Fatigue Crack Initiation and Propagation Relation of Notched Specimens with Welded Joint Characteristics

Braun, Moritz; Fischer, Claas; Baumgartner, J. Craig; Hecht, Matthias; Varfolomeev, Igor

doi:10.3390/met12040615

Cited by 14 publications

(3 citation statements)

References 40 publications

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“…The study presented in [2] focuses on an assessment of the fatigue life of notched specimens with geometries and microstructure representative of welded steel joints. Thereby, welded and non-welded specimens exhibiting different artificially notched geometries, which are located in varying material zones, are investigated.…”

Section: Contributionsmentioning

confidence: 99%

Technological Aspects in Fatigue Design of Metallic Structures

Leitner

2023

Metals

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Section: Contributionsmentioning

confidence: 99%

Technological Aspects in Fatigue Design of Metallic Structures

Leitner

2023

Metals

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“…These scholars provided valuable data for the safe design and life prediction of welded marine structures. Braun M. et al [13] employed 26 series of fatigue tests on welded and non0welded specimens containing notches located in different material zones. Guo Y. et al [14] conducted axial loading fatigue tests with different stress ratios.…”

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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“…Despite the above complexities involved in the simulation, the main problem is the strong sensitivity of the fatigue crack initiation phase on the local stress-strain values at the notch root, specifically in the presence of local plasticity. In [20], it was shown that a strong correlation exists between the applied notch stress range and the experimental fatigue life, leading to short or long crack initiation. Finite element simulations in combination with analytical/empirical theories have provided more reliable results of the local stress-strain behavior and, hence, the crack initiation estimation.…”

Section: Introductionmentioning

confidence: 99%

A Combined Numerical–Analytical Study for Notched Fatigue Crack Initiation Assessment in TRIP Steel: A Local Strain and a Fracture Mechanics Approach

Christodoulou,

Kermanidis

2023

Metals

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In the fatigue design of metallic components using the safe-life approach, fatigue crack initiation as a development of slip systems at the nanoscale, followed by microstructurally short crack growth, is critical for the onset of structural failure. The development of reliable analytical tools for the prediction of crack initiation, although very complex due to the inherent multiscale fatigue damage processes involved, is important for promoting a more sophisticated design but, more importantly, enhancing the safety in regard to fatigue. The assessment of fatigue crack initiation life at the root of a V-shaped notch is performed by implementing a local strain and a fracture mechanics concept. In the low cycle fatigue analysis, the finite element method is used to determine the local stress–strain response at the notch root, which takes into account elastoplastic material behavior. Fatigue crack initiation is treated as the onset of a short corner crack by incremental damage accumulation and failure of a material element volume at the notch root. The finite element results are compared against established methodologies such as the Neuber and strain energy density methods. In the fracture mechanics approach, fatigue crack initiation is treated as the onset and propagation of a corner crack to a finite short crack. Fatigue experiments in two different transformation-induced plasticity (TRIP) steels were conducted to evaluate the analytical predictions and to determine the physical parameters for the definition of crack initiation. The analytical results show that the finite element method may be successfully implemented with existing fatigue models for a more accurate determination of the local stress–strain behavior at the notch tip in order to improve the assessment of fatigue crack initiation life compared to the established analytical methodologies.

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Fatigue Crack Initiation and Propagation Relation of Notched Specimens with Welded Joint Characteristics

Cited by 14 publications

References 40 publications

Technological Aspects in Fatigue Design of Metallic Structures

Technological Aspects in Fatigue Design of Metallic Structures

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

A Combined Numerical–Analytical Study for Notched Fatigue Crack Initiation Assessment in TRIP Steel: A Local Strain and a Fracture Mechanics Approach

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