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Corrosion fatigue of steel L485MB
Gajdoš, Lubomír ; Šperl, Martin ; Brož, P.
To assess the resistance of a high-level steel L485MB to corrosion fatigue its fatigue properties were investigated in air, acidic corrosive medium, alkaline corrosive medium, and the fresh water.
Cooperation at the solutions of development of multiplier for pressure to 450 MPa
Gajdoš, Lubomír ; Šperl, Martin
Realization of this work: application of computing methods for considerations of stress state and long time cyclic strength, consultations of the technological process of producing.
Škody na fasádních deskách - teorie a experimentální ověřování
Kratěna, Jindřich ; Šperl, Martin ; Urushadze, Shota
The facade of a multi-storey building was clad with Cembonit cladding sheets installed in the Autumn of 2003. In the Summer of 2004 the first destruction of these cladding sheets took place particularly on the southern face of the building. Further destructions took place in the Summer of 2005. The cause of damage was investigated and ascertained both theoretically and experimentally.
Vliv koroze pod napětím na lomovou houževnatost oceli
Gajdoš, Lubomír ; Šperl, Martin
This work was aimed at the application of fracture mechanics approach to assessment of the reliability of structures containing stress corrosion (SC) cracks.
Korozně únavové poškození vysokopevné potrubní oceli L485MB
Gajdoš, Lubomír ; Šperl, Martin
Aim is to assess the degree of degradation of fatigue properties of L485MB steel (ArcelorMittal Ostrava) in corrosive environment in comparison with normal fatigue properties.
The Effect of Overloading of Pipes on their Fracture Toughness in Relation to the Strength Grade of Steel
Šperl, Martin ; Gajdoš, Lubomír
The present experimental results showed a very positive effect of a controlled overloading of a pipeline on its fracture toughness. These results have been referred to steels of the class L360MB and L415MB. However, more recent results obtained on L450MB steel indicated that the positive effect of oveloading is reduced as the strength properties of steels are increased. It follows from this that the final technological operation of overloading of pipes made from steels of an increased strength could be let out from the pipe manufacture scheme. The paper presents experimental results which prove by evidence a decreasing positive effect of overloading on the fracture toughness of steels of high strength properties.
Fatigue analysis of defects in pipe welds from view of position and geometry
Němec, Jaroslav ; Šperl, Martin
The effect of the weld root appeared to be much more unfavourable than the effect of the weld cap.
Fracture properties of pipes from steel 11378 for high-pressuregas pipelines
Gajdoš, Lubomír ; Šperl, Martin
Final operation - overloading by internal pressure of water - inmanufacturing pipes for high-pressures increase the mean valueof fracture toughness and reduces directional scatter of measured values.
The Analysis of the Most Important Directions of the Research into Welded Pipes for High Gas Pressures
Gajdoš, Lubomír ; Micka, Michal ; Šperl, Martin
The analysis of the most important directions of the research into welded pipes for high gas pressures.
The effect of technology of manufacturing gas linepipes on their fracture properties
Gajdoš, Lubomír ; Šperl, Martin
Are presented and discussed results of experimental investigaton of changes in mechanical and fracture mechanical properties of the material of a spiral-welded gas line pipe /360MB) during the manufacture of the pipe.

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1 Šperl, Milan
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