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1656_C006.fm  Page 292  Monday, May 23, 2005  5:50 PM





                       292                                 Fracture Mechanics: Fundamentals and Applications




















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                                                             (b)













                                                             (c)
                       FIGURE 6.39 Schematic illustration of crack growth in concrete, together with two simplified models:
                       (a) crack growth in concrete, (b) process zone idealized as a zone of strain softening, and (c) process zone
                       idealized by closure tractions.
























                       FIGURE 6.40 Typical tensile response of concrete.
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