Application of Fictitious Radius to Fatigue Life Calculations of Bending Notched Specimens

Krzyżak, Daniel; Robak, Grzegorz; Łagoda, Tadeusz

doi:10.4028/www.scientific.net/kem.598.119

Cited by 2 publications

(5 citation statements)

References 9 publications

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“…The substitute value of micro-structural length, as well as of many other known lengths determining the fatigue zone is presented by scientists as a constant. However, as it was demonstrated by the works [11][12][13][14], the zone is dependent on the level and type of loading. So far developed methods are based on several approaches.…”

Section: Introductionmentioning

confidence: 93%

Equivalent Fatigue Zone in a Notched Elements Determined by Use of Non-Local Line Method with Weight Function

Krzyżak

Robak

Łagoda

2016

SSP

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The work presents non-local line method by which the equivalent fatigue zones were designated. These zones are one-dimensional efficient lengths in which operating stress variables cause initiation of fatigue cracks. The algorithm of the presented method considers the issues of multi-axial stress state, critical plane and weighting function. Calculations of stresses in the test element were performed by using the FEM assuming cyclic material properties, which are described with the model for multi-linear hardening. The empirical lifetime of elements with a notch was assumed to define length of the crack amounting to 0.1 mm. As the result of calculations, the dependence of effective length on nominal stress and radius of the notch was determined.

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Section: Introductionmentioning

confidence: 93%

Equivalent Fatigue Zone in a Notched Elements Determined by Use of Non-Local Line Method with Weight Function

Krzyżak

Robak

Łagoda

2016

SSP

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“…12 Assuming that Neuber's method was developed only to use in linear- The linear-elastic material model was assumed in computations. Nevertheless, the authors attempted to apply that method, based on the stress values calculated in an elastic-plastic strain deformation.…”

Section: T H E C O M P U T a T I O N S W I T H I N L I N E A R -E L Amentioning

confidence: 99%

“…It turned out, however, that when the reference of elasto-plastic stress in bending notched elements is calculated, ρ * values take values below zero. 12 Assuming that Neuber's method was developed only to use in linear- elastic stress-strain state, other calculations in this work are not presented. The linear-elastic material model was assumed in computations.…”

Section: T H E C O M P U T a T I O N S W I T H I N L I N E A R -E L Amentioning

confidence: 99%

“…5 This is why many authors use the method of fictitious radius for life estimations. 11,12 The purpose of the work is comparing results of experimental life for elements with ring-shaped notch, with computational life obtained with Neuber's fictitious radius method, demonstration of equivalent microstructural length variability with cycle number and proposition to consider the variability in fatigue life evaluation model. However, in the case of notched elements, where actual notch radius is bigger than zero, such approach does not provide good results.…”

mentioning

confidence: 99%

“…However, in the case of notched elements, where actual notch radius is bigger than zero, such approach does not provide good results. 11,12 The purpose of the work is comparing results of experimental life for elements with ring-shaped notch, with computational life obtained with Neuber's fictitious radius method, demonstration of equivalent microstructural length variability with cycle number and proposition to consider the variability in fatigue life evaluation model. 6…”

mentioning

confidence: 99%

See 2 more Smart Citations

Determining fatigue life of bent and tensioned elements with a notch, with use of fictitious radius

Krzyżak

Robak

Łagoda

2014

Fatigue Fract Eng Mat Struct

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The work presents verification of Neuber's fictitious radius method, used in fatigue life calculation of notched elements and welded joints. Stress values, calculated according with fictitious radius method, were compared with smooth specimens Basquin fatigue curves, and number of cycles was read. However, obtained calculated number of cycles of fatigue life does not correspond to experimental fatigue life, especially in a low cycle fatigue range. Hence, different equivalent microstructural length values were calculated for different loading levels. It was observed that equivalent microstructural length depends on loading level and type of loading. Finally, equivalent microstructural length was presented in a linear regression equation, as dependant on loading level and its relation to yield strength.

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Application of Fictitious Radius to Fatigue Life Calculations of Bending Notched Specimens

Cited by 2 publications

References 9 publications

Equivalent Fatigue Zone in a Notched Elements Determined by Use of Non-Local Line Method with Weight Function

Equivalent Fatigue Zone in a Notched Elements Determined by Use of Non-Local Line Method with Weight Function

Determining fatigue life of bent and tensioned elements with a notch, with use of fictitious radius

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