In this work, three-dimensional (3D) printing system based on fused deposition modeling (FDM) is used for the fabrication of conductive polymer nanocomposites. This technology consists in additive multilayer polymeric nanocomposite poly(lactic acid) (PLA) and graphene by means a house made low-cost commercial bench-top 3D printer. Further, printed PLA/graphene nanocomposites containing 10 wt% PLA matrix were characterized their mechanical, electrical electromagnetic induction shielding...

This paper presents a computational method for the simulation of welding process called friction stir welding. is divided into two main steps. The first one uses an Eulerian description thermomechanical problem; 3D mixed finite element model based on fluid dynamics package used to establish material flow, temperature and pressure fields during process. These results are compared with experimental data. second step more original. A part initial geometry extracted in order evaluate flow local...

In this work, a constitutive mechanical model is proposed to describe the thermo-mechanical cycle of semi-crystalline shape memory polyurethane which able recover its initial after applying more than 100% strain during cycle. To explore performance, experimental tests were conducted determine cyclic behavior polymer submitted five cycles. Indeed, uniaxial tensile at small rates performed 60 °C in order analyze hyper-elastic response. At end previous loading, relaxation carried out...

Air purifiers are limited to small polluting airborne particles and poor air circulation (fan) for bringing inside the device. Thus, optimal utility of domestic (DAPs) eliminating viruses is still ambiguous. This paper addresses above limitations using computational fluid dynamics modeling simulations investigate local design a DAP in an indoor space. We also integrated fan system transport viruses. Three different scenarios standard equipment (144 m3/h) explored space comprising furnished...

To reveal the potential and limits of multi-material three-dimensional (3D) printed parts in droplet-based additive manufacturing, a study combining tensile experiments 3D imaging technique is proposed. A polymeric composite structure made acrylonitrile butadiene styrene thermoplastic polyurethane manufactured using two extrusion head printer. The quality interface between thermoplastics quantified by adjusting number intertwining droplets at interface. Tensile assisted with digital image...

In this paper, we propose to improve static and dynamic mechanical performance of thermoplastic polyurethane (TPU) shape memory polymer by the addition halloysite nanotubes (HNTs). addition, a finite element simulation neat TPU its nanocomposites. HNT/TPU nanocomposites as polymers with different weight percentages contents were prepared melt extrusion polyurethane. This process induced homogeneous distribution good dispersion throughout matrix. Mechanical tests in tension demonstrated that...

Large‐scale X‐ray microcomputed tomography (μ‐CT) is used to investigate microstructural features of weld lines in a short glass fiber reinforced polymer. The main originality this work related the evaluation local structural and mechanical characteristics zones unmastered heterogeneities. Complete incomplete injection molded plates are considered with without process‐induced porosity. Using helical scanning trajectory, full 3D microstructure obtained at centimetric scale cover large zone...

Automotive heat exchangers are manufactured using brazed thin aluminium tubes and submitted to pressure pulses, thermal shocks corrosion. Thermal induce low cycle thermo-mechanical fatigue that leads failure after several thousand cycles. We propose a design approach for automotive based on the experimental identification of history during shock by infrared thermography, cyclic elasto-plastic behaviour development multiaxial lifetime criteria. A finite element simulation response in critical...