Microfibril Angle Determination of Rattan Fibers and its Influence on the Properties of the Cane

Holzforschung ◽  
2000 ◽  
Vol 54 (4) ◽  
pp. 437-442 ◽  
Author(s):  
Willie P. Abasolo ◽  
Masato Yoshida ◽  
Hiroyuki Yamamoto ◽  
Takashi Okuyama
Keyword(s):  
Young’S Modulus ◽  
Staining Method ◽  
Young's Modulus ◽  
Microfibril Angle ◽  
Curvilinear Relationship ◽  
Longitudinal Shrinkage ◽  
X Ray Diffraction ◽  
X Ray ◽  
Rattan Cane

Summary The microfibril angle of rattan fibers was determined using the iodine staining method and the X-ray diffraction technique. The two were compared to assess the applicability of the X-ray technique in estimating the actual microfibril angle (MFA) of the fiber walls. Likewise, longitudinal Young's modulus and longitudinal shrinkage were evaluated to determine the influence of MFA on the properties of the cane. The X-ray technique gave an accurate and objective estimate of the actual MFA of the fiber walls. A nonlinear relationship existed between MFA and longitudinal Young's modulus while a curvilinear relationship was observed between MFA and longitudinal shrinkage. This pattern is similar to the behavior of wood. Thus, it was deduced that the influence of microfibril angle on the properties of rattan cane is similar to its influence on the properties of wood.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

scholarly journals X-ray Diffraction Analysis and Williamson-Hall Method in USDM Model for Estimating More Accurate Values of Stress-Strain of Unit Cell and Super Cells (2 × 2 × 2) of Hydroxyapatite, Confirmed by Ultrasonic Pulse-Echo Test

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2949
Author(s):  
Marzieh Rabiei ◽  
Arvydas Palevicius ◽  
Amir Dashti ◽  
Sohrab Nasiri ◽  
Ahmad Monshi ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Ultrasonic Pulse ◽  
High Accuracy ◽  
Unit Cell ◽  
Deformation Model ◽  
X Ray Diffraction ◽  
Uniform Deformation ◽  
X Ray ◽  
Pulse Echo

Taking into account X-ray diffraction, one of the well-known methods for calculating the stress-strain of crystals is Williamson-Hall (W–H). The W-H method has three models, namely (1) Uniform deformation model (UDM); (2) Uniform stress deformation model (USDM); and (3) Uniform deformation energy density model (UDEDM). The USDM and UDEDM models are directly related to the modulus of elasticity (E). Young’s modulus is a key parameter in engineering design and materials development. Young’s modulus is considered in USDM and UDEDM models, but in all previous studies, researchers used the average values of Young’s modulus or they calculated Young’s modulus only for a sharp peak of an XRD pattern or they extracted Young’s modulus from the literature. Therefore, these values are not representative of all peaks derived from X-ray diffraction; as a result, these values are not estimated with high accuracy. Nevertheless, in the current study, the W-H method is used considering the all diffracted planes of the unit cell and super cells (2 × 2 × 2) of Hydroxyapatite (HA), and a new method with the high accuracy of the W-H method in the USDM model is presented to calculate stress (σ) and strain (ε). The accounting for the planar density of atoms is the novelty of this work. Furthermore, the ultrasonic pulse-echo test is performed for the validation of the novelty assumptions.

Elastic Properties and Structural Evolution of AgNi Superlattices

1991 ◽  
Vol 229 ◽  
Author(s):  
B. Rodmacq ◽  
V. Pelosin ◽  
J. Hillairet
Keyword(s):  
Young’S Modulus ◽  
Elastic Properties ◽  
Young's Modulus ◽  
Functional Dependence ◽  
Structural Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tension Tests ◽  
Prepared State ◽  
Dimensional Variation

AbstractSilver-nickel multilayers were prepared by sputtering at 100 K. X-ray diffraction, electrical resistivity and dimensional variation measurements were performed to structurally characterize these stratified materials, both in the as-prepared state and during the course of annealing cycles. Clearly, polycrystalline superlattices with marked (111) texture perpendicular to the strata are formed. We studied the elastic properties of these superlattices by performing uniaxial tension tests. No deviation from linear elasticity was observed, whatever the period. Young's modulus was found to be 130±15 GPa for all the periods studied. Thus no significant functional dependence of Young's modulus on the stacking periodicity exists in the AgNi superlattice, in the range of periods explored, 2.6 to 18 nm.

scholarly journals Fabrication and Properties of Aluminum-Containing Silicon Carbide Fibres

2007 ◽  
Vol 16 (2) ◽  
pp. 096369350701600
Author(s):  
Yuxi Yu
Keyword(s):  
Tensile Strength ◽  
Young’S Modulus ◽  
Creep Resistance ◽  
Young's Modulus ◽  
Stoichiometric Composition ◽  
Strength Test ◽  
X Ray Diffraction ◽  
Element Analysis ◽  
X Ray ◽  
Tensile Strength Test

By introducing hetero-element aluminum into ceramic precursor and then sintering, polycrystalline, stoichiometric SiC fibres can be prepared. Two types of aluminum-containing SiC fibres were fabricated by the use of aluminum-containing polycarbosilane (Al-PCS). The air-cured Al-PCS fibres were pyrolyzed in inert gas up to 13 50 °C to obtain SiC(OAl) fibres, which were converted into SiC(Al) fibres by heating in argon up to 1800 °C. The properties and performances of SiC(OAl) and SiC(Al) fibres were studied by chemical element analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD), tensile strength test, heat resistance and creep resistance. These results show SiC(Al) are polycrystalline SiC fibres, have a near stoichiometric composition. The tensile strength, Young's modulus and diameter of the SiC(OAl) fibres are 2.6 GPa, 210 GPa, 12 μm, respectively. The tensile strength, Young's modulus and diameter of the SiC(Al) fibres are 2.1 GPa, 405 GPa, 10 μm, respectively. The SiC(Al) fibres have higher thermal stability, and better creep resistance than the SiC(OAl), the Nicalon and the Hi-Nicalon fibres.

Determination of single-crystal elastic constants from a cubic polycrystalline aggregate

1985 ◽  
Vol 18 (6) ◽  
pp. 513-518 ◽  
Author(s):  
M. Hayakawa ◽  
S. Imai ◽  
M. Oka
Keyword(s):  
Single Crystal ◽  
Young’S Modulus ◽  
Elastic Constants ◽  
Young's Modulus ◽  
Polycrystalline Aggregate ◽  
X Ray ◽  
Cubic Stiffness

A method for determining cubic stiffness constants from polcrystalline Young's modulus and X-ray elastic constants is described. The relations used among these elastic constants are those based on Kröner's quasiisotropic model. The X-ray elastic constants required [S1(hkl)] are obtained by measuring various (hkl) d spacings of a stressed specimen under symmetric θ–2θ scan mode. An application to an Fe–31Ni alloy has given the results: C 11 = 1.47, C 12 = 1.05 and C 44 = 1.24 × 1011 Pa.

Electrospun Gelatin/Hydroxyapatite Nanocomposite Scaffolds for Bone Tissue Engineering

2008 ◽  
Vol 1094 ◽  
Author(s):  
Shane Catledge ◽  
Parul Tyagi ◽  
Mark Koopman ◽  
Andrei Stanishevsky ◽  
Yogesh K. Vohra
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Fibrous Composite ◽  
X Ray Diffraction ◽  
Composite Scaffolds ◽  
X Ray ◽  
Structure And Morphology ◽  
Electrospun Gelatin ◽  
Nanocomposite Scaffolds ◽  
Nanoscale Level

AbstractElectrospun composite scaffolds were prepared by mixing gelatin with nanoparticles of hydroxyapatite (nanoHA) in 2,2,2-trifluoroethanol (TFE) solution. The fibrous composite scaffolds with nanoHA content from 0 to 40 wt% were compared in terms of structure and morphology via x-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that dispersion of nanoHA in the scaffolds is uniform for 0%, 10%, 20%, and 30% nanoHA content, but significant nanoHA agglomeration can be observed for scaffolds with 40% nanoHA. In order to study the effect of nanoHA content on mechanical properties at the nanoscale level, the fibrous scaffolds were pressed into dense pellets and tested by nanoindentation to determine Young's modulus. Young's modulus was found to increase linearly with nanoHA content, reaching unexpectedly high values of 10.2 ± 0.8 GPa. Results are compared with other polymer/HA composites including those made with polycaprolactone or collagen.

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