This page gives an overview of Material property changes between PLAXIS CONNECT Edition V21.01 to PLAXIS 2024.2.

For all the changes between versions check the full overview in the PDF attached in Downloads section.

The Material object data structure has been updated to be more flexible for future developments.
Also, the naming convention has been made more consistent: any property name now follows CamelCase formatting, except where the first "word" and its casing represents a geotechnical meaning. Examples:

• Soil model will be written as .SoilModel
• initial void ratio e_init will be written as .eInit
• Mohr-Coulomb's stiffness E^ref will be written as .ERef
• Hardening Soil's oedometer stiffness E_oed^ref will be written as .EOedRef
• Hardening Soil's stress dependency power m will be written as .PowerM</span

This page will highlight in green the changes to the most used parameters. For a full list of current .Property names, please check the Objects reference (available via the PLAXIS Help menu) or use the echo command targeting the material object.

Latest changes

With the release of PLAXIS 2024.2 the following items have changes:

• Cables

Last update: Oct 29, 2024

Quick list

• Soil - General
• Soil - Groundwater
• Soil - Interface
• Soil - Initial stresses
• Soil - Mohr-Coulomb
• Soil - Hardening Soil/HS Small
• Soil - Soft Soil/Soft Soil Creep
• Soil - NGI-ADP
• Rock - Hoek-Brown
• User Defined Soil Model
• Plates (2D)
• Plates (3D)
• Geogrids
• Beams (3D)
• Embedded beams
• Cables
• Anchors

Soil - General

V21.01	2024.2	Comment
.MaterialName	.Identification
.ninit	.nInit
.einit	.eInit

Soil - Groundwater

V21.01	2024.2	Comment
.perm_primary_horizontal_axis	.PermHorizontalPrimary
.perm_vertical_axis	.PermVertical

Soil - Interface

V21.01	2024.2	Comment
.InterfaceStrength	.InterfaceStrengthDetermination	This was an implicit setting. It was made explicit in V22.00.
.Rinter	.Rinter	It is required to first set .InterfaceStrengthDetermination to "Manual" or "Manual with residual strength"
.ConsiderGapClosure	.GapClosure
.InterfaceStiffness	.InterfaceStiffnessDetermination	Naming of options has been changed in V22.00
.InterfaceKn	.knInter	When Interface stiffness is set to Direct
.InterfaceKs	.ksInter	When Interface stiffness is set to Direct
.EoedRef	.EoedInter	Used for UDSM and Modified Cam-Clay
.cref	.CInter	Used for UDSM and Modified Cam-Clay
.phi	.PhiInter	Used for UDSM and Modified Cam-Clay
.psi	.PsiInter	Used for UDSM and Modified Cam-Clay

Soil - Initial stresses

V21.01	2024.2	Comment
-	.K0Determination	This was an implicit setting. It was made explicit in V22.00.
.K0Primary	.K0Primary	It is required to first set .K0Determination to "Manual"
.K0Secondary	.K0Secondary	It is required to first set .K0Determination to "Manual"
.K0PrimaryIsK0Secondary	.K0PrimaryIsK0Secondary	It is required to first set .K0Determination to "Manual"

Soil - Mohr-Coulomb

V21.01	2024.2	Comment
.ERef	.Eref
.Gref	.GRef
.Eoed	.EOed
.cref	.cRef
.Einc	.EInc
.verticalref	.VerticalRef	Following the CamelCase formatting
-	.EInc	New since V22.00: in favor of Ginc
.Ginc	x	Direct input of Einc in stead of Ginc
.cinc	.cInc

Soil - Hardening Soil/HS Small

V21.01	2024.2	Comment
.Gref	x	Deprecated. Instead use .EURRef
.E50ref	.E50Ref
.EoedRef	.EOedRef
.EurRef	.EURRef
.powerm	.PowerM
.Pref	.pRef
.Rf	.RF
.nu	.nuUR
.K0nc	.K0NC
.cref	.cRef
.verticalref	.VerticalRef	Following the CamelCase formatting
.cinc	.cInc
.G0ref	.G0Ref	* only for HS small
.Cc	.CC	Alternative parameters for stiffness
.Cs	.CS	Alternative parameters for stiffness

Soil - Soft Soil/Soft Soil Creep

V21.01	2024.2	Comment
.MuModified	.muModified
.Cc	.CC	Alternative parameters for stiffness
.Cs	.CS	Alternative parameters for stiffness
.Ca	.CAlpha	Alternative parameters for stiffness
.nu	.nuUR
.cref	.cRef
.K0nc	.K0NC

Soil - NGI-ADP

V21.01	2024.2	Comment
.UnloadingShearStiffness	.GURsUARatio
.nu	.nuU
.ReferenceShearStrength	.sUARef
.IncreaseOfShearStrengthWithVerticalRef	.sUAInc
.RelativeTriaxialCompressiveShearStrength	.sUCTxsUARatio
.RelativePassiveStrength	.sUPsUARatio
.RelativeDirectShearStrength	.sUDSSsUARatio
.AxialFailureStrainTriaxialCompression	.gammaFC
.AxialFailureStrainTriaxialExtension	.gammaFE
.ShearFailureStrainDirectSimpleShear	.gammaFDSS
.InitialMobilization	.tau0sUARatio
.verticalinc	.VerticalInclination

Rock - Hoek-Brown

V21.01	2024.2	Comment
.Eref	.Erm
.Gref	.GRef	New in V22.00: alternative input to Young's modulus
.UnconfinedCompressiveStrength	.AbsSigmaCI
.HoekBrownParameter	.mi
.GeologicalStrengthIndex	.GSI
.DisturbanceFactor	.Disturbance
.mb	.mb	Hoek-Brown mb
.s	.s	Hoek-Brown s
.a	.alpha	Hoek-Brown a
.sigt	.SigmaT	Rock mass parameter
.sigc	.SigmaC	Rock mass parameter
.MaximumDilitationAngle	.psiMax
.MinorPrincipalStress	.sigmaPsi

User Defined Soil Model

V21.01	2024.2	Comment
.UserDLLName	.DllFile	New in V22.00: property is enumeration. Use string representation when setting the value
.UserModel	.ModelInDll	New in V22.00: property is enumeration. Use string representation when setting the value

Plates (2D)

V21.01	2024.2	Comment
.MaterialName	.Identification
.Elasticity	.MaterialType	Material Type needs to be set explicitly
.IsIsotropic	.Isotropic
.EA	.EA1
.nu	.StructNu
.d	.d	Thinkness of the plate
.Np	.Np1
.Mp	.MP
.Gref	x	Deprecated. Instead use .EA1
.ElastoplasticMKTable	.MkappaDiagram	* only used when .MaterialType is set to Elastoplastic (M-kappa)

Plates (3D)

V21.01	2024.2	Comment
.MaterialName	.Identification
.Elasticity	.MaterialType	Material Type needs to be set explicitly
.w	.Gamma
.IsIsotropic	.Isotropic
.d	.d	Thinkness of the plate
.Nu12	.StructNu12
.sigy11	.YieldStress11	* only used when .MaterialType is set to Elastoplastic
.sigy22	.YieldStress22	* only used when .MaterialType is set to Elastoplastic
.W11	.W11	* only used when .MaterialType is set to Elastoplastic
.W22	.W22	* only used when .MaterialType is set to Elastoplastic

Geogrids

V21.01	2024.2	Comment
.MaterialName	.Identification
.Elasticity	.MaterialType	Material Type needs to be set explicitly
.IsIsotropic	.Isotropic
.N1Eps1Table	.N1eps1	* only used when .MaterialType is set to Elastoplastic (N-eps)
.N2Eps2Table	.N2eps2	* only used when .MaterialType is set to Elastoplastic (N-eps) and anisotropic

Beams (3D)

V21.01	2024.2	Comment
.MaterialName	.Identification
.Elasticity	.MaterialType	Material Type needs to be set explicitly
.w	.Gamma
.BeamType	.CrossSectionType
.PredefinedBeamType	.PredefinedCrossSectionType
.Iyy	.I3
.Izz	.I2
.sigy	.YieldStress	* only used when .MaterialType is set to Elastoplastic

Embedded beams

V21.01	2024.2	Comment
embeddedbeamrow()	embeddedbeam()	Removed the word row from the command. PLAXIS 2D only
.MaterialName	.Identification
.Elasticity	.MaterialType	Material Type needs to be set explicitly
.Lspacing	.LSpacing	PLAXIS 2D only
.BeamType	.CrossSectionType
.PredefinedBeamType	.PredefinedCrossSectionType
.w	.Gamma
.Iyy	.I	PLAXIS 2D only
.Iyy	.I3	PLAXIS 3D only
.Izz	.I2	PLAXIS 3D only
.SkinResistance	.AxialSkinResistance
.Tstart	.TSkinStartMax
.Tend	.TSkinEndMax
.SkinResistanceTable	.MultiLinearAxialSkinResistance	* only used when .AxialSkinResistance is set to Mulit-linear
.Tmax	.TMax	* only used when .AxialSkinResistance is set to Layer dependent
.TLateralStart	.TLatStartMax
.TLateralEnd	.TLatEndMax
.Fmax	.FMax
.DefaultStiffnessFactors	.DefaultValues	PLAXIS 2D only
.AxialSkinStiffnessFactor	.AxialStiffnessFactor	PLAXIS 2D only
.LateralSkinStiffnessFactor	.LateralStiffnessFactor	PLAXIS 2D only
.PileBaseStiffnessFactor	.BaseStiffnessFactor	PLAXIS 2D only

Cables

V21.01	2024.2	Comment
-	.NpTens	Following the CamelCase formatting
-	.NpComp	Following the CamelCase formatting
-	cable()	Removed the word bolt from the command. PLAXIS 2D only
-	cablemat()	Removed the word bolt from the command. PLAXIS 2D only

Anchors

V21.01	2024.2	Comment
.MaterialName	.Identification
.Elasticity	.MaterialType	Material Type needs to be set explicitly
.Lspacing	.LSpacing	* only for PLAXIS 2D
.FMaxTens	.FMaxTens	* only used when .MaterialType is set to Elastoplastic
.FMaxComp	.FMaxComp	* only used when .MaterialType is set to Elastoplastic
.FResidualTens	.FResTens	* only used when .MaterialType is set to Elastoplastic with residual strength
.FResidualComp	.FResComp	* only used when .MaterialType is set to Elastoplastic with residual strength
.FMaxTensPerLength	x	Removed in favor of .FMaxTens. PLAXIS 2D only
.FMaxCompPerLength	x	Removed in favor of .FMaxTens. PLAXIS 2D only

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