High-fidelity prediction of crack formation in 2D and 3D pullout tests

Benedetti, Lorenzo; Cervera, Miguel; Chiumenti, Michele

doi:10.1016/j.compstruc.2016.05.001

Cited by 19 publications

(15 citation statements)

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“…Interface problems, either, free-surface [5,6], a thermally coupled analysis considering phase-change [7,8], or even, solid mechanics problems with stresses location, damage or plasticity [9,10,11], are promising cases where the use of adaptivity is relevant because thin layers of the full domain contains the most important information of the global behavior of the problem. In this work an adaptive xed-mesh ALE method is used to numerically approximate the sloshing of a rectangular tank partially lled with a domestic oil subjected to a controlled movement generated by a shake table.…”

Section: Introductionmentioning

confidence: 99%

An oil sloshing study: adaptive fixed-mesh ALE analysis and comparison with experiments

et al. 2018

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This work reports an experimental and numerical analysis of the sloshing of a squared tank partially lled with a domestic vegetable oil. The tank is subjected to controlled motions with a shake table. The freesurface evolution is captured using two experimental techniques: ultrasonic sensors and an image capturing method. The data obtained using these two techniques are compared between them and used to conrm the measurements. Only conrmed data within the error range are reported. Filling depth, imposed amplitude and frequency eects on the sloshing wave pattern are specically evaluated. The experiments also reveal the nonlinear wave behavior. The material properties of the oil are also determined. The numerical model is based on a stabilized nite element method of the Variational Multi-Scale (VMS) type. The free-surface is captured using a level set technique particularly developed to be used with adaptive meshes in Arbitrary Eulerian Lagrangian reference frameworks. The experimental and numerical results are compared for dierent sloshing conditions near the rst sloshing mode. The simulations satisfactorily match the experiments, providing a reliable tool for the analysis of this kind of problems.

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Section: Introductionmentioning

confidence: 99%

An oil sloshing study: adaptive fixed-mesh ALE analysis and comparison with experiments

et al. 2018

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“…The boundary conditions, as demonstrated in [35], are crucial for the correct numerical analysis of the test. In the present case, the model constraints are recovered from photos to be as close as possible to the experimental setup.…”

Section: Prismatic Skew Notched Concrete Beam Under Torsionmentioning

confidence: 99%

“…Consequently, the characteristic length l ch is taken accordingly. Additional details of the models can be found in references [37] for the Drucker-Prager plasticity model, [35] for the Rankine plasticity model and [34,45,46] for the Rankine isotropic damage model. Figure 3, has a total length L = 260 mm, effectively supported span L e = 240 mm, by a thickness t = 10 mm and a total height w = 60 mm.…”

Section: Plasticity and Damage Modelsmentioning

confidence: 99%

“…In previous works [35,36,37], the nonlinear algebraic problem in equations (13a)-(13b) was solved in an incremental-iterative manner using the Newton-Raphson method.…”

Section: Algebraic Implementation Aspectsmentioning

confidence: 99%

“…Then, Cervera et al [32,33] generalized such concept with the introduction of the strain/displacement ε − u formulation. These formulations were capable to cope with strain softening problems involving isotropic damage [34], quasi-brittle tensile cracking [35], J2 [36] and pressure-dependent plasticity [37] without the need of auxiliary techniques.…”

Section: Introductionmentioning

confidence: 99%

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3D numerical modelling of twisting cracks under bending and torsion of skew notched beams

Benedetti

Cervera

Chiumenti

2017

Engineering Fracture Mechanics

Self Cite

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The testing of mode III and mixed mode failure is every so often encountered in the dedicated literature of mechanical characterization of brittle and quasi-brittle materials. In this work, the application of the mixed strain displacement ε − u finite element formulation to three examples involving skew notched beams is presented. The use of this FE technology is effective in problems involving localization of strains in softening materials.The objectives of the paper are: (i) to test the mixed formulation in mode III and mixed mode failure and (ii) to present an enhancement in terms of computational time given by the kinematic compatibility between irreducible displacement-based and the mixed strain-displacement elements.Three tests of skew-notched beams are presented: firstly, a three point bending test of a PolyMethyl MethaAcrylate beam; secondly, a torsion test of a plain concrete prismatic beam with square base; finally, a torsion test of a cylindrical beam made of plain concrete as well. To describe the mechanical behavior of the material in the inelastic range, Rankine and Drucker-Prager failure criteria are used in both plasticity and isotropic continuum damage formats.The proposed mixed formulation is capable of yielding results close to the experimental ones in terms of fracture surface, peak load and global loss of carrying capability. In addition, the symmetric secant formulation and the compatibility condition between the standard irreducible method and the strain-displacement one is exploited, resulting in a significant speedup of the computational procedure.

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On the seismic behaviour of monolithic lunar arches subjected to moonquakes

Kalapodis

Zalachoris

Ktenidou

et al. 2022

Earthq Engng Struct Dyn

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With a new era emerging in the field of lunar exploration and habitation, there is a need for research on structural forms made of local soil material (regolith), which will be able to endure the extreme conditions in harsh environments (e.g., extreme temperature fluctuations, solar and cosmic radiation, meteor showers, strong ground motions, etc.). The present work focuses on understanding the dynamic and seismic behaviour of certain structural typologies of monolithic arches by means of finite element analysis (FEA). These typologies were extensively investigated previously, using static analyses accounting for the reduced gravitational field on the moon, and proved to be of the optimum shape against certain loading scenarios. Specifically, these optimal monolithic arch forms (named enhanced varying-thickness arches -EVTAs) examined herewith, are described by varying-thickness geometry, properly enhanced at certain weak points for increasing their structural stability. Aiming at a fair comparison, the seismic behaviour of EVTAs is contrasted to that of their corresponding monolithic constant-thickness (CTAs) counterparts (having the same amount of structural material). After defining an appropriate damage state, the authors conduct preliminary pushover analyses to determine the structural capacity of the arches against lateral loading. Subsequently, the modal analysis of the EVTAs shows that the second/vertical mode exhibits a natural period almost equal to that of their first/translational mode and substantially longer than the corresponding second/vertical mode of their CTA counterparts, indicating a potential vulnerability along the vertical excitation. Furthermore, taking into account that shallow moonquakes are comparable to intraplate earthquakes in terms of hazard potential, the authors produce sets of stochastic seismic excitations used as time histories for seismic analyses. The probability of exceedance of the defined damage state as a function of the peak ground acceleration (PGA) is presented through indicative fragility curves, where the structural superiority of EVTAs against their CTA counterparts is demonstrated.

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High-fidelity prediction of crack formation in 2D and 3D pullout tests

Cited by 19 publications

References 50 publications

An oil sloshing study: adaptive fixed-mesh ALE analysis and comparison with experiments

An oil sloshing study: adaptive fixed-mesh ALE analysis and comparison with experiments

3D numerical modelling of twisting cracks under bending and torsion of skew notched beams

On the seismic behaviour of monolithic lunar arches subjected to moonquakes

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