Fatigue Life Calculation of High-Strength Steel Perforated Plates

JIN Hui; WANG Wanzhen

doi:10.3724/j.gyjzG23040703

Volume 55 Issue 3

Mar. 2025

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JIN Hui, WANG Wanzhen. Fatigue Life Calculation of High-Strength Steel Perforated Plates[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 134-141. doi: 10.3724/j.gyjzG23040703

Citation:

JIN Hui, WANG Wanzhen. Fatigue Life Calculation of High-Strength Steel Perforated Plates[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 134-141. doi: 10.3724/j.gyjzG23040703

JIN Hui, WANG Wanzhen. Fatigue Life Calculation of High-Strength Steel Perforated Plates[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 134-141. doi: 10.3724/j.gyjzG23040703

Citation:

JIN Hui, WANG Wanzhen. Fatigue Life Calculation of High-Strength Steel Perforated Plates[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 134-141. doi: 10.3724/j.gyjzG23040703

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Fatigue Life Calculation of High-Strength Steel Perforated Plates

doi: 10.3724/j.gyjzG23040703

JIN Hui¹,
WANG Wanzhen^{2
,
,}

1. College of Urban Construction, Zhejiang Shuren University, Hangzhou 310015, China;
2. School of Civil &Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China

Received Date: 2023-04-07
Available Online: 2025-06-07
Publish Date: 2025-03-20

Abstract

Abstract

According to the failure modes of perforated plates fabricated from Q460D steel and Q690D steel in the fatigue test， taking an ellipsoidal fracture model as the instability propagation （fracture） criterion of fatigue cracks， the instability propagation area， the area and the length of initiation and stable propagation of fatigue cracks were theoretically calculated. Taking the ellipsoidal fracture model as the cracking criterion of crack tips， the propagation of fatigue cracks in perforated plates fabricated from Q460D steel and Q690D steel with elliptical cylinder fatigue crack was numerically simulated. The numerical calculation of stress field of fatigue crack propagation showed that the peaks of the relative stresses （σ₁/f_y，σ₂/f_y，σ₃/f_y）， stress triaxiality σ_m/σ_seq and cracking index I_c were located at the crack tips with high stress concentration. The unstable propagation area of fatigue cracks was fully plastic， and the average cracking index I_c≈1.0. The stress constraint coefficient along the width of the plate was about 0.28， and there was almost no constraint stress along the thickness of the plate. According to the experimental fatigue life of perforated plates fabricated from Q460D steel and Q690D steel，and the fatigue crack initiation and stable propagation length calculated numerically， the parameters of the fatigue life calculation model which uniformly calculated the fatigue crack initiation and stable propagation life were calibrated. The calculation results of the fatigue life of perforated plates fabricated from Q460D steel and Q690D steel showed that the fatigue life of the perforated plates increasesd with the increase of the strength of structural steel， and different quantitative fatigue life calculation models should be adopted for the perforated plates fabricated from high-strength steels with different strength grades. The fatigue life calculation formula with the same allowable stress amplitude recommended in China’s current code was adopted to calculate the fatigue life of the perforated plates fabricated from Q460D steel and Q690D steel. The calculation error of the fatigue life formula with allowable stress amplitudes recommended in China’s current codes was -76.2%--14.3%. The calculation error of the fatigue life calculation model which uniformly calculated the fatigue crack initiation and stable propagation life was -61.8%--0.01% and the calculation accuracy was higher than that of the fatigue life calculation formula with the same allowable stress amplitude recommended in China’s current codes.
- high-strength steel,
- perforated plate,
- fatigue life,
- fatigue crack,
- general fatigue life calculation model

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References(26)

References

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