Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
NUMERIC-EXPERIMENTAL STUDY OF THERMOPLASTICS SUBJECT TO DIFFERENT WATER ABSORPTION RATIOS, DIFFERENT TEMPERATURES AND ITS EFFECTS ON VISCOELASTIC BEHAVIOR
Submission Author:
Mateus Pescador , RS
Co-Authors:
Mateus Pescador, Lucas Casagranda, Jakson Vassoler
Presenter: Mateus Pescador
doi://10.26678/ABCM.COBEM2021.COB2021-1098
Abstract
Polymers are being used in many structural applications, and therefore, it is important to understand the effects of environmental factors, such as water and temperature. Offshore applications, like bend stiffeners, can be subject to non-standard environmental conditions, bringing more difficulties to the analysis. Due to the complex mechanical behavior of these materials, it is necessary to use appropriate numerical models that can reproduce these inelastic effects. Water absorption and temperature can play an essential role in the mechanical response of thermoplastics. In this work, a thermoplastic polymer is subject to different water absorption ratios and temperatures, and a numerical-experimental characterization of their viscoelastic behavior is presented. The material was characterized experimentally through dynamic-mechanical analysis for three different water absorption ratios (dry, saturated, and an intermediary condition of water absorption) and two different temperatures. Different material models are studied, including classic viscoelastic models. In these material models, a superposition principle is used considering temperature and water absorption analogously to the time-temperature shift factor. With this approach, it is possible to obtain a good representation of thermoplastic mechanical behavior considering different water absorption ratios and different temperatures.
Keywords
viscoelasticity, dynamic mechanical analysis, Thermoplastics, water absorption
