CATIA V5 FEA Tutorials Releases 12 & 13 Nader G. Zamani University of Windsor SDC Schroff Development Corporation PUBLICATIONS
CATIA V5 FEA Tutorials 2-1 Chapter 2 Analysis of a Bent Rod with Solid Elements
2-2 CATIA V5 FEA Tutorials Clamped end loaded end Introduction In this tutorial, a solid FEA model of a bent rod experiencing a combined load is created. No planes of symmetry exist and therefore simplifications cannot be made. Finally, the significance of the von Mises stress in design equation is discussed. 1 Problem Statement The bent rod, shown to the right, is clamped at one end and subjected to a load of 2000 lb as displayed. The steel rod has a Young modulus of 30E+6 psi and Poisson ratio 0.3 . The nominal dimensions of the rod are also displayed below. Although this problem is more efficiently handled with beam elements, we propose to use solid elements. There are two types of solid elements available in CATIA V5: linear and parabolic. Both are referred to as tetrahedron elements and shown below. The linear tetrahedron elements are faster computationally but less accurate. On the other hand, the parabolic elements require more computational resources but lead to more accurate results. Another important feature of parabolic elements is that they can fit curved surfaces better. In general, the analysis of bulky objects requires the use of solid elements. 2 Creation of the Part in Mechanical Design Solutions Enter the Part Design workbench which can be achieved by different means depending on your CATIA customization. For example, from the standard windows toolbar, select File > New . From the box shown on the right, select Part . This moves you to the part design workbench and creates a part with the default name Part.1 . 5 in 8 in 1 in Cross sectional Radius is 1 in Tetrahedron Elements linear parabolic
Analysis of a Bent Rod with Solid Elements 2-3 In order to change the default name, move the curser to Part.1 in the tree, right click and select Properties from the menu list. From the Properties box, select the Product tab and in Part Number type wrench . This will be the new part name throughout the chapter. The tree on the top left corner of the screen should look as displayed below. From the tree, select the XY plane and enter the Sketcher . In the Sketcher, draw a circle , and dimension it . In order to change the dimension, double click on the dimension on the screen and in the resulting box enter radius 1. Your simple sketch and the Constraint Definition box used to enter the correct radius are shown below. Leave the Sketcher . From the tree, select the XY plane and enter the Sketcher . Draw the spine of the bent rod by using Profile and dimension it to meet the geometric specs. In the Sketcher, the spine should match the figure below on the right. Upon leaving the Sketcher , the screen and the tree should be as shown below.
2-4 CATIA V5 FEA Tutorials You will now use the ribbing operation to extrude the circle along the spine (path). Upon selecting the rib icon , the
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