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Structural Engineering and Mechanics Volume 12, Number 4, October 2001 , pages 363-376 DOI: https://doi.org/10.12989/sem.2001.12.4.363 |
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A General approach to the wrinkling instability of sandwich plates |
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Walter K. Vonach and Franz G. Rammerstorfer(Austria)
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| Abstract | ||
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Sandwich plates are widely used in lightweight design due to their high strength and stiffness to weight ratio. Due to the heterogeneous structure of sandwich plates, they can exhibit local instabilities (wrinkling), which lead to a sudden loss of stiffness in the structure. This paper presents an analytical solution to the wrinkling problem of sandwich plates. The solution is based on the Rayleigh-Ritz method, by assuming an appropriate deformation field. In contrast to the other approaches up to now, this model takes arbitrary and different orthotropic face layers, finite core thickness and orthotropic core material into account. This approach is the first to cover the wrinkling of unsymmetric sandwiches and sandwiches composed of orthotropic FRP face layers, which are most common in advanced lightweight design. Despite the generality of the solution, the computational effort is kept within bounds. The results have been verified using other analytical solutions and unit cell 3D FE calculations. | ||
| Key Words | ||
| sandwich; instability; wrinkling; elastic foundation; shell; plate; buckling; orthotropy. | ||
| Address | ||
| Walter K. Vonach and Franz G. Rammerstorfer, Institute of Lightweight Structures and Aerospace Engineering, Vienna University of Technology, Gusshausstrasse 27-29, A-1040 Wien, Austria | ||