Scaling of Energy Absorption in Composites to Enhance Survivability
Technical rept. 1 Jun 2004-31 May 2006
NORTHWESTERN UNIV EVANSTON IL
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The objective of this paper is to study the size effect on the nominal strength of imperfect sandwich structures for buckling driven delamination, to quantify this size effect, and to determine its intensity. A secondary objective is to assess the size effect on the postpeak energy absorption, important for judging survival under blast or dynamic impact. Buckling driven delamination is difficult to control in experiments. Thus, the present study relies on numerical simulations using geometrically nonlinear finite element analysis as well as the softening foundation model, which is an adaptation of Winkler elastic foundation. Delamination fracture is modeled by a cohesive crack model. Dimensionless variables are used to cover the entire practical range.
- Laminates and Composite Materials
- Numerical Mathematics
- Structural Engineering and Building Technology