Modelling of concrete behaviour in uniaxial compression and tension with DEM

Nitka, Michał; Tejchman, J.

doi:10.1007/s10035-015-0546-4

Cited by 158 publications

(130 citation statements)

References 44 publications

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“…Force transmission bottlenecks, a subset of contacts that are prone to becoming overloaded beyond their capacity, can predict the location and pattern of the ultimate crack in the nascent stages of loading before damage initiates inside the specimen. The extent to which this data analytics technique can predict failure patterns in a range of multiphase concrete specimens and loading conditions (e.g., compression, 3-point bending tests [9,10]) will be reported in [11]. .…”

Section: Discussionmentioning

confidence: 99%

“…As discussed in [9], and illustrated in Figure 2, the tensile force bearing capacity α i j depends on the overlap U = U i j at the contact between the bonded spherical grains corresponding to nodes i and j:…”

Section: Methodsmentioning

confidence: 99%

“…We discuss here the data set from a discrete element (DEM) model of an unconfined concrete specimen, described as a random heterogeneous one-phase material, subjected to quasi-static, uni-axial tension [9]. A linear normal contact model under compression was used.…”

Section: Datamentioning

confidence: 99%

“…This study is part of a broader effort to investigate force transmission and failure in bonded granular media [9,10]. In contrast to unbonded grains [5], force transmission pathways in brittle or quasi-brittle bonded granular materials remain essentially fixed prior to fracture.…”

Section: Introductionmentioning

confidence: 99%

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Of cuts and cracks: data analytics on constrained graphs for early prediction of failure in cementitious materials

et al. 2017

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Abstract. Using data from discrete element simulations, we develop a data analytics approach using network flow theory to study force transmission and failure in a 'dog-bone' concrete specimen submitted to uniaxial tension. With this approach, we establish the extent to which the bottlenecks, i.e., a subset of contacts that impedes flow and are prone to becoming overloaded, can predict the location of the ultimate macro-crack. At the heart of this analysis is a capacity function that quantifies, in relative terms, the maximum force that can be transmitted through the different contacts or edges in the network. Here we set this function to be solely governed by the size of the contact area between the deformable spherical grains. During all the initial stages of the loading history, when no bonds are broken, we find the bottlenecks coincide consistently with, and therefore predict, the location of the crack that later forms in the failure regime after peak force. When bonds do start to break, they are spread throughout the specimen: in, near, and far from, the bottlenecks. In one stage leading up to peak force, bonds collectively break in the lower portion of the specimen, momentarily shifting the bottlenecks to this location. Just before and around peak force, however, the bottlenecks return to their original location and remain there until the macro-crack emerges right along the bottlenecks.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Of cuts and cracks: data analytics on constrained graphs for early prediction of failure in cementitious materials

et al. 2017

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“…There is no consensus on the strength of concrete and other brittle materials under multiaxial compression among researchers (Calvet 1969;Kupfer et al 1969;Leadbetter 1965;Raju 1971;Schickert & Winkler 1977;Stroeven 1973Huang et al 2015Nitka & Tejchman 2015;Linse & Kupfer 2013;Lim et al 2016;Van Mier & Van Vliet 2002;Tschegg et al 2015). Thus, in some studies, the 140 strength of materials under multiaxial compression did not differ from the strength under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Fracture of high performance materials under multiaxial compression and thermal effect

Shubin¹,

Zaitsev²,

Rimshin³

et al. 2017

10.5267/j.esm

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The article discusses the strength of concrete and other brittle materials in the case of nonuniform biaxial type of compression (σ1 > σ2 > 0) and triaxial compression of σ1 > σ2 = σ3 > 0 type (it was assumed that σ> 0 corresponds to compression). It is noted that, when considering the biaxial loading in the accepted model, probabilistic nature of distribution of stresses along the contour of pores and inclusions, i.e. stress causing formation and propagation of cracks in the material, plays an important role. Moreover, the stress across the circuit pores was regarded as a three-dimensional random field of S (α,β,γ,ω),where ω -is a random argument. Considering the average number of overshoots NR we believed that the random field of S is not homogeneous (not stationary): its expectation is not constant, but is a function of nonrandom arguments Мs = Мs(α;β;γ). External load, corresponding to NR = const (and at the same time constant of level exceedance probability), first increases and then decreases a little. Heating up to 300 о С (573K) and 400 о С (673K) leads to violations, and long-term load leads to significant changes in the macro-and microstructure of concrete.

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Effect of meso‐structure on strength and size effect in concrete under tension

Murali

Deb

2017

Num Anal Meth Geomechanics

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SummaryThe effect of heterogeneity in meso level geometric and material properties on tensile strength and size effect in split cylinder specimens is investigated. Critical meso geometric parameters are identified by studying their influence on the evolution of the fracture process zone. A statistical analysis is used to account for dependencies between the parameters. A reversal of the size effect, important for the strength of field specimens, is observed for certain meso geometries. Meso level explanations for this are proposed, and meso geometries likely to show such a reversal are identified. For moderately sized specimens, major trends in the size effect are seen to be almost entirely explained by heterogeneity in the meso geometry. KEYWORDS concrete, discrete element method, meso-structure, size effect

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Modelling of concrete behaviour in uniaxial compression and tension with DEM

Cited by 158 publications

References 44 publications

Of cuts and cracks: data analytics on constrained graphs for early prediction of failure in cementitious materials

Of cuts and cracks: data analytics on constrained graphs for early prediction of failure in cementitious materials

Fracture of high performance materials under multiaxial compression and thermal effect

Effect of meso‐structure on strength and size effect in concrete under tension

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