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← TechnologyWhich risk significantly increases when coolant flow ceases during high-speed lathe turning?
A)Elevated thermal stress crack propagation✓
B)Reduced machine tool electrical conductivity
C)Excessive buildup of static charge
D)Catastrophic decline in structural elasticity
💡 Explanation
Elevated thermal stress crack propagation becomes likely because without coolant, heat removal relies solely on conduction into the tool due to contact area, therefore thermal stresses concentrate, rather than being dissipated by convection. This leads to micro-crack formation initiating and propagating.
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