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Engineering - Mechanical Engineering | MATLAB Codes for Finite Element Analysis - Solids and Structures

MATLAB Codes for Finite Element Analysis

Solids and Structures

Ferreira, A. J. M.

2009, IX, 235 p.

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This book illustrates how MATLAB compact and powerful programming framework can be very useful in the finite element analysis of solids and structures. The book shortly introduces finite element concepts and an extensive list of MATLAB codes for readers to use and modify. The book areas range from very simple springs and bars to more complex beams and plates in static bending, free vibrations and buckling problems.

Content Level » Research

Keywords » Buckling - Finite Element Analysis - MATLAB - Solids - Structures - Vibrations - programming - vibration

Related subjects » Computational Intelligence and Complexity - Mechanical Engineering - Mechanics

Table of contents 

1 Short introduction to MATLAB . 1 1.1 Introduction . . . . . . . . 1 1.2 Matrices . 1 1.3 Operating with matrices . . . . . . . . 2 1.4 Statements . . . . . . . . . 3 1.5 Matrix functions . . . . 3 1.6 Conditionals, if and switch. . . . . . 4 1.7 Loops: for and while . 5 1.8 Relations . 6 1.9 Scalar functions . . . . . 7 1.10 Vector functions . . . . . 8 1.11 Matrix functions . . . . 9 1.12 Submatrix 10 1.13 Logical indexing . . . . . 12 1.14 M-files, scripts and functions . . . . 13 1.15 Graphics . 14 1.15.1 2D plots . . . . . 14 1.15.2 3D plots . . . . . 16 1.16 Linear Algebra . . . . . . 16 2 Discrete systems . . . . . . . 21 2.1 Introduction . . . . . . . . 21 2.2 Springs and bars . . . . 21 2.3 Equilibrium at nodes . 22 2.4 Some basic steps . . . . 23 2.5 First problem and first MATLAB code . . . . . 23 2.6 New code using MATLAB structures . . . . . . . 30 3 Analysis of bars . . . . . . . 35 3.1 A bar element . . . . . . . 35 3.2 Numerical integration 39 3.3 An example of isoparametric bar 40 3.4 Problem 2, using MATLAB struct . . . . . . . . . 43 3.5 Problem 3 47 4 Analysis of 2D trusses . 53 4.1 Introduction . . . . . . . . 53 4.2 2D trusses 53 4.3 Stiffness matrix . . . . . 54 4.4 Stresses at the element . . . . . . . . . 55 4.5 First 2D truss problem . . . . . . . . . 55 4.6 A second truss problem . . . . . . . . 61 4.7 An example of 2D truss with spring . . . . . . . . 66 5 Trusses in 3D space . . . . 71 5.1 Basic formulation . . . . 71 5.2 A 3D truss problem. . 72 5.3 A second 3D truss example . . . . . 75 6 Bernoulli Beams . . . . . . . 81 6.1 Introduction . . . . . . . . 81 6.2 Bernoulli beam problem . . . . . . . . 83 6.3 Bernoulli beam with spring . . . . . 88 7 2D frames . . . 7.1 An example of 2D frame . . . . . . . 93 7.2 An example of 2D frame . . . . . . . 97 8 Analysis of 3D frames . 107 8.1 Introduction . . . . . . . . 107 8.2 Stiffness matrix and vector of equivalent nodal forces . . . 107 8.3 First 3D frame example . . . . . . . . 108 8.4 Second 3D frame example . . . . . . 113 9 Analysis of grids . . . . . . . 117 9.1 Introduction . . . . . . . . 117 9.2 A first grid example . 120 9.3 A second grid example . . . . . . . . . 123 10 Analysis of Timoshenko beams . . 127 10.1 Introduction . . . . . . . . 127 10.2 Formulation for static analysis . . 127 10.3 Free vibrations of Timoshenko beams . . . . . . 134 10.4 Buckling analysis of Timoshenko beams . . . . 142 11 Plane stress . 11.1 Introduction . . . . . . . . 149 11.2 Displacements, strains and stresses . . . . . . . . 150 11.3 Boundary conditions . 150 11.4 Potential energy . . . . . 151 11.5 Finite element discretization . . . . 151 11.6 Interpolation of displacements . . . 151 11.7 Element energy . . . . . 152 11.8 Quadrilateral element Q4 . . . . . . . 153 11.9 Example: plate in traction . . . . . . 156 11.10Example: Beam in bending . . . . . 159 12 Analysis of Mindlin plates . . . . . . . 169 12.1 Introduction . . . . . . . . 169 12.2 The Mindlin plate theory . . . . . . . 169 12.2.1 Strains . . . . . . . 170 12.2.2 Stresses . . . . . . 171 12.3 Finite element discretization . . . . 172 12.4 Example: a square Mindlin plate in bending 173 12.5 Free vibrations of Mindlin plates 190 12.6

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