The mathematical equivalence between the cap model in general and the constant pseudo-complementary energy surface defined by the stress deviation from a certain hydrostatic stress state is shown. This hydrostatic stress is proportional to the so-called "hardening parameter" in other literature. Consequently, the determination of a material parameter (the aspect ratio of the elliptical cap) is reduced to the measurement of the unloading elastic constants. Based on this analysis, a simple experimental approach to determine the parameters required for the cap model to represent polyaxial behavior of soils and rocks is presented. /Authors/

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  • Accession Number: 00194170
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14384
  • Files: TRIS
  • Created Date: Aug 15 1979 12:00AM