Meneses Freire, AntonioNaya, SalvadorFrancisco-Fernández, MarioLópez-Beceiro, JorgeGracia-Fernández, CarlosTarrío-Saavedra, Javier2023-11-272023-11-272023Meneses, A. et al. (2023) ‘TTS package: Computational tools for the application of the time temperature superposition principle’, Heliyon, 9(5). doi:10.1016/j.heliyon.2023.e15816.2405-8440http://hdl.handle.net/2183/34346[Abstract]: The TTS package has been developed in R software to predict the mechanical properties of viscoelastic materials, at short and long observation times/frequencies by applying the Time Temperature Superposition (TTS) principle. TTS is a physical principle used in material science to estimate mechanical properties beyond the experimental range of observed times/frequencies by shifting data curves obtained at other temperatures relative to a reference temperature in the dataset. It is a methodology related to accelerated life-tests and reliability, whereas the TTS library is one of the first open source computational tool to apply the TTS principle. This R package provides free computational tools to obtain master curves that characterize materials from a thermal-mechanical approach. The TTS package also proposes, implements and explains our own method to obtain the shift factors and the master curve in a TTS analysis, based on horizontal shifting of the first derivative function of viscoelastic properties. This procedure provides shift factors estimates and smooth master curve estimates using B-spline fitting, in a fully automatic way, without assuming any parametric expression. Williams-Landel-Ferry (WLF) and Arrhenius TTS parametric models are also implemented in the TTS package. They can be fitted from shifts obtained by the our first derivative based method.engAtribución-NoComercial-SinDerivadas 3.0 Españahttps://creativecommons.org/licenses/by-nc-nd/4.0/http://creativecommons.org/licenses/by-nc-nd/3.0/es/Time Temperature SuperpositionThermal analysisStatistical modelingR softwarejournal articleopen access10.1016/j.heliyon.2023.e15816