Acta Polytechnica CTU Proceedings. 2023, vol. 42
Zobrazují se záznamy 1-18 z 18
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Response of the ultra high performance concrete under dynamic compressive loading
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Ultra high performance concrete is a modern cementitious material which exhibits excellent mechanical properties such as damage tolerance, fracture toughness and durability. These features make this materials suitable for ... -
Simulation of a multimaterial model for modified auxetic structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Auxetic structures, which is a term used to describe materials with a negative Poisson’s ratio, show beneficial properties like a low density, a high energy absorption capacity and an increased indentation resistance. This ... -
Mechanical properties of basalt: a study on compressive loading at different strain rates using SHPB
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This article focuses on the mechanical properties of basalt in compressive loading at different strain-rates. The study employs advanced instrumentation for the evaluation of the results in dynamic conditions, while standard ... -
Analysis of peel and shear strains in cracked lap shear specimens subjected to fatigue loading using digital image correlation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Adhesive bonding presents many advantages, such as efficient manufacturing and improved structural performance [1]. However, in structures subjected to fatigue, cracks might initiate and propagate in joints, leading to ... -
The possibilities of utilising the skiddometer T2GO for forensic engineering
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The aim of the paper is to verify the applicability of the T2GO skiddometer for measuring the coefficient of friction for forensic practice in accordance with the legislative framework of the Czech Republic. In the ... -
Asynchronous time integration while achieving zero interface energy
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This contribution deals with an asynchronous direct time integration of the finite-element model. The proposed method is applied to the phenomenon of wave propagation through an elastic linear continuum. The numerical model ... -
AI-assisted study of auxetic structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In this study, the viability of using machine learning models to predict stress-strain curves of auxetic structures based on geometry-describing parameters is explored. Given the computational cost and time associated with ... -
Desing of the algorithm, print and analysis of porous structures with modifiable parameters
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The purpose of this paper was to create an algorithm able to creating a porous structure with variable properties, print and analyze them. The basic concepts related to it were introduced and the process of creating an ... -
Volume changes measurement of elastomers using 3D DIC
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The presented research aims at measuring the volume changes of elastomers using digital image correlation (DIC) in the 3D configuration (stereo DIC). The deformation measurement method in stereo configuration was applied ... -
Computed tomography system with strict real-time synchronization for in-situ 3D analysis of periodically vibrating objects
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)In the contribution, we present a laboratory system capable of X-ray computed tomography (XCT) scanning of an periodically moving or oscillating object. The system is an in-house developed XCT setup with electromagnetic ... -
Fast continuous in-situ XCT of additively manufactured carbon fiber reinforced tensile test specimens
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The reinforcement of fused filament fabricated (FFF) components with continuous fibers allows for high versatility in the design of mechanical properties for a specific applications needs. However, the bonding quality ... -
High-speed X-ray radiography for experiments in impact dynamics using high-power X-ray tube, cesium iodine scintillator and laboratory optical camera
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)X-ray radiography and computed tomography have become well-established methods for investigation of internal structure of objects and for defectoscopy. Recently, the methods have even been used for in-situ analysis of ... -
Segmentation of pores in carbon fiber reinforced polymers using the U-Net convolutional neural network
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This study demonstrates the utilization of deep learning techniques for binary semantic segmentation of pores in carbon fiber reinforced polymers (CFRP) using X-ray computed tomography (XCT) datasets. The proposed workflow ... -
Effect of aging on mechanical properties of 3D printed samples using stereolitography
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)This paper focuses on stereolithography (an additive manufacturing technology working on the principle of curing liquid resins layer by layer using ultraviolet radiation) and the effect of aging on the mechanical properties ... -
Dynamic tests of the protective and security barrier system probar
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The purpose of this paper is to present a series of dynamic tests for testing the protective and security barrier of the PROBAR system, developed by STRIX Chomutov, a.s., according to the PAS 68:2013 standard. The goal of ... -
Effect of the long-term storage methods on the stability of cartilage biomechanical parameters
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Long-term stability of the tissue product in terms of mechanical parameters is a key factor for its expiration date. For the investigation of storage effects on the cartilage tissues the experimental mechanical loading ... -
Local defect formation in short glass fibre reinforced polymers – micro-mechanical simulations and interrupted in-situ experiments
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)Discontinuous fibre reinforced polymers are widely used in various industry sectors and often replace conventional materials, due to lower production costs and their lightweight structure. For improvement of the component ... -
Experimental validation of motion sensor Physilog®5 applied to shoulder joint
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)The main motivation of this paper is to verify the idea of using the Physilog®5 unit for the patients with shoulder movement difficulties. The attached sensor to the patient’s arm then measures motion during which the ...
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