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← ScienceWhich outcome occurs when rapid thermal cycling exceeds design tolerance in high-pressure fuel injectors?
A)Fatigue crack propagation initiates quickly✓
B)Increased fuel laminar flow efficiency
C)Fuel auto-ignition temperatures decrease slowly
D)Injector pintle absolute rigidity increases
💡 Explanation
Accelerated fatigue crack propagation happens because of oscillating thermal stress exceeding the material's endurance limit; therefore, cracks develop, rather than remaining stable material, because cyclic stress causes cumulative damage, decreasing component lifespan.
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