Modeling 3D crack propagation in unreinforced concrete using PUFEM
2005 (English)In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 194, no 25-26, 2859-2896 p.Article in journal (Refereed) Published
Concrete is a quasi-brittle material, where tensile failure involves progressive micro-cracking, debounding and other complex irreversible processes of internal damage. Strain-softening is a dominate feature and advanced numerical schemes have to be applied in order to circumvent the ill-posdness of the Boundary-Value Problem to deal with. Throughout the paper we pursue the cohesive zone approach, where initialization and coalescence of micro-cracks is lumped into the cohesive fracture process zone in terms of accumulation of damage. We develop and employ a (discrete) constitutive description of the cohesive zone, which is based on a transversely isotropic traction separation law. The model reflects an exponential decreasing traction with respect to evolving opening displacement and is based on the theory of invariants. Non-negativeness of the damage dissipation is proven and the associated numerical embedded representation is based on the Partition of Unity Finite Element Method. A consistent linearization of the method is presented, where particular attention is paid to the (cohesive) traction terms. Based on the proposed concept three numerical examples are studied in detail, i.e. a double-notched specimen under tensile loading, a four point shear test and a pull-out test of unreinforced concrete. The computational results show mesh-independency and good correlation with experimental results. © 2004 Elsevier B.V. All rights reserved.
Place, publisher, year, edition, pages
2005. Vol. 194, no 25-26, 2859-2896 p.
3D crack propagation, unreinforced concrete, PUFEM, finite-element-method, strong discontinuity approach, failure analysis, brittle-fracture, level sets, localization, growth, damage, plasticity, continuity
IdentifiersURN: urn:nbn:se:kth:diva-14742DOI: 10.1016/j.cma.2004.07.025ISI: 000229061700007OAI: oai:DiVA.org:kth-14742DiVA: diva2:332783
QC 201005252010-08-052010-08-05Bibliographically approved