Theoretical Calculation of Electronic Structure and Mechanical Properties of Quenched Carbon Structural Steel

2013 ◽  
Vol 749 ◽  
pp. 528-534
Author(s):  
Yue Jun Sun ◽  
Si Nan Li ◽  
Hai Fang Shi ◽  
Zhi Yu Gao ◽  
Shao Bin Yang
Keyword(s):  
Mechanical Properties ◽  
Electronic Structure ◽  
Theoretical Calculation ◽  
Structural Steel ◽  
Fatigue Property ◽  
Structure Parameters ◽  
Electron Theory ◽  
Empirical Electron Theory ◽  
Carbon Structural Steel ◽  
The Relationship

To investigate the fatigue property of carbon structural steel in theory, the microstructure and properties of quenched martensite must be studied in detail. In this paper, the electronic structure and mechanical properties of carbon structural steel in quenched state were calculated by the empirical electron theory of solids and molecules (EET). The relationship between electronic structure parameters and mechanical properties of martensite was investigated. The mechanical properties of quenched carbon structural steel were calculated theoretically, and the result of theoretical calculation is consistent with the experiment result.

Relationship between Valence Electron Structures and Mechanical Properties of ZL203

2012 ◽  
Vol 152-154 ◽  
pp. 336-341
Author(s):  
Hua Qu ◽  
Wei Dong Liu
Keyword(s):  
Mechanical Properties ◽  
Valence Electron ◽  
Strengthening Effect ◽  
Strengthening Phase ◽  
Electron Theory ◽  
Valence Electron Structure ◽  
Empirical Electron Theory ◽  
Dislocation Movement ◽  
Aging Stage ◽  
The Relationship

Based on the empirical electron theory of solids and molecules(EET) and valence electron theory of composition design of alloy, the valence electron structure(VES) of phases and phase interfaces of ZL203 are calculated in this paper, and the relationship between the VESs and mechanical properties are also studied. The results are as followed: 1) The of GP is bigger than of a, in other words, the resistance of dislocation movement in GP zone is bigger than that of in a matrix. 2) Compared with a matrix, the phases of q¢¢、q¢、q all have strengthening effects. From the bond combination of atoms composed in the strengthening phase of view, the strengthening effect of q is the best, that of q¢ is second, that of q¢¢ is the worst. 3) The precipitation sequence determined bynAis well accordance with that of depended on thermodynamics free energy. 4) The electron density difference Dr of a/GP, a/q" and a/q¢ interfaces increases one by one, and the stress of these interfaces also increases one by one, therefore the strength falls down one by one. 5) Combined with FSFs and ICFs, we can deduce that the best aging stage of ZL203 is the end of the precipitation of q¢¢ and the beginning of the precipitation of q¢.

Calculation of Statistical Values (S′) of Phase Structure Formation Factor (S) and Application to Solidification Theory of Cast Iron

2011 ◽  
Vol 299-300 ◽  
pp. 114-117
Author(s):  
Zhi Yu Gao ◽  
Wei Hua Xue ◽  
Xin Ren ◽  
Yue Jun Sun ◽  
Shao Bin Yang
Keyword(s):  
Electronic Structure ◽  
Cast Iron ◽  
Structure Formation ◽  
Phase Structure ◽  
Solidification Process ◽  
Alloying Elements ◽  
Structure Parameters ◽  
Formation Factor ◽  
Electron Theory ◽  
Empirical Electron Theory

Statistical values (S′) of phase structure formation factor (S) of alloying elements in cast iron are calculated by the calculation method on statistical value of alloy phases electronic structure parameters based on the empirical electron theory of solids and molecules (EET), and the solidification process of cast iron is discussed by S′. According to the effects of phase structure formation factor (that isS′) on the formation process of graphite, cementite and austenite, electronic structure parameters criterion of graphitization behavior of alloying elements is advanced and the results agree well with the practical cases.

scholarly journals Experimental-numerical studies of the effect of cell structure on the mechanical properties of polypropylene foams

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 713-723
Author(s):  
Wei Gong ◽  
Tuan-Hui Jiang ◽  
Xiang-Bu Zeng ◽  
Li He ◽  
Chun Zhang
Keyword(s):  
Mechanical Properties ◽  
Size Distribution ◽  
Cell Size ◽  
Cell Structure ◽  
Structure Parameters ◽  
Cell Size Distribution ◽  
Numerical Studies ◽  
Polypropylene Foam ◽  
The Impact ◽  
The Relationship

AbstractThe effects of the cell size and distribution on the mechanical properties of polypropylene foam were simulated and analyzed by finite element modeling with ANSYS and supporting experiments. The results show that the reduced cell size and narrow size distribution have beneficial influences on both the tensile and impact strengths. Decreasing the cell size or narrowing the cell size distribution was more effective for increasing the impact strength than the tensile strength in the same case. The relationship between the mechanical properties and cell structure parameters has a good correlation with the theoretical model.

Valence Electron Theoretical Analysis of Mechanical Properties in Low-Alloy Steel

2011 ◽  
Vol 704-705 ◽  
pp. 389-394
Author(s):  
Chuan Sun ◽  
Yun Kai Li ◽  
Lin Jiang
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
Valence Electron ◽  
Electron Structure ◽  
Structure Parameters ◽  
Low Alloy Steel ◽  
Valence Electron Structure ◽  
Empirical Electron Theory ◽  
Valence Electrons ◽  
Set Up

The mechanical properties in low-alloy steel are studied systematically from the view of valence electrons using the Empirical Electron Theory in solid and molecules (EET). Two new valence electron structure parameters ρcvand ρlv, which have closely relation with the mechanical properties of alloy steel are summed up according to the basic idea of EET. The values of the two new valence electron structure parameters in carbon steel and alloy steel which contains Cr, Mn, Ni, Si, W and Mo are calculated. The result demonstrates that ρcvhas a very good corresponding relationship with intensity, and ρlvhas a very good corresponding relationship with plasticity. In this note, a quantitative empirical formula between the valence electrons structure and the intensity and plasticity of alloy steel is initially set up. Keywords: EET, valence electron structure, mechanical property, low-alloy steel

Mechanical Properties of 2D Braided Polyester Ropes

2011 ◽  
Vol 331 ◽  
pp. 52-55
Author(s):  
Jin Qiu Zhang ◽  
Ling Cheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Breaking Strength ◽  
Unit Length ◽  
Structure Parameters ◽  
Two Dimensional ◽  
Breaking Elongation ◽  
Pitch Length ◽  
The Relationship

The relationship between the structure parameters and the mechanical properties of two-dimensional braided polyester ropes were studied. 22 times of polyester ropes were braided with different pitch length and different yarns, and their tensile properties were tested, then the relationship between the mechanical properties of the rope and braiding pitch was obtained. The results showed that the breaking strength of 2D braided ropes increased with the increase of pitch length, but after achieving certain length, the strength began to decline, and the breaking elongation decreased along with the increase of unit length.

scholarly journals Effect of Oxide Particles on Microstructure and Mechanical Properties of the 45 Carbon Structural Steel

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1232
Author(s):  
Bin Chen ◽  
Jianhang Feng ◽  
Yongzhen Zhai ◽  
Zhonghua Sun ◽  
Hongbo Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Structural Steel ◽  
Master Alloy ◽  
Raw Material ◽  
Striking Difference ◽  
Homogeneous Distribution ◽  
Dispersion Strengthening ◽  
Oxide Particles ◽  
Carbon Structural Steel ◽  
The Impact

Striking difference in density between the oxide and the steel results in difficulty in preparing oxide dispersion strengthened steel with large size parts or materials. In this research, Al2O3 and TiO2 particles were initially milled with the 20 steel, and then the mixture was heated to a molten state to form a master alloy, which was used as a raw material for further preparation of the object steel. It was found that homogeneous distribution of the oxide particles was obtained in the mass production of the steel. Moreover, the obtained 45 carbon structural steel presents fine microstructures, together with improved mechanical properties, especially the impact ductility. This should be attributable to the transformation from the introduced micro-size oxide particles to the nano ones, which act as heterogeneous nucleants that play an important role in grain refinement and dispersion strengthening for the steel, during the remelting of the master alloy.

Theoretical Calculation of β Transition Temperature of Ti-6Al-4V from Valence Electron Level

2011 ◽  
Vol 299-300 ◽  
pp. 592-595
Author(s):  
Hua Qu ◽  
Wei Dong Liu
Keyword(s):  
Transition Temperature ◽  
Theoretical Calculation ◽  
Titanium Alloys ◽  
Valence Electron ◽  
Electron Theory ◽  
Electron Level ◽  
Valence Electron Structure ◽  
Electron Pairs ◽  
Stable Element ◽  
Empirical Electron Theory

Based on the empirical electron theory of solids and molecules and the basic theory of the phase transformation of titanium alloys, a new method to calculate β transition temperature of titanium alloys is put forward after calculating the valence electron structure(VES) parameternAwhich is the covalence electron pairs on the strongest bond of alloy phases, the crystal cell weight of a and b phases in the structure, the compensation coefficient of the phase and the temperature coefficient of b stable element. After calculating we find β transition temperature of Ti-6Al-4V is 974.9 °C, the error of the theoretical calculation value and the experimental one(995 °C) is 2%, so it is feasible to calculate β transition temperature of the titanium alloys from covalence electron level.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

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