Fatigue crack growth prediction model under variable amplitude loading conditions

Li, Menghan; Liu, Xin; Li, Zhenguo; Zhang, Yingbo

doi:10.1177/1056789521998737

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…For the complex eight-step loading containing varying loading paths applied It must be pointed out here that the experimental results employed above mainly refer to crack initiation life. During the crack growth phase, fatigue damage mechanism could be fully different due to the interaction of crack tip plastic zones and the crack growth retardation effects (Li et al, 2021). When a higher estimation accuracy is required, the dissipation of the plastic energy near the crack tip and the parameters describing the evolution of crack plastic zones should be introduced into the proposed model.…”

Section: Eight-step Loading Conditionmentioning

confidence: 99%

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Gan

Zhong

2022

International Journal of Damage Mechanics

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Accurate estimation of remaining fatigue life is crucial to assess the structural durability and reliability of engineering components. For this purpose, an energy-based model is proposed in this paper for modeling the process of fatigue damage accumulation under multistep loading. To account for the effects of loading sequence and load interaction, two parameters, a concept of normalized fatigue driving energy (NFDE) and a load interaction factor, are introduced in the model. The former is based on variable energy-life curves and the latter is formulized as an exponential function of the loading intensity ratio and the number of loading cycles. The implementation procedure of such model only requires the loading information and materials’ basic fatigue properties. Moreover, extensive experimental results of six metallic materials under two-, four- and eight-step loadings with different loading sequences are employed for model comparative study. The results indicate that, compared with several existing damage models, the proposed model can provide better remaining fatigue life estimations under multistep loading.

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Section: Eight-step Loading Conditionmentioning

confidence: 99%

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Gan

Zhong

2022

International Journal of Damage Mechanics

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“…Nagarajappa, N. predicted the fatigue crack growth behavior for a standard load spectrum (13). Li Menghan proposed a residual fatigue life prediction model for crack growth without considering different stress ratios (14). Bingjie Xiao determined that the crack number density theory could be used as an effective tool for life prediction (15).…”

Section: Introductionmentioning

confidence: 99%

Research on fatigue vulnerable details of cross beam joints after reinforcement for steel truss bridges

Jinhua,

Youwei,

Yueguang

et al. 2023

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In this research, fatigue tests on full-size specimens are conducted for a steel cross-beam joint before and after reinforcement. Combined with a three-dimensional (3D) numerical simulation, the 3D stress parameters, and their redistribution rules study anew with a web crack and new crack initiation locations and fatigue weakness details are predicted. The research results include the following: 1) The empirical formula parameter m of the Z-axis stress for the new crack tip is approximately 0.05. 2) The fatigue performance of the web’s new crack tips is significantly improved by bolting reinforced steel plates, the stress range is reduced by 60%-98.78%, and the original crack stops growing in size. The health monitoring system can choose the predicted weak details as valid monitoring points so that the fatigue damage can be intelligently perceived after the reinforcement of steel bridges.

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“…In engineering practices, the loading conditions are usually categorized to constant amplitude loading (CAL) and variable amplitude loading (VAL). Tremendous efforts have been made by researchers to predict fatigue failure and fatigue lifetime under CAL(Alexopoulos et al., 2013; D’Antuono, 2020; Pandey and Chand, 2004) and VAL (Huffman and Beckman, 2013; Kwofie and Rahbar, 2013; Li et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

A modified fatigue damage model considering loading sequence effect

Zhu

Zhang

Ding

2022

International Journal of Damage Mechanics

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A modified fatigue damage model is proposed considering the loading sequence effect under variable amplitude loading conditions. The transition sequence is obtained from the counting sequence by an equivalent rainflow counting method and is used to provide the loading sequence information for fatigue damage accumulation prediction. Rainflow counting matrix and sequence transition matrix are formulated based on the rainflow counting sequence and the transition sequence. The relation between the two matrices and the original loading sequence is evaluated in detail. In the deterministic fatigue estimation, the rainflow counting matrix and the sequence transition matrix are integrated into the proposed modified damage model based on the linear damage rule. Mean stress transition is applied to the rainflow counting matrix for loading level effect. Existing experimental data are used to validate the fatigue damage estimation from the deterministic framework. In order to evaluate the fatigue under random loading conditions, the rainflow counting matrix and sequence transition matrix are mapped to one-dimensional exponential and Laplace distributions based on the stationary random process. Numerical simulation is conducted to validate the proposed mapping distributions. Meanwhile, the impact of the correlation length on the proposed distributions under stationary random loading sequence is investigated as well. Finally, with the given distributions of the rainflow counting matrix and sequence transition matrix, a reconstruction procedure is simulated and discussed for probabilistic fatigue estimation. The proposed model provides a sophisticated approximation to the original loading sequence with a sequence transition effect. The proposed modified fatigue damage model corrects the deficiencies of the linear damage rule with sufficient sequence information from the originally applied loading. Furthermore, the probabilistic fatigue estimation can evaluate the accumulated fatigue damages under a random loading process with the sequence transition effect.

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Fatigue crack growth prediction model under variable amplitude loading conditions

Cited by 4 publications

References 15 publications

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Estimation of remaining fatigue life with an energy-based model considering the effects of loading sequence and load interaction

Research on fatigue vulnerable details of cross beam joints after reinforcement for steel truss bridges

A modified fatigue damage model considering loading sequence effect

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