PSI - Issue 64

Maciej Kulpa et al. / Procedia Structural Integrity 64 (2024) 1673–1680 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 2. FRP composite panels: a) cross-section with general dimensions; b) detailed dimensions of the panel components

The FRP composite structure was designed using a finite element model developed within the SOFiSTiK software (Fig. 3). Laminates and ribs were modelled with 4-node Timoshenko-Reissner shell finite elements with bilinear shape functions with enrichment of the deformation state eliminating the locking effect and taking into account the first-order shear effect. The shell elements were given a specified thickness and layout for each layer of the laminates. The properties of the layer composite material were taken from material tests. The global material parameters for each laminate were then determined on the basis of the classical lamination theory and the lamina sequences. The influence of the panel filling material (core foam) has been conservatively omitted from the calculation. After completing the material and geometry definition, the numerical model was loaded according to the Eurocode loading scheme (5 kN/m 2 ) and the limit states of particular FRP components were checked by the pre standard EuCIA (2019).

Fig. 3. Example of FEM model deformation under a load of 5 kN/m 2