Defining contact parameters (MSC Nastran)

In the MSC Nastran environment, you use different modeling objects to specify different options for contact and glue analyses. You can specify these modeling objects:

• When you create the solution in which contact occurs.

• When you create the General Contact/Glue simulation object.

• When you define a Region that specifies the contacting or glued faces or bodies.

Defining contact options for the solution

When you create a solution, use the Global Contact Parameters option on the Case Control page of the Solution dialog box to create a modeling object to specify contact options. For example, you can control:

• The Contact Threshold value, which is the distance below which MSC Nastran considers a node to be touching a body.

• The Separation Type option, which controls whether MSC Nastran bases the separation on stresses or forces.

• The Contact Method to use, such as Regular 3D Contact.

The options in the Global Geometric Contact Parameters dialog box correspond to the fields on the BCPARA bulk data entry.

Defining options for the contacting geometry

When you create a General Contact/Glue simulation object, you can define Geometric Contact Parameters and Physical Contact Parameters modeling objects. You use these modeling objects together to specify options that apply to the touching and touched bodies in contact.

• Use the Geometric Contact Parameters modeling object dialog box to specify options that the software uses to determine whether contact occurs between bodies during the analysis. For example, you can specify:The Interference Closure Amount, which allows you to specify either the amount of overlap or size of the gap between the contacting bodies.The Contact Searching Order, which specifies how the software searches for the bodies in contact.The options in the Local Geometric Contact Parameters dialog box correspond to the fields on the BCONPRG bulk data entry.

• Use the Physical Contact Parameters modeling object to specify additional options for the bodies in contact. For example, you can specify:Options for controlling glued contact, such as Breaking Glue Maximum Tangential Stress.The Friction Coefficient, which lets you specify the coefficient of friction to use. The options in the Physical Contact Parameters dialog box correspond to the fields on the BCONPRP bulk data entry.

Defining contact options for the region

In the Region dialog box, use the Contact Body Parameters option to specify a Contact Body Parameters modeling object. Use the options in the Contact Body Parameters dialog box to define options for structural and thermal contact, such as Smoothing Control and the Environment Heat Transfer coefficient.

The options in the Contact Body Parameters dialog box correspond to the fields on the BCBDPRP bulk data entry.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the displayed part and work partMSC Nastran as the specified solverStructural as the analysis typeSolution 101 Linear Statics-Global Constraints, Solution 101 Linear Statics-Subcase Constraints, or Solution 103 Real Eigenvalues as the solution type
Command Finder	Modeling Objects

Learn more

Contact and glue conditions for MSC Nastran

Automatic face pairing

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Pre/Post video examples

Bulk Entry Descriptions

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Defining contact parameters (MSC Nastran), Simcenter 3D 2021.1 Series

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