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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.19 [2012] >
IJEMS Vol.19(4) [August 2012] >
| Title: | Simulation of non-linear viscoelastic behavior of cross-linked mesoporous silica aerogels by depth-sensing indentation |
| Authors: | Kucuk, Yilmaz |
| Keywords: | Depth-sensing indentation
Mesoporous structure
Cross-linked aerogel
FEM modelling |
| Issue Date: | Aug-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Aerogels are ultra-lightweight nanoporous materials with high thermal insulation value for industrial applications. Recently, a reinforcing process referred to as ‘crosslinking’ has been implemented to improve their mechanical properties via coating the pore structure with a nano-thin conformal polymer layer. In this study, ordered mesoporous, monolithic silica aerogels obtained by templating with a tri-block co-polymer used as surfactant, is tested by depth-sensing indentation at the room temperature, and the results are compared with simulations using the ABAQUS software package. Assuming that polymer crosslinked aerogels have non-linear viscoelastic properties due to their polymer encapsulated mesoporous structure, the Burgers model is implemented as a user-defined subroutine in the ABAQUS environment. The results clearly show that the loading-unloading curves obtained from the nanoindentation tests are in good agreements with simulation. Therefore, predictions using different loads and loading rates can be modeled by implementing Burger's model. |
| Page(s): | 260-268 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.19(4) [August 2012]
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