Methods for the construction of the diagrams of fatigue crack-growth rate of materials

Ostash, О. P.; Panasyuk, V. V.; Andreiko, I. M.; Chepil, R. V.; Kulyk, Volodymyr; Vira, V. V.

doi:10.1007/s11003-007-0056-6

Cited by 16 publications

(11 citation statements)

References 15 publications

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“…7) is close to the experimental results. According to the [7], the kinetic fatigue fracture diagrams for B and W steels have been constructed. The differences in the fatigue crack growth rate have been identified.…”

Section: Discussionmentioning

confidence: 99%

“…In comparison to the force approach and K basis in fatigue fracture diagrams, the CTOD is more sensitive for degradation changes in kinetics of fatigue crack growth in the puddled steel. In the light of the experimental results and deliberations in the works [7][8][9], it seems that energy description for the fatigue crack growth rate and microstructural degradation influence is a promising approach. …”

Section: Discussionmentioning

confidence: 99%

“…During the experiment, the force, displacement and crack opening displacement (COD) signals were registered. Two types of diagrams were constructed -on the bases of magnitude of the stress intensity factor K and (according to the [7]) t -CTOD (crack tip opening displacement). The method for estimating the value of CTOD has been described in the work [7].…”

Section: Fatigue Crack Growth Rate and Analytical Descriptionmentioning

confidence: 99%

“…In several studies (i.e. [7,8,9]), the relationship between low-cycle fatigue properties and the kinetics of fatigue crack growth in metals has been proposed. The base of consideration is always the dissipated energy during the cyclic loading.…”

Section: Fatigue Crack Growth Rate and Analytical Descriptionmentioning

confidence: 99%

“…For the steels B and W the experimental data were not so comprehensive -particularly in low-cycle fatigue investigation. Therefore, in case of B and W steels, the fatigue fracture diagrams have been constructed using a method described in [7], where the force, deformation and energy approach have been discussed. All the results with exponent model data fitting are shown in Fig.…”

Section: Fatigue Crack Growth Rate and Analytical Descriptionmentioning

confidence: 99%

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Kinetics of fatigue crack growth and crack paths in the old puddled steel after 100-years operating time

Lesiuk

Szata

2015

Frattura Ed Integrità Strutturale

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ABSTRACT. The goal of the authors' investigations was determination of the fatigue crack growth in fragments of steel structures (of the puddled steel) and its cyclic behavior. Tested steel elements coming from the turn of the 19 th and 20 th were gained from still operating ancient steel construction (a main hall of Railway Station, bridges etc.). This work is a part of investigations devoted to the phenomenon of microstructural degradation and its potential influence on their strength properties. The analysis of the obtained results indicated that those long operating steels subject to microstructure degradation processes consisting mainly in precipitation of carbides and nitrides inside ferrite grains, precipitation of carbides at ferrite grain boundaries and degeneration of pearlite areas [1,2]. It is worth noticing that resistance of the puddled steel to fatigue crack propagation in the normalized state was higher. The authors proposed the new kinetic equation of fatigue crack growth rate in such a steel. Thus the relationship between the kinetics of degradation processes and the fatigue crack growth rate also have been shown. It is also confirmed by the materials research of the viaduct from 1885, which has not shown any significant changes in microstructure. The non-classical kinetic fatigue fracture diagrams (KFFD) based on deformation () or energy (W) approach was also considered. In conjunction with the results of low-and high-cycle fatigue and gradual loss of ductility as a consequence (due to the microstructural degradation processes) -it seems to be a promising construction of the new kinetics fatigue fracture diagrams with the energy approach.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%