Dynamic fracture of concrete – compact tension specimen

Ožbolt, Joško; Sharma, Akanshu; Reinhardt, Hans‐Wolf

doi:10.1016/j.ijsolstr.2011.01.033

Cited by 128 publications

(82 citation statements)

References 22 publications

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“…Figure 5). This tendency is also observed in Ožbolt et al [25] where a similar test is studied. The injection of weak and strong discontinuities in combination with the Crack Path Field (CPF) tracking algorithm automatically captures branching phenomena without the need for a special strong discontinuity kinematics at the branched element as proposed in [16].…”

Section: Dynamic Simulations Of Quasi-brittle Fracture At Different Lsupporting

confidence: 80%

“…The Rayleigh wave speed v R for a concrete material is considered approximately equal to 2100 m/s (cf. [25]). …”

Section: Dynamic Simulations Of Quasi-brittle Fracture At Different Lmentioning

confidence: 99%

“…between 500 and 600 m/s for concrete material [25], G f stands for the material fracture energy and k denotes the considered bandwidth of the localization zone in the DDM (cf. [18,23]).…”

Section: Injection Patternsmentioning

confidence: 99%

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Crack Path Field and Strain Injection Techniques in Dynamic Fracture Simulations

Lloberas-Valls¹,

Huespe²,

Oliver³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. Dynamic fracture phenomena are studied employing low cost computational tools based on Finite Elements with Embedded strong discontinuities (E-FEM). Fracture nucleation and propagation are accounted for through the injection of discontinuous strain and displacement modes inside the finite elements. The Crack Path Field technique is employed to compute the trace of the strong discontinuity during fracture propagation.Unstable crack propagation and crack branching are observed upon increasing loading rates. The variation in terms of crack pattern and energy dissipation is studied and a good correlation is found between the maximum experimental crack speed and maximum dissipation at the onset of branching. Comparable results are obtained against simulations employing supraelemental techniques, such as phase-field and gradient damage models, considering coarser discretizations which can differ by two orders of magnitude.

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Section: Dynamic Simulations Of Quasi-brittle Fracture At Different Lsupporting

confidence: 80%

“…The Rayleigh wave speed v R for a concrete material is considered approximately equal to 2100 m/s (cf. [25]). …”

Section: Dynamic Simulations Of Quasi-brittle Fracture At Different Lmentioning

confidence: 99%

See 1 more Smart Citation

Crack Path Field and Strain Injection Techniques in Dynamic Fracture Simulations

Lloberas-Valls¹,

Huespe²,

Oliver³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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show abstract

“…There exists a vast literature on the subject Cadoni et al 2001;Camacho and Ortiz 1996;Deshpande and Evans 2008;Doyoyo 2002;Ferri et al 2010;Forquin et al 2008;Frank et al 2012;Gailly and Espinosa 2002;Gatuingt and Pijaudier-Cabot 2002;Grady 1982;Grady 1998;Grady and Kipp 1979;Grady and Kipp 1995;Grady 1990;Kožar and Ožbolt 2010;Mescall and Weiss 1984;Mott 1947;Ožbolt et al 2011;Shih et al 1998;Wei et al 2009) and many aspects are well understood, including the micro-mechanics of dynamic propagation and branching of individual cracks (Freund 1990). …”

Section: Introductionmentioning

confidence: 99%

Viscous energy dissipation of kinetic energy of particles comminuted by high-rate shearing in projectile penetration, with potential ramification to gas shale

Bažant

Zhao

et al. 2015

Int J Fract

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While dynamic comminution is of interest to many processes and situations, this work is focused on the projectile impact onto concrete walls, in which predictions have been hampered by the problem of the so-called 'dynamic overstress'. Recently, in analogy with turbulence, Bažant and Caner modeled the overstress as an additional viscous stress generated by apparent viscosity that accounts for the energy dissipation due to kinetic comminution of concrete into small particles at very high shear strain rate. Their viscosity estimation, however, was approximate since it did not satisfy the energy balance exactly. Here their model is extended and refined by ensuring that the drop of local kinetic energy of high shear strain rate of form- ing particles must be exactly equal to the energy dissipated by interface fracture of these particles. The basic hypothesis is that the interface fracture occurs instantly, as soon as the energy balance is satisfied. Like in the preceding work, this additional apparent viscosity is a power function of the rate of the deviatoric strain invariant. But here the power exponent is different, equal to −7/3, and the apparent viscosity is found to be proportional also to the time derivative of the rate of that invariant, i.e., to the second derivative of the shear strain. It is assumed that the interface fracture that comminutes the material into small particles occurs instantly, as soon as the local kinetic energy of shear strain rate in the forming particles becomes equal to the energy required to form interface fractures. The post-comminution behavior, including subsequent further comminution and clustering into bigger particle groups to release the kinetic energy that is being dissipated by inter-group friction, is discussed and modeled. The present formulation makes it possible to eliminate the artificial damping of all types, which is normally embedded in commercial finite element codes but is not predictive since it is not justified physically. With the aforementioned improvements, and after implementation into the new microplane model M7 for fracturing damage in concrete (which includes the quasi-static rate effects), the finite element predictions give superior agreement with the measured exit velocities of steel projectiles penetrating concrete walls of different thicknesses and with the measured depths of penetration into concrete blocks by projectiles of different veloci-123 78 Y. Su et al. ties. Finally it is pointed out that the theory presented may also be used to predict proximate fragmentation and permeability enhancement of gas shale by powerful electric pulsed-arc explosions in the borehole.

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“…As it has been shown in several experimental [10][11][12][13], theoretical [14][15] and numerical [16][17][18][19] studies, the loading rate significantly influences the resistance and failure mode of concrete structures in a way that the strength of concrete may become more than that of quasi-static in case of high strain-rates caused by high velocity loading such as impacts.…”

mentioning

confidence: 99%

Multi-Laminate Rate-Dependent Modelling of Static and Dynamic Concrete Behavior through Damage Formulation

Sadrnejad

Hoseinzadeh

2017

Scientia Iranica

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Mathematical simulation of the nonlinear tri-dimensional mechanical behavior of quasi-brittle materials like concrete is one of the biggest challenges in the engineering science. It is vital to have the knowledge of the response of concrete specimens subjected to low and high strain rate deformation for the analysis of concrete structures under the static and dynamic loading cases. The behavior of this material is generally known to be strain rate sensitive. Among phenomena of different orientation, the multi plane models, like multi-laminate models using a constitutive equation in a vectorial form rather than tensorial form by means of capturing interactions, can meet this goal adequately. This paper suggests a robust rate dependent damage based model in the multi-planes framework accomplished with minimum parameters for calibration and appropriate for engineering purposes. This damage formulation has been built on the basis of two types of essential damage, axial damage and shear damage, that basically can happen on each sampling plane and based on this concept two new axial and shear damage functions are proposed. Model verification has been studied under different compressive and tensile loading rates, comparing the results of the proposed model with the experimental data and Mohr-Coulomb failure criterion envelope line.

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Dynamic fracture of concrete – compact tension specimen

Cited by 128 publications

References 22 publications

Crack Path Field and Strain Injection Techniques in Dynamic Fracture Simulations

Crack Path Field and Strain Injection Techniques in Dynamic Fracture Simulations

Viscous energy dissipation of kinetic energy of particles comminuted by high-rate shearing in projectile penetration, with potential ramification to gas shale

Multi-Laminate Rate-Dependent Modelling of Static and Dynamic Concrete Behavior through Damage Formulation

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