SANTOS, W. R. G.; http://lattes.cnpq.br/5731279762924017; SANTOS, Wanessa Raphaella Gomes dos.
Résumé:
Composite materials are of great importance for engineering, since they possess certain properties not obtained by their constituent materials individually. Polymeric composites reinforced by vegetable fibers, for instance, have low density, higher availability and deformability, low cost and biodegradability as advantages. However, the hydrophilic nature of vegetable fibers negatively affects the mechanical properties of these composites. Thus, it is essential to predict the dynamics of moisture absorption and heating, and their effects on the mechanical properties of these composites. The aim of
this work is to study the moisture absorption (Langmuir model) and heat transfer (Fourier
law) in polymeric composites reinforced by vegetable fibers using a three-dimensional
and transient approach. The analytical (Laplace Transform method) and numerical (Finite
Volume Method) solutions of the governing equations are presented and analyzed.
Results of concentrations of free and entrapped solute, moisture content, temperature and
average moisture content obtained within the material at different instants of the process
are presented and analyzed. It has been found that the gradients of molecule concentrations (free and entrapped) are higher on the surface of the material and how
higher the concentration of free solute, will be higher the concentration of solute
entrapped within the material at any time. In addition, it was observed that the geometric
effect and the physical parameters of the Langmuir Model directly influence the kinetics
and distribution of the mass properties.