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High-strain, high-strain-rate behavior of tantalum
Metallurgical and Materials Transactions A, 1995Tantalum plate produced by a forging-rolling sequence was subjected to high plastic shear strains(γ = 1 → 5.5) at high strain rates (∼4 × 104 s-1) in two experimental configurations: (a) a special hat-shaped geometry and (b) thin disks deformed in a split Hopkinson bar.
M. A. Meyers +3 more
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A high-strain-rate superplastic ceramic
Nature, 2001High-strain-rate superplasticity describes the ability of a material to sustain large plastic deformation in tension at high strain rates of the order of 10-2 to 10-1 s-1 and is of great technological interest for the shape-forming of engineering materials. High-strain-rate superplasticity has been observed in aluminium-based and magnesium-based alloys.
B N, Kim, K, Hiraga, K, Morita, Y, Sakka
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Microstructure of high-strain, high-strain-rate deformed tantalum
Acta Materialia, 1998Abstract Hat-shaped specimens of polycrystalline tantalum are subjected to high plastic shear strains (γ = 170–910%) at strain rates exceeding 5 × 104/s in a compression split Hopkinson bar. The dynamic shear tests are performed at room and 600 K initial temperatures, under adiabatic and quasi-isothermal conditions, using UCSD's recovery Hopkinson ...
Sia Nemat-Nasser +2 more
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High-rate decremental-strain-rate test
Experimental Mechanics, 1988A modified torsional split-Hopkinson bar is intoduced and used to study material response associated with a sudden reduction of stain rate during high-rate plastic deformation. In tests on 1100-0 aluminum iniial deformation at a strain rate of approximately 2400 s−1 is reduced by a factor of 15 after 200 μs of high-rate deformation. After the reduction,
A. Gilat, Y. H. Pao
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Philosophical Magazine A, 1978
Abstract A method of calculating the distribution, and its time dependence, of temperature, strain rate and strain in plastically deforming metals is presented. It is assumed that the strain rate y depends on stress T and temperature T as γ = (const) Tm exp (-E/RT) where m, E and R are constants.
M. Wada, T. Nakamura, N. Kinoshita
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Abstract A method of calculating the distribution, and its time dependence, of temperature, strain rate and strain in plastically deforming metals is presented. It is assumed that the strain rate y depends on stress T and temperature T as γ = (const) Tm exp (-E/RT) where m, E and R are constants.
M. Wada, T. Nakamura, N. Kinoshita
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High strain rate testing of solder interconnections
Soldering & Surface Mount Technology, 2005PurposeThis paper aims to present a new micro‐impact tester developed for characterizing the impact properties of solder joints and micro‐structures at high‐strain rates, for the microelectronic industry, and the results evaluated for different solder ball materials, pad finishes and thermal histories by using this new tester. Knowledge of impact force
K.t. Tsai, F. Liu, E.h. Wong, R. Rajoo
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Mechanical Behavior of Nanocrystalline Palladium at High Strains and High Strain Rates
Materials Science Forum, 2008We suggest a simple method to study the mechanical behaviour of nanocrystalline (nc) samples in compression-torsion mode. High applied pressure prevents the fracture of sample, and quantitative parameters of sample response during torsion test can be compared with developed microstructure.
Ivanisenko, Y., Fecht, H. J.
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High strain rate effects on the strain of alloy steels
Journal of Materials Processing Technology, 1999Abstract The effect of high strain rates in both compression and torsion was studied on several micro-alloyed steels. The high strain rates were obtained using both a torsion and a compression Split Hopkinson Bar, which are capable of producing strain rates in excess of 10 3 s −1 .
M. Nabil Bassim, N. Panic
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Strain Rate Sensitivity of Flow Stress at Very High Rates of Strain
1996In order to clarify the mechanism of the steep rise in the flow stress, widely seen in metallic materials at strain rates above about 5×103/sec, two strain rate change tests were conducted. The strain rate reduction test was made for polycrystalline aluminium, copper, iron and niobium at strain rates up to about 2×104/sec.
J. Shioiri, K. Sakino, S. Santoh
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Stress-strain behavior of sand at high strain rates
International Journal of Impact Engineering, 2012Abstract A review of the response of sand under high strain rate (HSR) loading is presented. The response observed in HSR uniaxial compression tests, split-hopkinson pressure bar (SHPB) tests, and triaxial tests is investigated. Previous monotonic HSR tests have been reviewed, summarized, and combined in order to illustrate the effects of HSR loading
Mehdi Omidvar +2 more
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