Read e-book online Computational engineering. Introduction to Numerical Methods PDF

By Michael Schäfer

ISBN-10: 3540306854

ISBN-13: 9783540306856

This publication is an creation to fashionable numerical tools in engineering. It covers functions in fluid mechanics, structural mechanics, and warmth move because the such a lot proper fields for engineering disciplines similar to computational engineering, medical computing, mechanical engineering in addition to chemical and civil engineering. The content material covers all facets within the interdisciplinary box that are crucial for an ''up-to-date'' engineer.

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48) + ρf2 = 0 . 49) The displacement boundary conditions are u1 = ub1 and u2 = ub2 on Γ1 , whereas the stress boundary conditions on Γ2 read E ∂u1 ∂u1 ∂u2 E ∂u2 n1 + +ν + 2 1−ν ∂x1 ∂x2 2(1 + ν) ∂x2 ∂x1 ∂u1 ∂u1 ∂u2 E ∂u2 E n1 + ν + − 2(1 + ν) ∂x2 ∂x1 1 − ν2 ∂x1 ∂x2 n2 = tb1 , n2 = tb2 . 4 Structural Mechanics Problems 37 spatial dimensions (see Fig. 12). In this case one speaks of problems with plane strain state. Again, the displacements, strains, and stresses only depend on two spatial directions (again denoted by x1 and x2 ).

A = A(x1 ) is the cross-sectional area of the beam. 42) where B = EI x23 dx2 dx3 with I = A is the flexural stiffness of the beam. I is called axial geometric moment of inertia. In the case of a rectangular cross-section with width b and height h, for instance, one has h/2 b/2 x23 dx2 dx3 = I= 1 bh3 . 42) the following differential equation for the unknown deflection w = w(x) of the beam results: (Bw ) + fq = 0 . 43) is an ordinary differential equation of fourth order. This also has consequences with respect to the boundary conditions that have to be prescribed.

The normal stress in x3 -direction T33 does not necessarily vanish in this case. The essential difference from a disk in plane stress state is the different strainstress relation. 28) must be used. 49) results. The deformation of a thin plate, which is subjected to a vertical load (see Fig. 13), can under certain conditions also be formulated as a twodimensional problem. The corresponding assumptions are known as Kirchhoff hypotheses: the plate thickness is small compared to the dimensions in the other two spatial directions, the vertical deflection u3 of the midplane and its derivatives are small, the normals to the midplane remain straight and normal to the midplane during the deformation, the stresses normal to the midplane are negligible.

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Computational engineering. Introduction to Numerical Methods by Michael Schäfer


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