Publication

Modelling of the combined effect of strain rate and temperature on one-dimensional compression of soils

Lyesse Laloui
2008
Journal Articles

Résumé

Strain rate and temperature have important effects on the behaviour of soils. The present paper enhances the thermo-viscoplastic modelling of soils by taking advantage of the most recent understanding of the effects of temperature and strain rate on soils. In particular, modelling of the evolution of the vertical yield stress at any void ratio is made possible with the use of an advanced model for the dependence of vertical yield stress on temperature, as well as the use of the unique effective stress-strain-strain rate concept. The first part of the paper presents an overview of the experimental and constitutive theoretical works performed on the effects of strain rate and temperature. The second part describes a strain-rate and temperature coupled model, and the third part deals with the numerical validation of the proposed model.

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https://infoscience.epfl.ch/entities/publication/cc7ac729-7975-4519-b735-39343b98f454

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Lyesse Laloui
2008
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/cc7ac729-7975-4519-b735-39343b98f454

À propos de ce résultat

Concepts associés (22)

Strain-rate tensor

In continuum mechanics, the strain-rate tensor or rate-of-strain tensor is a physical quantity that describes the rate of change of the deformation of a material in the neighborhood of a certain point, at a certain moment of time. It can be defined as the derivative of the strain tensor with respect to time, or as the symmetric component of the Jacobian matrix (derivative with respect to position) of the flow velocity. In fluid mechanics it also can be described as the velocity gradient, a measure of how the velocity of a fluid changes between different points within the fluid.

Stress–strain curve

In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.

Vitesse de déformation

En mécanique des milieux continus, on considère la déformation d'un élément de matière au sein d'une pièce. On s'attache donc à décrire ce qui se passe localement et non pas d'un point de vue global, et à utiliser des paramètres indépendants de la forme de la pièce. La vitesse de déformation que l'on considère est donc la dérivée par rapport au temps de la déformation ε ; on la note donc (« epsilon point ») : Elle s'exprime en s−1, parfois en %/s. C'est un des paramètres capitaux en rhéologie.

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