FEM analysis of static and dynamic mechanical response of branches

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F24%3A43926540" target="_blank" >RIV/62156489:43410/24:43926540 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.swst.org/wp/wp-content/uploads/2024/08/SWST-2024-Final-Proceedings-Editor-copy.pdf" target="_blank" >https://www.swst.org/wp/wp-content/uploads/2024/08/SWST-2024-Final-Proceedings-Editor-copy.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

FEM analysis of static and dynamic mechanical response of branches

Popis výsledku v původním jazyce

Assessment of green wood using vibroacoustic methods faces some limits, especially the estimation of vibration modes can be inaccurate in the case of complex geometries such as branches or logs. An experimentally validated physical model with use of finite element method (FEM) on realistic geometry can help clarify this problem. The samples of linden (Tilia cordata Mill.) and beech (Fagus sylvatica L.) branches without visible defects were studied. The research consists of two phases. Non-destructive and destructive bending tests take place first. The second phase was the development of a validated FEM model. The laser scanning of the branches was used to improve the FEM model by involving of realistic complex geometry. The non-destructive testing involved the application of the frequency-resonant method to get the dynamic response and determine the moduli of elasticity in longitudinal and bending modes. Subsequently, three-point bending tests were carried out until sample crack initiation. The complex three-dimensional FEM model was used for modal analysis and three-point bending simulations. Analysis of the degree of simplification of this precise geometry without affecting the results was also part of the simulation. The relationships of parameters derived from the non-destructive and destructive tests can increase the reliability of quality assessment in-situ methods. The laser-scan-based FEM simulations of the dynamic response of branches bring conclusions for improvement of the frequency-resonant method. The validated simulations of the mechanical response of branches move forward the knowledge of tree biomechanics.

Název v anglickém jazyce

FEM analysis of static and dynamic mechanical response of branches

Popis výsledku anglicky

Assessment of green wood using vibroacoustic methods faces some limits, especially the estimation of vibration modes can be inaccurate in the case of complex geometries such as branches or logs. An experimentally validated physical model with use of finite element method (FEM) on realistic geometry can help clarify this problem. The samples of linden (Tilia cordata Mill.) and beech (Fagus sylvatica L.) branches without visible defects were studied. The research consists of two phases. Non-destructive and destructive bending tests take place first. The second phase was the development of a validated FEM model. The laser scanning of the branches was used to improve the FEM model by involving of realistic complex geometry. The non-destructive testing involved the application of the frequency-resonant method to get the dynamic response and determine the moduli of elasticity in longitudinal and bending modes. Subsequently, three-point bending tests were carried out until sample crack initiation. The complex three-dimensional FEM model was used for modal analysis and three-point bending simulations. Analysis of the degree of simplification of this precise geometry without affecting the results was also part of the simulation. The relationships of parameters derived from the non-destructive and destructive tests can increase the reliability of quality assessment in-situ methods. The laser-scan-based FEM simulations of the dynamic response of branches bring conclusions for improvement of the frequency-resonant method. The validated simulations of the mechanical response of branches move forward the knowledge of tree biomechanics.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20502 - Paper and wood

Projekt

<a href="/cs/project/LL1909" target="_blank" >LL1909: Dynamika stromu: popis mechanické odezvy na zatížení</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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