The time–temperature superposition principle is a concept in polymer physics and in the physics of glass-forming liquids. This superposition principle is used to determine temperature-dependent mechanical properties of linear viscoelastic materials from known properties at a reference temperature. The elastic moduli … See more Consider a viscoelastic body that is subjected to dynamic loading. If the excitation frequency is low enough the viscous behavior is paramount and all polymer chains have the time to respond to the applied load … See more The empirical relationship of Williams-Landel-Ferry, combined with the principle of time-temperature superposition, can account for … See more The shift factor (which depends on the nature of the transition) can be defined, below Tg, using an Arrhenius law: where Ea is the … See more Consider the relaxation modulus E at two temperatures T and T0 such that T > T0. At constant strain, the stress relaxes faster at the higher temperature. The principle of time … See more For a polymer in solution or "molten" state the following relationship can be used to determine the shift factor: See more The principle of time-temperature superposition requires the assumption of thermorheologically simple behavior (all curves have the same characteristic time variation law with … See more For the superposition principle to apply, the sample must be homogeneous, isotropic and amorphous. The material must be linear viscoelastic under the deformations of … See more WebJan 1, 2024 · The time–temperature superposition principle (TTSP) is referred to by different names including frequency–temperature superposition, time–temperature analogy, method of reduced variables, ... In WLF equation, the standard temperature was considered as T s = ...
Time–temperature superposition - Wikiwand
WebBy using laws as Williams-Landel-Ferry (WLF) law [51] or Arrhenius law [45], in a Time-Temperature Superposition (TTS) model, DMA measurements are used in order to obtain … WebThe results show that when nanofluids are used, the coefficient of heat transfer and Nusselt number increased at all volume fractions and Reynolds number for both the expansion ratios. The ... html select one menu
Time–Temperature Superposition Principle and its Application to ...
WebSep 1, 2024 · The time-temperature-superposition (TTS) principle may be a powerful tool to strongly reduce the number of required tests. ... Time temperature superposition principle: application of WLF equation in polymer analysis and composites. Zastita Materijala, 55 (2014) UDC:629.179.13:678.06. WebMay 24, 2024 · It is easy to explore how Time-Temperature Superposition (TTS) works using MCalibration. First select a material model that supports the WLF equation. In the … WebThe good news is that there is a (relatively) simple equation to convert temperature into time. It was developed by Williams, Landel and Ferry and is called WLF. It says: Log(at) = − … hodge logistics