2 Finite Element Method (ENGC 6321) Syllabus Second Semester
3 Objectives Understand the basic theory of the FEM Know the behaviour and usage of each type of elements covered in this course one dimensional (line elements) and two dimensional (planar elements) Have some hand on experiences in solving various simple engineering problems by FEM Interpret and evaluate the quality of the results
4 Chapter Topic 1, Appendix A Introduction Development of Truss, Beam, Grid and Plane Frame Equations Computer programs for truss beam and frame elements (using Matlab) Review of the Basic Theory in 2-D Elasticity. Development of Plane Stress and Plane Strain Stiffness Equations Practical Considerations in Modeling; Computer Program for Plane Stress/Strain Analysis Development of the Linear-Stain Triangle Equations Axisymmetric Elements Isoparametric Formulation
5 Grading Homework and Projects 25% Midterm Exam 25% Final Exam 50%
6 Text book A First Course in the Finite Element Method, Fourth Edition (2007) by Daryl L. Logan. Reference Any Finite Element Book Finite Element Procedures, K. J. Bathe, Prentice Hall First Course in Finite Elements, J. Fish and T. Belytschko
7 What is Finite Element Method (FEM) It is a numerical method for solving problems of engineering and mathematical physics. It is based on the idea of dividing a complicated object into small and manageable pieces Brief history Introduction The modern development of the finite element method began in the 1940s in the field of structural engineering. From the early 1940s to the present, enormous advances have been made in the application of the FEM to solve complicated engineering problems. At present FEM/FEA is the most widely applied computer simulation method in engineering
8 Introduction Applications of FEM in Engineering Mechanical/Aerospace/Automobile Engineering Structure Analysis (static/dynamic, linear/nonlinear) Thermal/Fluid flows Electromagnetics Geo-Mechanics Bio-Mechanics
9 Advantages of the Finite Element Method Handle general loading conditions. Model bodies composed of several different materials (because the element equations are evaluated individually). Handle unlimited numbers and kinds of boundary conditions. Vary the size of the elements to make it possible to use small elements where necessary Change the finite element model easily and cheaply Include dynamic effects Handle nonlinear behavior existing with large deformations and nonlinear materials.
10 Introduction Computer Implementations Pre-Processing (build FE model, loads and constraints) FEA solver (assemble and solve the system of equations) Post-Processing (sort and display the results) Available Commercial FEM Software Packages ANSYS,, ALGOR, ADINA, ABAQUS, SAPPRO, ROBOT
11 Suspension Bridge
12 San Francisco Oakland Bay Bridge Before the 1989 Loma Prieta earthquake
13 San Francisco Oakland Bay Bridge After the earthquake
14 San Francisco Oakland Bay Bridge A finite element model to analyze the bridge under seismic loads Courtesy: ADINA R&D
16 Curved Beam
17 Picnic Table
18 Drag Force Analysis of Aircraft
19 Crush Analysis of Ford Windstar Question What is the load-deformation relation? Solve Partial Differential Equations of Continuum Mechanics Recent Developments Meshless Methods, Iterative methods, Automatic Error Control
20 Radiation Therapy of Lung Cancer
21 Computer Simulation of 9/11 Attack Structural engineers need to know from a scientific perspective what happened to the buildings during the terrorist attacks in order to prevent future failures. The search for answers continues with the help of a state-of-the-art animated visualization created by researchers at Purdue University.
22 Elements and Nodes. Elements and Nodes Finite elements resemble fragments of the structures. Nodes appear on element boundaries and serve as connectors that fasten elements together. All Elements that share a node have the same displacement components at that node. for frame and truss structures, elements and nodes are more or less natural. for elastic continuum, such as a deep beam or a plate /shell structure, such a natural subdivision does not exist and we have to artificially divide the continuum into a number of elements.
23 Elements and Nodes. The finite elements, are usually either triangular or rectangular in shape as shown below: It appears that a FE structure can be produced by sawing the actual structure apart and then pinning it back together at nodes.
24 Engineering design General scenario.. Physical Problem Question regarding the problem...how large are the deformations?...how much is the heat transfer? Mathematical model Governed by differential equations Assumptions regarding Geometry Kinematics Material law Loading Boundary conditions Etc.
25 Engineering design Example: A bracket Physical problem We consider here a simple example of a bracket supporting a vertical load. We need to choose a mathematical model. The choice of this model clearly depends on what phenomena are to be predicted and on the geometry, material properties, loading and support conditions of the bracket.
26 Engineering design Example: A bracket Physical problem Questions: 1. What is the bending moment at section AA? 2. What is the deflection at the pin? Finite Element Procedures, K J Bathe
27 Engineering design We notice that Example: A bracket Physical problem The bracket has been fastened to a very thick steel column. The term very thick is relative to the thickness t and height h of the bracket. We translate this statement into the assumption that that the bracket is fastened to a (practically) rigid column.
28 Engineering design Example: A bracket Physical problem We notice that We also assume that the load is applied very slowly. The condition of time very slowly is relative to the largest natural period of the bracket: i.e., the time span over which the load W is increased from 0 to its full value is much longer than the fundamental period of the bracket. We translate this statement into meaning that we require static analysis (as opposed to a dynamic analysis).
29 Engineering design Example: A bracket Mathematical model 1: beam Moment at section AA M WL Deflection at load How reliable is this model? How effective is this model? 27,500 N cm at load W 1 3 W(L r EI cm N ) 3 W(L r 5 AG 6 N )
30 Engineering design Example: A bracket Mathematical model 2: plane stress Difficult to solve by hand!
31 Engineering design..general scenario.. Physical Problem Mathematical model Governed by differential equations Numerical model e.g., finite element model
32 Engineering design..general scenario.. Finite element analysis PREPROCESSING 1. Create a geometric model 2. Develop the finite element model Solid model Finite element model
33 Engineering design FEM analysis scheme..general scenario.. Finite element analysis Step 1: Divide the problem domain into non overlapping regions ( elements ) connected to each other through special points ( nodes ) Element Node Finite element model
34 Engineering design..general scenario.. Finite element analysis FEM analysis scheme Step 2: Describe the behavior of each element Step 3: Describe the behavior of the entire body by putting together the behavior of each of the elements (this is a process known as assembly )
35 Engineering design..general scenario.. Finite element analysis FEM analysis scheme Step 4: Solve the system of equations involving unknown quantities at the nodes (e.g., displacements) Step 5: Calculate desired quantities (e.g., strains and stresses) at selected elements
36 Engineering design..general scenario.. Finite element analysis POSTPROCESSING Compute moment at section AA
38 Engineering design Example: A bracket Mathematical model 2: plane stress FEM solution to mathematical model 2 (plane stress) Moment at section AA Deflection at load M load 27,500 N cm at W cm Conclusion: With respect to the questions we posed, the beam model is reliable if the required bending moment is to be predicted within 1% and the deflection is to be predicted within 20%. The beam model is also highly effective since it can be solved easily (by hand). What if we asked: what is the maximum stress in the bracket? would the beam model be of any use?
39 Engineering design Example: A bracket Summary 1. The selection of the mathematical model depends on the response to be predicted. 2. The most effective mathematical model is the one that delivers the answers to the questions in reliable manner with least effort. 3. The numerical solution is only as accurate as the mathematical model.
40 Modeling a physical problem Physical Problem Mathematical Model Example:...General A scenario bracket Change physical problem Improve mathematical model Numerical model Does answer make sense? No! Refine analysis YES! Happy Design improvements Structural optimization
41 Modeling a physical problem Verification Example: and A bracket validation Verification Physical Problem Mathematical Model Numerical model Validation
42 General steps of the FEM in Structural Analysis Step 1: Discretize and Select Element Types This step involves dividing the body into an equivalent system of finite elements with associated nodes (lines or surfaces) and choosing the most appropriate element type. Small elements (and possibly higher-order elements) are desirable where results are changing rapidly, such as changes of geometry.
43 Introduction to the Stiffness Method Types of Finite Elements 1-D (Line) Element 2-D (Plane) Element 3-D (Solid) Element
44 General steps of the FEM in Structural Analysis Step 2: Select a Displacement Function Here we chose a displacement function within each element. This function is defined using the nodal values of the element. Linear, quadratic, and cubic polynomials are frequently used functions because they are simple to work with in finite element formulation. However, trigonometric series could also be used.
45 General steps of the FEM in Structural Analysis Step 3: Define the Strain / Displacement and Stress / Strain Relationships These relationships are necessary for deriving the equations for each finite element. For example, in the case of 1-D x du dx,for small strains
46 General steps of the FEM in Structural Analysis Step 3: Define the Strain / Displacement and Stress / Strain Relationships In addition, the stresses must be related to the strains through the stress/strain low (constitutive law). For example, for I-D stress analysis, Hooke s law has the form E x x where stress in the x direction and E = modulus of elasticity.
47 Step 4: Derive the Element Stiffness Matrix and Equations a) Direct Equilibrium Method: b) Work or Energy Methods: c) Methods of Weighted Residuals General steps of the FEM in Structural Analysis n nn n n n n n n n d d d d k k k k k k k k k k k k k k k k f f f f
48 General steps of the FEM in Structural Analysis Step 5: Assemble the Element Equations to Obtain the System (or Total) Equations F K d where, F K d Vector of global nodal forces including applied known loads, Structure global or total stiffness matrix, and Vector of known and unknown structure nodal degrees of freedom.
49 General steps of the FEM in Structural Analysis Step 5: Introduce Boundary Conditions & Solve for the Unknown Displacements (DOF) Step 6: Solve for the Element Strains and Stresses Step 7: Interpret the Results
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