# Frequent question: What are constants in Ansys?

Contents

## What are contacts in Ansys?

In Ansys software, contact names are titled frictional, frictionless, rough, bonded and no separation.

• Bonded Contact. In this contact, defined geometries act like one body. …
• No Separation Contact. Once the contact is detected, then the target and contact surface are tied up for the rest of the analysis. …
• Frictional Contact.

## What is MPC in Ansys?

Multi-point constraints (MPCs) are an advanced feature where you connect different nodes and degrees of freedom together in the analysis. They are often used to simulate a boundary condition effect when regular boundary conditions do not provide the correct behavior.

## What is rough contact in Ansys?

Rough. Similar to the frictionless setting, these setting models perfectly rough frictional contact where there is no sliding. It only applies to regions of faces (for 3D solids) or edges (for 2D plates). By default, no automatic closing of gaps is performed.

## What is bonded contact?

Bonded: This is the default configuration and applies to all contact regions (surfaces, solids, lines, faces, edges). If contact regions are bonded, then no sliding or separation between faces or edges is allowed. Think of the region as glued.

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## What is frictionless support in Ansys?

In ANSYS, Frictionless Support provide Support in normal direction to the selected face or edge. The body can not move or rotate or deform in normal direction. But free to move or rotate or rotate in tangential direction.

## What is weak spring in Ansys?

If Ansys Workbench detects an unstable structure, it adds “weak springs” on it to make it capable of withstanding small external forces. Although with this procedure it is possible to obtain a solution, it is strongly recommended to give enough supports to the structure to avoid errors in the solution.

## What is Keyopt in Ansys?

The KEYOPT command is an alternative method for inputting element key option (KEYOPT) values via the ET command. (Issue the ET command first to define ITYPE ). The KEYOPT command is required for inputting key options numbered higher than six (that is, > KEYOPT(6)).

## What is frictional stress in Ansys?

The frictional stress is the sum of stress components acting along the S and R directions (as shown in the below figure) and is a result of tendency of the two contacting surfaces to slide against each other.

## What is normal stiffness factor?

Enter the Normal Stiffness factor. The usual factor range is from 0.01-1.0. The default value of 1.0 is appropriate for bulk deformation. If bending deformation dominates, use a smaller value (0.1). A smaller value provides for easier convergence but with more penetration.

## What is displacement support in Ansys?

Displacement supports are used for applying imposed displacements & free movements in respective direction (X, Y & Z) as per support condition. Displacement is same as Fixed support when all translation movement are zero.

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## What is frictional support?

It is a type of support used to constrained degrees of freedom in normal directions. This support or boundary condition is used to prevent one or more flat or curved faces from moving or deforming in the normal direction.

## What is fixed joint in Ansys?

Summary: Fixed joint is type of joint with zero degree of freedom. Fixed joint is used to connect the two body having no relative motion between them.

## What is linear contact?

Linear contacts are widely used to define the contact between two adjacent components that have no relative movement. A sliding contact where friction is ignored also a linear contact. Linear contacts enable FE solutions to be more easily obtained.

## What is cylindrical support in Ansys?

Cylindrical support is defined in cylindrical coordinates. In the below picture z is axial, y is tangential and x is radial direction. You can plot the undeformed and deformed shape to better understand how the object is constrained.