Acta Polytechnica CTU Proceedings. 2024 ( vol. 46-51): Poslední příspěvky
Zobrazují se záznamy 41-60 z 95
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Properties of cement screeds using recycled fine aggregates with respect to cement percentage
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This article deals with the effect of 100% replacement of natural aggregate by recycled aggregate and at the same time the effect of cement percentage on the observed properties of cement screeds. For these purposes, ... -
Fractional order models of viscoelastic polymeric solids undergoing large deformations
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)We present a fractional order model for nonlinear visco-hyperelastic solids taking into account large deformations. A three-field form of the Hu-Washizu principle is introduced to create a stable finite element method in ... -
Dynamic behavior of a cable-stayed footbridge depending on the calculation accuracy
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Footbridges are analyzed in terms of dynamic response for pedestrian comfort. This problem is solved mainly on light and at the same time rigid constructions, which are easily oscillated by pedestrian load. It is often ... -
Image-based random fields in numerical modeling of heterogeneous materials
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Modeling of spatial variability using random fields is nowadays standard in computational modeling of heterogeneous materials. The only difficulty remains in determining the input parameters of the random field in order ... -
Effect of geometry on homogenised properties of selected auxetic metamaterials
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Our study investigates the influence of geometrical parameters of two types of auxetic metamaterials on their effective properties. In particular, we focus on three-dimensional lattice structures, which we represent with ... -
Experimental of verification of alternative hydraulic binders flexural and compressive strength
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The paper deals with the investigation of alternative binders, namely the two available samples N6 and N7 with comparison from the reference sample CEM I 42.5R. Both testing binders are provided by company Destro. It is a ... -
Validation of geotechnical laboratory tests data obtained from various sources
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Data validation is a critical step in every data analysis. It is a well-known fact that the results of any data analysis are directly dependent on the input values. This paper works with a worldwide database of laboratory ... -
Reconstruction of concrete morphology using deep learning
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In this contribution, the concrete morphology is reconstructed with a simple algorithm selecting a pixel value based on the small set of surrounding pixels. A deep neural network (DNN) is used as a classifier, and the ... -
Impact of bolt positioning on the stiffness of angular support brackets
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Bolts and screws are usually preferred over other joining techniques when assembly and disassembly operations are required. However, they add extra weight to the system, so it is essential to reduce their size and weight ... -
Design strategy for the prototyping of 3D-printed continuous fiber-reinforced components for solar-powered vehicle
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Continuous fiber fused filament fabrication is an advanced 3D printing method that allows designers to produce high-performing lightweight structures, leading toward innovative design philosophies and sustainable production ... -
Tomographic and mechanical study of 3D printed porous polymer structure under compression
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This study investigates the influence of open porosity rate and trabeculae diameter on the compressive behavior of structure printed by DLP technology. Three types of structures have been studied : two periodic structures ... -
Characterization of woven composite material under multiaxial loading regimes using FE-based stereocorrelation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)In this paper, woven glass fiber composite samples were subjected to three different cyclic loading histories (i.e., tensile, shear and combined loading at 45° via the Modified Arcan Fixture. During the experiments, the ... -
Fatigue analysis on flax-epoxy composites: insights and implications
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)This study investigates the performance of flax fiber and epoxy resin composites, focusing on fatigue testing, which is scarcely reported in the literature. Fatigue behavior is evaluated under full reverse bending loading ... -
Design of the testing procedure for investigation of Eryx conicus dermal armour characteristics
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The aim of this work is to develop an experimental method suitable for the mechanical testing of highly non-standard biological samples such as snake skin with osteoderms. The objective of the method is to determine, whether ... -
Tribo-technological features of laser powder bed fusion process: scratch and wear resistance of AlSi10Mg aluminium alloy
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Mechanical systems, regardless of their complexity, very often require that different parts must move relative to each other by sliding their surfaces, therefore appropriate tribological properties are needed. This request ... -
Assessment of local mechanical properties of laser powder bed fused aluminium alloy by non-destructive testing based on FIMEC indentation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Laser powder bed fusion process is a versatile metal additive manufacturing process. Although significant progress has been made so far, there is still limited large-scale adoption of this technique by the industry. The ... -
Ageing effects on the mechanical properties stability of 3D printed material under compression
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The paper deals with the examination of the ageing effects on the mechanical properties stability of 3D printed material via stereolithography under compression when subjected to various conditions, including UV radiation, ... -
A geometry projection method for designing and optimizing additively manufactured variable-stiffness composite laminates
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)A method for designing laminates is presented using geometry projection to optimize the layout of additively manufactured variable-stiffness composite laminates. By considering fiberreinforced bars as geometric primitives, ... -
Comparison of elastic properties of periodic and aperiodic porous structures produced by additive methods
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)The aim of this work was to design, print, and examine elastic properties of porous structures with various parameters and beam distributions. These structures, generated using an algorithm, featured three types of lattices: ... -
Dowel bars – reinforcing elements of cement concrete pavements
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)Our aim is to analyze the function of reinforcement elements (dowel bars) in cement concrete pavement to highlight the influence of these elements on the service life of the pavement as a whole and to find possible ...