Acta Polytechnica CTU Proceedings. 2024 ( vol. 46-51): Poslední příspěvky
Zobrazují se záznamy 21-40 z 95
-
Multi-parameter optimization of layered WS2-polymer nanocomposite under mechanical loading
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The aim of the study is to determine the optimal geometry and magnitude of the applied load to ensure safety and prevent delamination in a three-layered nanocomposite structure under axial mechanical loading. The structure ... -
Changing the integrity of the material surface by combining laser surface texturing and PVD magnetron sputtering technologies
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The presented research combines laser micromachining technology (LST, Laser Surface Texturing) using an ultra-short femtosecond laser beam and PVD deposition of thin layers using magnetron sputtering. This combination has ... -
Influence of laser beam welding parameters on local mechanical properties of duplex stainless steel joints
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Duplex stainless steels (DSS) are dual-phase alloys consisting of austenitic and ferritic phases in the microstructure. DSS provide an ideal compromise between mechanical properties and corrosion resistance. Welding of DSS ... -
Comparison of Berkovich and spherical tip indentation for determining the Young’s modulus of polymer thin films encapsulated by a dielectric
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Pixel integrated micro-lenses for CMOS image sensors consist of a stack of polymer acrylate resin films encapsulated by a dielectric layer. Due to the mismatch of thermomechanical properties, adhesive or cohesive fractures ... -
About the choice of Tungsten carbide indenter to determine mechanical properties of superalloys by using high-temperature microhardness tester
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In the aeronautical field, materials are used in severe environmental conditions (temperature, atmosphere), particularly in engine applications. In order to qualify mechanical properties of new composition Ni-based ... -
Parametric analysis for interphase shear stress in MoS2/PET nanocomposite under thermo-mechanical loading
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In this study, a parametric analysis on the factors, that influence the value of theoretical interphase shear stress (ISS) in nanocomposite MoS2/PET, subjected to thermo-mechanical loading has been performed. The theoretical ... -
Nanomechanical properties of neutron-irradiated concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Concrete exposed to irradiation from nuclear reactor undergoes atomic-level degradation due to the influence of neutrons, secondary gamma rays, and associated gamma heating. The radiationinduced damage decreases the ... -
Micromechanical characterization of γ-irradiated cement paste exposed to different relative humidity conditions
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In this study, well-hydrated cement paste samples made from Portland cement CEM I-42.5R were gamma irradiated with a 200 TBq 60Co source, resulting in a total absorbed dose of 13.82MGy. During irradiation, the samples were ... -
Understanding intrinsic stress effects on vibrational response of silicon nanowires
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Silicon nanowires have become integral components in nanoelectromechanical systems and nanoelectronics. This article explores the intricate relationship between intrinsic stress and mechanical behavior in silicon nanowires. ... -
Finite element analysis of nanoindentation pile-up and correction of projected contact area
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This paper deals with the pile-up phenomenon that can occur during nanoindentation. Finite Element (FE) simulation of X5CrNiCuNb16-4 steel nanoindentation with pyramidal Berkovich indenter was done, and stress and strain ... -
Optimization of FIB milling procedure for micromechanical testing of cement pastes
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This study focuses on optimizing the Focused Ion Beam (FIB) preparation process for micro-beams made from cement paste prepared from Portland cement CEM I-42.5R, which includes four phases: inner and outer products, ... -
A simplified design of a concrete sandwich structure containing a reinforcing rib
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This article presents the use of a strut and tie analogy for modelling the behaviour of a concrete sandwich structure, which is formed by thin outer concrete layers made of high-performance concrete and reinforcing ribs. ... -
Experimental dynamic analysis of the footbridge across Jizera River in Mladá Boleslav
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The text of this submitted paper is devoted to the experimental dynamic analysis of the newly designed footbridge across the Jizera River in Mladá Boleslav. Theoretical modal analysis has shown potential risk that some of ... -
Laboratory verification of the properties of recycled fine aggregates and the effect of different replacement percentages on concrete properties
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This research work deals with the issue of laboratory testing of commonly available recycled fine aggregates, namely concrete recyclate, mixed recyclate and brick recyclate. Their geometrical properties: granulometric ... -
Formulation and implementation of nonlinear elasticity in advanced constitutive models in geomechanics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Several formulations of a nonlinear elastic behavior within the yield surface of the selected advanced constitutive models are described and compared. Since concentrating on geotechnical applications the accompanied numerical ... -
QCT/FEA analyses of palateless splinted and unsplinted maxillary all-on-4 systems
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The goal of the presented study was to determine the viability of using splinted and unsplinted maxillary implant-supported overdentures. The main physical quantity used to evaluate their differences was compressive stress ... -
Measurement of tensile properties of selected rovings
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This article is focused on measuring the tensile properties of chosen fibre materials, such as flax, alkali resistant glass or viscose. All selected materials were tested both pure and impregnated using epoxy resin. In ... -
The concept of fractured rock-mass modeling using DFN-based statistical volume elements
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The overall mechanical response of a fractured rock mass is, to a large extent, affected by naturally occurring fractures that exhibit sizes from millimeters to kilometers. Thus, in analysis of underground structures, such ... -
Transforming point cloud data into 3D BIM models: a case study on slabs
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)We explore the automatized transition of point cloud data into a Building Information Model (BIM), an essential task for reconstructions, demolition plans, or auditing. In this study, we use point cloud data generated by ... -
Numerical modeling of concrete beams subjected to partial wetting and drying cycles
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Concrete structures are commonly subjected to cycles of wetting and drying, which can have a significant impact on their behavior. However, experimental data on the effects of wetting and drying on concrete beams are scarce. ...