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Energy Balance

Energy Balance
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  Energy Balance Approach to Fracture Introduction to Fracture Mechanics  Griffith Criterion 2a          l     o     a        d elongationP  OBCAcrack length, acrack length, a+da(a)(b)   Total Energy Content  In an elastic, remotely loaded cracked plate, the total energy content is:  F U U U U  ao       Total Energy Content  U  o  = elastic energy of the loaded un-cracked plate (a constant).  U  a  = change in elastic energy caused by crack presence.  U    change in elastic energy caused by the formation of the crack new surfaces.  F   = work performed by external forces.  
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