Compliant Fluidic Control Structures

Compliant Fluidic Control Structures: Concept and synthesis approach

Kumar, P. (TU Delft Computational Design and Mechanics)
Fanzio, P. (TU Delft Micro and Nano Engineering)
Sasso, L. (TU Delft Micro and Nano Engineering)
Langelaar, Matthijs (TU Delft Computational Design and Mechanics)

2019

The concept and synthesis approach for planar Compliant Fluidic Control Structures (CFCSs), monolithic flexible continua with embedded functional pores, is presented in this manuscript. Such structures are envisioned to find application in biomedicine as tunable microfluidic devices for drug/nutrient delivery. The functional pores enlarge and/or contract upon deformation of the compliant structure in response to external stimuli, facilitating the regulated control of fluid/nutrient/drug transport. A thickness design variable based topology optimization problem is formulated to generate effective designs of these structures. An objective based on hydraulic diameter(s) is conceptualized, and it is extremized using a gradient based optimizer. Both geometrical and material nonlinearities are considered. The nonlinear behaviour of employed hyperelastic material is modeled via the Arruda-Boyce constitutive material model. Large-displacement finite element analysis is performed using the updated Lagrangian formulation in plane-stress setting. The proposed synthesis approach is applied to various CFCSs for a variety of fluidic control functionalities. The optimized designs of various CFCSs with single and/or multiple functional pores are fabricated via a Polydimethylsiloxane (PDMS) soft lithography process, using a high precision 3D printed mold and their performances are compared with the numerical predictions.

Compliant structures
Microfluidic devices
Nonlinear finite element analysis
PDMS
Topology optimization

http://resolver.tudelft.nl/uuid:80ae1398-bb2c-4f96-a0ec-282d849349c5

https://doi.org/10.1016/j.compstruc.2019.02.004

2019-09-04

0045-7949

Computers & Structures, 216, 26-39

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2019 P. Kumar, P. Fanzio, L. Sasso, Matthijs Langelaar