The generalized Kelvin chain-based model for an orthotropic viscoelastic material

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F24%3APU152302" target="_blank" >RIV/00216305:26110/24:PU152302 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/62156489:43410/24:43924875

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s11043-024-09678-4" target="_blank" >https://link.springer.com/article/10.1007/s11043-024-09678-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11043-024-09678-4" target="_blank" >10.1007/s11043-024-09678-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The generalized Kelvin chain-based model for an orthotropic viscoelastic material

Popis výsledku v původním jazyce

We propose a constitutive material model to describe the rheological (viscoelastic) mechanical response of timber. The viscoelastic model is based on the generalized Kelvin chain applied to the orthotropic material and is compared to the simple approach given by standards. The contribution of this study consists of the algorithmization of the viscoelastic material model of the material applied to the orthotropic constitutive law and implementation into the FEM solver. In the next step, the fitting of the input parameters of the Kelvin chain is described, and at least a material model benchmark and comparison to the approach given by standards were done. The standardized approach is based on the reduction of the material rigidity at the end of the loading period using a creep coefficient, whereas the loading history state variables are not considered when establishing the result for a specific time step. The paper presents the benefits of the rheological model. It also demonstrates the fitting algorithm based on particle swarm optimization and the least squares method, which are essential for the use of the generalized Kelvin chain model. The material model based on the orthotropic generalized Kelvin chain was implemented into the FEM solver for the shell elements. This material model was validated on the presented benchmark tasks, and the influence of the time step size on the accuracy of model results was analyzed.

Název v anglickém jazyce

The generalized Kelvin chain-based model for an orthotropic viscoelastic material

Popis výsledku anglicky

We propose a constitutive material model to describe the rheological (viscoelastic) mechanical response of timber. The viscoelastic model is based on the generalized Kelvin chain applied to the orthotropic material and is compared to the simple approach given by standards. The contribution of this study consists of the algorithmization of the viscoelastic material model of the material applied to the orthotropic constitutive law and implementation into the FEM solver. In the next step, the fitting of the input parameters of the Kelvin chain is described, and at least a material model benchmark and comparison to the approach given by standards were done. The standardized approach is based on the reduction of the material rigidity at the end of the loading period using a creep coefficient, whereas the loading history state variables are not considered when establishing the result for a specific time step. The paper presents the benefits of the rheological model. It also demonstrates the fitting algorithm based on particle swarm optimization and the least squares method, which are essential for the use of the generalized Kelvin chain model. The material model based on the orthotropic generalized Kelvin chain was implemented into the FEM solver for the shell elements. This material model was validated on the presented benchmark tasks, and the influence of the time step size on the accuracy of model results was analyzed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

MECHANICS OF TIME-DEPENDENT MATERIALS

ISSN

1385-2000

e-ISSN

1573-2738

Svazek periodika

28

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

21

Strana od-do

1639-1659

Kód UT WoS článku

001173370800001

EID výsledku v databázi Scopus

2-s2.0-85186539675