Development of an orthotropic elastic-visco-plastic behaviour law for the thermomechanical modelling of refractory masonries - Archive ouverte HAL Access content directly
Conference Papers Year : 2023

Development of an orthotropic elastic-visco-plastic behaviour law for the thermomechanical modelling of refractory masonries

Abstract

Some refractory linings that protect metallic vessels from the hot temperature of the products they contain are made of masonries with dry joints (i.e. without mortar). The presence of these joints makes the behaviour of the masonry non-linear and orthotropic, allowing a free expansion during the first part of the temperature increase, reducing the stresses in the masonries. Since bricks have an elastic-visco-plastic behaviour at high temperature, it is necessary to develop an orthotropic elastic-visco-plastic behaviour law for the homogeneous material that has a behaviour equivalent to that of the brick and dry joint assembly. This non-linear behaviour is the origin of creep, that could be represented at the mesoscopic scale (brick and joint scale) by the well-known Norton-Bailey creep law. This law was in a previous study adapted to the macroscopic scale (masonry scale) for orthotropic secondary creep (with a constant creep strain rate). This study presents the adaptation of this law to primary creep for which the strain rate is not constant. The parameters of this new law are determined by a non-linear full-field homogenization technique. The identified law is then validated by comparing the results obtained by meso-modelling (bricks and joints are simulated) and macro-modelling (bricks and joints are replaced by the equivalent material) of an elementary periodic cell subjected to different loads.
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Dates and versions

hal-04444851 , version 1 (07-02-2024)

Identifiers

  • HAL Id : hal-04444851 , version 1

Cite

Zakariae El-alami, Thomas Sayet, Alain Gasser. Development of an orthotropic elastic-visco-plastic behaviour law for the thermomechanical modelling of refractory masonries. UNITECR2023, Sep 2023, Frankfurt, Germany. pp.688-691. ⟨hal-04444851⟩
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