyclical stress amplitude increases dramatically due to mechanical resonance, leading to accelerated crack initiation and propagation, which defines high cycle fatigue. Therefore high-cycle fatigue cracking increases, rather than creep, pitting, or erosion, which have different root causes and time scales.

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