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                       232                                 Fracture Mechanics: Fundamentals and Applications





































                       FIGURE 5.13 Mechanism for ductile crack growth: (a) initial state, (b) void growth at the crack tip, and, (c)
                       coalescence of voids with the crack tip.

































                       FIGURE 5.14 Stress and strain ahead of a blunted crack tip, determined by finite element analysis. Taken
                       from McMeeking, R.M. and Parks, D.M., ‘‘On Criteria for J-Dominance of Crack-Tip Fields in Large-Scale
                       Yielding.” ASTM STP 668, American Society for Testing and Materials, Philadelphia, PA, 1979, pp. 175–194.
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