A new approach to the determination of plastic flow stress and failure initiation strain for aluminum alloys cutting process

2014 ◽  
Vol 95 ◽  
pp. 568-578 ◽  
Author(s):  
Guang Chen ◽  
Jun Li ◽  
Yinglun He ◽  
Chengzu Ren
Keyword(s):  
Flow Stress ◽  
Aluminum Alloys ◽  
Plastic Flow ◽  
Cutting Process ◽  
New Approach ◽  
Failure Initiation ◽  
Plastic Flow Stress

Strain-rate dependence of hardening and softening in compression of a bulk-metallic glass

2007 ◽  
Vol 22 (10) ◽  
pp. 2655-2658 ◽  
Author(s):  
W.H. Jiang ◽  
F.X. Liu ◽  
F. Jiang ◽  
K.Q. Qiu ◽  
H. Choo ◽  
...  
Keyword(s):  
Flow Stress ◽  
Metallic Glass ◽  
Strain Rate ◽  
Bulk Metallic Glass ◽  
Plastic Flow ◽  
Shear Banding ◽  
Constant Strain Rate ◽  
Rate Dependence ◽  
Strain Rate Dependence ◽  
Plastic Flow Stress

We investigated the effect of strain rate on the plastic-flow stress of a Zr-based bulk-metallic glass in quasistatic compression. The results indicate that the plastic-flow stress is dependent on the strain rate: an increase in the strain rate leads to a decrease in the plastic-flow stress, and vice versa. However, simply loading, unloading, and reloading at a constant strain rate do not change the plastic-flow stress. This strain-rate dependence of the plastic-flow stress may be related to shear-banding operations.

Plastic Flow Stress and Constitutive Model for H96 Brass Alloy

2015 ◽  
Vol 782 ◽  
pp. 130-136 ◽  
Author(s):  
Ping Zhou ◽  
Wei Guo Guo ◽  
Hai Hui Wu
Keyword(s):  
Flow Stress ◽  
Constitutive Model ◽  
Plastic Flow ◽  
Split Hopkinson Pressure Bar ◽  
Testing Machine ◽  
Experimental Results ◽  
Dynamic Strain ◽  
Strain Rates ◽  
Brass Alloy ◽  
Plastic Flow Stress

To explore the thermo-mechanical response of H96 brass alloy, the quasi-static (universal-testing machine) and dynamic (the split Hopkinson pressure bar apparatus) uniaxial compression experiments have been performed under the temperatures from 293 K to 873 K and the strain rates from 0.001 s-1 to 6000 s-1, and the strains over 60% are obtained. Results show that, H96 brass alloy has strong strain hardening behavior, and it becomes weaker with the increasing temperature. In addition, this alloy is sensitive to strain rates; and, it has temperature sensitivity, the dynamic strain aging occurs at the temperature of 473 K and a quasi-static strain rate of 0.001 s-1. Based on the thermal activation dislocation mechanism, paralleled with the experimental results, a plastic flow constitutive model with the physical conception is developed. The model is suitable to predict the plastic flow stress at different temperatures and strain rates. According to comparing results, the model predictions are in good agreement with the experimental results.

Measurement Procedure of Ring Motion with the Use of Highspeed Camera During Electromagnetic Expansion

2012 ◽  
Vol 19 (4) ◽  
pp. 797-804 ◽  
Author(s):  
Jacek Janiszewski
Keyword(s):  
Experimental Data ◽  
Flow Stress ◽  
Plastic Flow ◽  
High Speed ◽  
Optical Measurement ◽  
Measurement Procedure ◽  
Expansion Process ◽  
Calculation Results ◽  
Plastic Flow Stress ◽  
Ring Material

Abstract An optical measurement method of radial displacement of a ring sample during its expansion with velocity of the order 172 m/s and estimation technique of plastic flow stress of a ring material on basis of the obtained experimental data are presented in the work. To measure the ring motion during the expansion process, the Phantom v12 digital high-speed camera was applied, whereas the specialized TEMA Automotive software was used to analyze the obtained movies. Application of the above-mentioned tools and the developed measuring procedure of the ring motion recording allowed to obtain reliable experimental data and calculation results of plastic flow stress of a copper ring with satisfactory accuracy.

Flow Stress and Yield Point Observations on Normal and Superconducting Indium and Lead

1972 ◽  
Vol 50 (21) ◽  
pp. 2592-2595 ◽  
Author(s):  
T. S. Hutchison ◽  
S. L. McBride
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Experimental Evidence ◽  
Yield Point ◽  
Plastic Flow ◽  
Ultrasonic Attenuation ◽  
Stress Change ◽  
Plastic Flow Stress

Measurements of the plastic flow stress and 30 MHz ultrasonic attenuation in normal and superconducting 99.9999% pure In and Pb are presented. For both In and Pb, with a strain rate of 10−5 s−1, the attenuation change Δαsn takes about 3 s while the related flow stress change Δσsn takes about 30 s. In indium Δαns and Δσns are completed in about 40 s; in Pb the corresponding times are about 3 s or less. Experimental evidence is presented which shows unequivocally that the dislocation arrangements in the normal and superconducting states are different.

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