Results 271 to 280 of about 19,178,039 (347)

Effect of Strain Rate on the Stress-Strain Behavior of Sand

Journal of Geotechnical and Geoenvironmental Engineering, 2011
Drained triaxial compression tests on crushed coral sand were performed from near-static strain rates to very high strain rates (up to approximately 1,800%/s). Experiments were performed on dry, vacuum-confined axisymmetric specimens at two different confining pressures (98 and 350 kPa) and two different densities (Dr approximately 36 and 60%).
Jerry A. Yamamuro, Antonio E. Abrantes, Poul V. Lade   +2 more
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Strain Rate Effects in Composites

Applied Mechanics Reviews, 1997
A review of the high strain rate behavior of filamentary composite materials is presented. The experimental techniques used for evaluating the dynamic performance of composites are discussed, as well as results obtained by researchers for various types of filamentary composites. Areas of research needed for expanding the information base for composites
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Strain Rate and Strain Rate History Effects in Two Mild Steels.

1979
Abstract : Results are presented of a series of experiments performed with two steels to investigate the dependence of flow stress on strain rate and its history. For this purpose quasi-static, dynamic and incremental strain rate tests were conducted on SAE 1020 hot-rolled steel and SAE 1018 cold-rolled steel at room temperature. It is shown that while
J. Duffy, R. H. Hawley, M. L. Wilson
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The effects of strain and strain rate on residual microstructures in copper

Proceedings, annual meeting, Electron Microscopy Society of America, 1986
The strain rate sensitivity of a variety of materials is known to increase rapidly at strain rates exceeding ∼103 sec-1. This transition has most often in the past been attributed to a transition from thermally activated guide to viscous drag control. An important condition for imposition of dislocation drag effects is that the applied stress, σ, must ...
M. F. Stevens, P. S. Follansbee
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High strain rate effects on the strain of alloy steels

Journal of Materials Processing Technology, 1999
Abstract 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 Effects in Tungsten

JOM, 1956
The yield strength of annealed tungsten was found to have a strain rate exponent 12 times as great as that of low carbon steel. The effects of temperature and strain rate could be correlated through the Zener-Hollomon parameter with a heat of activation as-sociated with yielding of 32,000 cai per g-atom. This heat of activation is independent of strain
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Strain Rate Effects

1999
The mechanical properties of most materials vary with the rate of loading and this effect is particularly evident in polymers. It is usual when considering rate of loading effects in a material, rather than a structure, to quantify the loading rate in terms of a strain rate where the strain rate can conveniently be visualised as the number of times a ...
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Inverse Strain-Rate Effects

Journal of Applied Physics, 1969
Decrease of stress level at a given strain with increase of strain rate is discussed in terms of three theories: the Johnston-Gilman theory of yield and flow, diffusional aging mechanisms, and stress induced structural instability. None of these theories explain inverse rate effects.
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Strain rate and strain rate history effects on the dynamic behavior of metallic materials

International Journal of Solids and Structures, 1980
Abstract The constitutive equations for strain hardening (f.c.c. metals and alloys) and strain softening-hardening metallic materials (b.c.c. metals and alloys) have been developed. The development is within the framework of the endochronic theory of viscoplasticity. In this discussion, the intrinsic time is dependent on the plastic strain rate. The
Wu, Han C., Yip, M. C.
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Effect of strain rate on the electroplastic effect in Nb

Scripta Metallurgica, 1989
It has been found that the application of a high density electric current pulse during the plastic deformation of metals produces an enhancement of the deformation rate in addition to that caused by the side effects of the current such as Joule heating and the magnetic pinch effect. This additional effect has been termed an electroplastic effect (EPE).
Wei-di Cao, A.F. Sprecher, H. Conrad
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