Wyniki wyszukiwania - BazTech

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Synergistic performance degradation of marine structural elements: case study of polymer-based composite and steel hybrid double lap joint

Baykal Halis Haluk, Neser Gokdeniz

Polish Maritime Research

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2023

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nr 3

111--118

EN

The degradation of structures under the influence of a marine environment tends to be rapid and disruptive compared to that of structures that are far away from these influences. Efforts to consider these impacts in the design phase are increasing, with a view to the construction of more sustainable structures. However, experimental data from which designers and builders can benefit cannot be found in the relevant literature, especially when it comes to the effects of composite degradation. In this study, we experimentally investigate the combined effects of degradation factors such as a drying-wetting cycle, the shape of the structure, the variety of materials used in the structure, and the differences in the manufacturing of the materials . The structure chosen as an example is a hybrid structural double lap joint composed of epoxy resin, fibreglass composite, and steel, which is widely used in ship structures. The experiments considered four aging periods (zero, 30, 60 and 90 days) under a wet-dry cycle in a programmable corrosion chamber, two overlap lengths (short and long), two surface roughnesses of the steel parts (50 and 90 μm), and two surface preparation alternatives (uncoated and coated with epoxy primer). The synergistic effects of these parameters on the tensile strength, deformation and toughness of the joints were evaluated, and suggestions are made for ship designers. The attention of interested parties, and particularly ship designers, is drawn to the comparative effects of these degradation agents on performance.

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Badania eksperymentalne stalowych zakładkowych połączeń na śruby z iniekcją

Woźniczka Piotr

Inżynieria i Budownictwo

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2023

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R. 79, nr 9-10

498--502

PL

Przedstawiono wybrane wyniki badań doświadczalnych stalowych zakładkowych połączeń na śruby z iniekcją. Przeprowadzone badania obejmowały swoim zakresem 9 połączeń na śruby M16 kI. 8.8. Próbki zostały wykonane zgodnie z zaleceniami normy PN-EN 1090-2. Do wykonania iniekcji wykorzystano dwuskładnikowy żelkot epoksydowy o deklarowanej przez producenta wytrzymałości na ściskanie wynoszącej 110-120 MPa. Analizowane połączenia poddano oddziaływaniom obciążeń krótko oraz długotrwałych. Uwzględniono również wpływ wielkości otworów na nośność połączenia. Na podstawie przeprowadzonych badań eksperymentalnych wyznaczono wartości średnie oraz współczynniki zmienności nośności danego typu połączenia. Otrzymane wyniki badań eksperymentalnych porównano z wynikami obliczeń prowadzonych zgodnie z normą PN-EN 1993-1-8.

EN

Selected results of experimental tests of steel double-Iap shear joints with resin-injected bolts are presented. The test carried out covered 9 specimens with M16 class 8.8 bolts. Specimens were made in accordance with the PN-EN 1090-2 standard. Two-component epoxy gelcoat resin was used for the injection. Compressive strength of the resin declared by the manufacturer is equal to 110-120 MPa. The analyzed joints were subjected to short-term and long-term loads. The influence of the size of the bolt holes on the load capacity of the joint was also taken into account. Based on conducted research, the mean values and coefficients of variation of the load capacity of analyzed joint type were determined. The results of experimental tests were compared to the results of calculations carried out according to the PN-EN 1993-1-8 standard.

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Experimental and Theoretical Investigation of Galvanized Steel and Fiber-Reinforced Polymer Composites Textile Adhesive Double Lap Joints

Dybizbański Maciej Adam, Rzeszut Katarzyna

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

110--120

EN

This paper presents an experimental analysis of CFRP fabric to galvanized steel adhesive connection. An experimental research has been conducted on the adhesive connection between CFRP fabric and galvanized steel subjected to shear forces. The specimens were made from the steel plates overlapped on both sides with SikaWrap 230 C fabric using SikaDur 330 adhesive. Observations of natures of failure for CFRP-Steel adhesive connection were conducted based on visual inspection using a scanning microscope. Mixed nature of the connection failure was specified. Moreover, an advanced numerical model has been developed and later on validated and verified on the basis of performed original laboratory tests. Ultimately, final conclusions were drawn based on the advanced numerical model that has been developed, verified and validated using laboratory tests results, as well as analytical models and nature of the connection failure was specified.