*POROUS BULK MODULI

Define bulk moduli for soils and rocks.

This option is used to define the bulk moduli of solid grains and a permeating fluid such that their compressibility can be considered in the analysis of a porous medium. The POROUS BULK MODULI option cannot be used with the porous metal plasticity material model. For cohesive elements, this option can be used in conjunction with the ELASTIC, TYPE=TRACTION option to define Biot's coefficient.

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Porous bulk moduli

ProductsAbaqus/StandardAbaqus/CAE

TypeModel data

LevelModel

Abaqus/CAEProperty module

There are no parameters associated with this option.

 

Data lines to define bulk moduli

First line

  1. Bulk modulus of solid grains. (Units of FL−2.) If this entry is blank or zero, this value is assumed to be infinite.

  2. Bulk modulus of permeating fluid. (Units of FL−2.) If this entry is blank or zero, this value is assumed to be infinite.

  3. Temperature.

Repeat this data line as often as necessary to define the dependence of the bulk moduli on temperature.

Data line for cohesive elements

First (and only) data line

  1. Es⁢o. (Units of FL−2.)

    Biot’s coefficient then follows from the identity α0=En⁢n/Es⁢o, where En⁢n is given by the ELASTIC, TYPE=TRACTION option.