Abstract The paper focuses on researching the effect of fatigue loading metallic structure, lifetime, and fracture surface topographies in AISI H13 steel specimens obtained by selective laser melting (SLM). topography surfaces was measured over their entire area, according to total area method, with an optical three-dimensional measurement system. results SLM 3D printed were compared those reported for conventionally manufactured 13H steel. investigation also considers roughness specimens’...

Abstract Microflow and nanoflow rate calibrations are important in several applications such as liquid chromatography, (scaled-down) process technology, special health-care applications. However, traceability the microflow range does not go below 16 μl/min Europe. Furthermore, European metrology organization EURAMET did yet validate this by means of an intercomparison between different National Metrology Institutes (NMIs). The NMIs METAS, Centre Technique des Industries Aérauliques et...

The current study aimed to compare the F1 endodontic instruments from five different heat-treated rotary systems regarding their design, metallurgical properties, and mechanical performance. Five root canal shaping (ProTaper Gold [PTG], Premium Taper Gold, Go-Taper Flex, EdgeTaper Platinum, Super Files Blue)-plus, a conventional ProTaper Universal (PTU)-which were evaluated nickel/titanium ratio, phase transformation temperatures, microhardness, cyclic fatigue, torsional bending strengths....

In this paper, the applicability of cumulative strain energy density is explored as a fatigue indicator parameter for advanced high-strength steels subjected to strain-controlled conditions. Firstly, cyclic stress–strain responses nine steels, selected from three multiphase families, encompassing different elemental compositions and heat treatment routes, were studied. Then, predictive capabilities proposed model compared with those other strain-based energy-based approaches. It was found...

Orthotic devices play an important role in medical treatment, addressing various pathologies and promoting patient recovery. Customization of orthoses to fit individual morphologies needs is essential for optimal functionality comfort. The advent additive manufacturing has revolutionized the biomedical field, offering advantages such as cost reduction, increased personalization, enhanced dimensional adaptability orthotics manufacturing. This research focuses on impact strength nine polymeric...

Abstract This work aims to compare the mechanical behavior of an AISI H13 steel obtained by additive manufacturing with that conventional methods. The average values ultimate tensile strength (UTS) and ductility for specimens produced method were equal 658 MPa 18%, respectively, which compares 503 0.75% registered selective laser melting (SLM) specimens. Inversely, hardness value determined SLM was higher, 450 HV, than observed conventional, 200 HV. In addition, maximum applied stress...

The paper herein presented refers to the numerical simulations of a TIG butt-welding process applied thin plates made ​​of an AISI 316L austenitic stainless steel. Finite element (FE) thermal analyses were initially carried out in order obtain transient temperature distributions plates, and, subsequently time-dependent results used FE structural analyses, calculate residual stresses and deformations introduced by welding process. A double Gaussian distribution – namely ellipsoid -, with...

Abstract Selective laser melting (SLM) is an additive manufacturing powder‐bed fusion process that allows producing complex metallic parts with a relative density of up to 99.9%. Nevertheless, the mechanical properties these components depend on numerous variables, and there lack systematic studies focused SLM stainless steels. In work herein presented, three specific printing strategies were X‐Y patterned manufacture Compact Tension specimens transversally, longitudinally, or...

In this study, we investigate the cracking behaviour of softwood species using MMCG fracture test. Our primary objective is to directly measure crack length propagation in mode I loading and associated parameters. To achieve this, employ Arcan system apply load specimen. We used Digital Image Correlation (DIC) displacement strain fields ahead advancing crack. Fracture properties were determined compliance method, providing an estimate critical energy release rate for I. Two different...

Dimensional measurements are fundamental in microfluidic device manufacturing and performance. The main focus of this study is the measurement connection port sizes devices components and, accordingly, possible existence fluid leaks determined using flow rate error. associated with three different systems were laser interferometry through an optical measuring instrument, metrological traceability to national length standards. It was infer method greatest accuracy lowest uncertainty for...

ABSTRACT Although there are a great number of numerical studies focused on the simulation crack shape evolution, deeper understanding is required concerning parameters and mathematical modelling. Therefore, objectives paper study influence parameters, particularly radial size front elements magnitude individual extensions, modelling propagation regimes, linking changes with K distribution. A relatively simple through‐crack geometry, CT specimen, was studied model validated experimental...

Abstract For critical drug delivery, it is important to have a constant and well-known infusion rate delivered by the complete set-up (pump, tubing, accessories). Therefore, various delivery devices accessories were tested in this article terms of their accuracy, start-up delay, response time, dependency on viscosity. These measurements performed as part European funded research project MeDD. The obtained results show that accuracy flow accessory depended, especially for low rates. Viscosity...

The nickel-titanium (NiTi) instruments' geometry plays an important role in their performance and behavior. present assessment intends to validate test the applicability of a 3D surface scanning method using high-resolution laboratory-based optical scanner create reliable virtual models NiTi instruments. Sixteen instruments were scanned 12-megapixel scanner, methodological validation was performed by comparing quantitative qualitative measurements specific dimensions identifying some...

Polyetheretherketone (PEEK) is the leading high-performance thermoplastic biomaterial that can be processed through material extrusion (ME) additive manufacturing (AM), also known as three-dimensional (3D) printing, for patient-specific load-bearing implant manufacture. Considering importance of cyclic loading design, this work addresses high-cycle fatigue behaviour 3D-printed PEEK. In work, printed PEEK specimens are cyclically loaded under stress-controlled tension–tension using different...

Hydraulic jumps on the steps of a stepped spillway were investigated analytically, physically, and numerically. Using classic hydraulic formulae, conceptual prototype was designed. A large scale model adapted an experimental study conducted to examine similarity each step, minimizing jump length maximizing discharge per unit width. numerical based 2D Reynolds averaged equations, where free-surface is represented using refined volume-of-fluid algorithm, internal obstacles are described by...

The precise measurement of micro and nanoflow incompressible liquids (below 1 μL/h) is a complex task due to several factors involved in, namely, evaporation, adsorption the existence air bubbles within system. Nevertheless, importance its undeniable in equipment such as insulin pumps, or medical drug delivery devices for new-born, microchip flow mention few. work herein presented was developed partnership between Volume Flow Laboratory (LVC) Portuguese Institute Quality (IPQ) Department...