7 March 2012

De Wiki-castelldefels


on:
Wednesday, March 7th
at:
16:30
in the:
Sala Lounge CIMNE Castelldefels, C-3 building, Campus del Baix LLobregat

This week Chris Lee and Carlos Morillo from CIMNE invites us to:


LOW ENVIRONMENTAL IMPACT COMPOSITE STRUCTURES DESIGN OPTIMISATION

LOW ENVIRONMENTAL IMPACT COMPOSITE STRUCTURES DESIGN OPTIMISATION.
The paper investigates multi-objective stacking sequence design optimisation of environmental friendly composite structures using computational intelligence system and Finite Element Analysis (FEA). During the optimisation the model consists of multilayered eco-composites reinforced with low environmental impact natural fiber from agro-residues into two polymers matrix widely used in green composites: Poly 3-hydroxybuty-rate-co-3-hydroxyvalerate (PHBV) and Polypropylene (PP). Two design problems of stacking sequence are considered; the first test case maximises the stiffness of Eco-Composite Structure (ECS) while minimising its total weight. The second application is to maximise the stiffness while minimising its total weight and Environmental Impact (EI). For the optimisation, Distributed/Parallel Genetic Algorithm (GA) in Robust Multi-objective Optimisation Platform (RMOP) developed at CIMNE is used and it is coupled with a FEA based composite structure analysis tool named Compack to find the optimal combination of stacking sequences for eco-composites structures. The innovations in this study are over the development of optimization methods for eco-composites, and the use of multidisciplinary optimization methodology considering the mechanical performance and Environmental Impact (EI) simultaneously.

Numerical results show that the optimal eco-composite structures have higher stiffness with lower weight and lower environmental impact when compared to PHBV biopolimer structures, and similar mechanical properties to PP syntethic polymers structures with significant reduction in its environmental impact.


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Keywords: Optimisation, Hybrid, Composite, Structures

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