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← TechnologyWhich effect arises when cryogenic propellant tank's **vaporizer valve** experiences rapid cycling?
A)Valve seat material thermal fatigue✓
B)Propellant film boiling stabilization
C)Regenerative heating loop enhancement
D)Increased fluid density stratification
💡 Explanation
Thermal fatigue occurs because rapid valve cycling induces alternating stress concentration via thermal **ratcheting**. This causes cyclic plastic deformation, therefore valve material degrades eventually rather than stabilizes the whole assembly due to high temperature variations.
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