Reduced Order Multiscale Simulation of Diffuse Damage in Concrete

Materials

Christoph Gehlen¹  Fabian Diewald¹  Jithender J. Timothy²  Günther Meschke²  Giao Vu² 

[1] Chair of Materials Science and Testing, Centre for Building Materials, Technical University of Munich, Franz-Langinger-Strasse 10, 81245 Munich, Germany;Institute for Structural Mechanics, Ruhr University Bochum, Universitaetsstrasse 150, 44801 Bochum, Germany;

关键词: concrete;    mesoscale;    reduced order multiscale simulation;    microcracking;    micromechanics;    linear elastic fracture mechanics;   

DOI  :  10.3390/ma14143830

来源: DOAJ

【 摘 要 】

Damage in concrete structures initiates as the growth of diffuse microcracks that is followed by damage localisation and eventually leads to structural failure. Weak changes such as diffuse microcracking processes are failure precursors. Identification and characterisation of these failure precursors at an early stage of concrete degradation and application of suitable precautionary measures will considerably reduce the costs of repair and maintenance. To this end, a reduced order multiscale model for simulating microcracking-induced damage in concrete at the mesoscale level is proposed. The model simulates the propagation of microcracks in concrete using a two-scale computational methodology. First, a realistic concrete specimen that explicitly resolves the coarse aggregates in a mortar matrix was generated at the mesoscale. Microcrack growth in the mortar matrix is modelled using a synthesis of continuum micromechanics and fracture mechanics. Model order reduction of the two-scale model is achieved using a clustering technique. Model predictions are calibrated and validated using uniaxial compression tests performed in the laboratory.

【 授权许可】

Unknown