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tutorial Ansys V 10, Resumos de Engenharia Mecânica

Tutorial resumido, mas bom, 25 paginas

Tipologia: Resumos

Antes de 2010

Compartilhado em 06/11/2009

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Baixe tutorial Ansys V 10 e outras Resumos em PDF para Engenharia Mecânica, somente na Docsity! ANSYS ® Workbench Tutorial ANSYS Release 10 Kent L. Lawrence Mechanical and Aerospace Engineering University of Texas at Arlington SDC Schroff Development Corporation www.schroff.com www.schroff-europe.com PUBLICATIONS Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-1 Chapte 1 Solid Modeling Fundamentals 1-1 OVERVIEW A simple L-shaped cross section is used to introduce basic solid modeling concepts with ANSYS DesignModeler. These tutorials explore modeling by: ♦Extruding ♦Revolving ♦Sweeping A number of additional parametric, feature-based modeling possibilities and formulations are demonstrated in this chapter. 1-2 INTRODUCTION Solid modeling can be accomplished in a number of ways, and one favorite method involves starting with a two-dimensional shape and manipulating it to create a solid. That is the approach we will use for many of object models created in this book. Figure 1-1 shows an L-shaped cross section that has been variously extruded, revolved, or swept along a curve to produce the solid object models shown. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material 1-4 Solid Modeling Fundamentals 3. Select OK – To work in millimeter units. We will sketch the L-shaped cross section on the XY Plane. Make it 35 mm high, 20 mm wide with 5 mm thick legs. 4. Select XYPlane as in the figure below. Then click on the Look at icon to view the XYPlane. Figure 1-5 Select the sketching plane. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-5 Figure 1-6 View of the sketching plane. 5. Sketching. Change from Modeling to Sketching by selecting the Sketching tab. Select Draw > Line Figure 1-7 Sketching tools. 6. Use the line drawing tool to draw the left vertical edge of the L-shape. Left click at the beginning and again at the end of the line. The V indicates that you’ve got it exactly vertical. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material 1-6 Solid Modeling Fundamentals Figure 1-8 Left edge of the L-shape. 7. Continue sketching until you have something like what is shown below. (Notice that the top edge is not quite horizontal.) If you need to change something, use the New Selection, Edge filter to select the line, press the delete key and redraw it. Also note that the cursor changes shape when it is snapped onto another point or axis. Figure 1-9 L-section sketch. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-9 13. View > Ruler (Top menu) to turn off the ruler display. Use the middle mouse roller to zoom in and out. The result is shown in the figure below. Figure 1-14 Edited dimension values. To reposition the section on the screen, Right Click and select one of the following options: Cursor Mode, View, or Zoom to Fit. To perform the extrusion, switch from Sketching to Modeling. If is not already highlighted, click Sketch1 to highlight it. 14. Modeling > Sketch1 > Extrude The L-shaped section will be extruded along the positive Z axis by the amount specified in the Depth field shown in the next figure. Edit this value (45 mm) to give the solid a depth of 100 mm. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material 1-10 Solid Modeling Fundamentals The tree structure shows the components from which the solid model is created. Figure 1-15 Section ready for extrusion. 15. Click the Generate icon to complete creation of the extruded shape model. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-11 Right click > View > Isometric (or hold down the middle mouse button and rotate the object). Figure 1-16 Extrusion. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material 1-14 Solid Modeling Fundamentals Figure 1-19 Select the extrusion. 1. Click on Extrude1 and press Delete. Click Yes to the query. The extrusion is deleted and the new tree structure shows 0 Parts and 0 Bodies. Figure 1-20 Delete the extrusion. 2. Use Save As to save this work using a new file name, say Tutorial1B. 3. Click on Sketch1, the Display Plane icon and the Look at Plane icon We obtain the view of the same sketch we had earlier. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-15 Figure 1-21 Select the sketch. 4. Be sure Sketch1 is highlighted and Click Revolve. 5. Click Axis > Select the Y axis > Apply (below right) 6. Select Angle > Enter 120 deg. 7. Click Generate The L-shaped section is rotated about the Y axis by 120 degrees using a right-hand rule to create the solid of revolution shown next. Figure 1-22 Revolve1 tree. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material 1-16 Solid Modeling Fundamentals Figure 1-23 Solid of revolution. 8. Save to archive your work. Next we will take the same cross section and sweep it along an arbitrary path to create the third kind of modeling discussed in this chapter. 1-5 TUTORIAL 1C – SWEEP 1. Start ANSYS Workbench. Sketch the 20 x 35 mm L-shape on the XYPlane as before. We get the figure shown below. Save this file as tutorial1c or T1C or something convenient. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-19 Figure 1-26 Profile and path selection. 7. Generate to obtain the solid shown next. Figure 1-27 Swept solid. Notice that the profile is not necessarily perpendicular to the path as when we used Extrude to create a solid. Also the path can be a more complex curve as in the example of Figure 1-1 where a spline was used for the path. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material 1-20 Solid Modeling Fundamentals 1-6 SKETCHING A wide variety of sketching tools are available to help in creating two-dimensional sections. We used the line drawing option and the equality constraint option in the tutorials above. Some of the other sketching features are shown below. The next illustration shows the Draw and Modify options. The Draw menu includes Line, Tangent Line, Line by two Tangents, Polyline, Polygon, Rectangle, Oval, Circle, Arc, Ellipse, Spline and Construction Point. The Modify menu includes Fillet, Chamfer, Trim, Extend, Split, Drag, Cut, Copy, Paste, Move, Replicate and Offset. Figure 1-28 Draw and Modify sketching options. We will have the occasion to illustrate the use of many of these options in what follows. Copyrighted Material Copyrighted Material Copyrighted Material Copyrighted Material Solid Modeling Fundamentals 1-21 Menu selections for assigning Dimensions and enforcing Constraints are shown in the next figure. In addition to a General dimension specification, Dimensions can be assigned which are Horizontal, Vertical, Length/Distance, Radius/Diameter, or an Angle. Select Semi- Automatic Dimensioning if you want DesignModeler to select a dimensioning scheme automatically. You then have the option to accept, add or delete dimensions to meet your specific design needs. Constraints that can be enforced for sketching entities include Horizontal, Vertical, Perpendicular, Tangent, Coincident, Midpoint, Symmetric, Parallel, Concentric, Equal Radius, Equal Length and Equal Distance. As sketching proceeds DesignModeler will attempt to detect and enforce constraints that seem to be part of the design intent of the sketch. The Auto Constraints option allows you to turn these on and off as desired. Cursor triggered constraints are local, while Global constraints relate to all entities in the sketching plane. Figure 1-29 Dimension and Constraint sketching options.
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