Deformation mechanisms of an Ω precipitate in a high-strength aluminum alloy subjected to high strain rates

2011 ◽  
Vol 26 (4) ◽  
pp. 487-497 ◽  
Author(s):  
K. Elkhodary ◽  
W. Lee ◽  
L.P. Sun ◽  
D.W. Brenner ◽  
M.A. Zikry
Keyword(s):  
Aluminum Alloy ◽  
High Strain ◽  
High Strength ◽  
Deformation Mechanisms ◽  
Strain Rates ◽  
High Strain Rates ◽  
High Strength Aluminum Alloy ◽  
Image Position

Abstract

Flow behavior and microstructure evolution of 7055 aluminum alloy impacted at high strain rates

2016 ◽  
Vol 677 ◽  
pp. 203-210 ◽  
Author(s):  
Shengdan Liu ◽  
Shaoling Wang ◽  
Lingying Ye ◽  
Yunlai Deng ◽  
Xinming Zhang
Keyword(s):  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
High Strain ◽  
Flow Behavior ◽  
Strain Rates ◽  
High Strain Rates ◽  
7055 Aluminum Alloy

Comparative Study of the Dynamic Behavior of AA2519 Aluminum Alloy in T6 and T8 Temper Conditions

2019 ◽  
Author(s):  
Adewale Olasumboye ◽  
Gbadebo Owolabi ◽  
Olufemi Koya ◽  
Horace Whitworth ◽  
Nadir Yilmaz
Keyword(s):  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Stress Response ◽  
Flow Stress ◽  
Yield Strength ◽  
Strain Rate ◽  
High Strain ◽  
Second Phase ◽  
Strain Rates ◽  
High Strain Rates

Abstract This study investigates the dynamic response of AA2519 aluminum alloy in T6 temper condition during plastic deformation at high strain rates. The aim was to determine how the T6 temper condition affects the flow stress response, strength properties and microstructural morphologies of the alloy when impacted under compression at high strain rates. The specimens (with aspect ratio, L/D = 0.8) of the as-cast alloy used were received in the T8 temper condition and further heat-treated to the T6 temper condition based on the standard ASTM temper designation procedures. Split-Hopkinson pressure bar experiment was used to generate true stress-strain data for the alloy in the range of 1000–3500 /s strain rates while high-speed cameras were used to monitor the test compliance with strain-rate constancy measures. The microstructures of the as received and deformed specimens were assessed and compared for possible disparities in their initial microstructures and post-deformation changes, respectively, using optical microscopy. Results showed no clear evidence of strain-rate dependency in the dynamic yield strength behavior of T6-temper designated alloy while exhibiting a negative trend in its flow stress response. On the contrary, AA2519-T8 showed marginal but positive response in both yield strength and flow behavior for the range of strain rates tested. Post-deformation photomicrographs show clear disparities in the alloys’ initial microstructures in terms of the second-phase particle size differences, population density and, distribution; and in the morphological changes which occurred in the microstructures of the different materials during large plastic deformation. AA2519-T6 showed a higher susceptibility to adiabatic shear localization than AA2519-T8, with deformed and bifurcating transformed band occurring at 3000 /s followed by failure at 3500 /s.

Compressive Behavior of Plain and Fiber-Reinforced High-Strength Concrete Subjected to High Strain Rate Loading

2011 ◽  
Vol 82 ◽  
pp. 57-62 ◽  
Author(s):  
Sha Sha Wang ◽  
Min Hong Zhang ◽  
Ser Tong Quek
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strength Concrete ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
High Strength ◽  
Strain Rates ◽  
Compressive Behavior ◽  
High Strain Rates ◽  
Strength Concrete

This paper presents a laboratory experimental study on the effect of high strain rate on compressive behavior of plain and fiber-reinforce high-strength concrete (FRHSC) with similar strength of 80-90 MPa. Steel fibers, polyethylene fibers, and a combination of these were used in the FRHSC. A split Hopkinson pressure bar equipment was used to determine the concrete behavior at strain rates from about 30 to 300 s-1. The ratio of the strength at high strain rates to that at static loading condition, namely dynamic increase factor (DIF), of the concretes was determined and compared with that recommended by CEB-FIP code. Fracture patterns of the specimens at high strain rates are described and discussed as well. Results indicate that the CEB-FIP equation is applicable to the plain high strength concrete, but overestimates the DIF of the FRHSC at strain rates beyond a transition strain rate of 30 s-1. Based on the experimental results, a modified equation on DIF is proposed for the FRHSC.

A modified Johnson–Cook model for tensile flow behaviors of 7050-T7451 aluminum alloy at high strain rates

2015 ◽  
Vol 631 ◽  
pp. 214-219 ◽  
Author(s):  
Jin Qiang Tan ◽  
Mei Zhan ◽  
Shuai Liu ◽  
Tao Huang ◽  
Jing Guo ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Cook Model

scholarly journals Shear strain localization in AA 2219-T8 aluminum alloy at high strain rates

2016 ◽  
Vol 655 ◽  
pp. 212-220 ◽  
Author(s):  
G.M. Owolabi ◽  
D.T. Bolling ◽  
A.A. Tiamiyu ◽  
R. Abu ◽  
A.G. Odeshi ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Shear Strain ◽  
Strain Localization ◽  
High Strain ◽  
Strain Rates ◽  
High Strain Rates

A study on the constitutive equation of HC420LA steel subjected to high strain rates

2019 ◽  
Vol 34 (6) ◽  
pp. 1034-1042 ◽  
Author(s):  
Junjia Cui ◽  
Qiong Wang ◽  
Dongying Dong ◽  
Hao Jiang ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Constitutive Equation ◽  
High Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Image Position

Abstract

Mechanical Behavior of Advanced High Strength Steel at High Strain Rates

2011 ◽  
Vol 82 ◽  
pp. 178-183 ◽  
Author(s):  
Nilamber Kumar Singh ◽  
Ezio Cadoni ◽  
Maloy K. Singha ◽  
Narinder K. Gupta
Keyword(s):  
Mechanical Behavior ◽  
High Strength Steel ◽  
High Strain ◽  
Testing Machine ◽  
High Strength ◽  
Strain Rates ◽  
Advanced High Strength Steel ◽  
High Strain Rates ◽  
Loading Rates ◽  
Universal Testing

This paper presents the mechanical behavior of advanced high strength steel, Dual Phase 1200 steel (DP1200) at high strain rates (250s-1- 750s-1) under tensile loading. The mechanical behavior of materials depends on the loading rates. The accurate knowledge of the mechanical behavior of materials at high strain rates is essential in order to improve the safety against crash, impacts and blast loads. High strain rate experiments are performed on modified Hopkinson bar (MHB) apparatus; however, some quasi-static (0.001s-1) tests are also conducted on electromechanical universal testing machine at tensile loads. Based on the experimental results, the material parameters of the existing Cowper-Symonds and Johnson-Cook models are determined. These models fit the experimental data well and hence can be recommended for the numerical simulation of the problems involving this material at high strain rates.

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