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assessing the acceptability of flaws in metallic structures, Londyn: BSI, 2005. 13. NORSOK STANDARD, M-101, Structural steel fabrication, Lysaker: Standards Norway, 2011. 14. Polish Committee for Standardisation, PN-EN ISO 15653:2010 Metallic materials – Test method to determine quasi-static brittle fracture toughness of welds (in Polish), Warsaw: Polish Committee for Standardisation, 2010. 15. Dassault Systèmes, Abaqus 6.14 Documentation, Providence, RI: Dassault Systèmes, 2014.

Requirements W11: Normal and higher strength hull structural steels. Rev. 2004. Guidelines for the inspection and maintenance of double hull tanker structures. TSCF 1995. TÜV Austria: Corrosion testing of ships. CORRSHIP Project of 5 th FPEU, 2003-2006. Vallen Systeme GmbH: AMSY5 Specification. The Acoustic Emission Company. Icking, Germany. Eliasson J.: Economic of coating/corrosion protection of ships selecting the correct type of anticorrosion protection for underwater applications on new buildings. Lloyd's List events Conference "Prevention and Management of

Abstract

This paper discusses the influence of the Tvergaard parameters, qi, which are basic constants of the Gurson-Tvergaard-Needleman (GTN) material model, on the numerically simulated load-carrying capacity of tensile elements made of S235JR steel. The elements were considered to be under static tension at low initial stress triaxiality σme = 1/3. Two sets of the Tvergaard parameters qi were analyzed: those typical of structural steels and those dependent on material strength properties. The results showed that the Tvergaard parameters, qi, had influence on the load-carrying capacity of tensile elements at low initial stress triaxiality. They affected the strength curves and the changes in the void volume fractions determined for S235JR steel elements

fatigue life of machine elements (in Polish), University of Technology and Agriculture, Bydgoszcz 1989. 6. Szala G., Ligaj B., Description of cyclic properties of steel in variability conditions of mean values and amplitudes of loading cycles, Materials Science Forum, Fatigue Failure and Fracture Mechanics, Vol. 726, 2012, pp. 69-76. 7. Szala G., Theoretical and experimental analysis of twoparametric fatigue life characteristics of structural steels (in Polish), 1st part of the monograph titled: Twoparametric fatigue life characteristics of structural steels and their

., Blom R.: Development of a method for corrosion fatigue life prediction of structurally loaded bearing steel. Corrosion, 2001, Vol. 57, No.5, pp.404-412 17 18. Qian Y.R., Cahoon J.R.: Crack initiation mechanisms for corrosion fatigue of austenitic stainless steel. Corrosion, 1997, Vol.53, No.2, pp.129-135 18 19. Ahin S.-H. Lawrence Jr. F.V., Metzger M.M.: Corrosion fatigue of an HSLA steel. Fatigue & Fracture of Engineering Materials & Structures, 1992, Vol.15, pp.625-642 19 20. Boukerrou A., Cottis R.A.: Crack initiation in the corrosion fatigue of structural steels

. Fatigue Engng Mater, Struct, 5, 223-232. 5. Lankford J. (1982) The growth of small fatigue cracks in 7075 aluminium. Fatigue Engng Mater. Struct, 5, 233-248. 6. Jakubowski M. (2007). A model of corrosion fatigue crack growth in ship and offshore steels. Fatigue Fract. Engng Mater. Struct., 30, 682-688. 7. Scott P. M., Silvester D. R. V. (1975). The influence of seawater on fatigue crack propagation in structural steel. Department of Energy, UK OSRP Technical Report 3/03. 8. Morgan H. G., Thorpe T. W. (1981). An introduction to crack growth testing in the UK OSRP and its

embrittlement of 30HGSNA aircraft steel in Cl - containing environments , Proc. Int. Conf. on Environmental Degradation of Engineering Materials, 19-23 Sept. 1999, Gdansk-Jurata, Poland, Vol. I, pp. 334-339 K. Pokhodnya, V. I. Shvachko, S. M. Stepanyuk: Experimental modeling of cold cracking of structural steels and welds , Proc. Int. Conf. on Environmental Degradation of Engineering Materials, 19-23 Sept. 1999, Gdansk-Jurata, Poland, Vol. I, pp. 351-356 A. Zieliński, P. Domżalicki: Hydrogen degradation of high-strength low-alloyed steels , J. of Materials Processing

report, 2002 Roland F., Metschkow B.: Laser Sandwich Panels for Shipbuilding and Structural Steel Engineering. Meyer Werft, Papenburg, 1997 Romanoff J., Varsta P.: Bending response of web-core sandwich plates. Composite Structures 81 (2007) Samluk J.: Numerical analysis of angular sandwich-sandwich panel connection. M. Sc. Thesis, Gdansk University Technology, Faculty of Ocean Engineering and Ship Technology, 2008, unpublished Tat-Ching Fung et al : Shear Stiffness for C-core Sandwich Panels. Journal of Structural Engineering. August 1996 Lok T. S., Cheng O. H

References 1. Bielański J.: Description of the hydrodynamic pressure field function around the ship hull, Hydroacoustics, Vol.14, pp. 17-22, Gdynia 2011. 208 2. Ferrolabs, Inc. · Sterling, VA United States, http://www.ferrolabs.com/. 2010, company catalogue. 3. GASIAK, G., PAWLICZEK, R.: Fatigue strength of structural steel in non-symmetrical load conditions (in Polish). Zeszyty Naukowe Mechanika, Opole University of Technology, Vol. 74, pp., 25-41, Opole 2002. 4. Guo, C., Feng, S.: Sealing mechanism of magnetic fluids. Journal of Shanghai University (English

North Carolina: 1998. 19. Chong, P.C., Pyo, Y.D., Jin, Y.J.: NOx, reduction and N 2 O emissions in a diesel engine exhaust using Fe-zeolite and vanadium-based SCR catalysts. Applied Thermal Engineering, 2017, 110, Pp. 18-24. 20. De’nan, F., Hasan, H., Choong, K.K.: The efficiency of structural steel section with perforated-corrugated web profile subjected to shear loading condition. Engineering Heritage Journal, 1(1), Pp. 29-35. 21. Hassan, S.R., Zaman, N.Q., Dahlan, I.: Influence of Seed Loads on Start Up of Modified Anaerobic Hybrid Baffled (MAHB) Reactor Treating