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About: Crack growth resistance curve     Goto   Sponge   NotDistinct   Permalink

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In materials modeled by linear elastic fracture mechanics (LEFM), crack extension occurs when the applied energy release rate exceeds , where is the material's resistance to crack extension. Conceptually can be thought of as the energetic gain associated with an additional infinitesimal increment of crack extension, while can be thought of as the energetic penalty of an additional infinitesimal increment of crack extension. At any moment in time, if then crack extension is energetically favorable. A complication to this process is that in some materials, is not a constant value during the crack extension process. A plot of crack growth resistance versus crack extension is called a crack growth resistance curve, or R-curve. A plot of energy release rate versus crack extension for