Zur Auswertung von Schwingfestigkeitsversuchen im Zeitfestigkeitsbereich —

Martin, Andreas; Hinkelmann, Karsten; Esderts, Alfons

doi:10.3139/120.110256

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…The lower number of sustainable load cycles

N_{50 %}

with an increased frequency has an effect on the S–N diagram, i.e., the S–N curve is shifted to the left, see Figure . Furthermore, it is known from the literature that the value of the scatter T N increases as the fatigue strength

σ_{D}

approaches, e.g., Martin et al This results in a vertical shift of the S–N curve in the S–N diagram. In Figure , this influence is also strikingly illustrated.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron

Thumann

Marburg

Meinhardt

et al. 2019

steel research int.

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This paper presents experimental fatigue tests on specially shaped specimens made from quenched and tempered steel 42CrMoS4 and nodular cast iron EN-GJS-600-3. The specimens are geometrically designed to resemble actual subcomponents of forming and cutting dies for sheet metal manufacturing. These subcomponents have failed in the past.Experiments are carried out using a fictive load-time function, which is a modification of an actually measured load curve and has variable mean and amplitude values. This first test series serves as a general validation of a subsequent fatigue analysis. A second test series is carried out with constant mean and amplitude values with a load ratio R % 0. Here, the load frequencies in the individual test runs are varied between f ¼ 5 Hz and f ¼ 45 Hz in order to investigate the influence of the frequency. Both series are performed on a servo-hydraulic testing machine.The experimental data is then statistically evaluated. The values for the scatter correlate with data from the literature. The data from the test series with the fictive load-time function can thus be used for subsequent validation of a fatigue calculation, which will be addressed in a future publication. Most significant are the findings from the second series of experiments with varied load frequencies, as a significant frequency influence could be detected. Furthermore, the hardening and softening behavior under cyclic loading and the fracture behavior of the materials are analyzed and compared with data from the literature.

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“…The lower number of sustainable load cycles

N_{50 %}

σ_{D}

approaches, e.g., Martin et al This results in a vertical shift of the S–N curve in the S–N diagram. In Figure , this influence is also strikingly illustrated.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron

Thumann

Marburg

Meinhardt

et al. 2019

steel research int.

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“…It is important to select the stress horizons exclusively within the high cycle fatigue region and as close as possible to the transition areas for low cycle and long life fatigue. However, this requirement assumes prior knowledge of the approximate positions of the three regions, which highlights a disadvantage of the horizon method [4]. The determination of S-N curves can also be achieved using the pearl-string method as described in the German standard DIN 50100 [3].…”

Section: State Of the Artmentioning

confidence: 99%

Using machine learning to increase efficiency in design of experiments for cyclic characterization of fibre-reinforced plastics

2023

DS 125: Proceedings of the 34th Symposium Design for X (DFX2023)

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Efficient characterization of fatigue behavior plays a crucial role in engineering design as it reduces the financial costs associated with expensive experimental tests. Existing methods for characterizing the fatigue behavior of fibre-reinforced plastics have proven inefficient due to the oversight of important design parameters, such as fibre orientations. To address this challenge, we propose an innovative approach based on Gaussian process regression. Our approach integrates previously unaccounted design parameters into the decisionmaking process, ensuring that optimal design points are selected for testing. By doing so, we maximize the gain of knowledge within the model, resulting in improved efficiency and accurate characterization of fatigue behavior.

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“…4. Analogous to the pearl string method in DIN 50100: 2016-12 (2016), the standard deviation of the logarithmic load cycle numbers at failure over all tests was determined as s logN,corr = 0.1922 (corrected according to Martin et al 2011 to compensate for the limited sample size). This approach is based on the assumption that the respective standard deviation is constant in the finite-life regime.…”

Section: Load Cycle Numbersmentioning

confidence: 99%

High-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws under lateral loading

Niebuhr

Sieder

2021

Eur. J. Wood Prod.

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The high-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws is examined with the fasteners under bending due to their alignment lateral to the load direction. The cyclic tests were carried out with a sinusoidal non-reversed load ($$R=0.1$$ R = 0.1 ) with a loading frequency of 5 Hz. The examined connection is designed for the quasistatic failure mechanism with two plastic hinges per shear plane according to Johansen’s theory (European Yield Model), which is mirrored in the observed fatigue failure. Based on 30 cyclic tests on four nominal stress levels $$\left( S=\left\{ 0.47,\;0.41,\;0.31,\;0.20 \right\} \right) $$ S = 0.47 , 0.41 , 0.31 , 0.20 in the finite-life regime the respective Wöhler-curve is obtained, showing high conformity with the test data due to a consideration of the specific density of the individual specimens. It is shown that the examined fasteners show a superior fatigue behaviour under bending compared to axial loading. A simple safe-side approach for the application of Wöhler-curves for axial loading of threaded fasteners to the present case of fastener bending is proposed, extending the field of possible applications for the results of existing and future studies of the behaviour under axial loading.

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Zur Auswertung von Schwingfestigkeitsversuchen im Zeitfestigkeitsbereich —

Cited by 13 publications

References 3 publications

Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron

Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron

Using machine learning to increase efficiency in design of experiments for cyclic characterization of fibre-reinforced plastics

High-cycle fatigue behaviour of a timber-to-timber connection with self-tapping screws under lateral loading

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