Low Cycle Fatigue of Steel in Strain Controled Cyclic Bending

Kulesa, Anna; Kurek, Andrzej; Łagoda, Tadeusz; Achtelik, Henryk; Kluger, Krzysztof

doi:10.1515/ama-2016-0011

Cited by 11 publications

(8 citation statements)

References 17 publications

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“…A part of the research data was obtained from the available literature, and some data were obtained from our own research. The analyzed and tested materials were 10HNAP, based on our research under tension-compression [27] and under bending [28]; 16Mo3, based on data from the literature for tension-compression [29] and on the basis of our own tests for bending [30]; 30CrNiMo3, based on data from the literature for bending [30] and tension-compression [31]; MO58, on the basis of our own tests for bending [32] and for tension-compression [33]; SM45, based on data from the literature for bending [34] and for tension-compression [29]; 2017A-T4, based on our own tests under bending [35] and tension-compression [36]; and 6082-T6, also on the basis of our own tests under bending [37] and tension-compression [38]. Table 1 presents the chemical composition of tested materials, and Table 2 presents the mechanical properties of these materials.…”

Section: Experimental Testsmentioning

confidence: 99%

The Influence of the Strain and Stress Gradient in Determining Strain Fatigue Characteristics for Oscillatory Bending

2020

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In this study, we created a new model to determine strain fatigue characteristics obtained from a bending test. The developed model consists of comparing the stress and strain gradient surface ratio for bending and tensile elements. For model verification, seven different materials were examined based on fatigue tests we conducted, or data available in the literature: 30CrNiMo8, 10HNAP, SM45C, 16Mo3 steel, MO58 brass, and 2017A-T4 and 6082-T6 aluminum alloys. As a result, we confirmed that the proposed method can be used to determine strain fatigue characteristics that agree with the values determined on the basis of a tensile compression test.

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Section: Experimental Testsmentioning

confidence: 99%

The Influence of the Strain and Stress Gradient in Determining Strain Fatigue Characteristics for Oscillatory Bending

2020

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“…where: K' -cyclic strengthening coefficient, n' -cyclic strengthening exponent. This characteristic is needed for determining elastic-plastic strains in the event of bending at the controlled moment and for dividing the strain amplitude into an elastic part and plastic part at bending and strain controlling [14].In case we have data from uniaxial tension-compression, Ramberg-Osgood equation constants (2), i.e. K' and n', we can separate an elastic and plastic part of the strain amplitude.…”

Section: Fatigue Testing Of Steel and Aluminiummentioning

confidence: 99%

Fracture of elastic-brittle and elastic-plastic material in cantilever cyclic bending

Kurek

Łagoda

2019

Frattura Ed Integrità Strutturale

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The paper analyses the fatigue tests on specimens made of 16Mo3 steel and 6082-T6 aluminium alloy performed under bending and tensile conditions. It has been shown that in the case of bending of the 16Mo3 steel specimen, in low cycle fatigue (LCF) range, the fatigue life increases with respect to the results obtained under tension-compression conditions. On the other hand, in the case of the aluminium specimen, the load condition practically does not affect the fatigue life. Microstructural analysis revealed almost homogeneous fatigue cracks in the 16Mo3 steel samples which are practically elastic-plastic. The analysed 6082-T6 aluminium alloy belongs to the group of materials characterized by elastic and brittle properties. In the case of pendulum bending in the obtained images, it is possible to notice the clear pits at an angle of about 45 degrees relative to the surface of the breakthrough. They penetrate the broken specimen to about 33%. In the middle of the material, the bending plane is clearly visible, where the stress is constant and equals 0 MPa.

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“…A few studies on bending fatigue testing in the LCF regime have been conducted to evaluate the size effect and the influence of strain gradient on fatigue failure life. Kulesa et al [9], Kurek et al [10], and Kurek [11] developed a lab-made bending testing apparatus to conduct strain-controlled cyclic bending and evaluated the relationship between fatigue failure life and total strain amplitude. They demonstrated that the fatigue life of bending specimens was slightly longer than that of T/C specimens.…”

Section: Introductionmentioning

confidence: 99%

Influence of Strain Gradient on Fatigue Life of Carbon Steel for Pressure Vessels in Low-Cycle and High-Cycle Fatigue Regimes

et al. 2022

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This paper discusses how the strain gradient influences the fatigue life of carbon steel in the low-cycle and high-cycle fatigue regimes. To obtain fatigue data under different strain distributions, cyclic alternating bending tests using specimens with different thicknesses and cyclic tension–compression tests were conducted on carbon steel for pressure vessels (SPV235). The crack initiation life and total failure life were evaluated via the strain-based approach. The experimental results showed that the crack initiation life became short with decreasing strain gradient from 102 to 106 cycles in fatigue life. On the other hand, the influence of the strain gradient on the total failure life was different from that on the crack initiation life: although the total failure life of the specimen subjected to cyclic tension–compression was also the shortest, the strain gradient did not affect the total failure life of the specimen subjected to cyclic bending from 102 to 106 cycles in fatigue life. This was because the crack propagation life became longer in a thicker specimen. Hence, these experimental results implied that the fatigue crack initiation life could be characterized by not only strain but also the strain gradient in the low-cycle and high-cycle fatigue regimes.

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Low Cycle Fatigue of Steel in Strain Controled Cyclic Bending

Cited by 11 publications

References 17 publications

The Influence of the Strain and Stress Gradient in Determining Strain Fatigue Characteristics for Oscillatory Bending

The Influence of the Strain and Stress Gradient in Determining Strain Fatigue Characteristics for Oscillatory Bending

Fracture of elastic-brittle and elastic-plastic material in cantilever cyclic bending

Influence of Strain Gradient on Fatigue Life of Carbon Steel for Pressure Vessels in Low-Cycle and High-Cycle Fatigue Regimes

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