By J. N. Reddy

ISBN-10: 019852529X

ISBN-13: 9780198525295

Reddy (mechanical engineering, Texas A&M U.) writes for graduate scholars in engineering and utilized arithmetic, or for these training in such fields as aerospace or the car industries. He works in the course of the finite aspect technique after which applies it to such occasions as warmth move in a single and dimensions, nonlinear bending of heterosexual beams and elastic plates, and flows of viscous incompressible fluids. From there he strikes to nonlinear research of time-dependent difficulties after which to finite aspect formulations of strong continua. The appendices describe resolution techniques for liner and non-linear algebraic equations. Reddy offers workouts and references for basic themes.

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Extra resources for An Introduction to Nonlinear Finite Element Analysis

Example text

Z m }, and that Cn is decomposed into the orthogonal sum Z and Y where a basis for Y is given by {y 1 , y 2 , . . , y n−m }. Since a is constrained to be orthogonal to the subspace Z it has to be in Y so that the vector a ∈ Y can be expressed as a = W c where W is an n × (n − m) matrix whose columns are the y i and c is an (n − m)-vector. 33) becomes (c, W ∗ C W c) . 34) Maximize (c, W ∗ B W c) As a practical matter for finding a basis for the subspace Y , we can apply a Householder transformation to the matrix U whose columns are formed by the vectors z j .

If f ∈ C p [a, b] then g is 2π−periodic and p−times continuously differentiable with g (j) (0) = g (j) (2π) = 0 , j = 1, . . , p − 2 . e. 82) j=0 π where tj = j N , j = 0, . . , 2N − 1. This quadrature formula has nodes w(tj ) π and weights N w (tj ). 17 yields the error estimate I(f ) − QN (f ) ≤ 2π c N p−2 0 dp−2 (f ◦ w)(t) dt . 83) There exist many examples for substitutions s = w(t). In the following numerical experiments we have chosen wp (t) = a + tp tp (b − a) , + (2π − t)p t ∈ [0, 2π] , for p = 3, 5, 7.

Then the maximum value for R is the largest eigenvalue µ of the generalized eigenvalue problem: C v = µBv. 32) We should mention that some authors suggest that, since the matrix B is positive definite and hence invertible, the optimal quantities can be expressed in terms of the usual eigenvalue problem for the matrix B −1 C. However, it is well known (see [144]), that computation directly with the generalized eigenvalue problem using, for example, the QZ algorithm is in general more stable and leads to more accurate results.

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An Introduction to Nonlinear Finite Element Analysis by J. N. Reddy


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