Wyniki wyszukiwania - BazTech

1

Stress–strain relationship of ductile materials and flexural behavior of ductile over-reinforced concrete beams

Duhaim Hussein M., Mashrei Mohammed A.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

|

2022

|

Vol. 31, No. 4

225--237

EN

This paper aimed to investigate the effect of using ductile materials in the compression zone on the flexural performance of over-reinforced concrete beams. In order to avoid brittle compression failure, partial replacement of concrete with ductile materials layer in the compression zone was used. Four over-reinforced concrete beams of size 120 × 180 × 1,300 mm were cast and tested under three-point loading conditions. The steel fibers reinforced concrete (SFRC), slurry infiltrated fiber concrete (SIFCON), and ultra-high performance fiber reinforced concrete (UHPFRC) were used as ductile materials. The flexural capacity of the beams, failure modes, crack patterns, load-deflection relationships, ductility index, and toughness were investigated. The results showed that using ductile materials in the compression zone is an effective technique to increase the ultimate load, ductility, and toughness by up to 52.46, 84.78 and 279.93%, respectively, compared to the reference beam. In addition, the failure mode changed from brittle to ductile failure. Noting that the use of SFRC layer enhanced the ductility of over-reinforced concrete beams more than using UHPFRC and SIFCON layers. Also, one of the main advantages of this technique is led to increase the tensile reinforcement ratio up to 8.548% without needing the compressive reinforcement. Thus, ductile composite beams with a high flexural capacity were generated using an economical amount of ductile materials.

2

Modelowanie numeryczne procesu wykrawania - nowe możliwości w prognozowaniu jakości geometrycznej wykrojek

Kut S.

Mechanik

|

2009

|

R. 82, nr 10

801-804

PL

Możliwości w modelowaniu numerycznym procesu wykrawania z uwzględnieniem fazy ciągliwego pękania. Modele pękania materiałów ciągliwych w procesach technologicznych. Wizualizacja trajektorii rozdzielenia materiału w aspekcie prognozowania jakości geometrycznej wyrobów. Przykładowe wyniki modelowania uzyskano poprzez zaimplementowanie do komercyjnego systemu MSC. MARC autorskiego podprogramu, umożliwiającego modelowanie fazy ciągliwego pękania w oparciu o tzw. wskaźnik wykorzystania odkształcalności. Porównanie wyników modelowania z eksperymentem.

EN

Capacities provided by numerical modeling of blanking process with consideration given to the ductile cracking phase. Models of cracks in ductile materials occurring in production processes. Visual presentation of the material separation trajectory in the aspect of forecasting geometrical quality of a component. Exemplary models are compared against the experiment results.

3

Failure criteria for electromagnetic materials

Chudzicka-Adamczak M.

Vibrations in Physical Systems

|

2006

|

Vol. 22

101--106

4

On importance of imperfections in plastic strain localization problems in materials under impact loading

Glema A., Łodygowski T.

Archives of Mechanics

|

2002

|

Vol. 54, nr 5-6

411-423

EN

The work is the continuation of Professor Piotr Perzyna achievements in the description and analysis of the phenomenon of plastic strain localization. The ductile materials under impact loading are in focus of interest. In particular, the influence of initial imperfections on the final pattern of localization is elaborated. The computer simulations were performed in the environment of ABAQUS program.