工程有限元分析（簡體書）

This textbook presents the necessary concepts， principles and general procedure of Finite Element Method （FEM） which are primarily applied for linearly elastic structural analysis including plane problems， axisymmetric problems， space problems， plates and shells and fracture mechanics. The FEM of heat transfer in brief is also incorporated. Some straightforward examples are introduced to demonstrate a complete and detailed finite element procedure. The aim of the text is to provide the fundamental theories and numerical methodology in finite element analysis. It focuses on the derivation of key governing equations of the FEM and its engineering application.
This text can be regarded as a text or reference book for the university under- and post-graduate students or engineers whose majors are related to mechanics， aerospace， mechanical and civil engineering， heat transfer and so on.

《工程有限元分析(英文版)》由北京航空航天大學出版社出版。

Chapter 1 Introduction to Finite Element Method
1.1 Basic Concept of Finite Element Method
1.2 General Description of Finite Element Method
1.2.1 Finite Element Technique in Structure Analysis
1.2.2 Finite Element Technique in Heat Conduction
1.2.3 Summary
1.3 Engineering Applications of Finite Element Analysis
1.4 Principle of Virtual Displacements and Variational Approach
1.4.1 Principle of Virtual Displacements （PVD）
1.4.2 Variational Formulation
Problem Set 1

Chapter 2 General Procedure of Finite Element Method
2.1 Interpolation Functions
2.2 Strain-displacement Relations
2.3 Stress-strain Relations （Constitutive Relations）
2.4 Governing Equations in Finite Element Analysis
2.5 Stiffness Matrices
2.5.1 Element Stiffness Matrix
2.5.2 Global Stiffness Matrix
2.6 Equivalent Nodal Force Vectors
2.6.1 Element Equivalent Nodal Force Vector
2.6.2 Global Equivalent Nodal Force Vector
2.7 Imposition of Boundary Condition
2.8 Numerical Examples
2.9 Area Coordinates
2.10 Six-node Triangular Elements
2.11 Linear Rectangular Elements
Problem Set 2

Chapter 3 Formulation of Isoparametric Finite Element Matrices
3.1 Isoparametric Concepts
3.2 Construction of Interpolation Functions
3.2.1 The Pascal Triangle
3.2.2 Lagrange Polynomials
3.2.3 Lagrange Polynomials in Dimensionless Form
3.3 Family of Two-dimensional Isoparametric Elements
3.4 Formulation of Isoparametric Finite Element Matrices for Plane Elasticity
3.4.1 Interpolation Functions
3.4.2 Strain-displacement Transformation Matrix
3.4.3 Constitutive Relations
3.4.4 Element Stiffness Matrix
3.4.5 Element Load Vector
3.5 Isoparametric Triangular Elements in Terms of Area Coordinates
Problem Set 3

Chapter 4 Stress Analysis of Axisymmetric Problems
4.1 Interpolation Functions
4.2 Strain-displacement Relations
4.3 Stress-strain Relations
4.4 Element Stiffness Matrix
4.5 Element Equivalent Nodal Force Vector
4.6 Four-node Rectangular Ring Element
4.7 A Numerical Example
Problem Set 4

Chapter 5 Analysis of Three-dimensional Problems
5.1 Convergence Considerations
5.2 Shape Functions for Three-dimensional Elements
5.2.1 Shape Functions for Tetrahedron Elements
5.2.2 Shape Functions for Three-dimensional Hexahedral Elements
5.3 Formulation of Three-dimensional Isoparametric Element Matrices
5.3.1 Interpolation Functions
……
Chapter 6 Finite Element Analysis for Plates and Shells
Chapter 7 Finite Element Analysis in Fracture Mechanics
Chapter 8 Heat Transfer
References

(3) Nodal Coordinates and Nodal Fixity
The variable MAXNOD controls the input for all nodal coordinates, which are required for the computation of stiffness, stress and load matrices.
The variable MAXFIX indicates the number of nodes with constraints. Such constraints are necessary to eliminate the rigid-body movement which are associated with the element stiffness matrix as well as the stiffness matrix of the whole structure. It is well known that for a plane problem at least three independent displacement components must be constrained.
The nodal fixity is indicated by a two digit fixity code. A digit set to zero indicates that the associated displacement is free to move while for the case of a digit set to unity the associated displacement is constrained.
Due to symmetry, nodes 1,4 and 3,6 of the sample problem are not allowed to move in the x and y directions respectively. The corresponding data input is therefore as shown in Tab. 2.2.
(4) Element Properties
Before element stiffness can be calculated element material properties must be available. For more advanced programs it is usual to allow the material properties and elemenl thickness to vary from one element to the next and also to allow anisotropic material properties for each element.