scholarly journals Effects of temperature and strain rate on the tensile behavior of unfilled and talc-filled polypropylene. Part II: Constitutive equation

2002 ◽  
Vol 42 (12) ◽  
pp. 2461-2470 ◽  
Author(s):  
Yuanxin Zhou ◽  
P. K. Mallick
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Tensile Behavior ◽  
Effects Of Temperature

Constitutive Equation for V–5Cr–5Ti at High Temperatures Measured Using the SHPB Technique

2011 ◽  
Vol 314-316 ◽  
pp. 1154-1158
Author(s):  
Wen Jun Hu ◽  
Ruo Ze Xie ◽  
Xi Cheng Huang ◽  
Yi Xia Yan
Keyword(s):  
High Temperature ◽  
Constitutive Equation ◽  
Strain Rate ◽  
High Temperatures ◽  
Split Hopkinson Pressure Bar ◽  
Test System ◽  
Vanadium Alloy ◽  
Strain And Strain Rate ◽  
Shpb Test ◽  
Effects Of Temperature

A high temperature split Hopkinson pressure bar (SHPB) test system is used to investigate the effects of temperature as well as those of strain and strain-rate. Effects of temperature for the vanadium alloy (V-5Cr-5Ti) are investigated by developing a high temperature SHPB test system. In this work, high temperatures greater than 1100°C are attained in the SHPB test specimens by using a synchronically assembled heating system .When testing with the high-temperature SHPB apparatus, care is required to prevent oxidation of the surface of the specimen, and to prevent an inhomogeneous temperature distribution from developing in the specimen. To determine the true flow stress–true strain relationship, specimens are tested from 15°C to 1100°C and at a strain-rate of about 3000 s-1: The parameters for a Johnson–Cook constitutive equation is determined from the test results. The Johnson–Cook constitutive equation is suitable for expressing the dynamic behavior of the V-5Cr-5Ti vanadium alloy.

scholarly journals Tensile Behavior of Polyetheretherketone over a Wide Range of Strain Rates

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Zakaria El-Qoubaa ◽  
Ramzi Othman
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Volume Change ◽  
Axial Strain ◽  
Rate Sensitivity ◽  
Tensile Behavior ◽  
Image Correlation ◽  
Strain Rates ◽  
Wide Range ◽  
The Impact

Polyetheretherketone (PEEK) is used in several engineering applications where it has to bear impact loads. Nevertheless, the tensile behavior has only been studied in the quasi-static range of loading rates. To address the lack of data in the impact strain rate range, the tensile mechanical behavior of PEEK is investigated at room temperature over a large range of strain rates (from 0.001 to 1000/s). The macroscopic volume change is studied under uniaxial tension using digital image correlation (DIC) method, showing a significant dilatation that reaches 16% at a logarithmic axial strain of 40%. The true stress-strain behavior is therefore established based on the measured volume change. Elsewhere, the yield stress shows a significant sensitivity to strain rate. Besides, a new constitutive equation is proposed to take into account the increase in strain rate sensitivity at high strain rates. It assumes an apparent activation volume which decreases as the strain rate increases. The new constitutive equation gives similar results when compared to the Ree-Eyring equation. However, only three material constants are to be identified and are physically interpreted.

scholarly journals EFFECTS OF TEMPERATURE AND STRAIN RATE ON THE TENSILE BEHAVIOR OF POLYETHYLENE FILMS

1976 ◽  
Vol 32 (11) ◽  
pp. T458-T470
Author(s):  
Takuji Yamaguchi ◽  
Hiroaki Ogino ◽  
Teruaki Yanagawa ◽  
Satoo Kimura
Keyword(s):  
Strain Rate ◽  
Tensile Behavior ◽  
Polyethylene Films ◽  
Effects Of Temperature

Effects of laser beam defocusing on high-strain-rate tensile behavior of press-hardened Zn-coated 22MnB5 steel welds

2021 ◽  
Vol 141 ◽  
pp. 107116
Author(s):  
M.H. Razmpoosh ◽  
M.S. Khan ◽  
A. Ghatei Kalashami ◽  
A. Macwan ◽  
E. Biro ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Tensile Behavior ◽  
22Mnb5 Steel ◽  
Steel Welds

The influence of strain rate on the cavitation time and deformation of an underwater impulsively rectangular plate

2021 ◽  
pp. 030932472110208
Author(s):  
Habib Ramezannejad Azarboni ◽  
Abolfazl Darvizeh
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Rectangular Plate ◽  
Total Pressure ◽  
Elastoplastic Deformation ◽  
Underwater Explosion ◽  
Strain Rate Effect ◽  
Linear Solution ◽  
Explosion Load ◽  
Explosive Forming

The effect of strain rate on the cavitation time and elastoplastic deformation of steel rectangular plate subjected to underwater explosion load is analytically and numerically investigated in this study. At the cavitation time, the total pressure of the explosion is eliminated so that the cavitation time plays a significant role in the elastoplastic deformation of underwater explosive forming of plate. Taking into account the strain rate effect, the Cowper-Symond constitutive equation of mild steel is employed. Exact linear solution using the Eigen function and numerical linear and nonlinear solution using finite difference method (FDM) of dynamic response of impulsively plate is obtained. Implementing the linear work hardening, the stress, strain, displacement, and velocity in any steps of loading are calculated. The time of cavitation can be recognized in elastic or plastic regimes by applying the Cowper-Symond constitutive equation. Considering the strain rate influence, the effects of charge mass and standoff are investigated to occur of cavitation and time dependent deflection and velocity of a rectangular plate.

Hot Compression Deformation Behavior of Spray-Formed AlSn20Cu Alloy

2021 ◽  
Vol 1035 ◽  
pp. 189-197
Author(s):  
Bao Ying Li ◽  
Bao Hong Zhu
Keyword(s):  
Constitutive Equation ◽  
Strain Rate ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Phase Distribution ◽  
True Stress ◽  
Hot Compression ◽  
Test Machine ◽  
Hot Compression Deformation ◽  
Compression Deformation

The hot deformation behavior of spray-formed AlSn20Cu alloy during hot compression deformation was studied, and the constitutive equation of AlSn20Cu alloy was established. The samples of spray-formed AlSn20Cu alloy were compressed on Gleeble-3500 thermal simulation test machine. The error of the true stress caused by adiabatic heating effect in the experiment was corrected. The constitutive equation of spray-formed AlSn20Cu alloy could be represented by Zener-Hollomon parameter in a hyperbolic sine function. The results showed that the deformation temperatures and strain rates had a notable effect on the true stress of the alloy. At the identical deformation temperature, the true stress increased with the increase of strain rate. When the strain rate was constant, the stress decreased with the increase of deformation temperature. After hot compression deformation, the tin phase was elongated along the direction perpendicular to the compression axis with short strips and blocks. With the increase of deformation temperature and the decrease of strain rate, Sn phase distribution became more homogeneous.

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