Read e-book online A New Boundary Element Formulation in Engineering PDF

By Tania G.B. DeFigueiredo

ISBN-10: 354054030X

ISBN-13: 9783540540304

ISBN-10: 3642845045

ISBN-13: 9783642845048

1. 1 The Hybrid Displacement Boundary aspect version This paintings is anxious with the derivation of a numerical version for the answer of boundary-value difficulties in capability idea and linear elasticity. it truly is thought of a boundary aspect version as the ultimate vital equation comprises a few boundary integrals, whose review calls for a boundary discretization. in addition, the entire unknowns are boundary vari­ ables. The version is totally new; it differs from the classical boundary aspect formula ·in how it is generated and for that reason within the fi­ nal equations. A generalized variational precept is used as a foundation for its derivation, while the normal boundary point formula relies on Green's formulation (potential difficulties) and on Somigliana's id (elas­ ticity), or on the other hand throughout the weighted residual method. 2 The multi-field variational precept which generates the formula in­ volves 3 autonomous variables. For strength difficulties, those are the capability within the area and the aptitude and its general spinoff at the boundary. when it comes to elasticity, those variables are displacements within the area and displacements and tractions at the boundary. as a result, by means of analogy with the assumed displacement hybrid finite aspect version, ini­ tially proposed through Tong [1] in 1970, it may be known as a hybrid displacement version. the ultimate procedure of equations to be solved is identical to that present in a stiffness formula. The stiffness matrix for this version is symmetric and will be evaluated through in basic terms appearing integrations alongside the boundary.

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N) are respectively the potential and the normal flux at a boundary node i. N is the number of boundary nodes considered. Notice that the vectors U and q represent, respectively, the nodal values of potential and fluxes on the boundary although, for simplicity, the tilde has been ommited from the notation. 2) are applied. 46). As mentioned before, the functions u*i are singular at the boundary nodes i. To avoid introducing singular functions into the variational func- 34 tional, these singularities are excluded from the domain under consideration.

E. 7: The boundary f .. 19) gives I .. 26) In this case, the limit of the integral is the integral of the limit and by performing the integral one has a final value for I .. , as shown below: I .. 27) where Rij is the distance between points i and j. Case 4: Integration over an element which includes both points i and j. This situation occurs when evaluating the main diagonal terms of F, namely hi. 11), i. e. Iii = lim f . 28) 56 Direct computation of this integral is not possible and physical considerations will then be applied to compute the main diagonal of the matrix F.

4. The original domain 0 can be recovered from 0' by taking the limit when the spheres' radius tends to zero, i. e. when e ---+ 0 then 0' f', f~ ---+ 0, f' ---+ f, f'q ---+. 4). 58). The functional is then written in matrix notation as where q* is the vector of fundamental fluxes associated with the vector of fundamental solutions u*. 13). The domain n and the infinite domain noo have the same properties, and consequently, the same mass density p. 58) vanishes in consequence of the kind of approximation used for the potential in the domain.

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A New Boundary Element Formulation in Engineering by Tania G.B. DeFigueiredo

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