Fatigue Life Estimation under Cyclic Loading Including Out-of-Parallelism of the Characteristics

Kurek, Marta; Łagoda, Tadeusz

doi:10.4028/www.scientific.net/amm.104.125

Cited by 14 publications

(6 citation statements)

References 11 publications

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“…The tests of fatigue life of specimens subjected to cyclic loadings were applied for determination of the parameters in the regression equation for pure bending according to the standard ASTM . The results of fatigue tests specimens made of brass under cyclic and block loading are presented respectively in papers . The authors also presented a model estimation the fatigue life under random load for specimens made of brass.…”

Section: Test Methodsmentioning

confidence: 99%

Influence of changes of the bending plane position on the fatigue life

Krzyżak

Kurek

Łagoda

et al. 2014

Materialwissenschaft Werkst

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The paper concerns influence of changes of the bending plane position on the fatigue life. The obtained results were analyzed and compared with the fatigue results for oscillatory bending.The applied specimens were smooth, they had round sections, and they were made of the leaded brass CuZn40Pb2 (MO58). The results obtained under cyclic bending with the plane position change were compared with the results obtained for the specimens with the same parameters under pure oscillatory bending. A change of the bending plane position occurred every 10% fatigue life determined under pure oscillatory bending at the given amplitude of the bending moment, according to the defined fatigue characteristics. Calculated values of nominal stress in a cross section were recalculated according with cyclic material properties and values of elastoplastic stress were obtained.

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Section: Test Methodsmentioning

confidence: 99%

Influence of changes of the bending plane position on the fatigue life

Krzyżak

Kurek

Łagoda

et al. 2014

Materialwissenschaft Werkst

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“…These formulas can only be directly applied at the fatigue limit level or in the case of parallel characteristics. Otherwise, iterative methods should be used as presented in the papers [ 18 , 19 ].…”

Section: Multiaxial Strain Fatigue Criterion Using To the Concept mentioning

confidence: 99%

Formulation of Strain Fatigue Criterion Based on Complex Numbers

et al. 2021

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In the case of many low-cycle multiaxial fatigue criteria, we encounter a mathematical problem of adding vectors of normal and shear strains. Typically, the problem of defining an equivalent strain is solved by weighting factors. Unfortunately, this ignores the fact that these vectors represent other physical quantities: the normal strain is a longitudinal strain, and the shear strain is a rotation angle. Therefore, the goal of the present work was to propose a method of combining different types of strains by adopting a system of complex numbers. The normal strain was defined as the real part and the shear strain was defined as the imaginary part. Using this approach, simple load states, such as pure bending and pure torsion, have been transformed into an expression for equivalent strain identical to the previously proposed criteria defined by Macha.

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“…Figure 3 shows the moment of a crack's initiation due to fatigue, when the bending moment began to drop rapidly. An analysis of changes in the bending moment showed that greater bending moment amplitudes were obtained in the case of larger deviation amplitudes; thus, the fatigue life values were smaller [19]. This specific number of cycles was taken to be the number of cycles required to initiate a crack due to fatigue.…”

Section: Fatigue Testing Of 16mo3 Steel Under Tension-compression Andmentioning

confidence: 99%

Using Fatigue Characteristics to Analyse Test Results for 16Mo3 Steel under Tension-Compression and Oscillatory Bending Conditions

Kurek

2020

Materials

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In this study, 16Mo3 steel was analysed for fatigue tests under tension-compression and oscillatory bending conditions. The analysis involved a comparison of fatigue test results obtained using the Manson-Coffin-Basquin, Langer and Kandil models and the models proposed by Kurek-Łagoda. It was observed that it is possible to substitute the basic tension-compression test performed in large testing machines with oscillatory bending tests carried out on a simple, modern test stand. The tests were performed under oscillatory bending on a prototype machine. The testing of 16Mo3 steel proved that the best-known Mason-Coffin-Basquin fatigue characteristic describes the results of all of the experimental tests very well, but the model can only be used when it is possible to divide strains into elastic and plastic components. It should be emphasised here that there is no such possibility in the case of tests performed under oscillatory bending conditions. It was proven that the proposed test method can substitute the tension-compression test very well and be a much more cost efficient way to obtain LCF material fatigue properties.

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Fatigue Life Estimation under Cyclic Loading Including Out-of-Parallelism of the Characteristics

Cited by 14 publications

References 11 publications

Influence of changes of the bending plane position on the fatigue life

Influence of changes of the bending plane position on the fatigue life

Formulation of Strain Fatigue Criterion Based on Complex Numbers

Using Fatigue Characteristics to Analyse Test Results for 16Mo3 Steel under Tension-Compression and Oscillatory Bending Conditions

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