Fatigue Behavior of Large Cast Components under Variable Amplitude Loading with Overloads

Bleicher, Christoph; Wagener, Rainer; Kaufmann, Heinz

doi:10.4271/2019-01-0526

Cited by 4 publications

(8 citation statements)

References 5 publications

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“…Metallurgical investigations 21 showed a nodularity of 85.3 and a fraction of ferrite/pearlite/graphite of 82.2/4.6/13.3. Additional information is given in another publication.…”

Section: Specimen For the Fatigue Testmentioning

confidence: 99%

“…More detailed information on the microstructure of the specimens is presented in another publication. 21 In this work, the influence of the transient material behavior on the calculated lifetime is investigated. For this purpose, strain-controlled fatigue tests and fatigue analyses with the strain-life approach were carried out.…”

Section: Introductionmentioning

confidence: 99%

“…The specimens for the strain controlled fatigue test were taken from a machine frame of a wind energy turbine and tested under constant and variable amplitude loading. 21 To investigate the influence of overloads on lifetime, three different scenarios were investigated: (a) without overload, (b) with an overload at the beginning, and (c) with an overload after one transit of the load spectrum (L S = 5 Á 10 5 ). The overload consists of a cycle in the compression range (Δε = 1%, R ε = À ∞) and was selected in such a way that it leads to high tensile residual stresses.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the material has to be treated as sound even so smaller defects might be present. All defects still occurring less than 1 mm are within the scatter band and need to be taken as “as cast.” More detailed information on the microstructure of the specimens is presented in another publication 21 …”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, strain‐controlled fatigue tests and fatigue analyses with the strain‐life approach were carried out. The specimens for the strain controlled fatigue test were taken from a machine frame of a wind energy turbine and tested under constant and variable amplitude loading 21 . To investigate the influence of overloads on lifetime, three different scenarios were investigated: (a) without overload, (b) with an overload at the beginning, and (c) with an overload after one transit of the load spectrum ( L S = 5 · 10 5 ).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Hesseler

Baumgartner

Bleicher

2021

Fatigue Fract Eng Mat Struct

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The consideration of realistic load assumptions is important for the fatigue design of highly stressed nodular cast iron components for wind energy application. Especially in case of overloads causing elastic–plastic deformation, residual stresses may have a strong impact on fatigue life. In strain‐controlled fatigue tests with constant and variable amplitudes, the influence of overloads on lifetime was investigated. During fatigue testing, the transient material behavior, cyclic hardening, cyclic relaxation of the residual stresses, and quasi‐static creep effects of the EN‐GJS‐400‐18‐LT was recorded and evaluated. To quantify the influence of the transient material behavior on the calculated lifetime, fatigue analyses are carried out with the strain‐life approach, both with and without consideration of the transient material behavior. The results show that conservative damage sums are derived if the transient material behavior, especially the relaxation of tensile residual stresses, is neglected.

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“…Metallurgical investigations 21 showed a nodularity of 85.3 and a fraction of ferrite/pearlite/graphite of 82.2/4.6/13.3. Additional information is given in another publication.…”

Section: Specimen For the Fatigue Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Hesseler

Baumgartner

Bleicher

2021

Fatigue Fract Eng Mat Struct

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View full text Add to dashboard Cite

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Assessment of service loads and material influence on the lifetime of thick-walled nodular cast iron components

Bleicher

Kaufmann

Melz

2021

International Journal of Fatigue

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Linking the microstructure with strain-life curves for improved utilization of the lightweight potential of thick-walled nodular cast iron

Pittel,

Niewiadomski,

Bleicher

2024

J. Phys.: Conf. Ser.

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The assessment of the fatigue life of critical, highly stressed component areas is an important aspect in the design of thick-walled components for wind turbines made of nodular cast iron. With the demand for resource efficiency through lightweight design combined with a certain capability to withstand extreme loads and special events, this issue is becoming increasingly important. However, there are still gaps in the description of local strain-based material behaviour. For the design and local strain-based fatigue assessment of large cast components, possibilities to determine the fatigue life as accurately as possible must be provided by standards and guidelines. The paper aims to provide a wide range of material and fatigue data from one common source for general design interests. During research projects at Fraunhofer LBF, material properties for the PRAM-based fatigue life assessment and the elastic-plastic material behaviour have been derived from 9 nodular cast iron grades with 44 microstructural variations. To describe the influence of the technological size effect on cyclic stress-strain and PRAM-N curves the quasi-static parameters (tensile strength and elongation at break) and the microstructure (nodularity and graphite particle density) are considered. In addition, suggestions for scatter bands in the strain-based design approach are given to the designers of thick-walled GJS components.

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Fatigue Behavior of Large Cast Components under Variable Amplitude Loading with Overloads

Cited by 4 publications

References 5 publications

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Consideration of the transient material behavior under variable amplitude loading in the fatigue assessment of nodular cast iron using the strain‐life approach

Assessment of service loads and material influence on the lifetime of thick-walled nodular cast iron components

Linking the microstructure with strain-life curves for improved utilization of the lightweight potential of thick-walled nodular cast iron

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