University of Puerto Rico at Mayagüez Department of Mechanical Engineering Introduction to NX 6.0 Tutorial 1 Modified by (2011): Dr. Vijay K. Goyal and Dr. Ricky Valentin Associate Professors Juan Reines, Graduate Student Michael Jr. Cruz, Undergraduate Student Department of Mechanical Engineering University of Puerto Rico at Mayagüez

Problem Description In this Tutorial we will create the model show in the figure below. This is a typical solid piece that can be manufactured and therefore proper modeling techniques are necessary. This model consist of five features. In the process of creating the five features we will learn the preliminary steps to understand the principles of modeling and sketching packages in NX-6.

Problem Description Schematic Drawing of solid part:

Go to Sketch, click on the drop down menu in the Sketch Plane rollout and choose Create Plane then click on the Full plane tool and choose from the drop down menu under Plane the YC-ZC plane, pick Absolute and click OK, on the Offset and Reference menu then pick a reference and click OK. Creating the Base Feature

Now we can draw the L shape on this plane. Select Line and draw as shown below. For example, when creating the first line of 30mm upwards, we can select the starting point with the cursor and write 30 in distance and 90 on angle. Now select finish sketch on upper left corner. Creating the Base Feature

After creating the plane, we need to draw the open sketch as seen below. Click on Line. After finishing exit sketcher by clicking: Finish Sketch Creating the Base Feature

Click on: Finish Sketch > Extrude Finish Sketch Extrude Creating the Base Feature

Click on Extrude, select the sketch and select Symmetric Value option from the Start drop-down list in the Limits rollout. Enter 72/2 as the value in the Distance edit box located below the Start drop-down list; the value in the Distance edit box located below the End drop-down list also changes automatically to 36. Then expand the Offset rollout and select the Two-sided option from the Offset drop-sown list; the Start and End edit boxes are displayed. Enter -25 as the value in the Start edit box. Set the value of the End edit box to 0. Click OK to create the base feature.

Creating the Second Feature The second feature is an extrude feature that can be created using the Boolean operation of Subtract. The sketch for this feature will be drawn on the face of the base feature. First, click Sketch, select the front face of the base feature and click OK.

Second, draw a rectangular sketch for the cut feature. Make the bottom line and the left line of the rectangle collinear with the edges of the base feature. Click Finish Sketch Creating the Second Feature

Third, click Extrude and select the sketch. Select the Subtract option from the Boolean drop down list and reverse the direction of the extrusion. Enter 72 in the Distance edit box which is available below the End drop down list and then choose the OK button from the dialog box. Creating the Second Feature

Select sketch and select top of the part as shown on the figure on the right. Start the first point on the lower right of the part and insert the lines and arcs with the following dimensions with the following order. Now we need to remove lines 3 and 1 leaving the feature to cut. To remove line 3 and 1 use the Quick trim feature. Click on the Quick Trim Icon to cut out the extra lines. Click on the lines marked with an X on the figure to the left Creating the Third Feature X X

Click Finish Sketch and click on Extrude. Select the Subtract option from the Boolean drop down list and reverse the direction of extrusion. Select the Through All option from the End drop down list and choose OK from the dialog box. Creating the Third Feature

Creating the Fourth Feature The sketch for this feature will be drawn on the front face of the base feature and will be extruded to a depth of 12 mm using the Subtract operation. First, click on Sketch, select the face of the base feature and click OK.

Second, Draw the sketch shown below. Using the Quick Trim tool Creating the Fourth Feature

Third, click Finish Sketch and click on Extrude. Fourth, from the Extrude window select the Subtract option from the Boolean drop down list and reverse the direction of the extrusion. Enter 12 in the Distance edit box which is available below the End drop down list and then choose the OK button from the dialog box. Creating the Fourth Feature

To create the fifth feature, draw a circle on the new face that is exposed because of the last cut feature and then extrude the circle using the Subtract operation and the Through All termination. Creating the Fifth Feature

Creating the Fifth Feature (cont.)

On the top left corner select the drop down of Start and select Advanced Simulation. On the Simulation Navigator right click on tutorial_1.prt Select New FEM and Simulation. Make sure Structural is selected on the Analysis Type section and hit ok. On the Solution Type you can select the constrain you want, on our case select SESTATIC 101 – Single Constraint and click ok. Creating the mesh

Use the 3D Tetrahedral Mesh feature as shown in figure on the right. This feature is available on the _prt_fem1 Session on the Simulation File View. On the Overall Element Size, choose 8 or less. Click on the solid model and ok.

Creating the mesh(cont). Use the Mesh Control feature as shown in figure on the right. Use Size on Face, on the Density Types section Select hole as shown on figure. On the Element Size section, use 2mm or less and click ok.

Creating the mesh(cont). Use Update Finite Element Model feature shown on the figure in order to regenerate the mesh. Now the element size on the orifice will become smaller…

Creating the mesh(cont). Do the same procedure with the other extrude section of the model as shown on the figure.

Creating the mesh(cont). When the meshing procedure is done, you can appreciate the different element densities on the solid model.

Creating material properties Click on the Material Properties icon shown on the figure. This feature is available on the _prt_fem1 Session on the Simulation File View. Click on the Library icon on the Materials window.(shown on the lower section of the figure) On the Search Criteria window, select metals on the Category section and click ok. Select Aluminum_6061.(you can select the material you like, but this tutorial is done with Lib Ref. #3.

Creating material properties Because a material from NX’s library was chosen, you can see default properties on the main window! Select the solid model to assign properties. Click ok.

Click on the Constraint Type icon shown. Select Fixed constraint. This feature is available on the _prt_sim1 Session on the Simulation File View. Select the surfaces shown in orange as done on the figure. The constraint faces will appear in each node as shown on the figure below. Creating Constraints

Creating Loads Click on the Load Type icon shown. Select Force feature shown on the figure. This feature is available on the _prt_sim1 Session on the Simulation File View. Select Normal force. Select the faces shown in figure below. Select a magnitude N and click ok. (this is done to assign proper force direction).

Creating Solution Right-Click with the mouse on the Solution 1 from the Simulation Navigator. Click Solve. This feature is available on the _prt_sim1 Session on the Simulation File View. On the Solve window, click ok. When solver finishes, a Results icon will appear in the Simulation Navigator. Double- click and on the Post- Processing Navigator, expand Solution 1 as shown in the figure below.

Creating Solution Shown in the figure Von- Mises stresses. In order to play the animation, click the play icon circulated on the figure. If this icon is not visible, you can always use the Command Finder icon!

Saving the File Choose File > Save All from the menu bar to save the file. ** On the figure: Displacement- Nodal/Magnitude solution