Data processing: structural design – modeling – simulation – and em – Modeling by mathematical expression
Reexamination Certificate
2008-06-24
2008-06-24
Shah, Kamini S. (Department: 2128)
Data processing: structural design, modeling, simulation, and em
Modeling by mathematical expression
C716S030000, C345S420000
Reexamination Certificate
active
07392163
ABSTRACT:
Hourglass deformations due to zero-energy or hourglass modes in rank-deficient solid elements must be effectively controlled, or the deformations may grow large and produce an unrealistic deformed geometry. Traditional methods of hourglass control allow error to accumulate by measuring hourglass deformation with incremental terms throughout a solution, which may produce inaccurate results due to unrealistic hourglass deformations. The present invention discloses a new method to control hourglass deformation without any incremental accumulations. Instead the nodal forces to resist hourglass deformations are calculated basing on the initial nodal coordinates and current nodal coordinates at each cycle. The present invention is implemented in a finite element software product.
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Chu Roger
Day Herng-Der
Livermore Software Technology Corporation
Shah Kamini S.
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