Dynamic fracture of concrete compact tension specimen: Experimental and numerical study

Ožbolt, Joško; Bošnjak, Josipa; Sola, Emiliano

doi:10.1016/j.ijsolstr.2013.08.030

Cited by 118 publications

(86 citation statements)

References 12 publications

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“…Osnovni je tome razlog to što pod dinamičkim opterećenjem odziv materijala (betona) postaje ovisan o brzini deformiranja (eng. rate sensitivity) te dolazi do pojave inercijalnih učinaka različitoga podrijetla, [1][2][3]. Numeričke i eksperimentalne studije pokazuju da s porastom brzine opterećenja dolazi do porasta nosivosti.…”

Section: Uvodunclassified

Numerical analysis of the dynamically impacted concrete beam: influence of impact surface

Bede¹

2017

Zajednički Temelji 2017 - Peti Skup Mladih Istraživača Iz Područja Građevinarstva I Srodnih Tehničkih Znanosti - Zbornik Radova

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SažetakPoznato je da ponašanje betonskih konstrukcija uvelike ovisi o brzini nanošenja opterećenja. Numeričke i eksperimentalne studije pokazuju da s porastom brzine opterećenja (brzine deformacije) dolazi do povećanja nosivosti, promjene oblika sloma, distribucije pukotine i brzine širenja pukotine. U radu je prikazan numerički model betonske grede sa zarezom izložene udarnom opterećenju pri različitim brzinama opterećenja. Glavni je cilj rada istražiti utjecaj udarne površine na slom betona, pojavu i razvoj pukotine. Stoga je provedena parametarska studija utjecaja veličine i oblika kontaktne površine udarnoga čekića na ponašanje betona zbog dinamičkog opterećenja. Provedena numerička analiza potvrdila je da veličina i oblik kontaktne površine udarnoga tijela pri većim brzinama opterećenja utječe na mehanizam sloma i smjer širenja pukotine (strukturalni efekt).Ključne riječi: slom betona, dinamičko opterećenje, brzina opterećenja, metoda konačnih elemenata, oblik sloma, račvanje pukotine Numerical analysis of the dynamically impacted concrete beam: influence of impact surface AbstractBehaviour of concrete structures is known to be strongly influenced by loading rate (strain rate). Numerical and experimental studies show that the increase in loading rate generates an increase in resistance, change of failure mode and crack pattern, and crack propagation velocity. A numerical model of the dynamically impacted notched concrete beam subjected to different loading rates is presented in this paper. The main objective of this study is to investigate influence of impact surface on concrete fracture, crack initiation and propagation.For that purpose, a parametric study is conducted to investigate the influence of the size and shape of the impactor contact surface on concrete behaviour when subjected to dynamic load. The numerical study has confirmed that the size and shape of the impactor contact surface affects the failure mechanism and crack propagation (structural effect) under higher dynamic loads.

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Section: Uvodunclassified

Numerical analysis of the dynamically impacted concrete beam: influence of impact surface

Bede¹

2017

Zajednički Temelji 2017 - Peti Skup Mladih Istraživača Iz Područja Građevinarstva I Srodnih Tehničkih Znanosti - Zbornik Radova

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“…In the study two different types of standard solid finite elements are used, eightnode linear strain elements and four-node constant strain elements. The analysis is carried out for the CT specimen, which was recently experimentally tested for different loading rates [6]. The geometry of the specimen and the test set-up is shown Fig.…”

Section: Mesh Sensitivity Studymentioning

confidence: 99%

“…4. More details related to the experimental tests can be found in [6]. In numerical pre-and post-test numerical studies [3,7] the finite element analysis was carried out using explicit finite element code based on the rate sensitive microplane model.…”

Section: Mesh Sensitivity Studymentioning

confidence: 99%

Dynamic Fracture of Concrete Compact Tension Specimen: Mesh Sensitivity Study

Ruta

Ožbolt

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:It is well known that without a proper regularization scheme the finite element analysis of softening materials leads to mesh dependent response. The results of the analysis should be as less as possible dependent on the choice of the finite element type and on the finite element discretization. In the present article the mesh sensitivity study of the compact tension specimen loaded under quasi-static and dynamic loading conditions is carried out. It is shown that relatively simple regularization scheme based on the element size independent energy dissipation (crack band method) leads to mesh insensitive results. In the analysis the constitutive law based on the rate sensitive microplane model for concrete is used. In the model the tensile response is based on the bi-linear crack-opening softening law. It is shown that, in spite of the simple regularization scheme, the rate dependent peak load, failure mode, crack branching and crack velocity are realistically predicted for different types and sizes of finite elements.

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“…Elastic modulus of elasticity (E) was calculated by the recommendation of RILEM [10] from Hook's Law (1) from stress-strain diagram.…”

Section: Evaluation Of L-cod Diagramsmentioning

confidence: 99%

“…Different experimental test set-ups have been used as bending test on notched cylindrical halves (semicircular bend, see [3]) but also as disk-shaped compact tension specimens with two holes for placing the pins, see [18]. Another approach for applying the splitting load to the specimen is proposed in [10] where two steel loading frames were applied instead of two holes for pins, although on a cubic shaped CT specimen. Cifuentes et al recently postulated the study of the applicability of MCT specimen for measuring the fracture energy of concrete that indicates very promising consistency of the specific fracture energy value for different widths and notch depths, were also the comparison of the MCT test with the traditional fracture test 3PB were carried out, see in [2] The aim of this contribution is to compare the data obtained from standard compression test performed on 150 × 300 mm cylinders in the laboratory of Faculty of Civil Engineering Brno University of Technology with those obtained from the modified compact tension test performed in the laboratory of the University of Oviedo.…”

Section: Introductionmentioning

confidence: 99%

Influence Of The Gripping Fixture On The Modified Compact Tension Test Results: Evaluation Of The Experiments On Cylindrical Concrete Specimens

Holušová¹,

Lozano²,

Fernández‐Canteli³

et al. 2015

Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series.

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The modified compact tension test (MCT) might become in the future a stable test configuration for the evaluation of fracture-mechanics parameters or also for description of fatigue behavior of composites materials such as concrete. Core drilling is used for sampling of existing structures. These samples have cylindrical shape with the selected thickness to avoid the stress concentration. This contribution focuses on the evaluation of the fracture behavior during static and quasi static tests. Static tests are performed on standard specimen with diameter 150 mm and length 300 mm. The quasi-static tests are performed using two different gripping fixtures. The results for quasi-static tests are represented as L-COD diagrams (i.e. load vs. crack opening displacement) measured on the loading axis. The comparison of results and discussion of advantages and disadvantages are introduced.

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Dynamic fracture of concrete compact tension specimen: Experimental and numerical study

Cited by 118 publications

References 12 publications

Numerical analysis of the dynamically impacted concrete beam: influence of impact surface

Numerical analysis of the dynamically impacted concrete beam: influence of impact surface

Dynamic Fracture of Concrete Compact Tension Specimen: Mesh Sensitivity Study

Influence Of The Gripping Fixture On The Modified Compact Tension Test Results: Evaluation Of The Experiments On Cylindrical Concrete Specimens

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