In many applications, polymeric foams (such as expanded polystyrene or polypropylene) are used for protection from impacts. Standard design requires the foam to maximize energy absorption, thus achieving large deformations (typically up 25% and above in compression) while maintaining stress level below a threshold value. this work, steam chest-moulded EPS EPP were characterized relation their density, microstructure applied strain rate. Typical mechanical parameters (elastic moduli plateau...

Abstract Background To investigate and compare the gap (i.e. fit) thickness of six aligner systems (Airnivol, ALL IN, Arc Angel, F22, Invisalign Nuvola) using industrial computed tomography (CT). The null hypothesis was that there would be no detectable differences in either measurement between aligners investigated. Materials methods Passive each brand were fitted to one single resin cast prototyped from an STL file a patient. samples obtained examined under high-resolution micro-CT,...

Porosity represents a critical issue in composite manufacturing often leading to parts rejection. The aim of this work was develop multiphysic model capable predict the conditions porosity generated by water processed autoclave lamination. developed does not assess void growth phenomenon, as other models literature, but it enables prediction thermodynamic for water-generated porosity, where they could occur and how prevent their presence suitably modifying process parameters. potential...

To assess the effects of thermoforming on aligner thickness and gap width in six systems with same nominal thickness.Six passive upper aligners different brands were adapted to a single printed cast. Each sample was evaluated high-resolution micro-computed tomography. investigate width, two-dimensional (2D) analysis conducted assessing following variables: tooth type (central incisor, canine, first molar), 2D reference points, type. Data analyzed compared using variance Tukey's post-hoc...

This study is aimed at investigating the structure of a scaffold made bovine gelatin and hydroxyapatite for bone tissue engineering purposes. In particular, detailed characterization such material has great relevance because its application in healing process osteochondral defect that consists damage cartilage injury adjacent subchondral bone, significantly compromising millions patient's quality life. Two different techniques exploiting X-ray radiation, with table-top setups, are used:...

Advanced polymeric foams with enhanced thermal insulation and mechanical properties are used in a wide range of industrial applications. The foam strongly depend upon its cell structure. Traditionally, their microstructure has been studied using 2D imaging systems based on optical or electron microscopy, the obvious disadvantage that only surface sample can be analysed. To overcome this shortcoming, adoption X-ray micro-tomography is here suggested to allow for complete 3D, non-destructive...

Summary Structural anisotropy of two‐phase materials can be evaluated through global measurements, as volume orientation or mean‐intercept length methods do, statistics performed on a set individual measurements. This last procedure is encouraged by recent improvements in the spatial resolution conventional X‐ray tomography. In this paper, above‐described approaches were compared three case studies: foam subjected to an situ compression test, second with completely different cell morphology...

In this study, the effect of increasing exposure time on microstructures, porosity, mechanical properties and corrosion behavior selective laser melted sample Al-Si10-Mg powder was investigated. The samples were processed at same power (375 W) scan speed (2000 mm/s), but with time. Exposure equal to 40, 50 60 µs applied. features analyzed show that time, greater efficiency heat input obtained, a larger size melt pool Si particles lower porosity. Specifically, highest showed an increase 19%...

Abstract In this work, a general method to predict the stiffness tensor of short‐fiber composites as function fabric (i.e. describing architectural anisotropy micro‐structure), determined by X‐ray computed tomography, is presented. The proposed does not depend on type used characterize symmetry properties composite. experimental data for validation were obtained from thermoplastic composite matrices reinforced with short carbon and basalt fibers. components calculated using Mori‐Tanaka model...

Abstract In this reported research activity, a quantitatively 3D characterization at microscale of CFRP reference composite with controlled porosity was performed by micro X-ray CT (µXCT); the results were compared destructive acid digestion analyses, following procedure in standard test method (ASTM D 3171 15) used to determine composites’ General Aviation (GA). The μXCT analyses revealed pore content 4.37%v and identified components, respectively, 66%w carbon fibres 34%w matrix; all...

Carbon fiber reinforced plastics (CFRPs) in the form of laminated composites are widely used various sectors, such as aeronautics and clean energy fields, due to their superior mechanical properties compared traditional homogeneous composites. In this study, authors developed a manufacturing process based on thermoforming 7-layer stack plain weave fabrics made from hybrid yarns (polyamide 6/recycled carbon fibers) introduce new method for reusing end-of-life (EoL) CFRPs avoid landfilling....

Summary Mechanical properties of fibres reinforced composite materials depend on the type used, their percentage as well arrangement and orientation. As computer technology continues to improve, high‐resolution computed tomography has proven be an ideal instrument analyse structure this kind materials. In context, various approaches have been proposed detect fibre orientation distribution relative degree anisotropy these Some are based ‘individual’ measurements that isolate reconstruct each...

In this study, the effect of increasing exposure time on microstructures, defectiveness, mechanical properties and corrosion behavior selective laser melted sample Al-Si10-Mg powder have been investigated. The were processed at same power (375 W) scan speed (2000 mm/s) but with time. Exposure equal to 40, 50 60 µs was applied. features analyzed samples show that a better efficiency heat input has obtained larger size melting pool Si particles lower defectiveness. Moreover, being coarser...

To describe a procedure that uses definitive BioHPP hybrid abutment (polyether ether ketone [PEEK] reinforced with ceramic nanoparticles), to obtain hermetic mucous seal the peri-implant soft tissues. Method and materials: Between July 2017 December 2019, seven patients aged between 40 60 years, who needed prosthetic rehabilitation in esthetic zone, were treated. Among various therapeutic solutions offered, chose an immediate or conventional implant using "one abutment-one time" technique...

Three-dimensional laser scanner is a modern technology used to detect and capture the shape of complex objects. There are lot possible application fields for this technology: applications in industrial sector (reverse engineering), medical field or cultural heritage virtual reconstruction works art. The main goal work make accessible three-dimensional models obtained from scans on mobile devices (smartphones, tablets), exploiting remote rendering high-performance workstations. This paper...