Results 281 to 290 of about 192,349 (314)
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Geometric Interpretation of Linear Viscoelasticity and Time-Temperature Superposition
AIP Conference Proceedings, 2008Dynamic moduli data are considered as a curve on the plane of loss tangent and storage modulus. The curve can be parameterized by the material frequency which is defined as the arc length of the curve. The relationship between real frequency and the material frequency determines the horizontal and vertical shift factors.
Kwang Soo Cho +6 more
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Time‐temperature superposition of the fundamental relaxation processes of polyethylene
Journal of Polymer Science: Polymer Symposia, 1974AbstractThe application of Tobolsky's time‐temperature superposition principle for the stress‐relaxation behavior of amorphous polymers is reviewed, and its extension to crystalline polymers and the employment of X‐ray and optical methods is discussed.
Richard S. Stein +3 more
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Time-Temperature and Time-Aggregate Gradation Superposition in Asphalt Mixes
Road Materials and Pavement Design, 2004This study was devoted to evaluate the effect of aggregate gradation, temperature, and type of asphalt cement on the permanent deformation of Hot-Mix Asphalt (HMA). An experimental program was conducted to characterize the viscoelastic deformation response of asphalt mixture using the static creep test.
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Time-Temperature Superposition in Linear and Non-linear Domain
Materials Today: Proceedings, 2016Long-term behavior of polymers and their composites is related mainly to their time-dependent mechanical properties, i.e. material functions or master curves, usually obtained by time-temperature superposition (tTS) principle. The “weakest” point utilizing tTS lies in “manual or hand” shifting procedure, which can lead to over- or under-estimated life ...
Marina Gergesova +3 more
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Time‐temperature superposition and physical aging in amorphous polymers
Polymer Engineering & Science, 1988AbstractIn the past, time‐temperature superposition has been used to extend the time scale of creep tests in polymers from the short times easily obtained in the laboratory to long times seen in actual use. A fundamental assumption of time‐temperature superposition is, however, that the polymer does not change in structure as a function of time ...
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Time‐temperature superposition for polypropylene
Journal of Polymer Science Part B: Polymer Letters, 1964R. Meredith, R. C. Laible
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Time-temperature superposition and relaxational behavior in polymeric glasses
Journal of Macromolecular Science, Part B, 1968It is shown that a free-volume treatment of the relaxational behavior of a polymer can be extended into the glassy region.
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Breakdown of time-temperature superposition in miscible polymer blends
Polymer, 1989Abstract The empirical principle of time-temperature superposition has been found to fail for a miscible blend of 20 weight% poly(ethylene oxide) in poly(methyl methacrylate). Oscillatory shear rheometry data is reported for this blend at four temperatures well above the glass transition temperature of the blend.
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Superposition‐based concurrent multiscale approaches for poromechanics
International Journal for Numerical Methods in Engineering, 2021Jacob Fish, Pengpeng Ni, Wei Sun
exaly