Itasca is pleased to provide a collection of selected User Defined constitutive Models (UDM) for Itasca software (FLAC, FLAC3D, UDEC, 3DEC, and PFC). The usage of the UDMs available at this site is free of charge. However, the C++ UDM option for the corresponding Itasca software product, available for purchase, is required.

Itasca clients interested in contributing their own UDMs are invited to submit them.

Please note that the UDMs are provided for your convenience, as is, and Itasca takes no responsibility for the correctness or your usage of the UDMs.

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3DEC FLAC2D FLAC3D PFC

Backfill Concrete Low-Plasticity Silt and Clay Rock Sand Soil

Model Name	Version	Category	Software
Bond Damage Contact Model for Soft Rocks	1.0	Rock	PFC
Coupled Elastic-Softening Joint Model	1	Concrete	3DEC
UBCHYST	2002	Sand	FLAC2D
PM4Silt	2.1	Low-Plasticity Silt and Clay	FLAC2D
PM4Sand	3.3	Sand	FLAC2D
Dafalais-Manzari	4.0	Sand	FLAC3D
Fracture Energy Softening Model v7	1	Concrete	3DEC
Edinburgh-Elasto-Plastic-Adhesive (EEPA) contact model	1	Soil	PFC
HZCrush contact model	1	Sand	PFC
Johnson-Kendall-Roberts (JKR) Contact Model	1	Soil	PFC
Fracture Energy Softening Model	1	Concrete	3DEC
Hill Contact Model	4	Backfill	PFC
Beam Contact Model	1	Backfill	PFC
Wang2D	1	Sand	FLAC2D