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FreeCAD: Stress Analysis (1/3)

Update: July 13, 2021
FreeCAD 0.19

Summary

In this tutorial, we will do static analysis for loaded L-shape joint and get it's deformation and stress. Then we will change the shape parametrically to improve the result.

Fig. Shape to be calculated
Shape to be calculated
Calculating result
Calculating result

Creating the shape

  1. Creating new document

    Start FreeCAD and create new documentnew document icon.

  2. Creating new sketch plane

    Switch workbench to Part Design workbenchWorkbench_PartDesign.

    Create new sktch planenew sktch plane icon and select XY-plane on the dialog. Then click OK.

    Creating new sktch dialog
    Creating new sktch dialog
  3. Drawing the sketch

    Select polylineSketcher_CreatePolyline and draw rough sketch for the joint.

    Drawing rough sketch
    Drawing rough sketch

    With holizontal distance constraintConstraint_HorizontalDistance and vertical distance constraintConstraint_VerticalDistance, set the length and width to 100 mm and 30 mm, respectively, as shown in the figure below.

    Constrainting the distances
    Constrainting the distances

    Round the corner of the L-shape with filletSketcher_CreateFillet.

    Round the corner
    Round the corner

    Select the rounded corner and set the radius to 5 mm with radius constraintConstraint_Length.

    Constrainting the radius
    Constrainting the radius

    Create 2 circlesConstraint_Length for screw hole. Set the radius to 7.5 mm with radius constraintConstraint_Length and the center position of the circle as shown in the figure below, with holizontal distance constraintConstraint_HorizontalDistance and vertical distance constraintConstraint_VerticalDistance.

    Creating circles for screw hole
    Creating circles for screw hole

    Match the sketch plane origin with the point at the bottom left of the sketch with point-on-point constraintConstraint_PointOnPoint. So the sketch will be draw with green line because it is fully constrained. Then click Close on task tab to finish sketch editing.

    Fully constrained sketch
    Fully constrained sketch
  4. Extruding the sketch

    Using paddingPartDesign_Pad, extrude the created sketch with an extrusion dimension of 5 mm to create the shape to be analyzed.

    The shape to be analyzed.
    The shape to be analyzed.

The next step is to set up the analysis.

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