In structural materials, sharp cracks concentrate stress at their tips, creating infinitely intense stress that can cause catastrophic failure, while smooth deformations like dents distribute stress more evenly and are less dangerous.
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THE TINY FLAW DESTROYING AIRPLANESAdded:
Why does a tiny invisible hairline crack destroy a jet while a massive ugly dent does absolutely nothing? It is all about how stress flows. Think of it like a crowd of people. A big dent is just a gentle curve, but a sharp crack acts like a lightning rod for force. The pressure energy has nowhere to [music] go, so it shatters the metal. But wait, it gets even wilder. At the tip of that tiny crack, the stress becomes infinitely intense, turning a simple piece of aluminum into a ticking time bomb. [music]
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