Which failure mode is accelerated when microscopic casting voids initiate near the piston crown's combustion face?

💡 Explanation

When casting voids exist on the piston crown, thermal fatigue cracking is promoted as the voids act as stress concentrators under cyclic thermal loads from combustion. A crack grows inward because of repeated heating and cooling. Therefore, thermal fatigue cracking is accelerated, rather flutter, collapse, or wrist pin wear which depend other mechanisms.

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