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191 results on '"Guedes, J.M."'

17. An analytical model to predict optimal material properties in the context of optimal structural design

Author

Bendsoe, M.P., Guedes, J.M., Haber, R.B., Pedersen, P., and Taylor, J.E.

Subjects
Materials research -- Observations, Science and technology
Abstract

The optical configuration of a material in a structure governed by the objective for globally optimal design is determined by an analytical model. The analytical model represents the material configuration as an elastic constitutive tensor. This enables the determination of the bound on the global objective, when the local constraints on the elastic constitutive tensor are absent.

Published
1994

18. A Gradient-Based Strategy for the Optimization of Stiffened Composite Structures Subject to Multiple Load Cases and Multiple Failure Criteria

Author

Farzan Nasab, Farshad, Geijselaers, Bert, de Boer, A., Rodrigues, H.C., Herskovits, J., Mota Soares, C.M., Araújo, A.L., Guedes, J.M., Folgado, J.O., Moleiro, F., Madeira, J.F.A., Nonlinear Solid Mechanics, and Applied Mechanics

Subjects
business.industry, Computer science, Minimization problem, Composite number, Torsion (mechanics), Stiffness, Structural engineering, Multiple failure, Design for manufacturability, Buckling, Gradient based algorithm, medicine, medicine.symptom, business
Abstract

This work aims at investigating the applicability of the level-set based thickness optimization method, earlier proposed by the authors, to a realistic structure. The design has to have sufficient stiffness and strength while the structural mass is minimized. The concerned composite structure is subjected to multiple load cases. The proposed method guarantees the fulfillment of the design guidelines, namely symmetry, covering ply, disorientation, percentage rule, balance, and contiguity of the layup. The stiffeners divide a composite structure into several smaller panels. The manufacturability of a resulting design is guaranteed as plies are continuous among adjacent panels (the design is blended). The proposed method is successfully applied to the mass minimization problem of the stiffened top and bottom skin of a wing torsion box. The structure, subject to two load cases, is optimized where local buckling and allowable strain are the constraints of the problem.

Published
2018
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21. Optimal configuration of microstructure in ferroelectric materials by stochastic optimization

Author

Jayachandran, K.P., Guedes, J.M., and Rodrigues, H.C.

Subjects
Microstructure -- Electric properties, Piezoelectric ceramics -- Mechanical properties, Barium compounds -- Electric properties, Barium compounds -- Mechanical properties, Ferroelectric crystals -- Structure, Physics
Abstract

The article presents a new methodology, which can be used for the finding out the optimal configuration of the microstructure of different ferroelectric (FE) materials. The piezoelectric properties of the these materials are shown to be highly dependent on the grain orientation distribution.

Published
2010

22. Enhancement of the electromechanical response in ferroelectric ceramics by design

Author

Jayachandran, K.P., Guedes, J.M., and Rodrigues, H.C.

Subjects
Anisotropy -- Usage, Electromechanical devices -- Evaluation, Ferroelectric crystals -- Structure, Ferroelectric crystals -- Mechanical properties, Physics
Abstract

The continuum mechanics modeling and simulation techniques were employed to demonstrate the feasibility to obtain polycrystalline ceramic ferroelectric (FE) materials which beggar single crystals in electromechanical properties. The noncollinear rotation of the net polarization vectors embedded in crystallites of the ceramic FEs contributed significantly towards the enhancement of physical properties.

Published
2009

31. Hierarchical Optimization of Material and Structure for Thermal Transient Problems.

Author

Gladwell, G. M. L., Bendsøe, Martin Philip, Olhoff, Niels, Sigmund, Ole, Guedes, J.M., Lubrano, E., Rodrigues, H.C., and Turteltaub, S.

Abstract

This paper describes a multiscale computational algorithm to simultaneously optimize the macroscopic material distribution and the microscopic material layout of two-phase, non-homogeneous composite structures. The optimization of the composite material is performed within the context of transient thermal conduction problems. The objective is to identify the non-homogeneous composite that minimizes the difference, at a prescribed time T, between the actual values of the temperature field and a target temperature distribution. The methodology is illustrated with a relatively simple test problem that indicates that the procedure can successfully identify an optimal material layout at the micro- and macroscales. [ABSTRACT FROM AUTHOR]

Published
2006
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48. Optimization of Two-Stage Centrifugal Pump of Rocket Engine

Author

Zubanov, Vasilii, Volkov, Andrei, Matveev, Valeriy, Popov, Grigorii, Baturin, Oleg, Novikova, Yulia, Rodrigues, H.C., editor, Herskovits, J., editor, Mota Soares, C.M., editor, Araújo, A.L., editor, Guedes, J.M., editor, Folgado, J.O., editor, Moleiro, F., editor, and Madeira, J. F. A., editor

Published
2019
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