Overview: In this volume a survey of the most relevant nonlinear crackmodels is provided, with the purpose of analyzing the nonlinearmechanical effects occurring at the tip of macrocracks inquasi-brittle materials - such as concrete, rocks, ceramics,polymers, high-strength metallic alloys - and in brittle-matrixfibre-reinforced composites. Such local effects, as, for example,plastic deformation, yielding, strain-hardening, strain-softening,mechanical damage, matrix microcracking, aggregate debonding, fibrebridging, fibre slippage, crazing, and so on, are properly describedthrough different sim
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