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• W2909969360 abstract "The recent advancement of nanotechnology has enabled the fabrication of nanofibers througha number of processing techniques. Among these, electrospinning offers a uniqueability to produce nanofibrous membranes for different materials and of different assembliesor textures that make them suitable for various applications including filtration, tissueengineering, nanocomposites and textiles. In these applications, electrospun nanofibrousmembranes are frequently subjected to complex stresses and strains which could lead tofiber failures. Therefore, the understanding of their mechanical properties becomes crucialin order to facilitate the design and performance evaluation of the materials. In view ofprobing the mechanical response of nanofibrous membranes, relevant experimental characterizationsare conducted such as atomic force microscopy (AFM), nanoindentation, nanotensiletests or conventional tensile tests. These experimental techniques are often daunting,costly and time-consuming. If a robust and cost-effective alternative method in evaluatingthe mechanical properties of electrospun nanofibrous materials through numerical simulationcan be established, the strong dependence on experimental works can therefore besignificantly reduced. The present thesis focuses on the development of a simple constitutivemodel with reduced number of material parameters for the mechanical response ofrandomly oriented electrospun PVDF nanofibrous membranes. To this end, the thesis isdivided into two parts. The first part focuses on the experimental aspects that include thefabrication of electrospun nanofibrous membranes using different sets of electrospinningparameters and the characterization of their surface morphology. Subsequently, samplesobtained using the optimum set of parameters are chosen for further characterizations, i.e.physical evaluation of undeformed and deformed membranes, mechanical testing and fiber orientation analysis. Three types of uniaxial mechanical tests are conducted: monotonictensile tests, cyclic loading tests with increasing maximum strain and cyclic-relaxation tests.Results show that the material exhibits complex mechanical responses, which includefinite strain, irreversible deformation, hysteresis and time-dependent response. Furthermore,fiber orientation analysis suggests that the material is initially isotropic in the plane(transversely isotropic) and the deformation-induced fiber re-orientation takes place. Thesecond part of the thesis deals with the development of a constitutive model capturing theobserved responses. Motivated by the experimental observation, the model developmentstarts from the description of material response at fiber-scale in order to describe individualfiber response and irreversible inter-fiber interactions using hyperelastic and large strainelasto-plastic frameworks respectively. The macroscopic response of the membranes is subsequentlyobtained by integrating the fiber responses in all possible fiber orientations. Theefficiency of the proposed model is assessed using experimental data. It is found that themodel is qualitatively in good agreement with uniaxial monotonic and cyclic tensile loadingtests. Two other deformation modes, i.e. equibiaxial extension and pure shear (planarextension) are simulated to further evaluate the model responses." @default.
• W2909969360 created "2019-01-25" @default.
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• W2909969360 date "2018-08-01" @default.
• W2909969360 modified "2023-09-24" @default.
• W2909969360 title "Experimental investigation and constitutive modeling of randomly oriented electrospun nanofibrous membranes / Wong Dannee" @default.
• W2909969360 hasPublicationYear "2018" @default.
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