A penalty approach to obtain lower bound buckling loads for imperfection-sensitive shells
- Godoy, Luis Augusto
- Jaca, Rossana Claudia
- Sosa, Milton Eduardo
- Flores, Fernando Gabriel
DOIAbstract
The strategy of Reduced Stiffness (or Reduced Energy) Analysis, in which selected energy components are eliminated to account for mode interaction and imperfection-sensitivity in a simplified way, was developed by Croll and co-workers since the early 1980s. This physical interpretation allows the formulation as an eigenvalue problem, in which the eigenvalue (critical load) is a lower bound to experiments and to nonlinear incremental analysis. This paper considers the computational implementation of both reduced stiffness and reduced energy approaches to the buckling of shell structures by means of perturbation techniques and penalty parameter methods. The structural configurations of interest in this work are cylindrical shells with or with...
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