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Refinement of timoshenko beam theory for composite and sandwich beams using zigzag kinematics
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Tessler, Alexander Gherlone, Marco DiSciuva, Marco |
| Copyright Year | 2007 |
| Description | A new refined theory for laminated-composite and sandwich beams that contains the kinematics of the Timoshenko Beam Theory as a proper baseline subset is presented. This variationally consistent theory is derived from the virtual work principle and employs a novel piecewise linear zigzag function that provides a more realistic representation of the deformation states of transverse shear flexible beams than other similar theories. This new zigzag function is unique in that it vanishes at the top and bottom bounding surfaces of a beam. The formulation does not enforce continuity of the transverse shear stress across the beam s cross-section, yet is robust. Two major shortcomings that are inherent in the previous zigzag theories, shear-force inconsistency and difficulties in simulating clamped boundary conditions, and that have greatly limited the utility of these previous theories are discussed in detail. An approach that has successfully resolved these shortcomings is presented herein. This new theory can be readily extended to plate and shell structures, and should be useful for obtaining accurate estimates of structural response of laminated composites. |
| File Size | 1143299 |
| Page Count | 45 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20070035078 |
| Archival Resource Key | ark:/13960/t9b61jm2g |
| Language | English |
| Publisher Date | 2007-11-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Deformation Simulation Kinematics Shear Stress Boundary Conditions Transverse Loads Laminates Composite Structures Sandwich Structures Estimates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
