scholarly journals Research on adiabatic shear failure character of pure copper and aluminum bronze based on empirical electron theory

AIP Advances ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 015001 ◽  
Author(s):  
Jin-quan Li ◽  
Bi-cong Xu ◽  
Yan-hui Zhang ◽  
Shu-tao Huang ◽  
Xia- Zhao
Keyword(s):  
Shear Failure ◽  
Pure Copper ◽  
Adiabatic Shear ◽  
Aluminum Bronze ◽  
Electron Theory ◽  
Empirical Electron Theory ◽  
Failure Character

Some experiments on adiabatic shear failure

2006 ◽  
Vol 134 ◽  
pp. 835-838 ◽  
Author(s):  
D. Rittel ◽  
Z. G. Wang ◽  
M. Merzer
Keyword(s):  
Shear Failure ◽  
Adiabatic Shear

Theoretical Calculation of the Polytypism Transition Temperature of Titanium Alloys on the Valence Electron Level

2012 ◽  
Vol 152-154 ◽  
pp. 342-347
Author(s):  
Hua Qu ◽  
Wei Dong Liu
Keyword(s):  
Transition Temperature ◽  
Titanium Alloys ◽  
Valence Electron ◽  
Pure Titanium ◽  
Electron Theory ◽  
Electron Level ◽  
Valence Electron Structure ◽  
Electron Pairs ◽  
Stable Element ◽  
Empirical Electron Theory

Based on the polytypism transition temperature(PPT) of pure titanium, the the empirical electron theory of solids and molecules(EET) and the basic theory of the phase transformation of titanium alloys, a new method to calculate the PTT of titanium alloys is put forward after calculating the valence electron structure(VES) parameter nA which is the covalence electron pairs on the strongest bond of alloy phases, the crystal cell weight of  and  phases in the structure, the compensation coefficient of the phase and the temperature coefficient of  stable element. After calculating the PTT of some common titanium alloys, we find that the theoretical values are consistent with the experimental ones, so it is feasible to calculate the polytypism transition temperature of the titanium alloys on the covalence electron level.

Adiabatic shear failure under biaxial dynamic compression/ shear loading

1994 ◽  
Vol 17 (2-3) ◽  
pp. 203-214 ◽  
Author(s):  
L.W. Meyer ◽  
E. Staskewitsch ◽  
A. Burblies
Keyword(s):  
Shear Failure ◽  
Dynamic Compression ◽  
Shear Loading ◽  
Adiabatic Shear

Modeling adiabatic shear failure from energy considerations

2010 ◽  
Vol 58 (11) ◽  
pp. 1759-1775 ◽  
Author(s):  
M. Dolinski ◽  
D. Rittel ◽  
A. Dorogoy
Keyword(s):  
Shear Failure ◽  
Adiabatic Shear

The influence of temper condition on adiabatic shear failure of AA 2024 aluminum alloy

2017 ◽  
Vol 708 ◽  
pp. 492-502 ◽  
Author(s):  
A.A. Tiamiyu ◽  
A.Y. Badmos ◽  
A.G. Odeshi ◽  
J.A. Szpunar
Keyword(s):  
Aluminum Alloy ◽  
Shear Failure ◽  
Adiabatic Shear ◽  
2024 Aluminum Alloy ◽  
Aa 2024

Inspection of Adiabatic Shear Bands in High Manganese TRIP Steels

2013 ◽  
Vol 753 ◽  
pp. 72-75 ◽  
Author(s):  
Hui Zhen Wang ◽  
Xiu Rong Sun ◽  
Ping Yang ◽  
Wei Min Mao
Keyword(s):  
Shear Failure ◽  
High Strain ◽  
Shear Bands ◽  
Adiabatic Shear ◽  
Strain Rates ◽  
Trip Effect ◽  
Adiabatic Shear Bands ◽  
High Manganese ◽  
High Strain Rates ◽  
Trip Steels

Adiabatic shear bands (ASBs) develop generally during high strain rates. This paper investigates the transformation induced plasticity (TRIP) effect during ASBs formation at high strain rates in high manganese TRIP steels containing initial austenite and ferrite by EBSD technique. Results show that TRIP effect takes place mainly before the formation of ASBs. After ASBs formation, TRIP effect is strongly restricted by the size effect, the increase of stacking fault energy (SFE) and even inverse martensitic transformation due to the rise of temperature. The TRIP effect before ASBs formation contributes to the resistance of adiabatic shear failure. Dynamic recrystallization driven by subgrains rotation occurs within ASBs, and ultrafine grains often show strong shear textures with twin relationship owing to slip mechanism.

Relationships between the Abilities of the Forming Bond of the Precipitated Phases and their Precipitations and Phases Transition in Al-Fe-Si Alloy

2010 ◽  
Vol 152-153 ◽  
pp. 1049-1053
Author(s):  
Hua Qu ◽  
Wei Dong Liu ◽  
Chuang Liu ◽  
Gang Zhou ◽  
Xiao Lu Shen
Keyword(s):  
High Temperature ◽  
Solid Solutions ◽  
Electron Theory ◽  
Empirical Electron Theory ◽  
The Matrix ◽  
Cooling Speed ◽  
The Stability ◽  
Precipitated Phases

According to the empirical electron theory of solid and molecule, the valence election structures of the matrix  of Al-Fe-Si alloy, solid solutions of -Al-Fe and -Al-Fe-Si, precipitated phases of A13(Fe,Si), Al8Fe2Si and Al12Fe3Si and their abilities of the forming bond were calculated, then the relationships between the abilities of the forming bond of the main precipitated phases in Al-Fe-Si alloys and their precipitations and phases transition were studied in this paper. From the results we find that the ability of the forming bond of Al12Fe3Si (637.23) is small, that of Al3(Fe,Si) (670.52) is large and that of Al8Fe2Si (1038.27) is the largest; the larger the cooling speed, the more amount of the precipitated first of Al12Fe3Si, the few amount of the precipitated of Al3(Fe,Si) and Al8Fe2Si; the stability of Al12Fe3Si is smaller than that of Al3(Fe,Si) and Al8Fe2Si, and under high temperature, the phase of Al12Fe3Si can grow up and coarsen and even change into Al3(Fe,Si) and Al8Fe2Si.

Analysis of Structural Condition and Thermodynamics Condition of Graphite Heterogeneity Nucleation in Cast Iron

2011 ◽  
Vol 299-300 ◽  
pp. 576-579
Author(s):  
Hua Qu ◽  
Wei Dong Liu
Keyword(s):  
Crystal Structure ◽  
Cast Iron ◽  
Valence Electron ◽  
Large Angle ◽  
Structural Condition ◽  
Nucleation Theory ◽  
Electron Theory ◽  
Modern Times ◽  
Bond Forming ◽  
Empirical Electron Theory

Based on the empirical electron theory of solid and molecule, the valence electron structures(VESs) of graphite, CaS and MnS in cast iron are calculated, their bond-forming energy F of the structure unit and bond-forming energyEof the crystal plane are defined and calculated. Combined with the nucleation theory of the liquid metal,Fand E are applied to analyze the thermodynamics condition of graphite heterogeneity nucleation in undercooling liquid of case iron, i.e.,GL-FG>GL-FH,>. According to the coincidence lattice model of large-angle grain boundary used commonly in modern times, the corresponding structural condition is analyzed, i.e., the crystal structure of graphite should have the better lattice contract ratio with the crystal structure of its annexed heterogeneous particles.

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