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Numerical simulations of delamination in FRP shell structures using XFEM

Numerical simulations of delamination in FRP shell structures using XFEM

Leitung:  Prof. Wilhelm J.H. Rust, Prof. P. Wriggers
E-Mail:  yazdani@ikm.uni-hannover.de
Team:  Saleh Yazdani
Jahr:  2013

When using Fiber Reinforced Plastics (FRP) delamination can occur leading to significant reduction of the load carrying capacity of a structure. Here the focus is on structural stability (buckling and snap-through). Furthermore, the propagation of delamination in pre- and postbuckling regime is of interest. A standard model for such simulations consists either of two shell elements with nodes at a given location of delamination or of a stack of shell-like solids, one per layer. The former has limits in its application while the latter leads to enormous computational effort. In this project eXtended FEM is applied to structural delamination problems. This allows the description of delamination at arbitrary through-the-thickness locations by means of shape functions enriched for discontinuities. Criteria for starting and propagating delamination should be integrated, if applicable combined with cohesive zone models. Contact in a delaminated zone must be accounted for. The new element must be suitable for large rotations and buckling.