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Which consequence results when differential thermal expansion strains turbine blades?

A)Mechanical stress causes fatigue cracking
B)Increased aerodynamic surface boundary layers
C)Elevated vibrational resonance frequencies
D)Reduced thermal barrier coating oxidation

💡 Explanation

Fatigue cracking occurs because cyclic thermal stress induces crack propagation at grain boundaries through dislocation movement, therefore material failure results, rather than boundary layers or frequency changes which have other mechanisms influencing them.

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