Accession Number : ADA117945

Title :   Analytical and Experimental Investigations of Bimodular Composite Beams.

Descriptive Note : Technical rept.,

Corporate Author : OKLAHOMA UNIV NORMAN SCHOOL OF AEROSPACE MECHANICAL AND NUCLEAR ENGINEERING

Personal Author(s) : Bert,Charles W ; Rebello,Clarence A ; Rebello,C J

PDF Url : ADA117945

Report Date : Jul 1982

Pagination or Media Count : 84

Abstract : This study deals with both analytical and experimental investigations of sandwich beams with cores of polyurethane foam and facings of unidirectional cord-rubber, which is bimodular (i.e., having drastically different behavoir in compression as compared to tension). This work is believed to be the first devoted to vibration of bimodular mateials in a sandwich configuration. Two different analyses are presented: one is a sandwich version of the well-known Timoshenko beam theory, which results in a fourth-order flexural differential equation. The other is a refinement of the DiTaranto-Mead-Markus sixth-order theory with the addition of rotatory inertia. Theoretical and experimental results are presented for the frequencies of the first three modes of vibration for a pin-ended beam without axial restraint.

Descriptors :   *Beams(Structural), *Sandwich construction, *Vibration, *Mathematical models, Cores, Polyurethane resins, Rubber

Subject Categories : Numerical Mathematics
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE