Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Stress-constrained level set topology optimization for compliant mechanisms

Full text
Emmendoerfer Jr, Helio ; Fancello, Eduardo Alberto [1] ; Nelli Silva, Emilio Carlos [2]
Total Authors: 3
[1] Univ Fed Santa Catarina, Dept Mech Engn, Campus Univ Trindade, BR-88040900 Florianopolis, SC - Brazil
[2] Emmendoerfer Jr, Jr., Helio, Univ Sao Paulo, Dept Mechatron & Mech Syst Engn, Av Prof Mello Moraes 2231, BR-05508030 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

This work presents a level set-based topology optimization procedure to design compliant mechanisms subject to local stress constraints. A classical technical difficulty related to the design of compliant mechanisms is the emergence of non-realistic flexible joints (hinges) subject to unfeasible strain and stresses. A natural way to overcome this occurrence is the inclusion of stress constraints within the formulation. This approach brings, on the other hand, particular difficulties associated with the local nature of stress constraints. To deal with this issue, stress constraints are included in the present work using an augmented Lagrangian mathematical programming technique. A level set approach defines the design of the mechanical part and a reaction-diffusion equation is used to update the level set function towards the optimized state. A natural extension of the velocity field provided for the reaction-diffusion equation allows for hole nucleation during the design updating. The joining of an augmented Lagrangian approach and level set implicit boundaries to handle local stress constraints in order to obtain hinge-free compliant mechanisms is the novelty of this paper. Several two-dimensional numerical examples show the efficacy of the proposed procedure. In particular, an example analyzes the influence of the weak material in the design of compliant mechanisms. Level set designs enable that final solutions are validated in commercial finite element codes without any post-processing procedure. (C) 2019 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 16/09923-2 - Labyrinth seals design using topology optimization based on a level set approach
Grantee:Hélio Emmendoerfer Junior
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/21350-3 - Labyrinth Seals design using multi-material topology optimization based on a level set approach
Grantee:Hélio Emmendoerfer Junior
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support Opportunities: Research Grants - Research Centers in Engineering Program