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 # Class Friction

 Last update: 09.03.2026 

<a id="VM_API_Pre_Friction"></a>

Namespace: [VM.API.Pre](VM.API.Pre.md)  
Assembly: VM.API.Pre.dll

This class represents the friction

```csharp
public class Friction

```

#### Inheritance

object ← [Friction](VM.API.Pre.Friction.md)

#### Derived

[FrictionContact](VM.API.Pre.FrictionContact.md), [FrictionRevolute](VM.API.Pre.FrictionRevolute.md), [FrictionTranslational](VM.API.Pre.FrictionTranslational.md), [FrictionUniversal](VM.API.Pre.FrictionUniversal.md)

#### Extension Methods

[LinkPropertyItemCache.GetLinkProperties(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkProperties_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkPropertiesAndValues(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkPropertiesAndValues_System_Object_VM_Models_Pre_LinkPropertyType_), [LinkPropertyItemCache.GetLinkedObjects&lt;T&gt;(object, LinkPropertyType)](VM.Models.Pre.Cache.LinkPropertyItemCache.md#VM_Models_Pre_Cache_LinkPropertyItemCache_GetLinkedObjects__1_System_Object_VM_Models_Pre_LinkPropertyType_)

## Constructors

### <a id="VM_API_Pre_Friction__ctor"></a> Friction()

Default constructor

```csharp
public Friction()

```

### <a id="VM_API_Pre_Friction__ctor_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Managed_DAFUL_Constraints_Friction_EffectType_"></a> Friction(ExpressionValueVariable, ExpressionValueVariable, ExpressionValueVariable, ExpressionValueVariable, ExpressionValueVariable, EffectType)

Initializes a new instance of the  class.

```csharp
public Friction(ExpressionValueVariable frictionCoefficient, ExpressionValueVariable staticFrictionCoefficient, ExpressionValueVariable dynamicsThreshold, ExpressionValueVariable stictionVelocity, ExpressionValueVariable maxStictionDeformation, Friction.EffectType frictionEffect)

```

#### Parameters

`frictionCoefficient` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The friction coefficient.

`staticFrictionCoefficient` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The static friction coefficient.

`dynamicsThreshold` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The dynamics threshold.

`stictionVelocity` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The stiction velocity.

`maxStictionDeformation` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The max stiction deformation.

`frictionEffect` [Friction](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/Data/VMDCB/Friction.cs).[EffectType](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/Data/VMDCB/Friction.cs)

The friction effect.

### <a id="VM_API_Pre_Friction__ctor_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Models_Pre_ExpressionValueVariable_VM_Managed_DAFUL_Constraints_Friction_EffectType_System_Boolean_System_Boolean_"></a> Friction(ExpressionValueVariable, ExpressionValueVariable, ExpressionValueVariable, ExpressionValueVariable, ExpressionValueVariable, EffectType, bool, bool)

Initializes a new instance of the  class.

```csharp
public Friction(ExpressionValueVariable frictionCoefficient, ExpressionValueVariable staticFrictionCoefficient, ExpressionValueVariable dynamicsThreshold, ExpressionValueVariable stictionVelocity, ExpressionValueVariable maxStictionDeformation, Friction.EffectType frictionEffect, bool reactionForce, bool bendingMoment)

```

#### Parameters

`frictionCoefficient` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The friction coefficient.

`staticFrictionCoefficient` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The static friction coefficient.

`dynamicsThreshold` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The dynamics threshold.

`stictionVelocity` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The stiction velocity.

`maxStictionDeformation` [ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

The max stiction deformation.

`frictionEffect` [Friction](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/Data/VMDCB/Friction.cs).[EffectType](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/Data/VMDCB/Friction.cs)

The friction effect.

`reactionForce` bool

The reaction force.

`bendingMoment` bool

The bending moment.

## Properties

### <a id="VM_API_Pre_Friction_BendingMoment"></a> BendingMoment

The value for the bending moment. The default value is 'true'.

```csharp
public bool BendingMoment { get; set; }

```

#### Property Value

bool

### <a id="VM_API_Pre_Friction_DynamicsThreshold"></a> DynamicsThreshold

The value for the dynamics threshold. The default value is 0.15.

```csharp
public ExpressionValueVariable DynamicsThreshold { get; set; }

```

#### Property Value

[ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

### <a id="VM_API_Pre_Friction_FrictionCoefficient"></a> FrictionCoefficient

The value for the friction coefficient. The default value is 0.3.

```csharp
public ExpressionValueVariable FrictionCoefficient { get; set; }

```

#### Property Value

[ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

### <a id="VM_API_Pre_Friction_FrictionEffect"></a> FrictionEffect

The value for the friction effect. The default value is .

```csharp
public Friction.EffectType FrictionEffect { get; set; }

```

#### Property Value

[Friction](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/Data/VMDCB/Friction.cs).[EffectType](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/ClassicPre/Data/VMDCB/Friction.cs)

### <a id="VM_API_Pre_Friction_MaxStictionDeformation"></a> MaxStictionDeformation

The value for the max stiction deformation. The default value is 0.01.

```csharp
public ExpressionValueVariable MaxStictionDeformation { get; set; }

```

#### Property Value

[ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

### <a id="VM_API_Pre_Friction_ReactionForce"></a> ReactionForce

The value for the reaction force. The default value is 'true'.

```csharp
public bool ReactionForce { get; set; }

```

#### Property Value

bool

### <a id="VM_API_Pre_Friction_StaticFrictionCoefficient"></a> StaticFrictionCoefficient

The value for the static friction coefficient. The default value is 0.5.

```csharp
public ExpressionValueVariable StaticFrictionCoefficient { get; set; }

```

#### Property Value

[ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)

### <a id="VM_API_Pre_Friction_StictionVelocity"></a> StictionVelocity

The value for the stiction velocity. The default value is 0.1.

```csharp
public ExpressionValueVariable StictionVelocity { get; set; }

```

#### Property Value

[ExpressionValueVariable](https://github.com/AnsysVirtualMotion/DAFUL/blob/9110677a5f6a53d7604f8dfd35b4c5fceb59e8e0/DAFUL/Pre/Data/VM.Models.Pre/Models/ExpressionValueVariable.cs)