Results 281 to 290 of about 98,472 (317)
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Breakdown of Time−Temperature Superposition Principle and Universality of Chain Dynamics in Polymers
Macromolecules, 2006Detailed comparison of temperature dependences of segmental (τα) and chain (τn) relaxation times shows that decoupling of these relaxation processes occurs (the ratio τn/τα starts to drop) at a similar range of τα ∼ 10-5−10-7 s regardless of a polymer and its molecular weight.
Alexei P. Sokolov, Yifu Ding
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A lifetime prediction of PV encapsulant and backsheet via time temperature superposition principle
2009 34th IEEE Photovoltaic Specialists Conference (PVSC), 2009To ensure the longevity and reliability of solar modules, the PV industry has adopted a series of accelerated aging tests. Among these tests, damp heat test performed at 85°C, 85% relative humidity for 1000 hrs provides important information on the degradation of encapsulant and backsheet materials.
John H. Wohlgemuth +2 more
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Journal of Materials in Civil Engineering, 2017
AbstractThe linear amplitude sweep (LAS) test has been proposed for fatigue specifications of asphalt binders. Recently, a newly developed fatigue failure definition and energy-based failure criterion have been proposed for improving the LAS procedure and data interpreting; however, these improvements only affect LAS data conducted at a constant ...
Y. Richard Kim +3 more
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AbstractThe linear amplitude sweep (LAS) test has been proposed for fatigue specifications of asphalt binders. Recently, a newly developed fatigue failure definition and energy-based failure criterion have been proposed for improving the LAS procedure and data interpreting; however, these improvements only affect LAS data conducted at a constant ...
Y. Richard Kim +3 more
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Describing Relaxation Behavior of Metal Seals Using Time-Temperature Superposition Principle
Journal of Engineering Mechanics, 2018AbstractIn order to study the time- and temperature-dependent long-term behavior of metal seals, experimental investigations on special metal seals have been carried out at five different temperatu...
Linan Qiao +2 more
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AIP Conference Proceedings, 2019
Time-temperature superposition principle has been utilized for the study on viscoelastic properties of phase-separated hydrogels. Hydrogels were prepared by interactions of biopolymers (negatively charged hyaluronan or positively charged diethylaminoethyl-dextran) with oppositely charged surface active agents (Septonex or Sodium dodecyl sulfate).
Martin Kadlec +2 more
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Time-temperature superposition principle has been utilized for the study on viscoelastic properties of phase-separated hydrogels. Hydrogels were prepared by interactions of biopolymers (negatively charged hyaluronan or positively charged diethylaminoethyl-dextran) with oppositely charged surface active agents (Septonex or Sodium dodecyl sulfate).
Martin Kadlec +2 more
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Key Engineering Materials, 2007
The uniaxial tensile creep of a commercial grade Poly(methyl methacrylate) was measured for 4000 seconds under various temperatures and stress levels ranging from 14 oC to 26 oC and 6 MPa to 32 MPa. The resultant creep compliance curves depart from each other for stresses beyond a critical value which varies with temperature, indicating nonlinear ...
Wenbo Luo, Chu Hong Wang, Rong Guo Zhao
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The uniaxial tensile creep of a commercial grade Poly(methyl methacrylate) was measured for 4000 seconds under various temperatures and stress levels ranging from 14 oC to 26 oC and 6 MPa to 32 MPa. The resultant creep compliance curves depart from each other for stresses beyond a critical value which varies with temperature, indicating nonlinear ...
Wenbo Luo, Chu Hong Wang, Rong Guo Zhao
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Time-temperature superposition principle on relaxational behavior of wood as a multi-phase material
Holz als Roh- und Werkstoff, 1995The time-temperature superposition principle of wood is discussed by modeling the relaxation spectrum of wood and then the application is examined, considered a high order structure and a multi-phase system for wood. The relaxation spectrum of wood was theoretically derived on the several assumptions.
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Materials Science Forum, 2018
The approach suggested in this analysis stems from basic material science laws and considers that any environmental degradation of polymer composites ultimately consists in chemical link and cohesion force alteration. Such alteration leads to the modification of material viscoelastic characteristics that can be measured through stress relaxation or ...
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The approach suggested in this analysis stems from basic material science laws and considers that any environmental degradation of polymer composites ultimately consists in chemical link and cohesion force alteration. Such alteration leads to the modification of material viscoelastic characteristics that can be measured through stress relaxation or ...
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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