Prohlížení Acta Polytechnica CTU Proceedings. 2017, vol. 13 dle názvu
Zobrazují se záznamy 16-31 z 31
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NON-INVASIVE INVERSE PROBLEM IN CIVIL ENGINEERING
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)In this contribution we focus on recovery of spatial distribution of material parameters utilizing only non-invasive boundary measurements. Such methods has gained its importance as imaging techniques in medicine, geophysics ... -
ON DEVELOPMENT OF THE INTERACTIVE DESIGN TOOL BASED ON ISOGEOMETRIC ANALYSIS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Isogeometric analysis is a new concept of Finite element method which has been proposed to bridge the gap between the CAD systems and the FEM solvers. In Isogeometric analysis, the same basis functions, typically splines ... -
OPTIMIZATION-BASED APPROACH TO TILING OF FINITE AREAS WITH ARBITRARY SETS OF WANG TILES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Wang tiles proved to be a convenient tool for the design of aperiodic tilings in computer graphics and in materials engineering. While there are several algorithms for generation of finite-sized tilings, they exploit the ... -
PARALLEL APPROACH TO SOLVE OF THE DIRECT SOLUTION OF LARGE SPARSE SYSTEMS OF LINEAR EQUATIONS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)The paper deals with parallel approach for the numerical solution of large, sparse, non-symmetric systems of linear equations, that can be part of any finite element software. In this contribution, the differences between ... -
PERFORMANCE OF CEMENT COMPOSITES REINFORCED WITH SURFACE-MODIFIED POLYPROPYLENE MICRO- AND MACRO-FIBERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This paper focuses on the mechanical properties investigation of cement pastes reinforced with surface treated polymer fibers. The cement matrix was composed of Portland cement (CEM I 42.5 R, w/c ratio equal to 0.4). Two ... -
PLASMA TREATMENT IMPACT ON PHYSICAL AND CHEMICAL PROPERTIES OF POLYMERIC FIBERS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Presented work focuses on chemical and physical properties of plasma modified polymeric macro-fibers. Polyethylene terephthalate (PET) and polypropylene (PP) fibers having approx. 300 μm in diameter were modified using ... -
PULLOUT BEHAVIOR OF OXYGEN PLASMA TREATED POLYMER FIBERS FROM CEMENT MATRIX
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)The aim of this work is to describe bonding properties between surface treated polymer fibers and a cement matrix. In order to increase an interaction between the matrix and fiber surfaces, two fiber types having approx. ... -
SOLID BURNT BRICKS’ TENSILE STRENGTH
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This paper deals with experimental testing of solid burnt bricks and mortar in pure (axial) tension. The obtained working diagrams will be further use for a detailed numerical analysis of whole brick masonry column under ... -
SYNTHESIZED ENRICHMENT FUNCTIONS FOR EXTENDED FINITE ELEMENT ANALYSES WITH FULLY RESOLVED MICROSTRUCTURE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Inspired by the first order numerical homogenization, we present a method for extracting continuous fluctuation fields from the Wang tile based compression of a material microstructure. The fluctuation fields are then used ... -
THE EFFECT OF PLASTICIZER ON MECHANICAL PROPERTIES OF THE CEMENT PASTE WITH FINE GROUND RECYCLED CONCRETE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This article deals with the usage of recycled concrete, which arises from the demolition of concrete structures. The work is focused on the development of mechanical properties (Young's modulus, compressive and flexural ... -
THE OCCURRENCE OF SYNCHRONIZED JUMPING CROWD AT SPORTS STADIUMS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Since the age of the Rome Empire, people have been going for fun at the stadiums. Today, important reasons for visiting the stadium are sport games or cultural performances. The text is about occurrence of specific types ... -
USING HOMOGENIZATION AND NANOINDENTATION FOR MICROFIBRIL ANGLE DETERMINATION OF SPRUCE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This paper is concerned with the evaluation of microfibril angle of spruce. The microfibril angle is defined as an inclination of microfibrils from the longitudinal axis, the direction of lumens. It is well known and further ... -
VARIATIONALLY-BASED EFFECTIVE DYNAMIC THICKNESS FOR LAMINATED GLASS BEAMS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)Laminated glass, consisting of glass layers connected with transparent foils, has found its applications in civil, automotive, or marine engineering. Due to a high contrast in layer properties, mechanical response of ... -
WANG TILE SIZE IN TERMS OF CIRCULAR PARTICLE DYNAMICS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)The main advantage of the Wang tiling concept for material engineering is ability to create large material domains with a relatively small set of tiles. Such idea allows both a reduction of computational demands and ... -
WANG TILES LOCAL TILINGS CREATED BY MERGING EDGE-COMPATIBLE FINITE ELEMENT MESHES
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)In this contribution, we present the concept of Wang Tiles as a surrogate of the periodic unit cell method (PUC) for modelling of materials with heterogeneous microstructures and for synthesis of micro-mechanical fields. ... -
WATER ABSORPTION CAPACITY COEFFICIENT AND MASS MOISTURE OF RAMMED EARTH MATERIAL
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)This article presents the development of mass moisture of rammed earth material and determines the water absorption capacity coefficient for rammed earth with illite-kaoline clay. Specimens of two prescriptions were rammed ...