Abstract
Materials such as concrete rocks and fiber-reinforced composites when extended exhibit strain-softening behavior. The softening is assumed to be localized in a narrow band, outside of which the material behaves linearly. Such a strip region is regarded as a process zone or an extended portion of the actual crack; it is damaged but can still transfer load. Assumed is a linear variation of the stress in this zone with the crack opening displacement. Presented will be the theoretical development and numerical analysis of this henceforth referred to “fictitious crack model”. Results will be obtained to examine the directional stability of crack trajectories developed in a mixed mode load environment and they are compared with experiments.
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