Results 271 to 280 of about 8,661,099 (309)

Strain rate sensitivity of Cu with nanoscale twins

Scripta Materialia, 2006
The strain-rate sensitivity of ultrafine-crystalline Cu with different concentrations of nanoscale growth twins is investigated using tensile strain rate jump tests. Higher twin density leads to enhanced rate sensitivity, which decreases mildly with increasing strain rate and strain.
Y.F. Shen, L. Lu, M. Dao, S. Suresh
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On the strain rate sensitivity of HDPE/CaCO3 nanocomposites

Materials Science and Engineering: A, 2008
Abstract In the current study the role of both nano-sized calcium carbonate and strain rate on the tensile properties of HDPE was studied. For this purpose standard tensile samples of HDPE and HDPE/10 vol.% CaCO3 were performed using extrusion and injection molding methods. Tensile test was done at different strain rates.
S.M. Zebarjad, S.A. Sajjadi
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The origin of strain-rate sensitivity in OFHC copper

Metallurgical Transactions, 1973
This investigation was conducted to determine the nature of the strain-rate sensitivity of OFHC copper at room temperature. In particular, the relative magnitudes of the dynamic contribution (particle inertia, suppression of thermal assistance, and so forth) and the nondynamic contribution (namely, the accelerated rate of strain hardening observed at ...
Tom Glenn, Walter Bradley
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The Effect of a Lathyritic Diet on the Sensitivity of Tendon to Strain Rate

Journal of Biomechanical Engineering, 1985
While the tensile failure properties of rat-tail tendon depend on strain rate, the sensitivity to strain rate decreases with age, especially during sexual maturation. The object of this study was to determine the effect of an experimental model of chronic lathyrism on age-dependent changes in the sensitivity of developing tendon strength to strain rate.
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The strain-rate sensitivity of the hardness in indentation creep

Journal of Materials Research, 2007
Finite element analysis is used to simulate indentation creep experiments with a cone-shaped indenter. The purpose of the work is to help identify the relationship between the strain-rate sensitivity of the hardness, νH, and that of the flow stress, νσ in materials for which elastic deformations are significant.
A.A. Elmustafa, S. Kose, D.S. Stone
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The measurement of strain-rate sensitivity in superplastic alloys

Journal of Materials Science, 1971
The currently used methods of determining strain-rate sensitivities,m, of superplastic alloys from strain-rate change tests are examined and found to be unsatisfactory. The stressrelaxation method is also investigated and is shown to be applicable to the superplastic Al-Cu eutectic.
J. Hedworth, M. J. Stowell
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Hardness and strain rate sensitivity of nanocrystalline Cu

Scripta Materialia, 2006
The measured hardness of nanocrystalline Cu with grain sizes (( as small as 10 nm still follows the Hall-Petch relation. A rate sensitivity of 0.06 +/- 0.01 and a flow stress activation volume of 8b(3) were determined at d = 10 nm, suggesting grain boundary activities are enhanced but not yet dominant in the plastic deformation.
J. Chen, L. Lu, K. Lu
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Study on Strain-Rate Sensitivity of Cementitious Composites

Journal of Engineering Mechanics, 2010
In this study, we conduct a combined experimental and micromechanical investigation into the strain-rate sensitivity of concretes, with a special reference to the effect of aggregate concentration. We first measured the stress-strain relations of Type I portland cement with 0.45 water-to-cement ratio (w/c), and then those of the mortar containing sand ...
Huang-Hsing Pan, George J. Weng
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The Characterization of Materials by Precision Strain Rate Sensitivity

Journal of Engineering Materials and Technology, 1987
Strain rate sensitivity is a measurement of the thermodynamic response of materials to changes in stress (τ). Correlations of the theoretical derivations to measured values are only valid if the strain rate (γ˙) is performed at constant structure (Σ). Thus transients during strain rate change obliterate the subtleties of the data especially since the ...
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Impulsively Loaded Strain-Rate-Sensitive Plates

Journal of Applied Mechanics, 1967
The response of an impulsively loaded, isotropically rate-sensitive annular plate is calculated via “exact” and approximate viewpoints. For a typical example, numerical results differed by about 3 percent. The essence of the approximate approach, which represents a natural extension of a previous one-dimensional analysis [1], is that the initial stress
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