Volume 26 Issue 5
Oct.  2011
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CHEN Li-zhi, ZHANG Ya-jun. Research on Low Temperature CTOD Fracture Toughness and da/dN Properties of S355N and S355N-Z25 Structural Steel Plate[J]. Development and Application of Materials, 2011, 26(5): 42-44,48. DOI: 10.19515/j.cnki.1003-1545.2011.05.010
Citation: CHEN Li-zhi, ZHANG Ya-jun. Research on Low Temperature CTOD Fracture Toughness and da/dN Properties of S355N and S355N-Z25 Structural Steel Plate[J]. Development and Application of Materials, 2011, 26(5): 42-44,48. DOI: 10.19515/j.cnki.1003-1545.2011.05.010
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Research on Low Temperature CTOD Fracture Toughness and da/dN Properties of S355N and S355N-Z25 Structural Steel Plate

  • 1. Troops 91287, People's Liberation Army, Shanghai 200083, China;

  • 2. Luoyang Ship Material Research Institute, Luoyang 471023, China

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  • Received Date: May 03, 2011
  • Available Online: March 28, 2024
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  • Adopting three-point bend SE(B) and compact tensile C(T) specimen,through crack-tip opening displacement CTOD fracture toughness test at-20℃ and fatigue crack propagation rate da/dN test,resistance to crack initiation and propagation of S355N and S355N-Z25 structural steel plates were studied.The results manifested that S355N steel is stronger in resistance to crack initiation and prophase growth than S355N-Z25 steel,but is weaker to crack anaphase propagating.When stress strength factor ΔK is less than 34.3MPa·m,S355N steel has less fatigue resistance than S355N-Z25 steel.When ΔK equals 34.3MPa·m,both have the same fatigue resistance.When ΔK is more than 34.3MPa·m,the former has stronger fatigue resistance than the latter.These information may provide reference for the steels as used in safety-assessing of engineering structure.
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