Results 221 to 230 of about 512,401 (269)

Development of equations for strain rate sensitivity of UFG aluminum as a function of strain rate

International Journal of Plasticity, 2017
Abstract Strain rate sensitivity ( m -value) of ultrafine grain (UFG) AA 1050 and AA 5052 sheets processed by accumulative roll-bonding is investigated versus strain rate by stress relaxation (SR) test at ambient temperature. The results show a weak viscous nature of deformation for AA 5052 specimens as compared to AA 1050 ones.
Mohammad Sadegh Mohebbi, Abbas Akbarzadeh   +1 more
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The strain-rate sensitivity of α-uranium

Journal of the Mechanics and Physics of Solids, 1959
Abstract Experiments are described in which specimens from two different batches of uranium were subjected to both static and dynamic compression tests. From such tests static and dynamic stress-strain curves were obtained. These stress-strain curves indicate that α-uranium is slightly strain-rate sensitive; for instance, the effect of increasing ...
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CONSTITUTIVE MODELLING OF STRAIN RATE SENSITIVITY

1993
Conventional treatment of strain rate sensitivity measurements from strain change tests involving graphical method is examined. The resultant strain rate sensitivity was found to depend strongly on the magnitude of the change in crosshead velocity. Furthermore, the graphical method is unable to account for the instantaneous strain rate sensitivity ...
C.P. Ling, P.G. McCormick
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Strain-rate sensitivity of glasses

2017
Although glasses are commonly thought of as ideal brittle materials, a local plastic deformation can be induced by the penetration of sharp objects, such as the indenter tips commonly employed for hardness testing. Since the first experimental verification of this phenomenon, considerable research effort has been devoted to the underlying microscopic ...
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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
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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.
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The extrusion force and the mean strain rate during the extrusion of strain rate sensitive materials

Metallurgical Transactions, 1970
The force required to extrude a strain rate sensitive material under conditions of homogeneous deformation is calculated by the uniform work method. The force is shown to be a strong function of the rate sensitivity of the material. A new definition of the mean strain rate during extrusion is proposed, which is particularly appropriate to rate ...
T. Chandra, J. J. Jonas
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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 (\(\dot \varepsilon \)).
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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
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The strain rate sensitivity values in superplastic deformation

Materials Science and Engineering, 1985
Abstract Fine-grained superplastic α-β Ti-6Al-4V alloy (where the alloy composition is given in approximate weight per cent) was deformed in the temperature range 750–925°C and at strain rates of 10−5 −2 × 10−3 s−1. The results indicate that an increase in the deformation temperature or a decrease in the deformation rate is followed by an increase in
Giora Gurewitz, Amiya K. Mukherjee
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