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A platform for research: civil engineering, architecture and urbanism
A general solution to the wrinkling problem of sandwiches
Within this work, a very general algorithm is derived which allows to calculate the critical loads leading to wrinkling failure for unsymmetric and orthotropic sandwich plates which are far out of scope of the wrinkling models currently used, but widely used in industry. The corresponding efects of unsymmetry and orthotropy are examined in a number of examples and show the need for taking these effects properly into account. Comparisons with the common existing wrinkling models show the shortcoming of these models even in the simplest case of a symmetric sandwich beam under compression. It is demonstrated, that the type of core material used (foam, honeycomb) is of high and unexpected influence on the wrinkling behavior, and the guidelines given in the standard literature on sandwich construction may lead to a severe overestimation of he critical load. Different Finite Element models have been built up for verification purpuses, among them also FE unit cell models which proved to be very advantageous in the case of periodic buckling patterns.
A general solution to the wrinkling problem of sandwiches
Within this work, a very general algorithm is derived which allows to calculate the critical loads leading to wrinkling failure for unsymmetric and orthotropic sandwich plates which are far out of scope of the wrinkling models currently used, but widely used in industry. The corresponding efects of unsymmetry and orthotropy are examined in a number of examples and show the need for taking these effects properly into account. Comparisons with the common existing wrinkling models show the shortcoming of these models even in the simplest case of a symmetric sandwich beam under compression. It is demonstrated, that the type of core material used (foam, honeycomb) is of high and unexpected influence on the wrinkling behavior, and the guidelines given in the standard literature on sandwich construction may lead to a severe overestimation of he critical load. Different Finite Element models have been built up for verification purpuses, among them also FE unit cell models which proved to be very advantageous in the case of periodic buckling patterns.
A general solution to the wrinkling problem of sandwiches
Vonach, W.K. (author)
2001
98 Seiten, 44 Bilder, 43 Quellen
Theses
English
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