COMPUTER AIDED ENGINEERING. Part-1

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1 COMPUTER AIDED ENGINEERING Course no Finite Element Modelling and Simulation Finite Element Modelling and Simulation Part-1

2 Modeling & Simulation System A system exists and operates in time and space. Model Simplified representation of the actual system Promotes understanding of the real system.

3 Modeling & Simulation (contd.) Simulation Computerized version of the model which is run over time to study the implications of the defined interactions. One develops a model simulates it learns from the One develops a model, simulates it, learns from the simulation, revises the model, and continues the iterations until an adequate level of understanding is developed.

4 Simplified Representation of System Dimensional Simplification 1-D Model 2-D Model 3-D Model Symmetric Simplification Non-symmetric Model Axisymmetric Model Quarter Symmetric Model

5 Simplified Representation of System (contd.) Condition of Dimensional simplification Plane stress problem Plane strain problem Plane stress with thickness problem Condition of Symmetry Geometric symmetry Symmetric displacement constraint Traction boundary condition

6 Example

7 What are the details needed to do a Finite Element Analysis? Geometry of fthe component or structure t The geometry is generated Shape Size (Dimensions) Material out of which the structure is made Boundary Conditions Loads acting on the structure Expectations from the problem (How do you expect the structure to respond from the description of the above details?) - This would help you in deciding the type of analysis required, select the element and also check the results of the analysis by modelling. Shape and Size are the two basic parameters that define the geometry of the structure.

8 Finite Element Analysis of Model Create Geometry of Model Dfi Define Element Type Define Material Properties Define Geometric Properties Assign the Appropriate Properties to the Exact Area

9 Finite Element Analysis of Model (contd.) Apply Boundary Conditions Apply Loads Dividing the Model into Number of Elements Meshing (Connectivity of elements) Solution Post-Processing g( (Analysis of the Result from Simulation)

10 FEA Process Map Criteria for Element Selection Pre-Processing Physical Problem Decide on type of Analysis Required Element Selection Geometric Modelling Meshing Define Material Prop. Structural/Thermal etc Material Behaviour 1-D/2-D/3-D Analysis Reqd. DOF to analyze the Expected behaviour Symmetry Considerations Applying Loads and Boundary Conditions Solution Viewing Results / Post-Processing

11 Element Type The common element types are as below Line or Spar Elements Beam Elements Plane Elements Shell Elements Solid Elements The elements are classified dbased on the physical lbehaviour they are bound to represent, type of analysis (structural, thermal, coupled field etc), material property, whether they need to be modeled over a line or area or volume model etc.

12 Define Material Properties Modulus of Elasticity Poisson Ratio Strain Rate Stress-strain curve Yield strength

13 Define Geometric Properties Cross-sectional Area Thickness Moment of inertiai

14 Boundary Conditions Boundary conditions are needed to: Restrain the model so that rigid body motion does not occur. Constraints t depends d on degrees of ffreedom. Examples of types of constraints are: Displacement: ux, uy, uz (translation along X, Y, Z) Rotation: rotx, roty, rotz (rotation with respect to X, Y, Z) Symmetric Boundary Condition Successful analysis depends on how closely users approximate reality in geometry, material behavior, loads, and boundary conditions.

15 Meshing Meshing is the process of discretizing the domain with the selected elements The successful analysis has a greater dependence on The successful analysis has a greater dependence on the quality of the mesh.

16 Meshing (contd.) The general meshing guidelines are: Use coarse mesh on the first run and then refine it on subsequent runs to check the variation of the result with increase in mesh density. Making a finer mesh increases the number of nodes and elements and hence the computational time. Use fine mesh in the primary areas of interest and in the Use fine mesh in the primary areas of interest and in the regions of high field gradient (areas of stress concentration, areas where there is abrupt change in geometry etc.)

17 Meshing (contd.) Poor Good

18 Post-Processing Contour Plots List of data for further analysis Nodal data Element data

19 Displacement Feature (contour plot)

20 Stress Feature (contour plot)

21 COSMOS COSMOS Works is a design analysis automation application fully integrated with Solid Works. This software uses the Finite Element Method (FEM) to simulate the working conditions of your designs and predict their behaviour. FEM requires the solution of large systems of equations. Powered by fast solvers, COSMOS Works makes it possible for designers to quickly check the integrity of their designs and search for the optimum solution.

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