MOISTURE INTRUSION IN VISCOELASTIC POROUS MEDIA: INDUCED-STRESS AND DEFORMATION

Abstract

Porous media exposed to humid air absorb moisture which can lead to extensive internal damage and failure. In this paper, we analyze numerically the influence of the moisture intrusion in a two-layer viscoelastic porous media. The relationship between air humidity and moisture content inside the porous media was examined. It was also found that the local stress increases with the exposure time to humid air but decreases with initial moisture content of the porous medium. Furthermore, the stress components were tensile at the centre of the medium and compressive near the medium surface. The ultimate strength of the medium was only exceeded for the stresses in axial and tangential directions.

Keywords

Dates

  • Submission Date2007-11-27
  • Revision Date2008-07-15
  • Acceptance Date2008-12-08

DOI Reference

10.2298/TSCI0901047M

References

  1. Nield, D. A., Bejan, A., Convection in Porous Media, 2nd ed., Springer, New York, USA, 1999
  2. Bejan, A., et al., Porous and Complex Flow Structure in Modern Technology, Springer, New York, USA, 2004
  3. Miguel, A. F., Contribution to the Characterisation of Porous Media, Int. J. Heat and Mass Transfer, 43 (2000), 13, pp. 2267-2272
  4. Miguel, A. F., Serrenho, A., On the Experimental Evaluation of Permeability in Porous Media Using a Gas Flow Method, Journal of Physics D, 40 (2007), 21, pp. 6824-6828
  5. Hearn, E. J., Mechanics of Materials 2, Butterworth Heinemann, Oxford, UK, 1997
  6. Augier, F., et al., On the Risk of Cracking in Clay Drying, Chemical Engineering Journal, 86 (2002), 1-2, pp. 133-138
  7. Muralidharan, V., et al., A Flow Through Porous Media Model for Pore Pressure During Heating of Polymer-Matrix Composites, Composites Science and Technology, 66 (2006), 10, pp. 1409-1417
  8. van der Kooi, J., Moisture Transport in Cellular Concrete Roofs, Ph. D. thesis, Eindhoven Technische Hogeschool, Eindhoven, The Netherlands, 1971
  9. Miguel, A. F., Transport Phenomena through Porous Screens and Openings, Ph. D. thesis, Wageningen University and IMAG, Wageningen, The Netherlands, 1998
  10. Wang, B., Yu, W., A Method for Evaluation of Heat and Mass Transport Properties of Moist Porous Media, Int. J. Heat and Mass Transfer, 31 (1998), 5, pp. 1005-1009
  11. Christensen, R. M., Theory of Viscoelasticity: An introduction, Academic Press, New York, USA, 1982
  12. Bear, J.: Dynamics of Fluids in Porous Media, Dover Publications Inc., New York, USA, 1988
  13. Oore, M., Assessment of Influence Function for Elliptical Cracks Subjected to Uniform Tension, ASTM Fracture Mechanics, No. 1074, 1990, pp. 490-508
  14. Loggia, D., et al., Phase Diagram of Stable Miscible Displacements in Layered Porous Media, Europhysics Letters, 36 (1996), 2, pp. 105-110
  15. Roache, P. J.: Verification and Validation in Computational Science and Engineering, Hermosa Publishers, Albuquerque, N. Mex., USA, 1998
  16. Silva, A., Coelho, P. J., Numerical Investigation of Natural Convection in a Rectangular Cavity with an Internal Partition, Proceedings, 7th International Conference on Computational Methods and Experimental Measurements, Capri, Italy, Computational Mechanics Publications (Ed. G. Carlomagno), 1995, pp. 18-25
  17. Miguel, A. F., Silva, A., Particle Deposition onto a Flat Plate with Various Slopes, Journal of Aerosol Science, 34 (2003), supplement 1, pp. 667-668
  18. Breuer, J. J., Moisture and Stress Analysis of Low Porosity Media, Report No. P097-XIX, IMAG, Wageningen, The Netherlands, 1997, p. 58
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