Computational modeling of high performance steel fiber reinforced concrete using a micromorphic approach

A E. HUESPE; J. OLIVER,; D.F. MORA

COMPUTATIONAL MECHANICS

SPRINGER

Lugar: Berlin; Año: 2013 vol. 52 p. 1243 - 1264

0178-7675

A finite element methodology for simulating thefailure of high performance fiber reinforced concrete composites(HPFRC),with arbitrarily oriented short fibers, is presented.The composite material model is based on a micromorphicapproach. Using the framework provided by thistheory, the body configuration space is described throughtwo kinematical descriptors. At the structural level, the displacementfield represents the standard kinematical descriptor.Additionally, a morphological kinematical descriptor,the micromorphic field, is introduced. It describes the fiber-matrix relative displacement, or slipping mechanism of thebond, observed at the mesoscale level. In the first part of thispaper,wesummarize the model formulation of the micromorphicapproach presented in a previous work by the authors.In the second part, and as the main contribution of the paper,we address specific issues related to the numerical aspectsinvolved in the computational implementation of the model.The developed numerical procedure is based on a mixed finiteelement technique. The number of dofs per node changesaccording with the number of fiber bundles simulated in thecomposite. Then, a specific solution scheme is proposed tosolve the variable number of unknowns in the discrete model.