ABSTRACT
More sophisticated models for material behavior need to be incorporated into fracture mechanics analyses and modeling. For example, time-dependent nonlinear material behavior such as viscoplasticity and viscoelasticity are critical factors when creep failure is predominant, and similarly, there are other related parametric characterizations when addressing composite materials as well. Applied mechanics and materials science need to be involved in advanced design. Reducing weight, mitigation of testing and improved performance requires that the material be designed to help meet these goals. The chapter discusses the research in the micromechanics of fracture processes that has made the link between fracture mechanics parameters and local irreversible damage mechanisms clearer. Inglis arrived at estimating stresses at the edge of a hole or crack and the existence of singularity, which was then resolved by the invention of fracture mechanics. It is important to make a clear distinction between the classification of fracture problems based on global deformation mode and those based on local fracture mechanisms.
