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← ScienceWhich outcome occurs when exceeding the design limits of reciprocating engine's connecting rod?
A)Increased frictional bearing surface temperature
B)Decreased volumetric unburned mixture efficiency
C)Catastrophic fatigue fracture occurs rapidly✓
D)Elevated compression ratio during adiabatic phase
💡 Explanation
Catastrophic fatigue fracture occurs because exceeding design limits promotes cyclical stress, driving fatigue crack propagation via crack tip plasticity mechanism; therefore fracture, rather than altered efficiency, is expected, because the material fails structurally, not thermodynamically, initially.
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