Results 261 to 270 of about 493,949 (310)

On serrated yielding and negative on strain-rate sensitivity

The Chemical Engineering Journal, 1966
Abstract Negative strain-rate sensitivity is shown to be a common feature in a variety of materials provided test conditions are chosen such that serrated yielding (the Portevin-Le Chatelier effect) occurs. An instability is shown to exist in the dislocation velocity ( v )- stress (τ) relation, which leads to negative values of ∂ log τ ∂
B.A. Wilcox, A.R. Rosenfield
openaire   +1 more source

Strain-rate sensitivity of zinc sheet

Metallurgical Transactions A, 1984
The flow stress of many commercial alloys depends on applied strain rate, and this dependence contributes to their resistance to strain localization (necking). Measurement of strain-rate sensitivity for these alloys is complicated by possible dependence on strain, strain rate, testing method, and method of analysis.
openaire   +1 more source

Material Strain Rate Sensitivity

2001
The theoretical analyses developed in chapter 1 have examined the influence of inertia on the response of an elementary structure subjected to dynamic loads which cause plastic behaviour. The yield criterion, which governs the plastic flow, was assumed to be independent of the rate of strain (\(\dot \varepsilon \)).
openaire   +1 more source

Strain rate sensitivity of a high strain rate superplastic TiNp/2014 Al composite

Journal of Materials Processing Technology, 2010
Abstract The effects of deformation temperature and strain in hot rolling deformation on strain rate sensitivity of the TiN p /2014 Al composite were studied by tensile tests conducted out at 773, 798, 818 and 838 K with the strain rates from 1.7 ×10 −3 to 1.7 × 10 0  s −1 .
H.E. Hu, L. Zhen, T. Imai
openaire   +1 more source

Strain-rate sensitivity of ultrafine-grained materials

Zeitschrift für Metallkunde, 2005
Abstract The strain-rate sensitivity of commercial purity Aluminium (Al 99.5) and of α-iron, with both conventional (CG) and ultrafine (UFG) grain sizes, are investigated by compression and tension tests at different temperatures. Microstructural investigations were performed before and after compression testing in order to investigate the ...
Höppel, H., May, J., Eisenlohr, P., Göken, M.   +3 more
openaire   +2 more sources

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
openaire   +1 more source

Strain Rate Sensitivity of Flow Stress at Very High Rates of Strain

1996
In 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
openaire   +1 more source

Strain-rate sensitive tough fibre-reinforced composites

Journal of Materials Science, 1977
A new type of composite was designed and tested which has greater fracture toughness under impact loading conditions than conventional fibre-reinforced composites. This composite is strain-rate sensitive and can be more than twice as tough as conventional composites having the same matrix and fibre.
Nak-Ho Sung, Terence J. Jones, Nam P. Suh   +2 more
openaire   +1 more source

Strain-Rate-Sensitive Constitutive Law for Concrete

Journal of Engineering Mechanics, 1999
Concrete strength is highly sensitive to loading procedure, especially in the range of high strain rates. On the basis of experimental results, it is demonstrated that the full loading history must be included in a dynamic constitutive model, not just consideration of the current strain rate.
Eibl, Josef, Schmidt-Hurtienne, Björn
openaire   +1 more source

Shear banding in non-uniform straining of ductile strain-rate sensitive materials—A steady strain-rate approximation

International Journal of Engineering Science, 1995
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +1 more source