Effect of temperature and strain rate on the shear properties of Ti–6Al–4V alloy

2006 ◽  
Vol 220 (2) ◽  
pp. 127-136 ◽  
Author(s):  
W-S Lee ◽  
C-F Lin ◽  
S-Z Huang
Keyword(s):  
Shear Band ◽  
Strain Rate ◽  
Adiabatic Shear Band ◽  
Rate Sensitivity ◽  
Adiabatic Shear ◽  
Effect Of Temperature ◽  
Dynamic Shear ◽  
Shear Properties ◽  
Current Test ◽  
Split Hopkinson

This study uses the torsional split-Hopkinson bar to investigate the dynamic shear deformation and fracture behaviour of Ti–6Al–4V alloy under strain rates of 1800, 2300, and 2800 s−1 at temperatures ranging from −100 to 300 °C. It is found that both the strain rate and the temperature have a strong influence on the dynamic shear properties and fracture characteristics of the alloy. An increased strain rate and a reduced temperature cause the strain rate sensitivity to increase and the activation volume to decrease. However, the activation energy increases with decreasing shear stress and is found to attain a maximum value of 15 kJ/ mol under the current test conditions. The failure of the tested alloy is dominated by the formation of an adiabatic shear band. The characteristics of the adiabatic shear band and the fracture surface depend significantly on both the strain rate and the temperature.

scholarly journals Evolution of Adiabatic Shear Band in Ultra-Fine-Grained Iron under Dynamic Shear Loading

2010 ◽  
Vol 667-669 ◽  
pp. 761-765 ◽  
Author(s):  
Fu Ping Yuan ◽  
Xiao Lei Wu
Keyword(s):  
Grain Size ◽  
Shear Band ◽  
Adiabatic Shear Band ◽  
Shear Loading ◽  
Electron Back Scatter Diffraction ◽  
Adiabatic Shear ◽  
Dynamic Shear ◽  
Micro Hardness ◽  
Fine Grained ◽  
Angular Pressing

Ultra-fine-grained (UFG)/Nanocrystalline (NC) materials usually show reduced strain hardening and limited ductility due to formation of adiabatic shear band (ASB) under dynamic loading. In the present study, evolution of ASB in UFG Fe under dynamic shear loading was investigated. The UFG Fe was processed by equal-channel angular pressing (ECAP) via route Bc. After 6 passes, the grain size of UFG Fe reaches ~ 600 nm, as confirmed by means of Electron Back Scatter Diffraction (EBSD). Examination of micro-hardness and grain size of UFG Fe as a function of post-ECAP annealing temperature shows a transition from recovery to recrystallization at 500 0C. The high-strain-rate response of UFG Fe was characterized by hat-shaped specimen set-ups in Hopkinson bar experiments. The characteristics of ASB as a function of shear displacement, such as thickness of shear band and micro-hardness inside the shear band, were examined by SEM and Vickers micro-indentation respectively.

Research on Dynamic Constitutive Relation of Materials Taking Account of Damage Evolution and Fracture Law for High Speed Cutting

2011 ◽  
Vol 188 ◽  
pp. 224-229
Author(s):  
J.Q. Li ◽  
Tao Tao Dong ◽  
Min Jie Wang
Keyword(s):  
Shear Band ◽  
Strain Rate ◽  
Constitutive Relation ◽  
Damage Evolution ◽  
High Speed ◽  
Adiabatic Shear Band ◽  
Adiabatic Shear ◽  
Damage Effect ◽  
Serrated Chip ◽  
Softening Effect

The adiabatic shear, which may produce serrated chip, usually occurs for a large number of materials in high speed machining. Adiabatic shear band is an important damage model for metals under high-velocity deformation process. The damage evolution of micro-voids in adiabatic shear bands resulted in material fracture finally. Now the thermal softening effect, the strain rate harding effect and the strain harding effect have been discussed extensively in literature, but there is very little research on its damage effect. Based on the experiments of predecessors, this paper presents a new damage evolution equation that is dependent on strain, strain rate and is suitable for the description of voids damage evolution in adiabatic shear band. The corresponding rate-dependent constitutive relation taking account of damage evolution and temperature are proposed. The predicted results are in good agreement with the experiment datum.

scholarly journals Adiabatic shear band localization in an Al–Zn–Mg–Cu alloy under high strain rate compression

2020 ◽  
Vol 9 (3) ◽  
pp. 3977-3983 ◽  
Author(s):  
Muhammad Abubaker Khan ◽  
Yangwei Wang ◽  
Ghulam Yasin ◽  
Faisal Nazeer ◽  
Abdul Malik ◽  
...  
Keyword(s):  
Shear Band ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
Adiabatic Shear ◽  
Cu Alloy ◽  
Strain Rate Compression ◽  
Shear Band Localization

Understanding of adiabatic shear band evolution during high-strain-rate deformation in high-strength armor steel

2020 ◽  
Vol 845 ◽  
pp. 155540 ◽  
Author(s):  
Min Cheol Jo ◽  
Selim Kim ◽  
Dae Woong Kim ◽  
Hyung Keun Park ◽  
Sung Suk Hong ◽  
...  
Keyword(s):  
Shear Band ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
High Strength ◽  
Adiabatic Shear ◽  
High Strain Rate Deformation ◽  
Armor Steel

Mechanisms of Grains Refining in Adiabatic Shear Band of Titanium Alloy

2012 ◽  
Vol 562-564 ◽  
pp. 312-317
Author(s):  
Kun Sun ◽  
Yuan Xu ◽  
Jin Hao Liu
Keyword(s):  
Titanium Alloy ◽  
Electron Microscope ◽  
Shear Band ◽  
Dynamic Recrystallization ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Adiabatic Shear Band ◽  
Optical Microscope ◽  
Adiabatic Shear

Dynamic shearing high strain-rate experiments on three types of titanium alloy have been carried out by using a modified split Hopkinson bar. Microstructure and mechanism for grains refining in adiabatic shear band formed under the condition of high strain-rate were investigated by means of optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). It is shown that the mechanisms for grains refining in adiabatic shear band of titanium alloy mostly consist of three sorts. They are the mechanism of breakdown of elongated grains which due to action of dislocations,and the mechanism of rupture of twins and the mechanism of dynamic recrystallization, respectively. The mechanism of dynamic recrystallization is the universal one for grains refining in adiabatic shear band of titanium alloy. The formation of refining grains is usually a result of combined action of several sorts of mechanisms.

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