Experimental and Numerical Analysis of Composite Folded Sandwich Core Structures Under Compression |
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Authors: | S Heimbs P Middendorf S Kilchert A F Johnson M Maier |
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Affiliation: | (1) EADS Innovation Works, 81663 Munich, Germany;(2) German Aerospace Center (DLR), Institute of Structures and Design, 70569 Stuttgart, Germany;(3) Institute for Composite Materials (IVW), Kaiserslautern University of Technology, 67663 Kaiserslautern, Germany |
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Abstract: | The characterisation of the mechanical behaviour of folded core structures for advanced sandwich composites under flatwise
compression load using a virtual testing approach is presented. In this context dynamic compression test simulations with
the explicit solvers PAM-CRASH and LS-DYNA are compared to experimental data of two different folded core structures made
of aramid paper and carbon fibre-reinforced plastic (CFRP). The focus of the investigations is the constitutive modelling
of the cell wall material, the consideration of imperfections and the representation of cell wall buckling, folding or crushing
phenomena. The consistency of the numerical results shows that this can be a promising and efficient approach for the determination
of the effective mechanical properties and a cell geometry optimisation of folded core structures. |
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Keywords: | Folded core Sandwich structures Compression testing Numerical simulation |
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