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Mechanical Behavior of the Lamellar Structure in Semi-Crystalline Polymers
Simões, Ricardo; Viana, Júlio C.; Dias, Gustavo R.; Cunha, António M.We have employed molecular dynamics simulations to study the behavior of virtual polymeric materials under an applied uniaxial tensile load. Through computer simulations, one can obtain experimentally inaccessible information about phenomena taking place at the molecular and microscopic levels. Not only can the global material response be monitored and characterized along time, but the response of macromolecula...
Nonlinear 3D foot FEA modeling from CT scan medical images
Antunes, P. J.; Dias, Gustavo R.; Coelho, A. T.; Rebelo, F.; Pereira, TiagoA 3D anatomically detailed non-linear finite element analysis human foot model is the final result of density segmentation 3D reconstruction techniques applied in Computed Tomography (CT) scan DICOM standard images in conjunction with 3D Computer Aided Design operations and finite element analysis (FEA) modelling. Density segmentation techniques were used to geometrically define the foot bone structure and the ...
Hyperelastic modelling of cork-polyurethane gel composites : non-linear FEA imp...
Antunes, P. J.; Dias, Gustavo R.; Coelho, A. T.; Rebelo, F.; Pereira, TiagoThe CPGC – Cork-Polyurethane Gel Composite is a material that is mechanically characterized by non-linear elastic behaviour at large deformations. The non-linear behaviour can be modelled by hyperelastic constitutive models based on strain energy functions enabling a structured phenomenological framework for CPGC material modelling. The CPGC is a promising material for human comfort enhancement and dynamic damp...
Controlled delivery achieved with bi-layer matrix devices produced by co-inject...
Vaz, Cláudia M.; Doeveren, P. F. N. M. van; Dias, Gustavo R.; Reis, R. L.; Cunha, A. M.The aim of this study was to design new soy protein-based bi-layered co-injection moulded matrix systems aimed to achieve controlled drug delivery. The devices consisted of a drug-free outer layer (skin) and a drug-containing core. The systems overcame the inherent disadvantage of non-linear release associated with diffusion-controlled single-layer matrix devices by providing additional releasing area with time...
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