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Materials 2017, 10(2), 162;

Mesoscale Fracture Analysis of Multiphase Cementitious Composites Using Peridynamics

Durham College of Engineering, University of Georgia, Athens, GA 30602, USA
Author to whom correspondence should be addressed.
Received: 9 December 2016 / Accepted: 6 February 2017 / Published: 10 February 2017
(This article belongs to the Special Issue Numerical Analysis of Concrete using Discrete Elements)
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Concrete is a complex heterogeneous material, and thus, it is important to develop numerical modeling methods to enhance the prediction accuracy of the fracture mechanism. In this study, a two-dimensional mesoscale model is developed using a non-ordinary state-based peridynamic (NOSBPD) method. Fracture in a concrete cube specimen subjected to pure tension is studied. The presence of heterogeneous materials consisting of coarse aggregates, interfacial transition zones, air voids and cementitious matrix is characterized as particle points in a two-dimensional mesoscale model. Coarse aggregates and voids are generated using uniform probability distributions, while a statistical study is provided to comprise the effect of random distributions of constituent materials. In obtaining the steady-state response, an incremental and iterativesolverisadopted for the dynamic relaxation method. Load-displacement curves and damage patterns are compared with available experimental and finite element analysis (FEA) results.Although the proposed model uses much simpler material damage models and discretization schemes, the load-displacementcurvesshownodifferencefromtheFEAresults. Furthermore,nomeshrefinement is necessary, as fracture is inherently characterized by bond breakages. Finally, a sensitivity study is conducted to understand the effect of aggregate volume fraction and porosity on the load capacity of the proposed mesoscale model View Full-Text
Keywords: multiphaseconcrete;meshfree;fractureanalysis;state-basedperidynamics;non-ordinary mode multiphaseconcrete;meshfree;fractureanalysis;state-basedperidynamics;non-ordinary mode

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Yaghoobi, A.; Chorzepa, M.G.; Kim, S.S.; A., S. Mesoscale Fracture Analysis of Multiphase Cementitious Composites Using Peridynamics. Materials 2017, 10, 162.

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