Fatigue crack growth of multiple interacting cracks: Analytical models and experimental validation

Galatolo, Roberto; Lazzeri, Roberta

doi:10.1111/ffe.12671

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…In their study, fatigue testing campaigns were performed on six different settings of notches and cracks, which include several interacting cracks around the holes. By comparison of the experimental results with those from the implemented models, a good agreement can be obtained [9]. Xu et al investigated a linearly independent higher-order extending numerical manifold method and its application to multiple crack growth simulations.…”

Section: Introductionmentioning

confidence: 90%

Modeling the Crack Interference in X80 Oil and Gas Pipeline Weld

et al. 2023

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Based on the numerical simulation method of the virtual crack closure technique (VCCT), an interference model was established to investigate the physical problem of two interacting cracks of different sizes in the welding zone of oil and gas pipelines. The obtained results of the current interference problem were compared with those of single crack case. Various crack configurations, such as different crack spacing and different crack sizes, were analyzed. The characteristic quantity fluid pressure load P during the crack propagation process, the peak value of the von Mises stress distribution field of the crack growth path, as well as the difference ∆Bx between the peak value of the magnetic induction intensity component at the crack and the value of the magnetic induction intensity component at its symmetrical position were calculated. The crack interaction scale factors, including γP, γMises, and γΔBx, were compared and analyzed. The numerical modeling results show that when the unequal-length double cracks interfere with each other, the cracks are more likely to propagate toward each other. The tendency of the double-cracks to propagate toward each other gradually weakens as the distance between the crack tips increases and is finally the same as that of single-crack cases. It was also found that the effect of large-sized cracks on small-sized cracks is greater than that of small-sized ones on large-sized ones. The numerical modeling results could be applied for the prediction and analysis of multicrack damage in oil and gas pipeline welds.

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Section: Introductionmentioning

confidence: 90%

Modeling the Crack Interference in X80 Oil and Gas Pipeline Weld

et al. 2023

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“…Galatolo [7] critically analyzed the theoretical research in the literature, transformed it into analytical models, and conducted fatigue tests to validate these models. And use the model to develop the PISA code for simulating crack propagation in aerospace metal components.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Fatigue Crack Propagation Rate of 925A Steel for a Ship Rudder System

Yu,

Guo,

Cao

et al. 2024

Materials

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The low-temperature fatigue crack propagation rate of 925A steel, as a rudder steel for polar special ships, has a crucial impact on the evaluation of the fatigue strength of polar ships. The purpose of this article is to study the fatigue crack propagation rate of 925A steel under different low-temperature conditions from room temperature (RT) to −60 °C. The material was subjected to fatigue crack propagation tests and stress intensity factor tests. The experimental tests were conducted according to the Chinese Standard of GB/T6398-2017. The results show that as the temperature decreases, the lifespan of 925A increases. Within a certain stress intensity factor, as the temperature decreases, the fatigue crack propagation rate decreases. At −60 °C, it exhibits ductile fracture; within normal polar temperatures, it can be determined that 925A meets the requirements for low-temperature fatigue crack propagation rates in polar regions. However, in some extreme polar temperatures below −60 °C, preventing brittle failure becomes a key focus of fatigue design. Finally, the fatigue crack propagation behavior at the microscale of 925A steel at low temperatures was described using fracture morphology. The experimental data can provide reference for the design of polar ships to further resist low-temperature fatigue and cold brittle fracture.

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“…The SIF is calculated with the newly revised formula [ 4 ]. For a variety of different porous multicrack structures, the composite method is used to evaluate SIF by superimposing a set of appropriate elementary solutions to consider different geometric boundaries [ 5 ]. The integral mean is used to quantify the SIF at the crack tip [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Damage-Accumulation-Induced Crack Propagation and Fatigue Life Analysis of a Porous LY12 Aluminum Alloy Plate

Lv,

Wang,

Zhao

et al. 2023

Materials

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Rivets are usually used to connect the skin of an aircraft with joints such as frames and stringers, so the skin of the connection part is a porous structure. During the service of the aircraft, cracks appear in some difficult-to-detect parts of the skin porous structure, which causes great difficulties in the service life prediction and health monitoring of the aircraft. In this paper, a secondary development subroutine in PYTHON based on ABAQUS-XFEM is compiled to analyze the cracks that are difficult to monitor in the porous structure of aircraft skin joints. The program can automatically analyze the stress intensity factor of the crack tip with different lengths in the porous structure, and then the residual fatigue life can be deduced. For the sake of safety, the program adopts a more conservative algorithm. In comparison with the physical fatigue test results, the fatigue life of the simulation results is 16% smaller. This project provides a feasible simulation method for fatigue life prediction of porous structures. It lays a foundation for the subsequent establishment of digital twins for damage monitoring of aircraft porous structures.

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Fatigue crack growth of multiple interacting cracks: Analytical models and experimental validation

Cited by 8 publications

References 35 publications

Modeling the Crack Interference in X80 Oil and Gas Pipeline Weld

Modeling the Crack Interference in X80 Oil and Gas Pipeline Weld

Experimental Study on the Fatigue Crack Propagation Rate of 925A Steel for a Ship Rudder System

Damage-Accumulation-Induced Crack Propagation and Fatigue Life Analysis of a Porous LY12 Aluminum Alloy Plate

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