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Stochastic Modeling of Cracked Solids and the Related Size Effects

[+] Author Affiliations
Jianxu Shi, Roger G. Ghanem

Johns Hopkins University, Baltimore, MD

Paper No. OMAE2002-28070, pp. 23-30; 8 pages
doi:10.1115/OMAE2002-28070
From:
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3613-4 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME

abstract

This paper examines the crack size effect of homogenization and microstructure on the materials. It is proposed that the size of the microstructure should not only affect the mean response of the material, which would correspond to the conventional deterministic concept of material size effect, but should also affect its whole probabilistic structure. As an example, a non-stationary stochastic tensor field is characterized as an equivalent continuum model of a solid medium with a random distribution of micro-cracks. The crack size dependence of the variance and covariance functions of the tensor field is verified and fitted to a proposed functional form. Once the correlation structure is determined, the corresponding stochastic field can be synthesized and standard computational algorithms can then be used to predict the behavior of the material.

Copyright © 2002 by ASME

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