Fatigue properties of welded Q420 high strength steel at room and low temperatures

Li, Ziran; Zhang, Dachang; Wu, Haijun; Huang, Fei; Hong, Wan; Zang, Xiangsheng

doi:10.1016/j.conbuildmat.2018.07.231

Cited by 25 publications

(9 citation statements)

References 12 publications

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“…By means of statistical assessment, a correlation between test temperature and fatigue life is verified for the majority of weld details and steel types. This result is in line with studies on FCG rate testing of base materials as well as S-N fatigue tests of welded joints at sub-zero temperatures ( [7,10,12,[15][16][17]).…”

Section: Discussionsupporting

confidence: 90%

“…While effects of high temperatures on material behavior are well covered in international standards and guidelines, there is no comprehensive guidance for sub-zero temperature fatigue strength assessment of welded joints. This is likely related to the small number of publications concerning fatigue of welded steel joints at sub-zero temperatures, see [6][7][8][9][10][11][12][13][14][15][16][17]. Moreover, the majority of studies focuses on fatigue crack growth (FCG) rate testing for cryogenic applications and butt-welded joints.…”

Section: Introductionmentioning

confidence: 99%

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Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Braun

2021

Weld World

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Ships and offshore structures in Arctic environments are exposed to severe environmental actions and sub-zero temperatures. Thus, the design of such structures has to account for the Arctic environment and must be cost-efficient at the same time. A vital part of the design process is to ensure that fatigue-induced failure does not occur in the lifetime of the structure. While effects of high temperatures on material behavior are well covered in international standards and guidelines, there is no comprehensive guidance for sub-zero temperature fatigue strength assessment. Additionally, stress-life (S–N) test data of welded joints at sub-zero temperatures is particularly scarce. Hence, this study presents an extensive review of recent test results of various weld details tested in the range of − 50 to 20 °C. This data could build the basis for future considerations of temperature effects in fatigue design guidelines and recommendations. For this purpose, the fatigue test results are submitted to a rigorous statistically assessment—including a summary of the limitations of current design guidelines with respect to sub-zero temperature effects.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Braun

2021

Weld World

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“…This was observed by Yan et al, 8 who tested the mechanical properties of 63 steel coupons under low temperatures in the range of −165°C to 20°C and found that the yield and ultimate strength of HRB335, HRB400, and SLTS type of reinforcing steels increased with the decrease of temperature. The same observations for Q420 high-strength steel were also validated by Li et al, 9 who performed tensile tests of welded joints under normal and low temperatures. On the basis of these test results, Liu et al 10,11 studied the mechanical properties of welded joints under low temperatures in the range of −60°C to 20°C and observed that their yield-to-ultimate strength ratio increased slightly with temperature decrease.…”

Section: Introductionsupporting

confidence: 73%

Experimental research on bolted joint strength and dispersion in steel lattice transmission tower legs under low temperatures (−20°C to −45°C)

Jiang

Zhang³

et al. 2019

Fatigue Fract Eng Mat Struct

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Cold regions with subzero temperatures (−20°C to −45°C) have important impacts on the mechanical properties of structural steel used in lattice steel towers of overhead transmission line systems. The results from regular material tests are not appropriate for the accurate analysis of joint strength in cold weather conditions. This paper presents the tensile test results of 18 coupons of steel material and eight groups (18 specimens per group) of bolted joints with Q345 and Q420 steel under temperatures of 20°C, −20°C, and −45°C. The results show that the yield‐to‐ultimate strength ratio of the joints under low temperature conditions is beyond the range of 0.60 to 0.75 for Q420 structural steel. Suggestions are made on how to improve the accuracy of joint design for both the partial resistance factor and the design value of joint yield strength in cold regions.

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“…If a building does not collapse during a fire, the post-fire evaluation and repair of the fire-exposed building require better understanding and awareness of the post-fire performances of its construction materials. Extensive research works were conducted in last decades to study the post-fire behaviour of different types of structural steels including high strength steels, hot-rolled and cold-formed steels, duplex stainless steels, marine steels and so on (Azhari et al, 2017; Chiew et al, 2014; Gunalan and Mahendran, 2014; Hai et al, 2018; Huang and Young, 2018; Kang et al, 2018b; Li et al, 2017, 2018a, 2018b; Liu et al, 2017; Lu et al, 2016; Maraveas et al, 2017a, 2017b; Qiang et al, 2012, 2013; Ren et al, 2020; Sajid and Kiran, 2019; Wang et al, 2015, 2020b; Xie et al, 2018; Yahyai et al, 2016; Yan et al, 2014; Zhang et al, 2020). However, research works on the post-fire performance of Grade 460 HSS, one of current most commonly used HSS with a nominal yield strength of 460 MPa, are still very limited.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on post-fire mechanical performances of high strength steel Q460

Kang

Liu

et al. 2021

Advances in Structural Engineering

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A series of experimental tests for investigating the post-fire mechanical (PFM) and post-fire fracture (PFF) performances of high strength steel Q460 are reported in this paper. All Q460 coupon specimens are heated up to a designated temperature which is selected from 100 to 900°C and then cooled down naturally to room temperature. Tensile tests are conducted to obtain their completely full-range post-fire stress-strain curves and the corresponding mechanical properties. The obtained experimental results show that with an increase in the heating temperature, the post-fire yield strength and ultimate strength of the Q460 structural steel decrease particularly when the heating temperature is over 650°C, but the post-fire elongation enhances. Ductile fracture behaviour of the coupon specimens under axial tensile loading can also be observed through the tensile coupon tests. The obtained experimental data are compared with the other results found in the open literatures on Grade 460 high strength steel. Based on a wider range of experimental data sets, predictive equations for evaluating the PFM properties of Grade 460 high strength steel are proposed. The experimental results presented in this study will provide benchmark data for the future calibration of complex ductile fracture parameters applied in numerical simulation.

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Fatigue properties of welded Q420 high strength steel at room and low temperatures

Cited by 25 publications

References 12 publications

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Statistical analysis of sub-zero temperature effects on fatigue strength of welded joints

Experimental research on bolted joint strength and dispersion in steel lattice transmission tower legs under low temperatures (−20°C to −45°C)

Experimental study on post-fire mechanical performances of high strength steel Q460

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