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Influence of the Heterogeneity of the Core Material on the Local Instability of a Sandwich Panel


[ 1 ] Instytut Analizy Konstrukcji, Wydział Inżynierii Lądowej i Transportu, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.7] Civil engineering and transport

Year of publication


Published in


Journal year: 2022 | Journal volume: vol. 15 | Journal number: iss. 19

Article type

scientific article

Publication language


  • sandwich panels
  • local instability
  • wrinkling
  • heterogeneous core
  • strain energy

EN The problem of local instability in the compressed facing of a sandwich panel is considered in the paper. The case of a facing resting on an infinite core is examined, but the validity of such a simplification has been discussed in detail. An energy approach is used to solve the problem. The general procedure for considering the influence of the core parameter variability on the value of stress causing the facing instability is presented. Expressions allowing us to calculate the wrinkling stress were derived, which was the main aim of the research. The heterogeneity of the core material is taken into account by using continuous functions describing the variability of the core material parameters. In the examples illustrating the theory, the exponential and polynomial functions were used. The examples are based on the actually measured elastic modules of the core. The presented considerations were extended to the analysis of strain energies, which confirmed that the properties of the layer adjacent to the facing (up to 2 cm thick) determine the value of the wrinkling stress. The paper presents an example of the optimization of core material parameters in which a change in the distribution of the core parameters led to an approximately threefold increase in the wrinkling strength of the sandwich panel.

Date of online publication


Pages (from - to)

6687-1 - 6687-12





Article Number: 6687

License type

CC BY (attribution alone)

Open Access Mode

open journal

Open Access Text Version

original author's version

Date of Open Access to the publication

at the time of publication

Ministry points / journal


Impact Factor


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