Discrete modeling of the crushing of nomex honeycomb core and application to impact and post-impact behavior of sandwich structures
In this chapter, an original method for modeling the behavior of sandwich structures during and after impact is proposed and validated. It is based on the demonstration that Nomex honeycomb behaves in a post-buckling mode very early and that compression forces are taken up by the corners or verti...
| Main Authors: | , , , |
|---|---|
| Format: | Book Chapter |
| Language: | English |
| Published: |
Springer Science+Business Media Dordrecht
2012
|
| Subjects: | |
| Online Access: | http://irep.iium.edu.my/34929/ http://irep.iium.edu.my/34929/ http://irep.iium.edu.my/34929/ http://irep.iium.edu.my/34929/1/final_article__springer_chpater_book.pdf |
| Summary: | In this chapter, an original method for modeling the behavior of sandwich
structures during and after impact is proposed and validated. It is based on the
demonstration that Nomex honeycomb behaves in a post-buckling mode very
early and that compression forces are taken up by the corners or vertical edges
of the honeycomb cells in the same way as they are in the stiffeners in aircraft
structures. Thus it is possible to represent the honeycomb discretely by a grid of
springs located at the six corners of hexagonal cells. This approach represents the
phenomenon of indentation on honeycomb alone or on sandwiches very well. This approach provides an understanding of how the sandwich and the core behave under compression after impact. An original criterion based on a local core crush is tested and validated to compute the residual strength. To consider the bending response of sandwich structures, a multi-level approach is also proposed. |
|---|