Simulation of Dynamic Fracture of Concrete with Damaged Viscoelasticity and Retarded Damage

Häußler‐Combe, Ulrich; Panteki, Evmorfia; Kühn, Tino; Quast, Matthias

doi:10.21012/fc9.091

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…The post-peak phase before the residual phase seems to depend on the failure of the filaments in the embedded length or in the free length. In accordance with Häußler-Combe et al., 12 it is explained by the fact that, in the first phase of the pull-out test (loading and failure), the bond between the filaments and the matrix is an adhesive bond, whereas in the second phase (extraction phase), this bond is based on frictional forces.…”

Section: Resultssupporting

confidence: 72%

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Study of the pull-out test of multifilament yarns embedded in cementitious matrix

Slama

Gallias

Fiorio

2020

Journal of Composite Materials

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In order to understand the impregnation mechanism of a yarn by a cementitious matrix and its influence on the mechanical properties of a yarn/cement composite, pull-out tests have been performed on samples of yarn/cement. Two embedded lengths for the yarn and different rheological and mechanical properties for the matrix were tested. Two pull-out modes were distinguished according to the compressive strength of matrices. For matrices with a compressive strength between 60 and 70 MPa the pull-out mode is characterized by a behaviour close to the tensile behaviour of the yarn, with maximum load values reaching approximately 60% of the tensile maximum load because of filaments damages. For matrices with compressive strength inferior to 60 MPa, the pull-out mode exhibits a residual phase linked to a slippage and an extraction of a variable number of filaments, with lower maximum load values than the first pull-out mode. After pull-out test, for some samples with filaments extraction, an innovative method based on a double impregnation with resin enables to visualize the yarn/matrix interface and identify the level of impregnation of the filaments by using confocal microscopy. It is concluded that this level of impregnation has a direct influence on the mechanical behaviour of the embedded yarn, except for the slippage and extraction phase, but the rheological properties of the matrix has no significant influence on this impregnation.

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Section: Resultssupporting

confidence: 72%

“…10,11 Besides the heterogeneity of the matrix due to the wide size of distribution of its particles, the yarn also exhibits an important heterogeneity because it is made of thousands of flexible filaments, bonded together with a sizing which does not ensure strong cohesion between the filaments and allows their waviness. 12,13…”

Section: Introductionmentioning

confidence: 99%

Study of the pull-out test of multifilament yarns embedded in cementitious matrix

Slama

Gallias

Fiorio

2020

Journal of Composite Materials

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“…The tensile stress-strain response of TRC composites is conventionally represented by three distinct zones [9,10]. The initial phase-Zone I-pertaining to the linear response, is governed by the stiffness of the matrix, until first cracking.…”

Section: Introductionmentioning

confidence: 99%

Engineering the Tensile Response of Glass Textile Reinforced Concrete for Thin Elements

Paul,

Gettu

2023

Sustainability

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Textile-reinforced concrete (TRC) is a composite made with bi-directional non-metallic fabric embedded in a fine-grained cementitious matrix. When engineered appropriately, these composites can reduce material usage for the desired performance, resulting in slimmer sections and enhanced material efficiency, which in turn lowers the CO2 footprint. To facilitate the widespread application of TRC in practice, it is crucial to comprehend the material and structural behavior of these composites, which can pave the way toward an optimized design methodology. In this paper, the tensile response of TRC is studied with different textile geometries, volume fractions and matrix strengths. The influence of the coating impregnation on the effectiveness of the textile to enhance the response of the composite is discussed, with complementing evidence from microstructural observations. The results of tests with different textile configurations indicate a transition in the type of stress–strain response from tri-linear to bi-linear, beyond a certain effective volume fraction. The paper also presents a simplified model to predict the bi-linear response from the efficiency factor-based approach. The insights gained can assist in achieving composite designs with optimized sections and limited tensile stress cracking, ensuring the targeted performance in slender elements.

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“…) bis hin zu experimentellen und numerischen Materialuntersuchungen unter dynamischen Beanspruchungen (vgl. ). Neben dem rein statischen Verhalten offenbaren diese Strukturen bei schnelleren Beanspruchungen unterschiedliche Versagensmechanismen, die es systematisch herauszuarbeiten und zu beschreiben gilt.…”

Section: Introductionunclassified

Dynamisches Verhalten von Stahlbetonplatten

Hering

Kühn

Häntzschel

et al. 2019

Beton und Stahlbetonbau

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Nur eine einzige Chance gab es, im Rahmen einer Kooperation mit der Bundeswehr dem Interesse der Wissenschaft beim Ansprengen von Betonplatten nachzugehen. Neben vielen durchgeführten Fall‐ und Beschussversuchen im Otto‐Mohr‐Laboratorium in Dresden nutzten die Autoren die Gelegenheit eines Feldversuchs unter ähnlichen Bedingungen wie im Labor. Hierzu wurden der Probekörper sowie die gesamte Mess‐ und Versuchstechnik kurzerhand auf einen Übungsplatz der Bundeswehr transportiert. Die Bedienung des ansonsten autarken Messsystems erfolgte aus einem sicheren Bunker in 300 m Entfernung, was eine zusätzliche Herausforderung darstellte. Es wurden Lagerkräfte, Beschleunigungen und Verschiebungen gemessen. Außerdem wurden High‐Speed‐Aufnahmen aufgezeichnet. Die Beanspruchung erfolgte mit 0,75 kg PETN mit einem TNT‐Äquivalent (TNTe) von ca. 1 kg. Im Beitrag wird die experimentelle Vorgehensweise detailliert dargelegt. Im Bewusstsein, mit dieser Beanspruchungsart Neuland zu betreten, werden Fehler offen benannt und die Methodik kritisch hinterfragt. In einem nachfolgenden Artikel wird auf die numerische Betrachtung des hier rein experimentell beschriebenen Versuchs eingegangen.

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Simulation of Dynamic Fracture of Concrete with Damaged Viscoelasticity and Retarded Damage

Cited by 4 publications

References 4 publications

Study of the pull-out test of multifilament yarns embedded in cementitious matrix

Study of the pull-out test of multifilament yarns embedded in cementitious matrix

Engineering the Tensile Response of Glass Textile Reinforced Concrete for Thin Elements

Dynamisches Verhalten von Stahlbetonplatten

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