Lattice models applied to cyclic behavior description of quasi‐brittle materials: advantages of implicit integration. (6th December 2014)

• Record Type: Journal Article
• Authors: Vassaux, M.; Richard, B.; Ragueneau, F.; Millard, A.; Delaplace, A.
• Is Part Of: International journal for numerical and analytical methods in geomechanics. Volume 39:Number 7(2015)
• Page Start: 775
• Page End: 798
• Publication Date: 2014-12-06
• Subjects: Soil mechanics -- Mathematics -- Periodicals; Rock mechanics -- Mathematics -- Periodicals; 624.1510151
• DOI: 10.1002/nag.2343
• Languages: English
• ISSNs: 0363-9061

Abstract

<abstract abstract-type="main" id="nag2343-abs-0001"> <title>Summary</title> <p id="nag2343-para-0001">Comprehension and quantification of quasi‐brittle materials behavior require complex experiments when focusing on cyclic or multi‐axial loadings. As an alternative, virtual testing, which can be computed using lattice discrete elements models (LDEM), is particularly interesting. LDEM already provide a physical description of the quasi‐brittle materials behavior, but further attention has to be paid to numerical integration. LDEM are explicitly integrated, such integration has been proven in the literature to be accurate when cracking is involved, by means of efficient schemes such as the 'Saw‐tooth' algorithm. In order to extend the range of application of the LDEM to more complex loading paths, such as compressive or cyclic loadings, involving contact and friction mechanisms, qualitativeness as well as quantitativeness of explicit integration has to be assessed anew. We hereby propose an implicit quasi‐static integration scheme for LDEM based on specific non‐linearities encountered in quasi‐brittle materials, namely contact and fracture, to circumvent expected stability and accuracy issues. Efficiency of both schemes is investigated by means of simulations of a uniaxial cyclic test and a compression test. Copyright © 2014 John Wiley &amp; Sons, Ltd.</p> </abstract>