SIMULAIOTN AND MODELING LAB

EXPERIMENT NO 1

OBJECTIVE:- To learn how the suite of I-DEAS applications is organizedi. how to start I-DEASii. how to create a team workspace, where youll share information with othersiii. how to create a personal workspaceDESCRIPTION:-I-DEAS (Integrated Design, Engineering, and Analysis Software) is a collection of applications that share a master model that is, a solid model that can be associated with various applications.

The master model is:i) created and documented in Designii) analyzed in Simulationiii) machined in ManufacturingEach application has concurrent access to the master model.

Concurrent Engineering

When the master model changes, I-DEAS automatically updates:i) drawingsii) finite element modelsiii) tool paths This associativity allows multiple users to work concurrently.

Using The I-DEAS Start Form

PROCEDURE:-

Start I-DEAS and fill out the I-DEAS Start form:

1. Name the project for your team. For example, Part Design Class Team 1. Remember, this project will be your teams workspace.2. Enter a name in the Model File field. Remember, this is your personal work space.3. With the left mouse button, press and hold the Application button. Note the list of available applications. Pick Design from the list.4. Similarly, press and hold the Task button and pickMaster Modeler from the list.5. Pick OK.

RESULT: EXPERIMENT NO. 2

OBJECTIVE : To learn interacting with I-DEAS i) using the three-step modeling process ii) using the Dynamic Navigator iii) creating a section and a solidDESCRIPTION: The icon panel has four main areas: 1. pull-down menus 2. task icons3. application icons4. common icons.

i) Use the graphics window to create, select, and modify graphical entities, and do most of your work. Cascading menus and pop-up menus, when displayed, appear in this window.

ii) The Prompt window displays information that tells you what to do to complete a process or task. You can respond to the prompt by entering data on the command line.

iii) The List window displays important data about your process or the data entities youve created.

USE YOUR MOUSE TO PICK MODELING ENTITIES:

i) Generally, if you can see it, you can pick it. Just put your pointer on the entity and press the left mouse button. The entity will highlight to show that its selected.

ii) To pick more than one entity at a time, hold the Shift key while picking, or drag a box around several nearby entities. Pick a selected entity to deselect it.

USING FUNCTION KEYS FOR DYNAMIC VIEWING

If you cant see something that you want to pick, use dynamic viewing to change your view of the workbench. Frequently, you can simply rotate your view or zoom in or out to see the entity that you want to pick.i) To control dynamic viewing, press and hold down a function key and move your mouse.ii) Use F3 to do X,Y, or Z rotation. If the cursor is within 80% of the viewport center, the mouse controls X and Y rotation. If the cursor is outside the 80% circle, rotations are performed about the screen Z axis as you move the mouse in a circular motion.iii) Use F4 to automatically rotate your view to the nearest standard view. For example, if the closest standard view is the front view, picking F4 automatically gives you a front view.

Additional Function Keys

In addition to the function keys already mentioned, you also can use the function keys shown above. These keys mimic frequently used mouse control actions. In general, theyre particularly handy while a command is active.

EXPERIMENT NO. 3

OBJECTIVE : To learn three step-modeling process i) Sketching wireframe using the Dynamic Navigatorii) Creating constraints

DESCRIPTION : Whether starting from scratch or adding features to an existing part, youll build parts in I-DEAS using this typical 3-step process:1. Establish a plane on which to create two-dimensional wireframe.2.Sketch and constrain your wireframe. To begin, rough-sketch construction lines without worrying about being overly accurate. You can then incorporate design intent by creating additional constraints and dimensions.3. Create the new part or feature from an operation (extrude, revolve, and so on). Repeat the process until you fully define the part.

IN MORE DETAIL:Sketchplanes can be: Part face Reference geometry Coordinate system Workplane(workplanes are not associative)

2D wireframe shapes: Lines Arcs Splines Ellipses

Constraints: 2D geometric or dimensional Can match dimensions or use equations

3D features are created by: Extrude Revolve Loft Sweep

DYNAMIC NAVIGATOR:

When youre sketching on the workplane, the Dynamic Navigator can help you:i) navigate to logical engineering positions relative to previously sketched wireframeii) add constraintsiii) add dimensionsThe Dynamic Navigator is your assistant. If its not providing the kind of feedback you want or the types of constraint assignments youre looking for, you can modify its behavior using the right mouse button.

CONSTRAINTS Add or remove constraints to ensure your design intent, so that your wireframe behaves predictably. If wireframe is not fully constrained, its still free to move. You should anchor your wireframe and add constraints and dimensions until your wireframe is fully constrained. added a constraint pick Undo immediately

EXPERIMENT NO.4

OBJECTIVE: To learn to create a Finite Element (FE) model and define new material properties

DESCRIPTION: The traditional approach for validating a design is to build a prototype and test it. If the test reveals problems with the design, the design should be changed, and a new prototype should be developed and tested. An alternative approach is to use finite element analysis (FEA). FEA has some of the following benefits:i) simulates how your product will perform in a virtual environmentii) reduces product cost and development time by reducing prototypesiii)optimizes the design

DEFINITION Finite element analysis is the process by which you break a continuous structure into a finite number of regions, or elements. Each element:i) is a mathematical representation of a discrete portion of the physical structureii) has an assumed displacement interpolation functionFEA consists of a computer model of a material or design that is stressed and analyzed for specific results. It is used in new product design, and existing product refinement. A company is able to verify a proposed design will be able to perform to the client's specifications prior to manufacturing or construction. Modifying an existing product or structure is utilized to qualify the product or structure for a new service condition.In case of structural failure, FEA may be used to help determine the design modifications to meet the new condition.There are generally two types of analysis that are used in industry: 2-D modeling, and 3-D modeling. While 2-D modeling conserves simplicity and allows the analysis to be run on a relatively normal computer, it tends to yield less accurate results. 3-D modeling, however, produces more accurate results while sacrificing the ability to run on all but the fastest computers effectively. Within each of these modeling schemes, the programmer can insert numerous algorithms (functions) which may make the system behave linearly or non-linearly. Linear systems are far less complex and generally do not take into account plastic deformation. Non-linear systems do account for plastic deformation, and many also are capable of testing a material all the way to fracture.

Creating A FE Model

To build a finite element model (FEM), use Create FE Model. The following are characteristics of FEMs in I-DEAS:i)You can create a FEM of a part or an assembly. A part should be named before you create a FEM.ii)A FEM is associated to a part. You can create as many FEMs of a part as necessary.iii)Only one FEM can be on the workbench at a time.iv)FEMs can be checked into and out of libraries.

SPECIFY THE MATERIALWhen you select Create FE Model, youll be able to:i)specify the part or assembly for the FEMii) specify the part material (If no material is specified, the default STEEL will be used.)iii) name the FEM

EXPERIMENT NO. 5

OBJECTIVE : Learn how to create a finite element modeli) apply boundary conditionsii) mesh the FE modeliii) solve the FE modeliv) display the resultsDESCRIPTION:- FEA uses a complex system of points callednodeswhich make a grid called amesh. This mesh is programmed to contain the material and structural properties which define how the structure will react to certain loading conditions. Nodes are assigned at a certain density throughout the material depending on the anticipated stress levels of a particular area. Regions which will receive large amounts of stress usually have a higher node density than those which experience little or no stress. Points of interest may consist of: fracture point of previously tested material, fillets, corners, complex detail, and high stress areas. The mesh acts like a spider web in that from each node, there extends a mesh element to each of the adjacent nodes. This web of vectors is what carries the material properties to the object, creating many elements.

PROCEDURE:-1. Sketch the closed figure shown below, dimension it.2. Extrude the wireframe using the value of 40mm (say).3. Name the part.4. Create a finite element (FE) model to associate with the part. 5. Change the task to Boundary Conditions6. Apply boundary conditions, fully restrain the rear vertical face and apply the pressure of 500 N/mm2 on the top surface.7. Change the task to Meshing 8. Mesh the whole volume by using the parabolic tetrahedral elements. with the element length of 20.

9. Generate the solid mesh10. Create a solution set(accepting all defaults) and solve the model using linear statics for deflection and stress and solve the FE model.11. Create the display form to see displacement and stress results on the deformed geometry.

RESULT: FEA has become a solution to the task of predicting failure due to unknown stresses by showing problem areas in a material and allowing designers to see all of the theoretical stresses within. The displayed FE model.