Accession Number : ADP000031

Title :   Optimality Criteria Design and Stress Constraint Processing,


Personal Author(s) : Levy,R.

Report Date : 1981

Pagination or Media Count : 9

Abstract : Methods for pre-screening stress constraints into either primary or side-constraint categories are reviewed; a projection method, which is developed from prior cycle stress resultant history, is introduced as an additional screening parameter. Stress resultant projections are also employed to modify the traditional stress-ratio, side-constraint boundary. A special application of structural modification reanalysis is applied to the critical stress constraints to provide feasible designs that are preferable to those obtained by conventional scaling. Sample problem executions show relatively short run times and fewer design cycle iterations to achieve low structural weights; those attained are comparable to the minimum values developed elsewhere. (Author)

Descriptors :   *Structural engineering, *Optimization, *Structural mechanics, *Stresses, Structures, Structural analysis, Structural response, Linear systems, Lightweight, Static loads, Displacement, Stress analysis, Stability, Redundancy, Lagrangian functions, Multiplication

Distribution Statement : APPROVED FOR PUBLIC RELEASE