Fatigue life prediction of welded box girder structures

Wu, Yaozhong; Li, Weijia; Lan, Qiuhua

doi:10.1177/1687814017728838

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…Therefore, five factors are the loads applied to four air springs and the coupler. Equation (14) contains only 21 unknown quantities, so it is only necessary to extract 21 test points for analysis. To ensure that the constructed equations are solvable, it is necessary to check the independence of each equation.…”

Section: The Calculation Procedures Of the Polynomial Fitting Methodsmentioning

confidence: 99%

“…Fitting results of the dynamic stress-time history at concerned points. Bring the transfer coefficients and load-time histories into equation (14). Then, construct the polynomial fitting relationship between the input loads and stresses of concerned points, and the dynamic structural stresses of concerned points are calculated.…”

Section: The Calculation Procedures Of the Polynomial Fitting Methodsmentioning

confidence: 99%

“…Lu et al 13 used multidisciplinary methods to obtain the nominal stress of the carbody and analyzed the dynamic reliability of the carbody. Wu et al 14 used the shell element and the beam element to perform finite element analysis, obtained the stress-time history of boom girders of a concrete pump truck, and compared it with the stress-time history obtained from the lab test to verify the accuracy of results. Then, the nominal stress method and linear damage cumulative criterion were used to evaluate the fatigue of boom girders.…”

Section: Introductionmentioning

confidence: 99%

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Analysis methods of the dynamic structural stress in a full-scale welded carbody for high-speed trains

Lü

Zheng

et al. 2018

Advances in Mechanical Engineering

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The calculation of the dynamic stress of a large and complex welded carbody is the key to the fatigue design and the durability evaluation of the carbody. Adopting the advanced structural stress based on the finite element method, a new finite element transformation method between random loads and dynamic stresses is proposed to be applied in carbody for high-speed trains. The multi-axial random dynamic load spectrums of full-scale carbody are obtained by the vehicle system dynamics method, and the shell finite element model of a full-scale carbody is established. Adopting the concept of a surrogate model, the finite element transformation relationship between the random load and the dynamic structural stress at concerned points is constructed by using multidisciplinary methods to compute the dynamic stress spectrums of concerned points at the welding seam, and dynamic structural stresses are compared and validated through carbody rig-test. The analysis methods of dynamic structural stress are performed systematically for a full-scale welded structure, which provides reference methods for the fatigue durability evaluation of large-scale welded structures.

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Section: The Calculation Procedures Of the Polynomial Fitting Methodsmentioning

confidence: 99%

Section: The Calculation Procedures Of the Polynomial Fitting Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis methods of the dynamic structural stress in a full-scale welded carbody for high-speed trains

Lü

Zheng

et al. 2018

Advances in Mechanical Engineering

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“…Literature [3], [4], [5] combined finite element analysis and Krigingbased reliability methods to evaluate the probability life of mixed-mode fatigue crack extension. Wu et al determined the remaining fatigue life of a concrete pump truck concrete pumping arm using an interpolation method [6], [7]. Arsic et al conducted three-point bending experiments on an excavator boom to test fatigue crack growth [8].…”

Section: Introductionmentioning

confidence: 99%

Lifetime Reliability of Hydraulic Excavators’ Actuator

Liu,

Zeng,

Qin

et al. 2023

IEEE Access

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Due to the harsh working environment of hydraulic excavators, the actuators are subjected to high intensity and long duration, resulting in fatigue-induced cracks, fractures, and other failures, leading to work interruptions and delays, reducing the operational efficiency of the excavator. Therefore, fatigue life prediction is of great significance in improving its safety, reliability, and operational efficiency. The load-time history at each articulation point of the working mechanism is the basis for fatigue life prediction. Due to the complex and variable forces experienced during the excavation process, it is difficult to obtain the working load spectrum through direct measurement, which can provide a more realistic prediction of the fatigue life. In this study, the excavation process of different materials under different working conditions of the excavator is studied to obtain a more accurate load spectrum and complete the life prediction of the working mechanism based on the discrete element principle. Taking the hydraulic excavator's actuators as the research object, the load spectrum of each articulation point under extreme conditions such as eccentric load and impact is obtained for different excavation materials, and the minimum life prediction of the boom is completed. Genetic algorithm (GA) and Self-Adaptive Fast Fireworks Algorithm (SF-FWA) are used for life prediction, and function fitting is performed using historical failure data for life calculation and comparative analysis. The analysis shows that SF-FWA is more effective than GA. The advanced algorithm provides more accurate predicted values for estimating fatigue life, but less accurate for estimating MTBF.

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