SBIR 95-1 SOLICITATION
NEW HIGH-ORDER ELEMENTS FOR EFFICIENT MULTIDISCIPLINARY ANALYSIS
A new family of plate/shell finite elements has been conceived.
Versions with 3, 4, 6, 8, 9 and 10 nodes are possible. More efficient
and more accurate calculation is expected for deflection, stress,
thermal stress, buckling, and for vibration which is influenced by all
of these. Interlaminar shear stress calculation should be especially
improved. Shear deformation is included, which is essential for
analysis of composite and sandwich structures. All constant strain
states are represented exactly in the new elements. In contrast, the
shear-deformable plate/shell elements in current commercial use have
spurious shear energy in (what should be) pure bending, and frequently
require arbitrary reduction of shear moduli or under-integration to
avoid "locking," which can in turn cause zero-energy deformation modes
or "mechanisms." The LU71 element in the STARS program used at DFRF is
equivalent to the 3-node version of the new family.
Safety-critical calculations such as predicting flutter in flight
tests requires a higher standard of reliability than most applications.
The new family of elements can provide an independent verification
based on a different theoretical formulation as well as improve
efficiency and accuracy.
Potential Commercial Applications:
Incorporation in the STARS code used at DFRF may be the first
application. It is expected that these superior-quality finite
elements will be incorporated in a package of isoparametric elements
and licensed for use in one or several of the major American commercial
finite element programs. Finite element analysis is a multi-billion-
dollar-per-year worldwide industry.
Name and Address of Offeror:
1601 Ridgeway Road
Lincoln, NE 68506
Small Business Innovation Research Program (SBIR) &
Small Business Technology Transfer Program (STTR) Programs
Electronic Management System (EMS)
National Aeronautics and Space Administration (NASA)
The SBIR/STTR EMS site is maintained by Steve
Hu, Hughes STX.
For comments and questions, contact
Updated: Feb. 7, 1996