Investigation of the Effect on Fatigue Life Enhancement of Rib-to-Deck Welded Joints of Orthotropic Steel Deck by Extended Peening Treatment Utilization
Abstract
1. Introduction
2. Experimental Investigation
2.1. Test Specimen Arrangement
2.2. Peening Treatment
2.2.1. Apparatus Used for Peening Treatment
2.2.2. Peening Treatment Conditions
2.3. Results of Peening Treatment
2.3.1. Residual Stress Measurement by Using Strain Gauges
2.3.2. Deformation Measurement of the U-Rib Plate by Using Silicone and Displacement Meters
2.4. Fatigue Test
2.4.1. Fatigue Test Condition
2.4.2. Fatigue Test Results
2.4.3. Observation of Fractured Surface
3. Finite Element Analysis
3.1. Numerical Simulation of Peening Treatment
3.1.1. Simulation Model
3.1.2. Simulation Cases of Peening Treatment
3.1.3. Validity of Numerical Simulation of Peening Treatment
3.2. Numerical Simulation Results
4. Conclusions
- It was found that peening treatment of both the U-rib and deck plate toes causes a deformation in the U-rib plate, i.e., peen forming.
- The fatigue test under R = 0.0 showed that the fatigue test specimens with peen forming have higher fatigue life (JSSC-A class) compared to those peened at the deck-toe only (JSSC-B class).
- Observation of the fractured surface revealed that fatigue cracks are initiated from the weld root of the deck plate side in both cases, with and without peening treatment.
- Simulation results showed that peen forming, which is reproduced by applying displacement subsequent to peening treatment simulation, can introduce about three times higher compressive residual stress at the weld root of the deck plate side than that by peening treatment to the deck-toe only. Also, the introduced compressive residual stresses around the weld root by peen forming were kept even after applying a pre-load of around 200 MPa at 5 mm away from the U-rib toe.
- Therefore, it can be concluded that peen forming, as an extended peening treatment utilization, is highly effective in enhancing the fatigue life of the weld root in OSDs.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Part (Thickness: mm) | Material | Mechanical Properties | Chemical Composition (Weight Percentage) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Yield Strength | Tensile Strength | Elongation | C | Si | Mn | P | S | Cu | Ni | Cr | Mo | Nb | V | ||
MPa | MPa | % | - | - | - | - | |||||||||
U-rib plate (6) | SM490 YB | 483 | 571 | 24 | 0.13 | 0.24 | 1.2 | 0.016 | 0.03 | - | - | - | - | 0.013 | 0.002 |
Deck plate (12) | 403 | 557 | 24 | 0.14 | 0.26 | 1.33 | 0.013 | 0.004 | 0.14 | 0.10 | 0.13 | 0.04 | 0.014 | 0.004 | |
Wire filler | NXZ-700 | 565 | 625 | 28 | 0.04 | 0.61 | 1.55 | 0.012 | 0.011 | - | - | - | - | - | - |
No. | Condition | Peening Cases ※ | Stress Range at 5 mm (MPa) | Applied Preload at 5 mm (MPa) | Throat Thickness (mm) | Nominal Stress by Equation (1) (MPa) | Number of Cycles to Failure | Remarks |
---|---|---|---|---|---|---|---|---|
1 | AW | 70 | 35 | 6.1 | 71 | Run-out | ||
119 | 60 | 6.1 | 117 | 2,659,000 | Failed | |||
2 | Peened | a | 120 | 60 | 5.7 | 140 | Run-out | |
155 | 77.5 | 5.7 | 183 | 12,009,000 | Failed | |||
3 | a | 155 | 77.5 | 5.7 | 185 | 2,242,000 | Failed | |
4 | b | 200 | 100 | 6.4 | 192 | 8,450,000 | Failed | |
5 | b | 155 | 77.5 | 5.4 | 206 | Run-out | ||
190 | 95 | 5.4 | 254 | 4,620,000 | Failed | |||
6 | b | 160 | 80 | 6.1 | 167 | Run-out | ||
200 | 100 | 6.1 | 210 | 11,794,000 | Failed | |||
7 | b | 200 | 100 | 6.0 | 219 | 800,000 | Failed | |
8 | c | 200 | 100 | 5.9 | 224 | 1,260,000 | Failed |
σInitial [MPa] | C1 [MPa] | γ1 [-] | C2 [MPa] | γ2 [-] | ||||
435 | 8971.8 | 218.65 | 12,654.88 | 106.98 | ||||
εp = 0 [1/s] | 0 | 0.005 | 0.01 | 0.025 | 0.05 | 0.075 | 0.1 | 1.5 |
σ [MPa] | 435 | 368 | 341 | 340 | 386 | 509 | 580 | 1259 |
Applied Load Level at 5 mm from the U-rib Toe (MPa) | Min. Principal Stress (MPa) | |||
U-rib | Deck Plate | |||
Case 1 | Before preloading | 409 | −211 | |
160 | 251 | −30 | ||
200 | 304 | 4.1 | ||
Case 2 | Before preloading | −847 | −680 | |
160 | −655 | −544 | ||
200 | −396 | −431 | ||
Case 3 | Before preloading | 29 | −238 | |
160 | 217 | −58 | ||
200 | 269 | −17 |
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Banno, Y.; Ahmadzai, N.; Kinoshita, K. Investigation of the Effect on Fatigue Life Enhancement of Rib-to-Deck Welded Joints of Orthotropic Steel Deck by Extended Peening Treatment Utilization. Metals 2025, 15, 753. https://doi.org/10.3390/met15070753
Banno Y, Ahmadzai N, Kinoshita K. Investigation of the Effect on Fatigue Life Enhancement of Rib-to-Deck Welded Joints of Orthotropic Steel Deck by Extended Peening Treatment Utilization. Metals. 2025; 15(7):753. https://doi.org/10.3390/met15070753
Chicago/Turabian StyleBanno, Yuki, Niamatullah Ahmadzai, and Koji Kinoshita. 2025. "Investigation of the Effect on Fatigue Life Enhancement of Rib-to-Deck Welded Joints of Orthotropic Steel Deck by Extended Peening Treatment Utilization" Metals 15, no. 7: 753. https://doi.org/10.3390/met15070753
APA StyleBanno, Y., Ahmadzai, N., & Kinoshita, K. (2025). Investigation of the Effect on Fatigue Life Enhancement of Rib-to-Deck Welded Joints of Orthotropic Steel Deck by Extended Peening Treatment Utilization. Metals, 15(7), 753. https://doi.org/10.3390/met15070753