Ab initio investigation of the Young's modulus of polyamide-6

2002 ◽  
Vol 91 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Anik Peeters ◽  
C. Van Alsenoy ◽  
F. Bartha ◽  
F. Bogár ◽  
M.-L. Zhang ◽  
...  
Keyword(s):  
Ab Initio ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Polyamide 6

scholarly journals Закономерности статистического распределения механических свойств волокон полиамида-6

2019 ◽  
Vol 45 (14) ◽  
pp. 20
Author(s):  
Ю.М. Бойко ◽  
В.А. Марихин ◽  
О.А. Москалюк ◽  
Л.П. Мясникова ◽  
Е.С. Цобкалло
Keyword(s):  
Experimental Data ◽  
Distribution Function ◽  
Statistical Analysis ◽  
Weibull Distribution ◽  
Young’S Modulus ◽  
Gaussian Distribution ◽  
Young's Modulus ◽  
Polyamide 6 ◽  
Statistical Distributions ◽  
Weibull Distribution Function

A statistical analysis of the distributions of Young's modulus Е and strain at break b of the commercial oriented fibers of polyamide-6 has been carried out in the frameworks of the models of Gauss and Weibull. The duality of the statistical distributions of Е and b revealed earlier for the strength of polyamide-6 has been confirmed. It consists in the validity of the description of the experimental data by using both the normal Gaussian distribution and the standard Weibull distribution function.

scholarly journals Ab Initio Calculations on Elastic Properties of IF Steel Matrix Phase at High Temperature Based on Lattice Expansion Theory

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 283 ◽  
Author(s):  
Songyuan Ai ◽  
Mujun Long ◽  
Siyuan Zhang ◽  
Dengfu Chen ◽  
Zhihua Dong ◽  
...  
Keyword(s):  
High Temperature ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Young’S Modulus ◽  
Elastic Properties ◽  
Young's Modulus ◽  
Matrix Phase ◽  
Steel Matrix ◽  
Interstitial Free ◽  
If Steel

Elucidating the evolution law of the elastic properties of the matrix phase is of great significance for the control of steel properties and quality during continuous casting and subsequent heat treatment. In this paper, thermal expansion experiments and ab initio calculations are used to study the elastic properties of the interstitial free (IF) steel matrix phase in different magnetic states and crystal structures. The results show that the bulk modulus B and the tetragonal shear elastic constant C’ for the entire temperature range decrease with increasing temperature, but C44 is the opposite. While from paramagnetic (PM) to ferromagnetic (FM) state, C’(C44) have changed ~188% (~27%), B increases by ~55% during the crystal structure change (fcc→bcc). With the FM to PM state, the Zener anisotropy parameter increases sharply, and Young’s modulus decreases significantly in the [001] direction; the maximum difference is ~76 GPa. The evolution rate of average Young’s modulus in single bcc-phase FM (fcc-phase PM) range reaches ~5.5(~5.6) × 10−2 GPa K−1. The research provides an effective method for ab initio calculation of the elastic properties of interstitial free and ultra-low carbon steels at high temperature, also furnishing a basis for the application of ab initio calculations to the high temperature performance of steel materials.

scholarly journals Novel Biobased Polyamide 410/Polyamide 6/CNT Nanocomposites

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 986 ◽  
Author(s):  
Itziar Otaegi ◽  
Nora Aramburu ◽  
Alejandro Müller ◽  
Gonzalo Guerrica-Echevarría
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Polyamide 6 ◽  
Multiwall Carbon Nanotube ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Good Dispersion ◽  
Maximum Conductivity ◽  
Twin Screw ◽  
Potential Applications

Biobased polyamide 410 (PA410)/multiwall carbon nanotube (CNT) nanocomposites (NCs) were obtained by melt-mixing in a twin screw extruder a Polyamide 6 (PA6)-based masterbatch (with 15 wt % CNT content) with neat PA410. Directly mixed PA410/CNT NCs were also obtained for comparison purposes. Transmision Electronic Microscopy (TEM) observation and conductivity measurements demonstrated that a good dispersion of CNTs was obtained, which was probably induced by the full miscibility between PA410 and PA6 (in the concentration range employed here), as ascertained by Differential Scanning Calorimetry (DSC) tests. As a result, the PA410/PA6/CNT NCs showed superior mechanical behaviour (≈10% Young’s modulus increase with a 4 wt % CNT content) than the binary PA410/CNT NCs (≈5% Young’s modulus increase with a 6 wt % CNT content), as well as superior electrical behaviour, with maximum conductivity values of approximately three orders of magnitude higher than in the binary PA410/CNT system, and lower percolation threshold values (0.65 wt % CNT content vs. 3.98 wt % CNT). The good dispersion and enhanced mechanical and electrical properties of these novel biobased nanocomposites, broadens their potential applications, such as electrical and electronics (E&E) or automotive industries.

Pressure Effect on the Structural, Elastic and Electronic Behaviors of Li3Bi: Ab Initio Study

2013 ◽  
Vol 641-642 ◽  
pp. 479-482 ◽  
Author(s):  
Xiao Xiao Sun
Keyword(s):  
Shear Modulus ◽  
Ab Initio ◽  
Electronic Properties ◽  
Young’S Modulus ◽  
First Principles ◽  
Pressure Effect ◽  
Young's Modulus ◽  
Lattice Parameters ◽  
First Principles Calculations ◽  
G Ratio

First principles calculations have been performed to investigate the elastic and electronic behaviors of Li3Bi as a function of pressure from 0 GPa to 100 GPa with a step 10 GPa. Our calculations indicate that the lattice parameters and volume of cubic Li3Bi decrease with the increasing pressure. Cubic Fm-3m structure of Li3Bi is more mechanically stable at pressures of up to 100 GPa. The calculated results of the bulk, shear, Young’s modulus, B/G ratio of Li3Bi as a function of pressure show that Li3Bi has higher bulk, shear modulus and better ductility at 0 GPa than 50 GPa. The analysis of electronic properties reveals that the covalent Bi-Li bonding plays an important role in hardness and incompressibility of Li3Bi.

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.

Degradation of Rocks, Through Cracking Caused by Differential Thermal Expansion, in Relation to Nuclear Waste Repositories

1981 ◽  
Vol 6 ◽  
Author(s):  
J.R. Mclaren ◽  
R.W. Davidge ◽  
I. Titchell ◽  
K. Sincock ◽  
A. Bromley
Keyword(s):  
Thermal Expansion ◽  
Grain Boundary ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Crack Density ◽  
Granitic Rocks ◽  
Multiphase Materials ◽  
Thermal Expansion Behaviour ◽  
Waste Repositories ◽  
Expansion Behaviour

ABSTRACTHeating to temperatures up to 500°C, gives a reduction in Young's modulus and increase in permeability of granitic rocks and it is likely that a major reason is grain boundary cracking. The cracking of grain boundary facets in polycrystalline multiphase materials showing anisotropic thermal expansion behaviour is controlled by several microstructural factors in addition to the intrinsic thermal and elastic properties. Of specific interest are the relative orientations of the two grains meeting at the facet, and the size of the facet; these factors thus introduce two statistical aspects to the problem and these are introduced to give quantitative data on crack density versus temperature. The theory is compared with experimental measurements of Young's modulus and permeability for various rocks as a function of temperature. There is good qualitative agreement, and the additional (mainly microstructural) data required for a quantitative comparison are defined.

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