Influence of thestatic stress alternate on the sustainingcapacity and stability of the sandwich elements panels of two flat metal faces and acore of Polyurethane /PUR/


Abstract in English

Sandwich panels are locally produced with two faces of metal those which cover a hard adhesive and thick core of polyurethane. The widely Extend of these panels increase day for day as structural elements imitating the function necessities of the engineering construction. The use of those panels as carried structural elements in wall or ceiling structures can coincide with a submission of their sections materials, especially the two faces to the change in a nature of the normal stress acted on them due to the alternate of the panel part bending statically or dynamically when the alternate was produced from the change of the loading acting direct on it or from the alternate of the live loading on the adjacent fields of the continuous systems from it. The evaluation of the sustain capacity and stability of the sandwich elements consisted of such panels performs depended to the critical stress value leaded to arise of the wrinkling waves of the compressive face of the panel that it values depended first on the quality and properties of the production. The research handled the testing of the sustainability and stability of the local produced sandwich panel due to the alternate in a nature of it stress statically as a carried structural element in the structural system built from such panels. The conclusions of the research showed that this produced panel follows a linear behavior too even in the case of the change of its bending direction or stress nature of its face, especially in the loading steps coincided at least to the arising of the critical wrinkling stress, whereas the value of this stress decreases 40% from its value for the loading or bending case of the panel in only one direction.

References used

Pokharel, Narayan: Docturate Thesis, Behavior and Design of Sandwich Panels Subjected to Local Bucling and Flexural Wrinkling Effects, Queensland University 2003, Australia
Zenkert, D. : An introduction to sandwich construction, Engineering Materials Advisory Services Ltd, Solihull, UK, pp.1-60, 1995
Davies, J.M. : Sandwich panels , Thin-Walled Structure , Vol.16 , pp. 179- 198, 1993
Ley,R.P., Lin, W., and Mbanefo, U.: Face sheet wrinkling in sandwich structure. NASA: Langley Research Center, pp.1-30, 1999
Plantema, F. J.: Sandwich Construction. The Bending and Buckling of Sandiwch Beams, Plates and Shells. Johnwiley and Sons Inc., Newyork, London, Sydney,1966

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