Results 261 to 270 of about 99,751 (297)
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Nature, 1999
The sap in tall trees is thought to be under permanent tension. In the same way that some materials are only stable under high compression, Daedalus hopes to engineer new materials that are stable under strong tension. Such substances may show ‘anti-creep’, which could be exploited to make self-tightening materials.
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The sap in tall trees is thought to be under permanent tension. In the same way that some materials are only stable under high compression, Daedalus hopes to engineer new materials that are stable under strong tension. Such substances may show ‘anti-creep’, which could be exploited to make self-tightening materials.
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Journal of Biomedical Materials Research, 1979
AbstractGreep values of amalgam have been thought to be typical and nearly equal to their order of magnitude, depending on composition and particle shape. Recently it has been shown that trituration time may cause changes in creep magnitudes. The type of mixer and its frequency have contributed additional variabilities.
A G Bayer, H J Rehberg, U Gramberg
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AbstractGreep values of amalgam have been thought to be typical and nearly equal to their order of magnitude, depending on composition and particle shape. Recently it has been shown that trituration time may cause changes in creep magnitudes. The type of mixer and its frequency have contributed additional variabilities.
A G Bayer, H J Rehberg, U Gramberg
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Creep and creep-rupture of Alloy 617
Nuclear Engineering and Design, 2018Abstract The Ni-Cr-Mo-Co material Alloy 617 is the leading candidate for VHTR intermediate heat exchangers operating above 750 °C. Time-dependent properties are an important consideration in qualifying the alloy for construction of nuclear components.
T.M. Lillo +7 more
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A study of creep and creep rupture of polycarbonate [PDF]
Polymer Engineering & Science, 1995 AbstractThe creep characteristics of polycarbonate at elevated temperatures are investigated. The onset of glass transition temperature of polycarbonate is determined. An Arrhenius type relationship is used to describe the creep process and the concept of property retention index as applied to creep is discussed.
Richard C. Progelhof +1 more
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Impression creep; a new creep test
Journal of Materials Science, 1977A new indentation creep test is introduced in which the indenter is a circular cylinder with a flat end. Unlike conventional indentation tests, a steady-state velocity is observed in this new test shortly after a transient period during which the indenter makes a shallow impression on the surface of the specimen; hence the name “impression creep”. This
Jian Li, S. N. G. Chu
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1992
Creep is the continued slow straining of a material under constant load. Another phenomenon, related to creep, is relaxation. This is the reduction in the level of stress within a material with time when the strain is constant. Both creep and relaxation are of consequence with many thermoplastics at ordinary temperatures but do not become significant ...
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Creep is the continued slow straining of a material under constant load. Another phenomenon, related to creep, is relaxation. This is the reduction in the level of stress within a material with time when the strain is constant. Both creep and relaxation are of consequence with many thermoplastics at ordinary temperatures but do not become significant ...
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Creep and creep fracture of polycrystalline copper
Materials Science and Engineering: A, 2007Abstract Normal creep curves are recorded over extended stress ranges at 686–823 K for fine-grain copper. Analyses of the curve shape variations, together with the results of stress change experiments, do not support the view that a transition from dislocation to diffusional creep mechanisms occurs with decreasing stress.
A.J. Battenbough, B. Wilshire
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Creep Damage and Creep Rupture of Metals [PDF]
, 1990 The aim of this note is to present the theoretical model of a creep damage and creep rupture of metals. Constitutive equations describing these phenomena were formulated assuming that the tertiary creep is a result of stiffness and strength reduction of a material due to crack and void growth. A current state of the deteriorated material microstructure
Zdzisław Lis, Andrzej Litewka
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2004
Publisher Summary Nondislocation based diffusional creep at high temperatures and very low stresses in fine-grained materials was qualitatively suggested 50 years ago by Nabarro. This was rigorously (quantitatively) proposed and described by Herring.
M.-T. Perez-Prado, M.E. Kassner
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Publisher Summary Nondislocation based diffusional creep at high temperatures and very low stresses in fine-grained materials was qualitatively suggested 50 years ago by Nabarro. This was rigorously (quantitatively) proposed and described by Herring.
M.-T. Perez-Prado, M.E. Kassner
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Developments in assessing creep behaviour and creep life of components
Materials at High Temperatures, 2004Assessment of components for behaviour and life in the creep regime can arise both for as-new and inservice structures. The latter is generally more demanding, not only because of material ageing and possible growth of damage, but also due to frequently limited input information and less specific normative framework than for design.
Brown, T.B. +9 more
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