Modeling of temperature- and rate-dependent fatigue behavior of concrete capturing the thermo-viscoplastic effects on material degradation

Modeling of temperature- and rate-dependent fatigue behavior of concrete capturing the thermo-viscoplastic effects on material degradation

Stať ve sborníku mimo WoS a Scopus

Concrete fatigue testing is costly and time-intensive, often requiring high loading frequencies to reduce durations, which impacts fatigue performance due to heat generation. This highlights the need for a robust model to capture the interaction between loading rate and temperature, aiding experimental interpretation and enabling faster testing—an area that is not yet addressed by current modeling approaches. This contribution aims to introduce a unified, thermodynamically-based constitutive model describing concrete behavior. The model integrates viscoplastic effects with cumulative sliding damage as mechanisms driving the material degradation. Additionally, the effect of temperature is integrated into the thermodynamic framework, coupled with viscoplastic strains, so that the intrinsic heat generation from internal friction is accounted for. Furthermore, Gibbs free energy-based formulation facilitates the stress-driven fatigue simulations at the single material point idealization. Elementary studies examining the behavior of concrete under uniaxial compression are used to analyze the effects of both loading-rate and thermal factors on both monotonic and fatigue behavior.

Concrete fatigue testing is costly and time-intensive, often requiring high loading frequencies to reduce durations, which impacts fatigue performance due to heat generation. This highlights the need for a robust model to capture the interaction between loading rate and temperature, aiding experimental interpretation and enabling faster testing—an area that is not yet addressed by current modeling approaches. This contribution aims to introduce a unified, thermodynamically-based constitutive model describing concrete behavior. The model integrates viscoplastic effects with cumulative sliding damage as mechanisms driving the material degradation. Additionally, the effect of temperature is integrated into the thermodynamic framework, coupled with viscoplastic strains, so that the intrinsic heat generation from internal friction is accounted for. Furthermore, Gibbs free energy-based formulation facilitates the stress-driven fatigue simulations at the single material point idealization. Elementary studies examining the behavior of concrete under uniaxial compression are used to analyze the effects of both loading-rate and thermal factors on both monotonic and fatigue behavior.

Concrete fatigue, Thermodynamics, Damage, Viscoplasticity, Temperature

Concrete fatigue, Thermodynamics, Damage, Viscoplasticity, Temperature

CHUDOBA, R.; VOŘECHOVSKÝ, M.; AGUILAR, M.; BAKTHEER, A.

23.04.2025

IA-FraMCoS

Vienna, Austria

978-3-903039-01-8

Proceedings of the 12th International Conference on Fracture Mechanics for Concrete and Concrete Structures

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https://framcos.org/FraMCoS-12/Full-Papers/1213.pdf