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B1540
Topic: Contributions on control and reliability Title: Reliability of materials through the TTS R library Authors:  Antonio Meneses - Universidad de Chimborazo (Ecuador)
Javier Tarrio-Saavedra - Universidade da Coruna (Spain)
Salvador Naya - University of A Coruna (Spain) [presenting]
Abstract: The TTS R library has been developed to estimate the behavior of materials under thermal and mechanical loads. It provides the prediction of viscoelastic properties such as modulus at short and long observation times through time temperature superposition (TTS) principle. TTS is used to estimate mechanical properties of linear viscoelastic materials from known properties at a reference temperature. The hypothesis that all curves present the same characteristic time variation and shape with temperature is assumed. Previous models are implemented to modulus curves obtained at different temperatures to estimate the shift factors. The master curve is obtained from shift factors and it provides viscoelastic properties estimates at times different from the experimental. In addition, a newer method for obtaining the shift factors based on the study of the derivatives of viscoelastic properties is presented and implemented in the TTS package. The resulting shift factors provide smooth master curves applying Bsplines.