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Wyszukujesz frazę "elastic modul" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
The effect of trabecular bone storage method on its elastic properties
Autorzy:
Mazurkiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/307220.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
analiza statystyczna
moduł sprężystości
kość beleczkowa
zamrażanie-odmrażanie cykliczne
statistical analysis
elastic modulus
trabecular bone
freeze-thaw cycle
storage method
Opis:
Purpose: The purpose of the study was to evaluate the effects of different methods of trabecular bone storage on changes in its elastic properties. Methods: 186 porcine trabecular bone samples were divided into 6 groups, approximately 30 samples each. Five groups were stored using the following methods: in buffered 10% formalin solution at room temperature, frozen at –21 C, in the open air at room temperature, in 96% alcohol solution and in 50% alcohol solution at room temperature. The samples were subjected to compression test to measure the elastic modulus. The samples after the first measurement were subjected to further measurements for 14 weeks, every 2 weeks. The sixth group was used to determine the effects of 10 freeze-thaw cycles on changes in the elastic modulus. A Kolmogorov–Smirnov test at significance level p = 0.05 was used to determine the significance of changes in time. Results: The changes in elastic properties caused by the different storage methods were statistically insignificant, except for the group of samples stored in the open air. The changes in elastic modulus after 10 freeze-thaw cycles were also statistically insignificant. Conclusions: Except for the storage method in the open air, other storage methods did not significantly affect changes in elastic properties of the trabecular bones after 14 weeks. No effects of 10 freeze-thaw cycles on changes in elastic modulus were observed.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 1; 21-27
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On prediction of the compressive strength and failure patterns of human vertebrae using a quasi-brittle continuum damage finite element model
Autorzy:
Nakhli, Zahira
Hatira, Fafa Ben
Pithioux, Martine
Chabrand, Patrick
Saanouni, Khemais
Powiązania:
https://bibliotekanauki.pl/articles/307420.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
element końcowy
moduł sprężystości
złamanie kręgów
model uszkodzenia
finite element
elastic modulus
vertebrae fracture
quasi-brittle damage model
mesh sensitivity
Opis:
Damage of bone structures is mainly conditioned by bone quality related to the bone strength. The purpose of this work was to present a simple and reliable numerical treatment of a quasi-brittle damage constitutive model coupled with two different elastic modulus and to compare the numerical results with the experimental ones. Methods: To achieve this goal, a QCT based finite element model was developed within the framework of CDM (Continuum Damage Mechanics) and implemented in the FE code (ABAQUS). It described the propagation of brittle cracks which will help to predict the ultimate load fracture of a human vertebra by reproducing the experimental failure under quasi-static compressive loading paths of nineteen cadaveric lumbar vertebral bodies. Results: The numerical computations delivered by the proposed method showed a better agreement with the available experimental results when bone volume fraction related Young’s modulus (E(BV/TV)) is used instead of density related Young’s modulus (E(ρ)). Also, the study showed that the maximum relative error (%) in failure was 8.47% when E(BV/TV) was used, whereas the highest relative error (%) was 68.56% when E(ρ) was adopted. Finally, a mesh sensitivity analysis revealed that the element size has a weak incidence on the computed load magnitude. Conclusions: The numerical results provided by the proposed quasi-brittle damage model combined with E(BV/TV) are a reliable tool for the vertebrae fracture prediction.
Źródło:
Acta of Bioengineering and Biomechanics; 2019, 21, 2; 143-151
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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