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Description
The subject of this article are sandwich panels commonly used as building envelope elements. Typical sandwich panels are three-layer elements consisting of thin but rigid facings and a thick but shear-deformable core. The produced panels are subjected to systematic strength tests, on the basis of which the parameters used in the design of the panels are determined. The produced panels differ in many geometric and technological parameters. They have different thickness, width, thickness of the facings. The profiling of these facings is also different. Moreover, the same values are determined in tests that differ in the static scheme of loading and supporting the elements. Despite this, the panels are usually grouped into so-called families, for which representative strength parameters are determined. Grouping panels into families aims to reduce the costs of strength tests on the one hand, and to simplify the data used in the design process on the other.
The aim of this article is to statistically approach the problem of the influence of geometric and technological factors on specific strength parameters of sandwich panels. From the manufacturer's point of view, knowledge of the significance of a given production parameter on the strength of a sandwich panel can be very important in the context of minimizing costs or maximizing the load-bearing capacity of the panels. The basic strength parameter that determines the scope of the panel's application is the wrinkling stress. This results from the fact that most panels are damaged in the span or on the support due to the wrinkling of the steel facing, which is compressed. Therefore, the results of several years of laboratory tests performed for different panel thicknesses, facing thicknesses, profiling types, core densities and manufacturers were used. The statistical analysis of the results confirmed a significant relationship between the profiling type and wrinkling stress, but also showed that the results of some types of tests should not be combined to create a family. The conclusions resulting from the analyses are of both cognitive and practical nature.
The scientific activity of the Institute of Mathematics, Poznan University of Technology was funded under grant no. 0213/SBAD/0122.
