Dezso Hegyi

Dezso Hegyi
Budapest University of Technology and Economics · Department of Mechanics, Materials and Structures

PhD

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26
Publications
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51
Citations

Publications

Publications (26)
Article
Full-text available
The technical textiles are very sensitive materials. To measure the elongation of such a material needs special care. A photographic procedure has been investigated to measure the plain elongation of textile specimens. It is especially suitable for long-term measuring programs. Some experimental results measured by the described method are publishe...
Article
Full-text available
Recent advances in noncontact strain measurement techniques and large-strain constitutive modeling of the linear low-density polyethylene film used in NASA superpressure balloons StratoFilm 420 are combined to provide a novel measurement technique for the tear propagation critical value of the J-integral. Previously these measurements required comp...
Article
Full-text available
A new double curved spatial element was developed to analyze textile structures. It has a bending resistance beside the in-plane stiffness. The element is based on a 8-node double curved membrane element 1. To find the equilibrium solution the Total Lagrange strategy is used with the dynamic relaxation method (DRM). Deformations are calculated with...
Article
Full-text available
Constitutive description of deformations in technical textiles mostly requires some highly nonlinear material law because of the interaction between the orthotropic yarns and the effect of the matrix. Phenomenological models aim to capture the overall (macro level) behaviour needed in engineering applications. This paper introduces a new, two-dimen...
Article
Climate change severely impacts the architectural heritage. Old buildings may have survived many large storms and heavy snows in the past, but extremes have increased recently. Meanwhile, the condition of historical structures gradually degrades even if they have had regular maintenance. Church towers are strongly affected: they are subject to inc...
Article
Full-text available
The present article is a review of ETFE (ethylene tetrafluoroethylene) material, with emphasis on the mechanical and fractural behaviour, considering that the material is becoming one of the most promising façades and roof materials due to its advantageous properties. This paper examines the basic chemical makeup of this copolymer and details the e...
Article
Climate change severely impacts the architectural heritage. Old buildings may have survived many large storms and heavy snows in the past, but extremes have increased recently. Meanwhile, the condition of historical structures gradually degrades even if they have had regular maintenance. Church towers are strongly affected: they are subject to incr...
Article
New Gourna, Egypt became an iconic place of mud-brick architecture in the middle of the 20th century as a result of the work of Hassan Fathy. In the dry climate of Egypt, mud-brick is an almost perfect building material, but the change in the environmental circumstances have caused damage to the structures. The present study aims to find the root o...
Article
Full-text available
In technical textile engineering, macro-level phenomenological modelling effectively describes the material’s highly nonlinear behaviour. However, existing material laws concentrate on the normal stiffness in the orthotropic yarns and simplify the shear effect because of the two orders of magnitude difference between shear and normal stiffness. Thi...
Article
Full-text available
Steel arches are widely used to support large span membrane roofs. In order to obtain a lightweight solution, these arches might be formed as a truss. Both the strength of the material and the critical load can limit the load-bearing capacity of the steel arch. Due to the out-of-plane slenderness of a large span arch, it is with utmost importance t...
Article
Full-text available
The moment resistance of beam-to-column connections is frequently utilised in steel structures. Eurocode 3 suggests the component method to analyse such connections, and it implements the equivalent T-stub method to determine the resistance of the end plate of the beam. The latter method requires tedious and concentrated work. A simplified method i...
Conference Paper
Full-text available
Started as a student research in 2011 the Membrane Detail Project focuses on the constructional detailing of membrane structures. (Membranes represent a type of load-bearing elements-stadium roofs, public covers, tents, etc. belong to this category in architectural engineering.) At the beginning the aim of the project was to categorize the structur...
Conference Paper
Full-text available
The failure of balloons made of Linear Low Density PolyEthylene (LLDPE) is investigated. The chosen film is 38 µm thick StratoFilm 420, currently used for the NASA Super-Pressure balloons [1]. The visco-elastic behaviour of the film has been extensively studied and is already accounted for in the balloon design [2, 3, 5]. The next step in the devel...
Article
Full-text available
Tartószerkezeti vizsgálatokat végeztünk az Érd-Ófaluban álló, a barokk korban épült Szent Mihály-templomon. A szerkezetileg rossz állapotban lévõ templom fedélszékét, falait és alapozását is meg kellett erõsíteni. A szerkezeti károknak egyidejûleg több oka is van: kedvezõtlen építési viszonyok, nagyobb sérülések és szakszerûtlen javítások. Jelen ci...
Article
Full-text available
We designed a post-tensioned concrete cantilever with a 6.50 m free span supported by columns for a villa near Pécs. The shape and number of the bonded strands were determined to balance the dead load of the structure by the transversal component of the prestressing force. The deflections measured on finished structure are in good agreement with th...
Article
Full-text available
On the walls and vaults of the Roman Catholic Parish Church of Zsámbék cracks have long been observed. According to the parishioners, the crack widths have widened recently and new cracks have also appeared. This may have happened due to the increased traffic of the road beside the church. In this paper we report on the structural analysis, includi...
Article
Full-text available
Új anyagtörvény kerül bemutatásra, mely fenomenológiai módon írja le mûszaki textíliák feszültség-megnyúlás viselkedését. Az anyagmodell figyelembe veszi a mûszaki textíliák két szálirányának kölcsönhatását. Hagyományosan lineáris rugalmas anyagtörvényt használunk a mûszaki textíliából készített szerkezetek analíziséhez. A régebbi számítási módszer...
Article
Traditionally linear elastic material law is used for textile membrane structures in the analysis. The capacity of the old computers was too small to deal with the complex material law together with the highly nonlinear analysis of the structure. In the last decade high number of papers were published about nonlinear material laws according to the...
Article
The dynamic relaxation method is applied to membrane analysis using an eight-node quadrilateral element. The element uses second order shape functions to approximate the geometry of the structure. The element is based on the element of Gosling and Lewis [Gosling PD, Lewis WJ. Optimal structural membranes—I. Formulation of a curved quadrilateral ele...
Article
An 8-node double-curved quadrilateral surface element is applied with the Dynamic Relaxation Method for membrane analysis. The element uses second order shape functions to approximate the geometry of the structure. Exact tensorial calculation is used to determine the exact deformation between the deformation-free state and the actual state.
Conference Paper
Full-text available
Long term deformation has a significant effect to pre-stressed membrane structures made of PVC coated polyester fibers. A procedure has been investigated to measure the behavior of the material. Photographic method is used with unique application of transformation by parametric coordinate system. The Kelvin-Voigt-creep-model combined with Maxwell-f...
Article
Full-text available
Our research can be divided into two different areas according to our main objectives. On the one hand, we made experiments to learn as much as possible about the long-term behavior of the PVC-coated polyester textile; the most commonly used material type for the construction of tents in Hungary. On the other hand, we developed a procedure for the...
Article
Full-text available
A cikk a ponyvaszerkezetek alakmeghatározási problémakörével foglalkozik. Célja bemutatni,miért van szükségünk alakmeghatározásra. Röviden ismerteti a Magyarországon és külföldön legel-terjedtebb alakmeghatározási eljárásokat. Nem a teljes algoritmusok kerülnek levezetésre, hanem azegyes módszerek mûködésének alapvetõ elemei kerülnek bemutatásra. V...

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