Publication

Modeling of viscoelastic properties of Ultra High Performance Fiber Reinforced Concrete (UHPFRC) under low to high tensile stresses

Eugen Brühwiler, Emmanuel Denarié
2010
Conference Papers

Abstract

The purpose of this paper is to explore the UHPFRC time-dependent behavior under sustained tensile loading at very early age (3 days) and to highlight its sensitivity to the level of loading by laboratory testing and numerical analysis. Uniaxial creep and relaxation tests were performed at 3 days age at various stress levels by means of a Temperature-Stress Testing set-up (TSTM). Under low tensile stresses, the material exhibits a linear viscoelastic behavior. Under high tensile stresses the creep response becomes non-linear. A numerical algorithm was used to convert the creep results into relaxations and compare them with measured relaxations. A generalized Maxwell chain model was applied to predict the UHPFRC tensile relaxations at a low load level.

Official source

https://infoscience.epfl.ch/entities/publication/0d2a9f89-4b55-4137-81a1-0b8ac0eaa8f4

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Eugen Brühwiler, Emmanuel Denarié
2010
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/0d2a9f89-4b55-4137-81a1-0b8ac0eaa8f4

About this result

Related concepts (32)

Viscoelasticity

In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Elastic materials strain when stretched and immediately return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain.

Tensile testing

Tensile testing, also known as tension testing, is a fundamental materials science and engineering test in which a sample is subjected to a controlled tension until failure. Properties that are directly measured via a tensile test are ultimate tensile strength, breaking strength, maximum elongation and reduction in area. From these measurements the following properties can also be determined: Young's modulus, Poisson's ratio, yield strength, and strain-hardening characteristics.

Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load.

Related publications (27)

Modeling of viscoelastic properties of Ultra High Performance Fiber Reinforced Concrete (UHPFRC) under low to high tensile stresses

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