On the Biaxial Distribution of Anisotropic Elastic Modulus of Thin-Plate Polycrystalline Elements and the Identification by Ultrasonic Methods

2013 ◽  
Vol 55 (7-8) ◽  
pp. 607-609
Author(s):  
Avram Sabetaj Levi
Keyword(s):  
Elastic Modulus ◽  
Thin Plate ◽  
Ultrasonic Methods ◽  
Anisotropic Elastic

RELATIONS OF ANISOTROPIC ELASTIC MODULI TO DENSITY AND CT NUMBER IN BOVINE CORTICAL BONE

2008 ◽  
Vol 20 (03) ◽  
pp. 139-143 ◽  
Author(s):  
Jui-Ting Hsu ◽  
Ming-Tzu Tsai ◽  
Heng-Li Huang
Keyword(s):  
Elastic Modulus ◽  
Bone Density ◽  
Cortical Bone ◽  
Elastic Moduli ◽  
Transversely Isotropic ◽  
Longitudinal Direction ◽  
Coefficient Of Determination ◽  
Ct Number ◽  
Noninvasive Technique ◽  
Anisotropic Elastic

It would be useful to be able to determine the mechanical properties of bone using a noninvasive technique such as computed tomography (CT). However, in contrast to cancellous bone tissue, quantifying the elastic modulus of cortical bone from bone density and CT number has not been investigated extensively. This study measured the elastic moduli of cortical bone from eight bovine femora in the longitudinal, circumferential, and radial directions using mechanical compressive testing. Before testing, the CT number and wet apparent bone density were obtained. The experimentally determined coefficient of determination between CT number and bone density was around 0.6. Bone density was a good predictor of the elastic modulus of cortical bone in the longitudinal direction (r2 > 0.79), but it could not be used to predict the elastic moduli in the circumferential (r2 < 0.4) and radial (r2 < 0.22) directions. The coefficient of determination between CT number and the elastic modulus in the longitudinal direction was higher than 0.41. However, the correlations between CT number and elastic moduli were weak in the circumferential (r2 < 0.21) and radial (r2 < 0.19) directions. Moreover, the elastic modulus was much higher in the longitudinal direction than the circumferential and radial directions, and hence cortical bone can be considered a transversely isotropic property.

Nanocomposite microstructures dominating anisotropic elastic modulus in carbon fibers

2019 ◽  
Vol 166 ◽  
pp. 75-84 ◽  
Author(s):  
Masakazu Tane ◽  
Haruki Okuda ◽  
Fumihiko Tanaka
Keyword(s):  
Elastic Modulus ◽  
Carbon Fibers ◽  
Anisotropic Elastic

Crosslinking of Oriented Rubber

1958 ◽  
Vol 31 (1) ◽  
pp. 98-104 ◽  
Author(s):  
A. Charlesby ◽  
E. von Arnim
Keyword(s):  
Elastic Modulus ◽  
Stress Relaxation ◽  
Elastic Properties ◽  
Electron Irradiation ◽  
Main Chain ◽  
High Energy ◽  
Elongation At Break ◽  
High Energy Electrons ◽  
Anisotropic Elastic ◽  
G Value

Abstract Smoked sheet rubber, previously oriented in the calendering process, was crosslinked by exposure to 2 Mev high energy electrons in the absence of vulcanizing agents. Even after annealing, the resultant rubber showed anisotropic elastic properties, having a high elastic modulus and a low elongation at break in the direction of orientation. It is suggested that radiation in addition to crosslinking causes main chain fracture and stress relaxation in stressed molecular chains. The G value for crosslinking (1.05) by electron irradiation agrees well with that (1.1) previously found by elastic measurements of pile irradiated rubber.

Study of Local Mechanical Properties of Fe78Al22 Alloy

2018 ◽  
Vol 784 ◽  
pp. 27-32 ◽  
Author(s):  
Vilma Buršíková ◽  
Vojtěch Homola ◽  
Yvonna Jirásková ◽  
Naděžda Pizúrová ◽  
Ivana Miháliková ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Grain Orientation ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
Berkovich Indenter ◽  
Indentation Tests ◽  
Anisotropic Elastic ◽  
Crystallographic Orientations ◽  
Good Agreement

The local mechanical properties of Fe78Al22alloy were studied using nanoindentation techniques. Sharp Berkovich indenter was used to perform load-controlled nanoindentation experiments on the studied sample. Hardness and elastic modulus maps were created on the basis of the indentation tests carried out in different grains. The focus of the work was to study the dependence of mechanical properties on the grain orientation. The results were in good agreement with quantum-mechanical calculations of anisotropic elastic properties of the studied alloy. It was explained that the maximum detected elastic modulus values are likely for grains with [111] crystallographic orientations which we theoretically identified as the hard ones.

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