Results 181 to 190 of about 1,554 (222)

A study of premachined hole growth in superplastic materials

Materials & Design, 2003
Abstract Because of cavities nucleation at the grain boundaries and their subsequent growth and coalescence large number of alloys show premature failure during superplastic flow. In this paper, the authors will introduce the study of the growth of void intentionally premachined on specimen subject to tensile test: in particular the effects of the ...
GIULIANO, Gillo, CARRINO L., NAPOLITANO G.   +2 more
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Superplasticity in Geological Materials

MRS Proceedings, 1990
ABSTRACTThe term “superplasticity” is taken as meaning high-strain-rate-sensitivity flow when it is used in geological contexts involving predominantly compressive stress states. Such flow has been observed in calcite and olivine polycrystalline aggregates in laboratory tests and the mechanism deduced to be diffusion-controlled granular flow.
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Fine‐structure superplasticity in materials

Journal of the Chinese Institute of Engineers, 1998
Abstract Superplastic forming is a viable net‐shape forming technology. It is an attractive manufacturing technique because it bypasses machining, joining and riveting, and reduces material waste. This paper reviews the history and progress in the field of superplasticity.
Tai‐Gang Nieh, Jeffrey Wadsworth
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Superplasticity in Nanostructured Materials

2020
Superplasticity is largely enhanced by decreasing the grain size to UFG and NC regimes. The constitutive equations describing the dependence of the different mechanisms acting during deformation as a function of grain size are described in this chapter. The diffusivity varying with the different grain size regimes is shown.
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Modeling of superplastic structural materials

Russian Engineering Research, 2017
The boundary problem in the mechanics of superplasticity is formulated on the basis of a standard superplasticity power law and the Perzyna viscoplasticity model. Methods of identifying these models on the basis of the same input data are proposed.
V. R. Ganieva, O. P. Tulupova, F. U. Enikeev, A. A. Kruglov   +3 more
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Superplastic Forming of Aerospace Materials

2016
This chapter discusses the phenomenon of superplasticity, as seen in different materials such as metals/alloys, intermetallics, ceramics, bulk metallic glasses and composites. The phenomenon of low temperature/high strain rate superplasticity is also briefly discussed. The various forming operations and the recent developments in forming processes like
K. A. Padmanabhan, S. Balasivanandha Prabu, S. Madhavan   +2 more
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Constitutive behavior of superplastic materials

International Journal of Non-Linear Mechanics, 2002
Superplasticity is an intriguing inelastic process in solid materials with deformation upto several thousand percent. Forming sheet and bulk materials using superplastic forming has become an established manufacturing method in aerospace and lately in other industries.
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Plasticity and superplasticity of advanced materials

Advanced Performance Materials, 1995
In this paper, some of the recent research progress on advanced materials supported by National Advanced Materials Committee of China are reviewed. The basic characteristics of plasticity and superplasticity, such as stress-strain curves, strain rate,m-value etc. are discussed.
C. G. Li, L. K. Shi
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Mechanism of Superplastic Deformation of Coarse-Grained Materials

physica status solidi (a), 1982
An investigation is made of microstructural changes occurring during the superplastic flow, contribution of grain boundary sliding (GBS) and intragrain deformation (IGD) to overall deformation are estimated, a study is made of deformation mechanisms, and intimate relationship between deformation processes and pore formation is determined on the coarse ...
R. I. Kuznetsova, N. N. Zhukov, O. A. Kaibyshev, R. Z. Valiev   +3 more
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Failure mechanisms in superplastic AA5083 materials

Metallurgical and Materials Transactions A, 2006
The mechanisms of tensile failure in four 5083 aluminum sheet materials are evaluated under conditions of interest for superplastic and quick-plastic forming. Two mechanisms are shown to control failure of the AA5083 materials under uniaxial tension at elevated temperatures: cavitation and flow localization (i.e., necking). Conditions for which failure
Kulas, Mary-Anne, Green, W. Paul, Taleff, Eric M., Krajewski, Paul E., McNelley, Terry R.   +4 more
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