Influence of thickness on phase shift and damping of a cement – ronier fiber Compound

In this document, four samples of composite materials of cement - fiber of the ronier are manufactured to thicknesses of 10; 12; 15 and 20 cm. They are kept in the laboratory (LEMA) for two months. They are subsequently wrapped in glass wool, instrumented and exposed for five days to solar thermal stresses. Flow and temperature data are collected and processed. Curves of external and internal temperature variations as a function of time as well as those of variations in phase shift and damping as a function of the thicknesses are plotted. The analysis of the data processing and the interpretation of the curves shows that the damping is a decreasing function of the thickness whereas the phase shift increases with the thickness of this material. However, we note an asymptotic limit to these variations, which shows that beyond a certain value of the thickness these parameters do not change any more.