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Determination of the Region of no Effect of the Notch on Fatigue Life of AA2519 T62 Aluminium Alloy

Kotyk Maciej, Strzelecki Przemysław

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 5

EN

The paper presents a fatigue test of AA2519 T62 aluminium alloy in high-cycles region for smooth and notched specimens with stress concentration factors 1.75 and 2.28 for radii r1 = 2 mm and r2 = 1 mm, respectively. A number of cycles with no notch effect was determined for each notched specimens. The estimated values were compared with the distribution estimated on the literature data. Based on this knowledge, an analytical-experimental method was proposed to determine S-N curves for notched elements for aluminium alloys. The verification of the method gives satisfactory results. Additionally, the FITNET method and the Lee & Taylor method were used for comparison. The proposed method got the best results. The FITNET method and Lee & Taylor method obtained overestimated fatigue life and it can be concluded that the analytical method presented methods are suitable for steel materials. The proposed method can be used by engineers.

2

Analityczne podejście do wyznaczenia wysokocyklowej charakterystyki zmęczeniowej

Strzelecki Przemysław, Sempruch Janusz

Transport Przemysłowy i Maszyny Robocze

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2020

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Nr 1

70--74

PL

Istotnym ograniczeniem praktycznej implementacji obliczeń zmęczeniowych w praktyce inżynierskiej jest długotrwałość i przez to kłopotliwość przeprowadzenia badań eksperymentalnych prowadzących do wyznaczenia podstawowych charakterystyk. Z faktu tego wynika pewien nurt prac o charakterze naukowym nawiązujących do typowo analitycznych sposobów wyznaczania tych charakterystyk (np. prace Schijve [1]). Ze względu na dominujące znaczenie podejścia fenomenologicznego do nauki o zmęczeniu, próba zaproponowania metody analitycznej nie wydaje się ani niewłaściwa, ani niewystarczająca.

EN

The paper presents its own proposition of an analytical method for determining the S-N characteristic. The method is based on the value of the directional coefficient of the limited fatigue life line, determined based on the database of these parameters for a given group of materials. In addition, the parameters of the method are: tensile strength and number of load cycles assigned to the knee point of the characteristic.

3

Accuracy of determined S-N curve by selected models

Strzelecki Przemysław

Journal of Theoretical and Applied Mechanics

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2019

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Vol. 57 nr 4

859--868

EN

The study shows models defining the relationship between the fatigue life and the stress amplitude. The first models have been developed at the beginning of the 20th century; however, new models are still being developed. The author decided to compare the most commonly used model, i.e. a linear regression model and the two models discussed in ISO-12107. The comparison also included some recently developed models, i.e. Strohmeyer, Basenaire, Castillo et al., Kohout and Vechet, Leonetti et al., and Pasual and Meeker model, including its modified version. The fatigue data for S355J2+C and AISI 1045 steel were used for the comparison. The best estimate of the fatigue life was obtained by using the modified Pasual and Meeker model.