Results 191 to 200 of about 2,568,150 (244)
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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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Strain localization in polycarbonates deformed at high strain rates
Journal of Polymer Engineering, 2011Abstract We studied three-dimensional transient large coupled thermomechanical deformations of a polycarbonate (PC) plate with a through-the-thickness inhomogeneity at its centroid. The PC exhibits strain softening followed by strain hardening and its elastic moduli are taken to be functions of strain rate and temperature. The inhomogeneity
Anoop G. Varghese, Romesh C. Batra
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Stress–Strain Behavior of SAC305 at High Strain Rates
Journal of Electronic Packaging, 2015Electronic products are subjected to high G-levels during mechanical shock and vibration. Failure-modes include solder-joint failures, pad cratering, chip-cracking, copper trace fracture, and underfill fillet failures. The second-level interconnects may be experience high strain rates and accrue damage during repetitive exposure to mechanical shock ...
Pradeep Lall +3 more
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