A micromorphic model for steel fiber reinforced concrete.

摘要: Abstract A new formulation to model the mechanical behavior of high performance fiber reinforced cement composites with arbitrarily oriented short fibers is presented. The can be considered as a two scale approach, in which macroscopic model, at structural level, takes into account mesostructural phenomenon associated fiber–matrix interface bond/slip process. This contemplated by including, description, micromorphic field representing relative fiber–cement displacement. Then, theoretical framework, from governing equations problem are derived, assimilated specific case material multifield theory. balance equation derived for this connecting micro stresses forces, has physical meaning related bond slip mechanism. Differently previous procedures literature, addressed composites, where been added an additional independent ingredient methodology, present approach it arises natural result Every component composite defined free energy and constitutive relation. mixture theory adopted define overall composite, assumed homogeneously constituted, sense that every infinitesimal volume occupied all components proportion given corresponding fraction. numerical assessed means selected set experiments prove viability approach.