Elemente der Werkstoffformulierung für Beton und deren Verwendung in der Kurzzeitdynamik

Schuler, Harald

doi:10.1002/best.200700581

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Considering the maximum load for the other rates, the well‐known DIF‐curve for reaction forces is shown in Figure , where the results documented in literature and those from the simulations are illustrated. As documented in Reference , the literature results are taken from various authors that tested concrete structures at different loading rates using setups such as explosion tests, spallation tests, direct tensile tests, Split Hopkinson tests, and so on. It is clear from the graph that at high‐loading rates, the strength increases rapidly.…”

Section: Numerical Examplesmentioning

confidence: 99%

Variational eigenerosion for rate‐dependent plasticity in concrete modeling at small strain

Qinami

Pandolfi

Kaliske

2019

Numerical Meth Engineering

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Summary In the context of eigenfracture scheme, the work at hand introduces a variational eigenerosion approach for inelastic materials. The theory seizes situations where the material accumulates large amounts of plastic deformations. For these cases, the surface energy entering the energy balance equation is rescaled to favor fracture, thus energy minimization delivers automatically the crack‐tracking solution also for inelastic cases. The minimization approach is sound and preserves the mathematical properties necessary for the Γ‐limit proof, thus the existence of (local) minimizers is guaranteed by the Γ‐convergence theory. Although it is not possible to demonstrate that the obtained minimizers are global, satisfactory results are obtained with the local minimizers provided by the method. Furthermore, with the goal of addressing the constitutive behavior of concrete, a Drucker‐Prager viscoplastic consistency model is introduced in the microplane setting. The model delivers a rate‐dependent three‐surface smooth yield function that requires hardening and hardening‐rate parameters. The independent evolution of viscoplasticity in different microplanes induces anisotropy in the mechanical response. The sound performance of the model is illustrated via numerical examples for both rate‐independent and rate‐dependent plasticity.

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Section: Numerical Examplesmentioning

confidence: 99%

Variational eigenerosion for rate‐dependent plasticity in concrete modeling at small strain

Qinami

Pandolfi

Kaliske

2019

Numerical Meth Engineering

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“…The curing regime was not specified, although Fehling et al (2005) describes curing regimes used in previous research at the University of Kassel. SHPB experimentation was conducted according to the methods established by Schuler (Schuler 2004;Schuler and Hansson 2006;. All specimens were cylinders 3 in.…”

Section: Dynamic Tensile Strengthmentioning

confidence: 99%

“…Their experimental values and calculated DIFs are reported in Table 13. As noted above, tests were performed using an SHPB, with methods previously described by Schuler (Schuler 2004;Schuler and Hansson 2006;).…”

Section: Fracture Energymentioning

confidence: 99%

Advanced cementitious materials for blast protection

Groeneveld¹,

Crane²

2023

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Advanced cementitious materials, commonly referred to as ultra-high performance concretes (UHPCs), are developing rapidly and show promise for civil infrastructure and protective construction applications. Structures exposed to blasts experience strain rates on the order of 102 s-1 or more. While a great deal of research has been published on the durability and the static properties of UHPC, there is less information on its dynamic properties. The purpose of this report is to (1) compile existing dynamic property data—including compressive strength, tensile strength, elastic modulus, and energy absorption—for six proprietary and research UHPCs and (2) implement a single-degree-of-freedom (SDOF) model for axisymmetric UHPC panels under blast loading as a means of comparing the UHPCs. Although simplified, the model allows identification of key material properties and promising materials for physical testing. Model results indicate that tensile strength has the greatest effect on panel deflection, with unit weight and elastic modulus having a moderate effect. CEMTECmultiscale® deflected least in the simulation. Lafarge Ductal®, a commonly available UHPC in North America, performed in the middle of the five UHPCs considered.

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“…(8) und Bild 14), die sowohl die Dehnrateneffekte F Rate für Zugbeanspruchungen nach Malvar et al [31] (Gln. (9) (10)), als auch die dynamische Entfestigungshypothese (Abschn.…”

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Hochdynamische Materialeigenschaften von Ultrahochleistungsbeton (UHPC)

Nöldgen

Millon

Thoma

et al. 2009

Beton und Stahlbetonbau

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Material Properties of Ultra High Performance Concrete (UHPC) at High Strain Rates The presented paper is a contribution to the material description of Ultra High Performance Concrete (UHPC) under high-speed dynamical loading conditions. Based on a series of Hopkinson-Bar experiments dynamical material parameters such as the Tensile Strength, Young's Modulus and Fracture Energy are derived at high strain rates of 10(2). s(-1). A comparison with the results of these parameters for normal and high strength concrete leads to a qualitative and quantitative evaluation of UHPC at high strain rates. With the extension of the established RHT material model for UHPC by the material's Fracture Energy and Stress-Crack-Opening-Relation the Hopkinson-Bar experiments are simulated appropriately

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Elemente der Werkstoffformulierung für Beton und deren Verwendung in der Kurzzeitdynamik

Cited by 4 publications

References 9 publications

Variational eigenerosion for rate‐dependent plasticity in concrete modeling at small strain

Variational eigenerosion for rate‐dependent plasticity in concrete modeling at small strain

Advanced cementitious materials for blast protection

Hochdynamische Materialeigenschaften von Ultrahochleistungsbeton (UHPC)

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