Leaf Spring 1 Step Leaf Spring (Material, Contact, geometric nonlinearity) Summary Summary 00 Nonlinear Static Analysis - Unit: N, mm - Geometric model: Leaf Spring.x_t Nonlinear Material configuration - Stress - Strain Curve definition creation of Contact Condition - General Contact (Rubbing consideration) Boundary and Load conditions - Pinned, User defined - Translational Disp. Results verification - Total displacement - View of results in animation
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Leaf Spring 1
Step
Leaf Spring (Material, Contact, geometric nonlinearity)
Summary
Summary 00 Nonlinear Static Analysis
- Unit: N, mm
- Geometric model: Leaf
Spring.x_t
Nonlinear Material configuration
- Stress - Strain Curve
definition
creation of Contact Condition
- General Contact (Rubbing
consideration)
Boundary and Load conditions
- Pinned, User defined
- Translational Disp.
Results verification
- Total displacement
- View of results in animation
Leaf Spring 2
Step
00 Analysis Summary
Creation of nonlinear contact
- Create nonlinear contact with manual contact function.
- Define contact between surfaces which are not in contact at the initial stage of the analysis, but will enter in contact during the analysis
- Make the model return to its initial position using Subcases
Tutorial purpose
Analysis Summary Target model Boundary Condition (Pinned, User defined) Load (Translational Disp.)
Pinned User defined (X,YAxis Boundaries )
Translational Disp. (After -ZAxis 8mm Translation, Return to its original position)
Leaf Spring 3
Step
00 Analysis Summary
Manual Contact
• Not in contact at the beginning of the Analysis. • After a vertical displacement in the bottom direction, the contact will be established
Contact establishment Contact establishment
•In this case, it is difficult to define automatically the contact when the spring isn’t in contact with the plate. •The user has to define manually the surfaces where the contact will be established. • Let’s see how a manual contact can be assigned in the Step 07 of this tutorial.
Leaf Spring 4
Step
Procedure
Model > Geometry> Import 01 Click on [ ] (New) Icon.
Click on [Geometry] - [Import].
Model: Select Leaf Spring.x_t.
Uncheck [Search Contact Faces].
Click on [Open].
※ Tutorial Models are at the same
location than midas NFX in the
folder Manuals / Tutorials /Files
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If the option [Search Contact Faces]
is checked, contacts will be
automatically defined to the faces in
contact.
The purpose of this tutorial is to
learn how to apply the contacts, so
we will uncheck this option.
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• Please verify the length unit of the model !
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Leaf Spring 5
Step
Procedure
Model > Geometry> Material 02
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Click on [Geometry] - [Material].
ID: “2” , Name: Enter “Spring”.
Select [Nonlinear] Tab.
Type of Material nonlinearity: Select
"Elasto Plastic".
Elastic Modulus: Enter “236339.3”.
Poisson's ratio: Enter“0.266”.
Check "Stress strain Data".
Click on the icon "Data Creation".
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By clicking on this Tab, a nonlinear
material is automatically defined.
Enter the Stress - Strain Curve.
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Explanation continues On the next page
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Leaf Spring 6
Step
Procedure
Model > Geometry> Material
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03 Name: Enter “Nonlinear Material”.
Strain: “(0)”, Stress: “(0)”
Strain: “(0.00112)”, Stress: “(264.70)”
Strain: “(0.00400)”, Stress: “(264.70)”
Strain: “(0.00837)”, Stress: “(276.14)”
Strain: “(0.01811)”, Stress: “(332.96)”
Strain: “(0.03170)”, Stress: “(383.16)”
Strain: “(0.04574)”, Stress: “(414.51)”
Strain: “(0.06505)”, Stress: “(439.14)”
Strain: “(0.08273)”, Stress: “(451.17)”
Strain: “(0.10447)”, Stress: “(458.31)”
Strain: “(0.12521)”, Stress: “(460.50)”
Click on [OK].
Stress - Strain Data: Select
“Nonlinear material”.
Click on [OK].
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For this tutorial, a plastic type stress-
strain curve is used.
The second point “0.00112” is the
last point of the elastic section for
this material and then it will be
defined as the yield stress.
Leaf Spring 7
Step
Procedure
Model > Geometry> Material 04 Click on [Geometry] - [Material].
ID: “3” , Name: Enter “Rigid”.
Elastic Modulus: Enter“2.5e5”.
Poisson's ratio: Enter“0.266”.
Click on [OK].
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Leaf Spring 8
Step
Procedure
Model > Geometry> Material (Material Assignment) 05 After selection of the model in the
working window, Right-click with the
mouse.
Select [Material] >[Spring].
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Leaf Spring 9
Step
Procedure
Model > Geometry> Material (Material Assignment) 06 After selection of the model in the
working window, Right-click with the
mouse
Select [Material] > [Rigid].
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Leaf Spring 10
Step
Procedure
Model > Geometry> Contact 07 Click on [Geometry] - [Contact].
Select [Manual Contact] Tab.
Select "Surface to Surface Contact".
Contact Type: Select "General
contact".
Master Faces: Select 1 Surface.
(Select the upper face of the plate.)
Slave Faces: Select 2 Surfaces.
(Select the both side surfaces below
the spring model.)
Click on the icon [ ] at the right
of the contact parameters.
ID: “2” , Name: Enter “Friction”.
Coefficient of Static Friction :
Select “0.3”.
Click on [OK].
Contact Parameters: Select Friction.
Click on [OK].
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General Contact: if general contact is used between two surfaces, when these two surfaces are in contact or not, the analysis is always possible, Master plane is displayed in red, whereas slave plane is displayed in blue.
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Leaf Spring 11
Step
Procedure
Model > Boundary > Support 08 Click on [Boundary] - [Support].
Click on [ ] (Top) Icon.
Name: Enter “Support” .
Target: Select 2 Surfaces (Reference
Picture)
Condition: Select [Pinned].
Click on [Apply].
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Leaf Spring 12
Step
Procedure
Model > Boundary > Support 09 Name: Enter “X,Y Fix”.
Method: Select [User defined].
Target: Select 1 Plane. (Reference
picture)
DOF: Select [Tx], [Ty].
Click on [OK].
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In order to restraint the movement
of the spring in Z direction only, we
have to fix its translation in X and Y
directions.
Leaf Spring 13
Step
Procedure
Model > Static load >Translational Disp. 10 Click on [Static Load] -