CREEP INDUCED COHESIVE CRACK PROPAGATION IN MIXED MODE

摘要

We can draw the following conclusions:rn(a) Crack growth in quasi-brittle materials is the result of microcrack interaction and coalescence. The cohesive crack model replaces the details of such a process, which takes place on a very short length scale, with a discontinuity condition on the observation scale. The latter, acting on an evolving boundary, achieves the nature of a full constitutive law.rn(b) Creep induced crack propagation in concrete structures can be analysed within the framework of the cohesive crack model, a well established approach to the fracture mechanics of quasi-brittle materials.