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Tensile and flexural moduli for human orbital wall bones - comparative study

Lemski Pawel, Żerdzicki Krzysztof Ryszard, Klosowski Pawel, Skorek Andrzej, Zmuda-Trzebiatowski Marcin Andrzej

Acta of Bioengineering and Biomechanics

2023

Vol. 25, no. 3

The main aims of the current research were: (1) to analyze in detail the tensile modulus and ultimate tensile strength (UTS) of orbital wall bones separately for the left and right orbit of the same cadaver and (2) to compare the obtained results with a flexural modulus of the left and right orbit reported earlier by A. C. van Leeuwen et al. [14]. A set of 54 specimens of orbital superior and/or medial walls harvested from 16 human skulls (4 female, 12 male) were tensioned at 0.01 mm/s till fracture. The samples were taken always from both orbits of the same cadaver. For each sample, cross-section area, apparent density, tensile modulus, and UTS were identified. For pooled female and male group apparent density for right and left orbit was identified to be 1.59 (± 0,52 SD) g/cm3 and 1.51 (± 0.48 SD) g/cm3 , tensile modulus 2028 (± 1729 SD) MPa and 2706 (± 2812 SD) MPa, and UTS 14.17 (± 15.00 SD) MPa and 15.03 (± 11.44 SD) MPa, respectively. For tensile tests, there were no statistical differences between the left and right orbit for pooled male and female groups for (a) apparent density (T-Student test p=0.567), (b) UTS (Mann-Whitney U-test p=0.350) and (c) tensile modulus (Mann-Whitney U-test p=0.716). For bending tests, there were no statistical differences between the left and right orbit for the pooled male and female group for (a) orbital wall thickness (T-Student test p=0.811) and (b) flexural modulus (Mann-Whitney Utest p=0.206). The comparative analysis between tensile and flexural moduli for pooled left and right groups (with no distinction for male and female) revealed no statistically significant difference (Mann-Whitney U-test p=0.074). The maximum tensile modulus was 7279 MPa and 9913 MPa for the right and left orbit, respectively, and was similar to the maximum flexural modulus of 6870 MPa and 9170 MPa reported in an earlier study, for the right and left orbit, respectively.

Effect of thermal treatment on mechanical properties of sustainable composite: experimental and simulation study

Ouchte I, Ait El Fqih M, Chafiq J, Matadi Boumbimba R, Mikdam A, Chakir H

Composites Theory and Practice

2021

R. 21, nr 3

102--106

The aim of this work is to accurately characterize the thermomechanical behavior of jute-polyester composites. The thermal characteristics and the mechanical properties are determined over a temperature range from ambient to 100°C. The effect of temperature on the tensile breakage of specimens was investigated in order to determine the ability of this composite to maintain its mechanical resistance. It was observed that Young’s modulus and the tensile strength undergo an increase of about 80% when the temperature rises from ambient temperature to 60°C and a decrease for a temperature range from 60°C to 100°C. Numerical simulations, based on FEM analysis, provided results in good agreement with the experimental data in terms of the stress-strain curves. These simulations were achieved using Abaqus explicit finite element code. The increase and decrease in the mechanical properties were attributed to modification of the adhesion forces at the fiber/matrix interface.