scholarly journals Properties and Structure of X30MnAlSi26-4-3 High Strength Steel Subjected to Dynamic Compression Processes

2017 ◽  
Vol 62 (4) ◽  
pp. 2255-2260 ◽  
Author(s):  
A. Śmiglewicz ◽  
M. Jabłońska ◽  
W. Moćko ◽  
K. Kowalczyk ◽  
E. Hadasik
Keyword(s):  
Plastic Deformation ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
True Strain ◽  
High Strength ◽  
Hopkinson Pressure Bar ◽  
Structure Changes ◽  
Split Hopkinson ◽  
Bar Test ◽  
Pressure Bar

Abstract The paper presents the results of investigation on X30MnAlSi26-4-3 austenitic steel subjected to dynamic compression using the split Hopkinson pressure bar. The strain rate was 3700 s−1. The compression test was also carried out without the use of breaking rings and then true strain was about 0.3. The split Hopkinson pressure bar test take only few milliseconds to complete during which time it is impossible to transfer the excess heat out of the specimen, therefore the test must be carried out in adiabatic conditions and so the increase of the temperature caused by the work of plastic deformation had to be calculated. The stepping load method was used in order to evaluate the effect of adiabatic heating on the properties of steel which allowed to maintain the isothermal deformation conditions. The paper presents the comparison of results obtained during deformation under adiabatic and isothermal conditions in correlation to structure changes occurring in course of dynamic compression.

Dynamic Response and Fracture of High Strength Boride/Alumina Ceramic Composite

2006 ◽  
Vol 326-328 ◽  
pp. 1573-1576
Author(s):  
Dong Feng Cao ◽  
Li Sheng Liu ◽  
Jiang Tao Zhang
Keyword(s):  
Dynamic Response ◽  
Ceramic Composite ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
High Strength ◽  
Alumina Ceramic ◽  
Hopkinson Pressure Bar ◽  
Dynamic Loadings ◽  
Split Hopkinson ◽  
Pressure Bar

Dynamic response and fracture of high strength boride/alumina ceramic composite were investigated by split Hopkinson pressure bar (SHPB) experiment in this paper. The compressive stress–strain curves and dynamic compression strength of the composites were tested. The surface’s microstructure of fractured composites were examined by using scanning electron microscope (SEM) to investigate the fracture mechanism. The results show that boride/alumina has high dynamic compressive strength and high Young’s modulus. The main fracture mode of the material is the fracture of the ceramic grains. The micro-voids and flaws, generated during the sintering and manufacturing of material and mechanical process of specimen, decrease the strength of the material because they provide the source of crack expansion when the material undergoes the dynamic loadings.

Dynamic compressive properties obtained from a split Hopkinson pressure bar test of Boryeong shale

2016 ◽  
Vol 22 (5) ◽  
pp. 764-770 ◽  
Author(s):  
Minju Kang ◽  
Jung-Woo Cho ◽  
Yang Gon Kim ◽  
Jaeyeong Park ◽  
Myeong-Sik Jeong ◽  
...  
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Compressive Properties ◽  
Split Hopkinson ◽  
Bar Test ◽  
Pressure Bar

Construction of Johnson-Cook Model for Gr2 Titanium through Adiabatic Heating Calculation

2014 ◽  
Vol 487 ◽  
pp. 7-14 ◽  
Author(s):  
Xi Guang Deng ◽  
Song Xiao Hui ◽  
Wen Jun Ye ◽  
Xiao Yun Song
Keyword(s):  
Split Hopkinson Pressure Bar ◽  
Heating Temperature ◽  
Dynamic Compression ◽  
Adiabatic Heating ◽  
Model Fit ◽  
Testing System ◽  
Compression Tests ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar

This study derived the five parameters in Johnson-Cook equation of CP titanium Gr2. Quasi-static and dynamic compression tests were designed to measure mechanical properties at strain rates of 10-3s-1 and 6000s-1. In order to secure the validity of tested data, a novel fixture was proposed to reduce the displacement measurement error in MTS testing system and the signal processing procedure of compressive split Hopkinson pressure bar for the present study was demonstrated. With the tested data and calculated adiabatic heating temperature rise, parameters A, B, n, m, C have been derived based on mathematical deduction and solve. It was found that the constructed constitutive model fit the tested data well and was able to restore the yield strength value at high strain rate.

A comparative study on dynamic mechanical performance of concrete and rock

2015 ◽  
Author(s):  
Xia Zhengbing ◽  
Zhang Kefeng ◽  
Deng Yanfeng ◽  
Ge Fuwen
Keyword(s):  
Mechanical Performance ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Compression ◽  
Peak Strain ◽  
Hopkinson Pressure Bar ◽  
Dynamic Mechanical ◽  
Strain And Strain Rate ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Relationship Of

Recently, engineering blasting is widely applied in projects such as rock mineral mining, construction of underground cavities and field-leveling excavation. Dynamic mechanical performance of rocks has been gradually attached importance both in China and abroad. Concrete and rock are two kinds of the most frequently used engineering materials and also frequently used as experimental objects currently. To compare dynamic mechanical performance of these two materials, this study performed dynamic compression test with five different strain rates on concrete and rock using Split Hopkinson Pressure Bar (SHPB) to obtain basic dynamic mechanical parameters of them and then summarized the relationship of dynamic compressive strength, peak strain and strain rate of two materials. Moreover, specific energy absorption is introduced to confirm dynamic damage mechanisms of concrete and rock materials. This work can not only help to improve working efficiency to the largest extent but also ensure the smooth development of engineering, providing rich theoretical guidance for development of related engineering in the future.

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