Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry—Assessment Based on the Instrumented Impact Test

Maślak, Mariusz; Pazdanowski, Michał; Stankiewicz, Marek; Zajdel, Paulina

doi:10.3390/ma14143922

Cited by 6 publications

(6 citation statements)

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“…This in turn induced higher susceptibility to brittle fracture. These conclusions seem to be in complete agreement with results of earlier research conducted by the authors, reported in the papers [6][7][8].…”

Section: Results Obtained On Samples Made Of S355j2+n Steelsupporting

confidence: 93%

“…In particular, it is not so much about the a posteriori observation of the complete lack of susceptibility to initiate brittle cracks in the tested material, but about the observed post-fire loss of the capability to effectively arrest the unrestrained growth of such cracks. This paper constitutes a continuation of previous works published earlier in [6][7][8].…”

Section: Introductionsupporting

confidence: 55%

“…In the previous paper [7], we showed how the post-fire brittleness of the material is assessed based on the shape of the F-s curve obtained during the impact strength test under the assumption of specific (summer or winter) weather conditions. The evaluated pattern has to be related to the analogous pattern associated with the limit value of the fracturing energy W t,min = 27 J, for which the ductile-to-brittle transition temperature (DBTT) is defined.…”

Section: Parameters Of the Observed Impact Fractures Used To Draw Con...mentioning

confidence: 99%

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Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

et al. 2023

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The results of experimental research on forecasting post-fire resistance to brittle failure of selected steel grades used in construction are presented and discussed in this paper. The conclusions are based on detailed analysis of fracture surfaces obtained in instrumented Charpy tests. It has been shown that the relationships formulated based on these tests agree well with conclusions drawn based on precise analysis of appropriate F–s curves. Furthermore, other relationships between lateral expansion LE and energy Wt required to break the sample constitute an additional verification in both qualitative and quantitative terms. These relationships are accompanied here by values of the SFA(n) parameter, which are different, depending on the character of the fracture. Steel grades differing in microstructure have been selected for the detailed analysis, including: S355J2+N—representative for materials of ferritic-pearlitic structure, and also stainless steels such as X20Cr13—of martensitic structure, X6CrNiTi18-10—of austenitic structure and X2CrNiMoN22-5-3 duplex steel—of austenitic-ferritic structure.

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Section: Results Obtained On Samples Made Of S355j2+n Steelsupporting

confidence: 93%

Section: Introductionsupporting

confidence: 55%

Section: Parameters Of the Observed Impact Fractures Used To Draw Con...mentioning

confidence: 99%

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Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

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“…Permanent girder deformations measured after completion of experiments (after cooling phase) are listed in Table 5 in turn. Post-fire properties of steels subjected to rapid heating and then cooling are discussed in [29,30]. 5.…”

Section: Results Of Experimental Research At Fire Temperature and Their Comparison With Computer Simulationsmentioning

confidence: 99%

Experimental Study of Lateral-Torsional Buckling of Class 4 Beams at Elevated Temperature

Woźniczka

2021

Materials

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The results of experimental research on lateral-torsional buckling of steel plate girders with slender web subjected to fire conditions are presented in this paper. The scope of the research covers four girders, three of which have been tested under high temperature conditions. The fourth girder has been used to determine the critical load resulting in lateral-torsional buckling of the considered element at room temperature. All the considered elements had identical cross sections and lengths; however, they differed in external temperatures applied and magnitude of measured geometrical imperfections. It has to be highlighted, that the experiments have been conducted subject to the anisothermal conditions, taking into account the uneven distribution of temperature in the cross section. An approach of this type represents a more accurate modelling of the structural component behaviour, when subjected to fire, as compared to the experiments conducted under isothermal conditions. Complete information on the development of research stand, conduct and results of particular tests are presented in this paper. The temperature–time curves for girder components, results of imperfection measurements and mechanical properties of steel are presented. The obtained critical temperatures and graphs of girder top flange horizontal deflection versus temperature are also included. The computer models developed for analysed girders are described in the paper as well. The results obtained with these models have been compared with experimental results. The computational models validated in this way constitute a basis for further parametric studies of lateral-torsional buckling in the domain of steel plate girders with slender web when subjected to fire conditions.

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“…Chaotic heating of steel during the fire followed by more or less rapid cooling, depending on whether the firefighting action had been conducted, and if yes then how was it conducted, may generate permanent changes in the material structure [2]. These changes affect the suitability of the material for extended service after surviving a fire incident [3], and its capability to safely resist the loads applied to it. Therefore verification of steel brittleness, regardless of the grade applied in practice, should, according to the Authors' opinion, be unconditionally included in the conventional set of tests conducted a'posteriori on a building object under scrutiny after surviving an a'priori fire episode.…”

Section: Introductionmentioning

confidence: 99%

Testing of Post‐fire Brittleness for Certain Standard Duplex and Lean Duplex Stainless Steel Grades

Maslak,

Pazdanowski,

Stankiewicz

et al. 2023

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The results of post‐fire brittle cracking susceptibility tests conducted on samples made of selected duplex type stainless steel grades exhibiting austenitic‐ferritic structure, in particular on standard duplex X2CrNiMoN22‐5‐3 steel and on lean duplex X2CrMnNiN21‐5‐1 steel, are presented and widely discussed. General conclusions are based on the force‐displacement graphs obtained by the instrumented Charpy impact test. Prior to the test all samples have been subjected to simulated fire action following the steady‐state heating regime and then cooled down to room temperature. Two heating levels have been considered, namely 600°C and 800°C. The first of these levels has been considered as to low, while the second as sufficiently high, to induce in the considered steel structural changes of permanent character. For comparison, two groups of samples have been tested. Samples belonging to the first group have been heated for one hour (simulation of a short fire), while the ones belonging to the second group have been heated for ten hours (simulation of a long fire). In addition, two alternative cooling modes have been considered, i.e. slow cooling in the muffle furnace and rapid cooling in water mist. The toughness tests on samples made of both steel grades have been conducted at two different temperature values, that is at +20°C to simulate the continued service in summer conditions and at ‐20°C to simulate this future service in winter conditions.

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Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry—Assessment Based on the Instrumented Impact Test

Cited by 6 publications

References 23 publications

Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

Impact Fracture Surfaces as the Indicators of Structural Steel Post-Fire Susceptibility to Brittle Cracking

Experimental Study of Lateral-Torsional Buckling of Class 4 Beams at Elevated Temperature

Testing of Post‐fire Brittleness for Certain Standard Duplex and Lean Duplex Stainless Steel Grades

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