Results 221 to 230 of about 517,545 (268)

Strain-rate sensitivity index of thermoplastics

Journal of Materials Science, 1993
Strain-rate sensitivity index, m, values of several thermoplastics (HDPE, PP, PMMA, PS, PVC, PC, and PA) were determined at ambient temperature by both variable strain-rate and stressrelaxation methods. Specimens were loaded in tension in the elastic portion of the stress-strain curve at various strain rates and the load was recorded as a function of ...
D. L. Goble, E. G. Wolff
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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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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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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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Limit strains in the sheet forming of strain and strain-rate sensitive materials

Journal of Mechanical Working Technology, 1985
Abstract Forming-limit diagrams are a convenient way of displaying the limits of performance of a sheet material in pressing and stamping: they represent the limiting combination of strains after which unacceptable necks are formed in the material.
J.D. Bressan, J.A. Williams
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Strain-rate sensitivity of the rabbit MCL diminishes at traumatic loading rates

Journal of Biomechanics, 2002
This study was performed to determine whether the viscoelastic behavior of ligaments persists at high rates of loading, such as those associated with sports-related trauma or motor vehicle accidents. Medial collateral ligaments (MCLs) from 22 skeletally mature New Zealand White rabbits were tensile tested quasi-statically and via two impact conditions ...
Joseph J, Crisco, Douglas C, Moore, Robert D, McGovern   +2 more
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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 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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Limit strain predictions for strain-rate sensitive anisotropic sheets

International Journal of Mechanical Sciences, 1980
Abstract The combined effects of material strain-rate sensitivity and anisotropy on necking or “limit” strain predictions are examined for thin sheets with transversely isotropic properties. Various rate dependent constitutive laws based on flow theory and deformation theory of plasticity are considered.
Neale, K. W., Chater, E.
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