Contact Parameters – Advanced Nonlinear Pair dialog box

Option	Description
Name	Defines the modeling object name.
Label	Specifies a unique numerical identifier for the modeling object.
Description	Enter a brief description or click to open a text editor where you can enter a longer description.

SOL 601 options

General
Contact Algorithm	TYPE field in the BCTPARA bulk data entry.Specifies the type of contact algorithm to use.Note: The Rigid Target option is not applicable for 2D contact analyses.
Contact Surfaces	NSIDE field in the BCTPARA bulk data entry.Indicates whether the contact surfaces are single- or double-sided.Note: This option is not applicable for 2D contact analyses.
Birth Time	TBIRTH field in the BCTPARA bulk data entry.Indicates the birth time for the contact set.
Death Time	TDEATH field in the BCTPARA bulk data entry.Indicates the death time for the contact set.
Initial Penetrations	INIPENE field in the BCTPARA bulk data entry.Controls how initial penetrations or gaps are handled during the analysis.Eliminated: Eliminates initial penetrations.Eliminated/Print Penetrating Nodes Ignores initial penetrations. In subsequent steps, each source node is allowed to penetrate the target surface up to its initial penetration.Overridden: Initial penetrations or gaps are overwritten by the specified Constant Gap Distance value.
Constant Gap Distance	Available if Initial Penetrations is set to Overridden.GAPVAL field in the BCTPARA bulk data entry.Specifies a constant gap distance between the source region and the target region. If you specify a negative value, Simcenter Nastran eliminates any initial penetrations.
Penetration Depth	PDEPTH field in the BCTPARA bulk data entry.Specifies the penetration depth for single-sided contact.If Penetration Depth >0.0, then penetration is detected.If Penetration Depth ≤0.0, then penetration is deemed not to occur.
Continuous Segment Normal	SEGNORM field in the BCTPARA bulk data entry.Indicates whether a continuous (interpolated) contact segment normal is used for the contact surfaces.
Type of Offset	OFFTYPE field in the BCTPARA bulk data entry.Specifies the type of offset used for contact regions.Note: This option is not applicable for 2D contact analyses.Use Value for Single-Sided Contact: Uses the value specified in the Default Offset field for single-sided contact. Uses an offset value of 0.001 for double-sided contact.Use Value for Single/Double-Sided Contact Uses the value specified in the Default Offset field for both single- and double-sided contact.Half the Shell Thickness: Uses the value of half o f the shell thickness for contact regions on 2D elements. No offset is used otherwise.
Default Offset	OFFSET field in the BCTPARA bulk data entry.Defines the default offset distance for contact regions.
Standard Contact Algorithm
Displacement Formulation	DISP field in the BCTPARA bulk data entry.Specifies the displacement formulation used for this contact set.Default: Uses the formulation specified in the Default Displacement Formulation list on the Contact tab in the Strategy Parameters modeling object dialog box.Small Displacement: Uses the small displacement formulation in which contact conditions are not updated.Large Displacement: Uses the large displacement formulation in which contact conditions are updated.
Time to Eliminate Initial Penetrations	TZPENE field in the BCTPARA bulk data entry.Specifies the time to eliminate initial penetrations.If Time to Eliminate Initial Penetrations=0.0 and Initial Penetrations is set to Eliminated or Eliminated/Print Penetrating Nodes, then the initial penetrations are eliminated in the first time step. This may cause convergence difficulties for some analyses.If Time to Eliminate Initial Penetrations>0.0, then the initial penetrations are eliminated gradually over the time value you specify.
Consistent Contact Stiffness	CSTIFF field in the BCTPARA bulk data entry.Indicates whether consistent contact stiffness is used for the analysis.
Contact Regions in Each Pair	TIED field in the BCTPARA bulk data entry.Indicates whether contact regions in each contact pair are tied together. If you select Tied, then the software assumes small rotations of the contact regions.
Contactor Node Tolerance	Appears if you choose Tied from the Contact Regions in Each Pair list.TIEDTOL field in the BCTPARA bulk data entry.Specifies the tolerance used to determine whether the nodes on the source surface are tied to the target region when Contact Regions in Each Pair is set to Tied. A contactor node is considered to be tied to the target region if the distance between them is less than this value.
Extension Factor	EXTFAC field in the BCTPARA bulk data entry.Specifies the factor for extending contact surfaces beyond their boundaries. The amount of extension is equal to the specified Extension Factor value multiplied by the length of the contact segments.
Friction Model Type	FRICMOD field in the BCTPARA bulk data entry.Enter an integer between 0 and 13 that corresponds to the type of friction model to use. See the Simcenter Nastran Advanced Nonlinear Theory and Modeling Guide for descriptions of the different friction models.
Delay Friction	FRICDLY field in the BCTPARA bulk data entry.Indicates whether the application of friction is delayed (whether friction is applied on a node in the time step after the node comes into contact). Delaying the application of friction may improve the convergence of the solution.
Friction Parameter A1	FRPARA1 field in the BCTPARA bulk data entry.
Friction Parameter A2	FPARA21 field in the BCTPARA bulk data entry.
Friction Parameter A3	FPARA3 field in the BCTPARA bulk data entry.
Friction Parameter A4	FPARA4 field in the BCTPARA bulk data entry.
Friction Parameter A5	FPARA5 field in the BCTPARA bulk data entry.
Constraint Function Contact Algorithm
Parameter for Normal Constraint Function	EPSN field in the BCTPARA bulk data entry.Specifies the parameter for normal constraint function.
Parameter for Frictional Constraint Function	EPST field in the BCTPARA bulk data entry.Specifies the parameter for frictional constraint function.
Compliance Factor	CFACTOR1 field in the BCTPARA bulk data entry.Specifies the compliance factor.
Standard Contact Algorithm
Contact Heat Transfer Coefficient	TMCHHAT field in the BCTPARA bulk data entry.Specifies the contact heat transfer coefficient used for calculating the amount of heat transfer between bodies in contact.
Proportion of Heat Going to the Contactor Body	TMCFC field in the BCTPARA bulk data entry.Specifies the coefficient that defines the proportion of heat generated due to frictional contact going to the source body.
Proportion of Heat Going to the Target Body	TMCFT field in the BCTPARA bulk data entry.Specifies the coefficient that defines the proportion of heat generated due to frictional contact going to the target body.

SOL 701 options

General
Contact Algorithm	XTYPE field in the BCTPARA bulk data entry.Specifies the type of contact algorithm to use.
Contact Surfaces	NSIDE field in the BCTPARA bulk data entry.Indicates whether the contact surfaces are single- or double-sided.
Penetration Depth	Available if you select Single-Sided from the Contact Surfaces list.PDEPTH field in the BCTPARA bulk data entry.
Birth Time	TBIRTH field in the BCTPARA bulk data entry.
Death Time	TDEATH field in the BCTPARA bulk data entry.
Type of Offset	OFFTYPE field in the BCTPARA bulk data entry.
Initial Penetrations	INIPENE field in the BCTPARA bulk data entry.Controls how initial penetrations or gaps are handled during the analysis.Eliminated: Eliminates initial penetrations.Eliminated/Print Penetrating Nodes Ignores initial penetrations and the list of penetrating nodes is printed..Ignored: Initial penetrations or gaps are ignored. In subsequent steps, each source node is allowed to penetrate the target surface up to its initial penetration.
Default Offset	OFFSET field in the BCTPARA bulk data entry.Defines the default offset distance for contact regions.
Time to Eliminate Initial Penetrations	TZPENE field in the BCTPARA bulk data entry.Specifies the time to eliminate initial penetrations.If Time to Eliminate Initial Penetrations=0.0 and Initial Penetrations is set to Eliminated or Eliminated/Print Penetrating Nodes, then the initial penetrations are eliminated in the first time step. This may cause convergence difficulties for some analyses.If Time to Eliminate Initial Penetrations>0.0, then the initial penetrations are eliminated gradually over the time value you specify.
Extension Factor	EXTFAC field in the BCTPARA bulk data entry.Specifies the factor for extending contact surfaces beyond their boundaries. The amount of extension is equal to the specified Extension Factor value multiplied by the length of the contact segments.
Penalty algorithm options
Normal Penalty Stiffness Criterion	Available if you select Penalty from the Contact Algorithm list.XKNCRIT in the BCTPARA bulk data entry.Specifies the criterion used for the evaluation of the normal penalty stiffness.
Normal Penalty Stiffness	Available if you select User Specified from the Normal Penalty Stiffness Criterion list.XKN in the BCTPARA bulk data entry.Specifies the normal penalty stiffness value to use.
Tangential Penalty Stiffness Criterion	Available if you select Penalty from the Contact Algorithm list.XKTCRIT in the BCTPARA bulk data entry.Specifies the criterion used for the evaluation of tangential penalty stiffness.
Tangential Penalty Stiffness	Available if you select User Specified from the Tangential Penalty Stiffness Criterion list.XKT in the BCTPARA bulk data entry.Specifies the tangential penalty stiffness value to use.
Damping	Available if you select Penalty from the Contact Algorithm list.XDAMP in the BCTPARA bulk data entry.Indicates whether damping is used.
Damping Coefficient	Available if you select either Critical Damping or Damping Coefficient from the Damping list.XNDAMP in the BCTPARA bulk data entry.Specifies the relative or absolute damping coefficient (for normal penalty stiffness).
Rigid Target algorithm options
Maximum Sliding Velocity	Available if you select Rigid Target from the Contact Algorithm list.SLIDVEL in the BCTPARA bulk data entry.Specifies the maximum sliding velocity to use to model sticking friction.When the velocity is smaller than the Maximum Sliding Velocity value you specify, then sticking is assumed.When the velocity is larger than the Maximum Sliding Velocity value you specify, then sticking is not assumed.
Gap Bias	Available if you select Rigid Target from the Contact Algorithm list.GAPBIAS in the BCTPARA bulk data entry.Defines the value that the software uses to detect contact. Contact is detected when the distance between the target and the source (accounting for any offsets) is less than the specified Gap Bias value.
Implementation of Offsets	Available if you select Rigid Target from the Contact Algorithm list.OFFDET in the BCTPARA bulk data entry.Controls how the software implements the offsets.Choosed by Program : The software selects the implementation based upon the shape of the target surfaces. If a target surface is flat or convex, then the software uses spheres. Otherwise, the software uses normals.Sphere Around Contactor Node: The software places a sphere with a radius that is equal to the specified offset value around each contactor node. Contact is detected between the spheres and the target surface.Two Surfaces Per Contactor Surface: The software constructs two surfaces for each contactor (source) surface—an upper surface and a lower surface. The software constructs these surfaces using the offsets and the averaged contactor normals. Contact is detected between points on the constructed contactor surfaces and the target surface.

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Contact Parameters – Advanced Nonlinear Pair dialog box, Simcenter 3D 2021.1 Series

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