Materials Science and Engineering: C

2014

DOI: 10.1016/j.msec.2014.05.053

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Response to the Letter to the Editor: Measurement of the uniaxial mechanical properties of healthy and atherosclerotic human coronary arteries

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Mahdi Navidbakhsh

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Cited by 6 publications

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“…All materials in this study considered to be homogenous and isotropic. [28][29][30][31][32][33] Nonetheless, dental material may present hyperelastic [34][35][36][37][38] or viscoelastic [39][40][41][42][43][44] mechanical behavior rather than simple elastic one. [45][46][47] Therefore, there is a need to conduct an experimental study using uniaxial or biaxial tensile test machine [48][49][50][51][52] to measure their anisotropic visco-hyperelastic behavior.…”

Section: Discussionmentioning

confidence: 99%

A Three-Dimensional Finite Element Study to Characterize the Influence of Load Direction on Stress Distribution in Bone Around Dental Implant

et al. 2014

j biomater tissue eng

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This study aimed to establish a three-dimensional (3D) finite element model for variation of loading direction to identify its effects on the stress distribution generated around an implant and surrounding jawbone under biomechanical consideration. Twenty one 3D finite element cases containing the endosseous titanium implant in type II bone under three different loads i.e., 50, 100, and 200 N, with various directions from 0 to 30 degrees to the vertical axis with the increasing rate of 5 degrees were applied to analyze the stress distribution pattern in the implant and surrounding bone. For data analysis, the von Mises criterion was used. The results revealed that the oblique loading would significantly induce higher interfacial stresses compared to the vertical loading. The highest on Mises stress was observed in the implant for all the cases. An increasement of the angle of force both increased the maximum stress and worsened stress distribution patterns in the implant and supporting bone. The results suggest that under oblique load 30 the maximum von Mises stresses in the implant, cortical, and cancellous bones increase by 236%, 322%, and 22%, respectively. The findings of this study may have implications not only for understanding the stress distribution in implant and bone under various loading angles but also for determining an optimum implant for specific application in dentistry.

“…All materials in this study considered to be homogenous and isotropic. [28][29][30][31][32][33] Nonetheless, dental material may present hyperelastic [34][35][36][37][38] or viscoelastic [39][40][41][42][43][44] mechanical behavior rather than simple elastic one. [45][46][47] Therefore, there is a need to conduct an experimental study using uniaxial or biaxial tensile test machine [48][49][50][51][52] to measure their anisotropic visco-hyperelastic behavior.…”

Section: Discussionmentioning

confidence: 99%

A Three-Dimensional Finite Element Study to Characterize the Influence of Load Direction on Stress Distribution in Bone Around Dental Implant

et al. 2014

j biomater tissue eng

Self Cite

View full text Add to dashboard Cite

This study aimed to establish a three-dimensional (3D) finite element model for variation of loading direction to identify its effects on the stress distribution generated around an implant and surrounding jawbone under biomechanical consideration. Twenty one 3D finite element cases containing the endosseous titanium implant in type II bone under three different loads i.e., 50, 100, and 200 N, with various directions from 0 to 30 degrees to the vertical axis with the increasing rate of 5 degrees were applied to analyze the stress distribution pattern in the implant and surrounding bone. For data analysis, the von Mises criterion was used. The results revealed that the oblique loading would significantly induce higher interfacial stresses compared to the vertical loading. The highest on Mises stress was observed in the implant for all the cases. An increasement of the angle of force both increased the maximum stress and worsened stress distribution patterns in the implant and supporting bone. The results suggest that under oblique load 30 the maximum von Mises stresses in the implant, cortical, and cancellous bones increase by 236%, 322%, and 22%, respectively. The findings of this study may have implications not only for understanding the stress distribution in implant and bone under various loading angles but also for determining an optimum implant for specific application in dentistry.

“…The linear and quasilinear models, mostly relevant in the small strain regime, are unable to fully capture the complexities of the tissue response at finite strains. In contrast, some of the large strain kinematics models, integrating nonlinearities within their formulation, are able to successfully reproduce some specific features of the tissue deformation over fairly complex loading histories [19,20,44]. The abdomen and back skins of a rat body were excised for the tensile test measurements.…”

Section: Resultsmentioning

confidence: 99%

Measurement of the axial and circumferential mechanical properties of rat skin tissue at different anatomical locations

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et al. 2015

Biomedical Engineering / Biomedizinische Technik

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Skin tissue is not only responsible for thermoregulation but also for protecting the human body from mechanical, bacterial, and viral insults. The mechanical properties of skin tissue may vary according to the anatomical locations in the body. However, the linear elastic and nonlinear hyperelastic mechanical properties of the skin in different anatomical regions and at different loading directions (axial and circumferential) so far have not been determined. In this study, the mechanical properties during tension of the rat abdomen and back were calculated at different loading directions using linear elastic and nonlinear hyperelastic material models. The skin samples were subjected to a series of tensile tests. The elastic modulus and maximum stress of the skin tissues were measured before the incidence of failure. The nonlinear mechanical behavior of the skin tissues was also computationally investigated through a constitutive equation. Hyperelastic strain energy density function was calibrated using the experimental data. The results revealed the anisotropic mechanical behavior of the abdomen and the isotropic mechanical response of the back skin. The highest elastic modulus was observed in the abdomen skin under the axial direction (10 MPa), while the lowest one was seen in the back skin under axial loading (5 MPa). The Mooney-Rivlin material model closely addressed the nonlinear mechanical behavior of the skin at different loading directions, which can be implemented in the future biomechanical models of skin tissue. The results might have implications not only for understanding of the isotropic and anisotropic mechanical behavior of skin tissue at different anatomical locations but also for providing more information for a diversity of disciplines, including dermatology, cosmetics industry, clinical decision making, and clinical intervention.

Determination of the axial and circumferential mechanical properties of the skin tissue using experimental testing and constitutive modeling

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et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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The skin, being a multi-layered material, is responsible for protecting the human body from the mechanical, bacterial, and viral insults. The skin tissue may display different mechanical properties according to the anatomical locations of a body. However, these mechanical properties in different anatomical regions and at different loading directions (axial and circumferential) of the mice body to date have not been determined. In this study, the axial and circumferential loads were imposed on the mice skin samples. The elastic modulus and maximum stress of the skin tissues were measured before the failure occurred. The nonlinear mechanical behavior of the skin tissues was also computationally investigated through a suitable constitutive equation. Hyperelastic material model was calibrated using the experimental data. Regardless of the anatomic locations of the mice body, the results revealed significantly different mechanical properties in the axial and circumferential directions and, consequently, the mice skin tissue behaves like a pure anisotropic material. The highest elastic modulus was observed in the back skin under the circumferential direction (6.67 MPa), while the lowest one was seen in the abdomen skin under circumferential loading (0.80 MPa). The Ogden material model was narrowly captured the nonlinear mechanical response of the skin at different loading directions. The results help to understand the isotropic/anisotropic mechanical behavior of the skin tissue at different anatomical locations. They also have implications for a diversity of disciplines, i.e., dermatology, cosmetics industry, clinical decision making, and clinical intervention.

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