Fatigue Precracking Time Estimates for Three-Point Bending Specimens

Ghasabi, A. Alipour; Motameni, Ali; Kadıoğlu, Suat

doi:10.1007/s11668-019-00722-x

Cited by 3 publications

(6 citation statements)

References 15 publications

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“…27 N f is the number of cycles that defines the fatigue life, 2 N f is the endurance in reversals, and σ m is the mean stress, which is calculated as the mean of the minimum and maximum stresses in cyclic loading, given by Because the mean stress was used, equation (3) is also known as the Morrow mean stress or modified Morrow equation. 33…”

Section: Methodsmentioning

confidence: 99%

“…27 Once the local stresses and strains are obtained, the fatigue crack initiation life can be predicted using strain-life formulations. There are various strain-life formulations, 33 among which the Manson–Coffin relationship 29,34 between the fatigue life and total strain was used in this study, which is given by where Δ ε is the change in the strain ε, ε a denotes the strain amplitude, and the superscripts e and p define the elastic and plastic strain components, respectively. There are material-specific parameters used to identify the elastic and plastic strain components: σ f normal′ is the fatigue strength coefficient, E is the elastic modulus of the material, ε f normal′ is the fatigue ductility coefficient, and b and c are the fatigue strength power and fatigue ductility power, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…32 Hence, it can produce better life estimation accuracy than other methods, especially for low-cycle fatigue life problems. 29,33 Low-cycle fatigue has also been experimentally observed in additively manufactured metal lattice structures. 15 Hence, the strain-life model is better suited for the fatigue life analysis of lattice structures.…”

Section: Fatigue Life Prediction Using the Strain-life Modelmentioning

confidence: 99%

Section: Fatigue Life Prediction Using the Strain-life Modelmentioning

confidence: 99%

“…Because the mean stress was used, equation ( 3) is also known as the Morrow mean stress or modified Morrow equation. 33 Table 1. Material properties of Ti-6Al-4V used in the quasi-static finite element analysis (FEA).…”

Section: Fatigue Life Prediction Using the Strain-life Modelmentioning

confidence: 99%

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Fatigue life prediction of lattice structures using a strain-life method based on an equivalent solid model

Gorguluarslan

Ozay

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, an efficient fatigue life estimation approach is proposed based on an equivalent solid model, along with two stress concentration factors, instead of a lattice model to simplify simulations for the strain-life method. One of the stress concentration factors accounts for the stress concentrations at the strut joints in lattice structures without any manufacturing effect, while the other accounts for the stress concentrations due to surface defects on the struts introduced by the additive manufacturing process. A simple solid cell, for which the dimensions are the same as those of the lattice cell, is first used to estimate the fatigue life of the bulk material used in the additive manufacturing process using the Brown–Miller strain-life method. Combinations of two stress concentration factors were then utilized to predict the fatigue life of the lattice structure from the equivalent solid model. Using this approach, computationally expensive lattice structure simulations were eliminated, and the fatigue life of the lattice structure was predicted directly from the bulk material fatigue life estimation. The proposed approach was applied to different lattice types made of Ti-6Al-4V alloy using the laser-powder bed fusion additive manufacturing process. The fatigue life results estimated using the proposed approach were in good agreement with the experimental fatigue life results reported in the literature.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Fatigue Life Prediction Using the Strain-life Modelmentioning

confidence: 99%

Section: Fatigue Life Prediction Using the Strain-life Modelmentioning

confidence: 99%

Section: Fatigue Life Prediction Using the Strain-life Modelmentioning

confidence: 99%

See 3 more Smart Citations

Fatigue life prediction of lattice structures using a strain-life method based on an equivalent solid model

Gorguluarslan

Ozay

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Simulation of crack closure effect on cracked beam vibrations

Günhan,

Acar,

Kadıoğlu

2024

Engineering Fracture Mechanics

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Fatigue Crack and Residual Life Prediction Based on an Adaptive Dynamic Bayesian Network

Chen,

Ma,

Wang

et al. 2024

Applied Sciences

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Monitoring the health status of aerospace structures during their service lives is a critical endeavor, aimed at precisely evaluating their operational condition through observation data and physical modeling. This study proposes a probabilistic assessment approach utilizing Dynamic Bayesian Networks (DBNs), enhanced by an improved adaptive particle filtering technique. This approach combines physical modeling with various predictive sources, encompassing cognitive uncertainties inherent in stochastic predictions and crack propagation forecasts. By employing crack observation data, it facilitates predictions of crack growth and the residual life of metal structure. To demonstrate the efficacy of this method, the research leverages data from three-point bending and single-edge tension fatigue tests. It gathers data on crack length during the fatigue crack progression, integrating these findings with digital twin theory to forecast the residual fatigue life of the specimens. The outcomes show that the adaptive DBN model can precisely predict fatigue crack propagation in test specimens, offering a potential tool for the online health assessment and life evaluation for aerospace structures.

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Fatigue Precracking Time Estimates for Three-Point Bending Specimens

Cited by 3 publications

References 15 publications

Fatigue life prediction of lattice structures using a strain-life method based on an equivalent solid model

Fatigue life prediction of lattice structures using a strain-life method based on an equivalent solid model

Simulation of crack closure effect on cracked beam vibrations

Fatigue Crack and Residual Life Prediction Based on an Adaptive Dynamic Bayesian Network

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