Drucker Prager

This command is used to construct an multi dimensional material object that has a Drucker-Prager yield criterium.

nDmaterial DruckerPrager $matTag $a $b $c

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This Code has been Developed by: Peter Makenzie, U Washington and the great Pedro Arduino, U Washington

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$matTag	integer tag identifying material
$a	I don't know
$b	BUT
$c	I bet Peter and Pedro do!

The material formulations for the J2 object are "ThreeDimensional," "PlaneStrain," "Plane Stress," "AxiSymmetric," and "PlateFiber."

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THEORY:

The theory for Drucker-Prager can be found at wikipedia here

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REFERENCES;

Drucker, D. C. and Prager, W., "Soil mechanics and plastic analysis for limit design. Quarterly of Applied Mathematics, vol. 10, no. 2, pp. 157–165, 1952.