Specifying the contact direction and gap clearance for the rigid-flexible contact (Simcenter Samcef)

Simcenter Samcef Rigid-Flexible contact defines a contact between a flexible (deformable) object and a rigid surface.

The Contact Sense option of the contact definition, combined with the Compression Length (or Traction Length) drives the contact behavior.

Rigid surface orientation and flexible body relative movement

The option that you select in the Contact Sense list controls the relative movement between the flexible body and the rigid surface during the contact.

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	When you define a contact between a flexible body (1) and a rigid surface (2), from the Contact Sense list, select Compression to specify that the flexible body moves against (3) the rigid surface normal.The flexible body is free to move in the initial gap (4) between the two parts before a contact occurs with the rigid surface (5).

Compression Length (Compression case)

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	The Compression Length drives the gap value separating the flexible body (1) and the rigid surface (2) before the contact.
	By default, without specifying a Compression Length, the flexible body freely moves in the initial gap area (1) between the two parts. Contact with the rigid surface (2) appears when this gap is cleared.
	If you want to clear the initial gap before the contact process, enter a positive Compression Length (1) value equal to the gap size. The rigid surface moves along its normal direction accordingly and clears the gap area (2).
	If you want to increase the initial gap, enter a negative Compression Length. The rigid surface moves against its normal direction away from the flexible body, adding an extra gap (1) to the original one (2).
	If both parts are already in contact in the model, accept the default 0 Compression Length.Caution: Using a 0 value in the Compression Length when an initial gap exists in the model does not clear this gap size.

The same rules apply to the Compression option of the Contact Sense list (and its Traction Length-related value). For more information, see the LT parameter of the Samcef .MDS command.

For more information on the rigid surface definition, see Rigid Surface Definition dialog box (Simcenter Samcef).

Default values for Compression Length and Traction Length may vary according to the rigid surface type. For more information, see the rigid surface definition page in the Simcenter Samcef solver documentation.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Samcef as the specified solver
Command Finder	Rigid-Flexible Contact
Simulation Navigator	Right-click Simulation Objects→New Simulation Object→Rigid-Flexible Contact

How do I

Define a surface for the Rigid-Flexible Simcenter Samcef contact

Learn more

Rigid Analytical Surface Contact (Simcenter Samcef)

Look up more details

Rigid Surface Definition dialog box (Simcenter Samcef)

Rigid Analytical Surface Contact dialog box (Simcenter Samcef)

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Specifying the contact direction and gap clearance for the rigid-flexible contact (Simcenter Samcef), Simcenter 3D 2021.1 Series

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