SS-T: 4010 Structural Non-linear Analysis

Run structural non-linear analysis in SimSolid.

SimSolid performs meshless structural analysis that works on full featured parts and assemblies, is tolerant of geometric imperfections, and runs in seconds to minutes. In this tutorial, you will do the following:
  • Create structural non-linear analysis (material and contact).
Model Description
The following files are needed for this tutorial:
  • Material_Separating_NonLinearity.ssp
  • Stress_strain_curve.csv

Figure 1.
The project file has the following specifications:
  • Material is set to Aluminum for all parts.
  • Regular connections with 0.6mm gap and 0.3mm penetration tolerance.
  • For the sake of analysis, all sliding contacts have been changed to bonded.

Open Project

  1. Start a new SimSolid session.
  2. On the main window toolbar, click Open Project .
  3. In the Open project file dialog, choose Material_Separating_NonLinearity.ssp
  4. Click OK.

Define Non-linear Material

  1. In the main menu, click Settings > Material database.

    Figure 2.
  2. In the dialog, right-click on the Sample non linear materials folder and select Add Material from the context menu.

    Figure 3.
  3. Select Add stress-strain curve....
  4. Click Edit.
  5. Import the Stress-strain curve.
    1. In the Stress-strain curve window, click Import CSV.
    2. In the import units window, select Pascal.
    3. In the File explorer, browse to Stress_strain_curve.csv and click Open.
    4. In the dialog, click OK.

      Figure 4.
    In the Edit Material database dialog, you can see the Elasticity Modulus was calculated from the imported Stress-strain curve.

    Figure 5.
  6. Enter other values in the dialog,
    1. For Poisson's ratio, enter 0.3
    2. For Density, enter 7.85e+03.
    3. For Ultimate tensile stress, enter 0.
    4. For Thermal expansion coeff., enter 1.2e-5.
    5. For Thermal conductivity, enter 5.6e+1.
  7. Edit material name to Steel NL.
  8. Click Apply.
  9. Click Save.

Assign Materials

  1. On the Project Tree, click on the Assembly workbench.
  2. In the Project Tree, hold down Control and multi-select parts as shown in Figure 6.
    Figure 6.
  3. Click (Apply material).
  4. In the dialog, click to expand the Sample non-linear materials folder.
  5. Pick Steel NL from the list.
  6. Click Apply to selected parts.

    Figure 7.
  7. Click OK.
    In the Assembly branch of the Project Tree, material properties are identified for each part.

Create Structural Non-linear Analysis

  1. In the main window toolbar, click > Structural non-linear.

    Figure 8.
  2. In the dialog, activate the Separating contact and Material non-linear check boxes.

    Figure 9.
  3. Click OK.

Edit Contact Conditions

  1. In the Project Tree, expand the Connections branch.
  2. Hold down Control and multi-select connections as shown in Figure 10.

    Figure 10.
  3. Right-click and select Edit Default contact conditions from the context menu.
  4. In the dialog, select Separating.
  5. Set Friction coefficient to 0.1.
  6. Click OK.

    Figure 11.

Create Immovable Support

  1. In the Analysis Workbench, click Immovable Support .
  2. In the dialog, verify the Faces radio button is selected.
  3. In the modeling window, select the faces shown in orange in Figure 12.

    Figure 12.
  4. Click OK.

Tighten Bolts

  1. On the Analysis Workbench, select (Bolt tightening).
  2. In the modeling window, select the bolts as shown in Figure 13.

    Figure 13.
  3. For Thread pitch, enter 1.25.
  4. For Number of turns, enter 1.
  5. Click OK.

Define Load

  1. In the workbench toolbar, select > Force/Displacement.

    Figure 14.
  2. In the dialog, select the Face radio button.
  3. Select the face as shown in Figure 15.

    Figure 15.
  4. Under Total force or displacement along axes, for Z enter -10000.
  5. Click OK.

Run Analysis

  1. On the Project Tree, open the Analysis Workbench.
  2. Click (Solve).

Review Results

  1. On the Analysis Workbench toolbar, click (Results plot).
  2. In the menu, select Displacement Magnitude.
    The Legend window appears showing the contour plot. The Results window appears. You can review the plot for different zones.

Review Bolt Forces

  1. On the Analysis Workbench, toolbar, select (Bolt/Nut resultant forces).
    The Bolt/nut forces dialog is shown.
  2. Optional: To save forces as a .csv file, select Save CSV in the dialog.

Review Contact Response

On the Analysis Workbench, toolbar, select (Contact response).
Figure 16.
The Response at connections dialog is shown.