Material characterisation using high-temperature Split Hopkinson pressure bar

Kajberg, Jörgen; Sundin, Karl-Gustaf

doi:10.1016/j.jmatprotec.2012.11.008

Cited by 48 publications

(27 citation statements)

References 12 publications

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“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Usually, the high strain rate conditions are reached using the Hopkinson Bar system, while different heating systems are applied. Often the material heating occurs or by inserting the specimen in a furnace or using induction heating systems, as in this work, but also other methods are employed, as infrared heaters or radiant focus systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation of dynamic behaviour of copper at high temperature

Scapin

Peroni

Fichera

2014

Materials at High Temperatures

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In this work a complete study about the dynamic response of pure copper at high temperature is performed in tension, on dog bone specimens with cylindrical cross-section. The tensile tests varying the strain rate are performed from quasi-static to dynamic regime, covering six orders of magnitude. The heating of the specimens in quasi-static condition is obtained with an induction coil system, designed to concentrate the heat flux in the gage length of the specimen. The temperature range varies between 20 and 400uC. In the perspective to perform also tests in mixed loading conditions, in this work, a methodology for testing materials at high temperature and high strain rate is described. The method uses the standard Hopkinson Bar apparatus for direct tensile tests with the same heating system used in quasi-static tests. The obtained experimental results are analysed and finally compared with those available in the scientific literature.

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Section: Introductionmentioning

confidence: 99%

Investigation of dynamic behaviour of copper at high temperature

Scapin

Peroni

Fichera

2014

Materials at High Temperatures

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“…It has been shown that η depends on strain rate under isothermal conditions. For strain rates lower than 0.001 s -1 , η is around 0, and under adiabatic conditions and at strain rates greater than 10 s -1 , η reaches to 1 [15,21], a value that can be assumed for hot split Hopkinson bar tests. Therefore, the instantaneous temperature can be estimated from Eq.…”

Section: Data Correctionmentioning

confidence: 99%

“…Moreover, the recorded deformation load is only valid for the initial strains, although sample experiences strain until end of the test [12]. Therefore, different constitutive equations including Johnson-Cook [13], Zerilli-Armstrong [14], Hensel-Spittel [15] have been examined to reproduce the suitable flow curves at high strain rates. According to the rate of deformation, adiabatic heating and strain rate variation are unavoidable, and their effects should be corrected to make flow stress curves valid.…”

Section: Introductionmentioning

confidence: 99%

Dynamic deformation response of Al-Mg and Al-Mg/B4C composite at elevated temperatures

Rezayat

Parsa

Mirzadeh

et al. 2018

Materials Science and Engineering: A

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The dynamic deformations at high temperatures of Al-3wt.%Mg alloy and Al-3wt.%Mg/B 4 C composites with different volume fractions and particle sizes were studied using a dilatometer deformation instrument and a split Hopkinson pressure bar operating at strain rates of 10 to 1000 1/s. A comprehensive analytical procedure was developed to correct the effects of adiabatic heating, friction at interface of the specimen and bars, and strain rate variation, on flow stress curves. Then based on corrected data, a physical based constitutive equation was developed for modeling and prediction of flow stress. It was observed that composites in comparison with single phase alloy, after initial straining, showed lower hardening rate which is unexpected. EBSD micrographs and finite element analysis were used to investigate microstructural evolution and deformation condition around particles. It was concluded that particle fracture during deformation which is more expectable in larger particles, and also higher adiabatic heating in composite and not recrystallization related phenomena, are the main reasons for softening of stress flow curves at large deformation.

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“…Therefore, in order to obtain various performance parameters of magnesium alloy at high strain rate, in addition to mastering the deformation mechanism of magnesium alloy under quasi-static load conditions, it is necessary to study their organization evolution and mechanism performance under the conditions of high-speed impact. The research results of high-speed impact can provide references for the parameters of magnesium alloy components in automotive, aerospace, and other fields, it will effectively reduce the serious accidents such as fracture of these components under the high-speed impact and increase the reliability and working life of high-speed vehicle which used a large amount of magnesium alloy materials [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study on modified Johnson-Cook constitutive material model to predict the dynamic behavior Mg-1Al-4Y alloy

Wang

Yuan

Jin

et al. 2020

Mater. Res. Express

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An accurate prediction of high speed impact behavior of metals by considering the combined effects of strain, strain rate and temperature is essential for understanding dynamic impact deformation of metals. To understand the effect of strain, strain rate and temperature on the high-speed impact behavior of Mg-1Al-4Y alloy, the dynamic impact compression experiments for Mg-1Al-4Y alloy were carried out by split Hopkinson pressure bar (SHPB). The mechanical properties of Mg-1Al-4Y alloy specimens were studied at different strain rate and temperature. The number of {10-12} extension twins decreases with the strain rate increasing from the electron backscatter diffraction (EBSD) technology, because of the formation of extension twins is suppressed with the strain rate increases, and dislocations become the main mode of dominant deformation. It is also found that the increase of strain rate has a positive effect on the strength of the material. But, the temperatures have a negative impact on the strength of the material. A modified Johnson-cook model has been presented, which shows good predictions with experimental results at different strain rates and temperatures. Especially, the predictions of the Johnson-cook equation are completely consistent with experimental results in small deformation stage.

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Material characterisation using high-temperature Split Hopkinson pressure bar

Cited by 48 publications

References 12 publications

Investigation of dynamic behaviour of copper at high temperature

Investigation of dynamic behaviour of copper at high temperature

Dynamic deformation response of Al-Mg and Al-Mg/B4C composite at elevated temperatures

Study on modified Johnson-Cook constitutive material model to predict the dynamic behavior Mg-1Al-4Y alloy

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