Finite Element Concepts
Finite Element Concepts
This text presents a highly original treatment of the fundamentals of FEM, developed using computer algebra,based on undergraduate-level engineering mathematics and the mechanics of solids. The book is divided into two distinct parts of nine chapters and seven appendices. The first chapter reviews the energy concepts in structural mechanics with bar problems, which is continuedin the next chapter for truss analysis usingMathematicaprograms.The Courant and Clough triangular elements for scalar potentials and linear elasticity are covered in chapters three and four, followed byfour-node elements. Chapters five and six describe Taigs isoparametric interpolants and Irons patch test. Rayleigh vector modes, which satisfy point-wise equilibrium, are elaborated on in chapter seven along with successful patch tests in the physical (x,y) Cartesian frame.Chapter eight explains point-wise incompressibility and employs (Moore-Penrose) inversion of rectangular matrices. The finalchapter analyzes patch-testsin all directions and introduces five-node elements for linear stresses. Curved boundaries and higher order stresses are addressed inclosed algebraic form.Appendices give a short introduction toMathematica, followed bytruss analysis using symbolic codes that could be used in all FEM problems to assemble element matrices and solve for all unknowns. AllMathematicacodes for theoretical formulations and graphics are included with extensive numerical examples.
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