A new low cycle fatigue criterion for isothermal and out-of-phase thermomechanical loading

Gocmez, Taner; Awarke, Ali; Pischinger, Stefan

doi:10.1016/j.ijfatigue.2009.11.003

Cited by 47 publications

(45 citation statements)

References 16 publications

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“…[3] The main damage mechanisms are mechanical damage by fatigue, viscous phenomena by stress relaxation/creep, and environmental damage by oxidation. [4] Gocmez et al [4] point out that in damage models the oxidation process is defined as a function of strain range, strain rate, straintemperature phasing, and oxidation kinetics. They claim that creep damage is based on stress, temperature, strain-temperature phasing, and time.…”

Section: Introductionmentioning

confidence: 99%

Effects of Holding Time on Thermomechanical Fatigue Properties of Compacted Graphite Iron Through Tests with Notched Specimens

Ghodrat

Riemslag

Kestens

et al. 2012

Metall Mater Trans A

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In cylinder heads of compacted graphite iron (CGI), the heating and cooling cycles can lead to localized cracking due to thermomechanical fatigue (TMF). Traditionally, TMF behavior is studied by thermal cycling of smooth specimens. The resulting number of cycles to failure (N f ) constitutes a single parameter that can be used to predict actual service failures. Nevertheless, there are also some drawbacks of the conventional testing procedures, most noticeably the prolonged testing times and a considerable scatter in test results. To address these drawbacks, TMF tests were performed using notched specimens, resulting in shorter testing times with less scatter. In the case of cast iron, artificial notches do not necessarily change the TMF behavior since the inherent graphite particles behave as internal notches. Using a notch depth of 0.2 mm, the effect of prolonged holding times (HT) on TMF lifetime was studied and a clear effect was found. Extended holding times were also found to be accompanied by relaxation of compressive stresses, causing higher tensile stresses to develop in the subsequent low temperature stages of the TMF cycles. The lifetimes in notched CGI specimens can be predicted by the Paris' fatigue crack growth model. This model was used to differentiate between the individual effects of stress level and holding times on TMF lifetime. Microstructural changes were evaluated by analyzing quantitative data sets obtained by orientation contrast microscopy based on electron backscattered diffraction (EBSD).

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Section: Introductionmentioning

confidence: 99%

Effects of Holding Time on Thermomechanical Fatigue Properties of Compacted Graphite Iron Through Tests with Notched Specimens

Ghodrat

Riemslag

Kestens

et al. 2012

Metall Mater Trans A

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“…Recently, Gocmez et al (2010) presented a stress correction factor (SCF) to modify the normalized PSED by…”

Section: Mean Stress Correction Methods In Fatiguementioning

confidence: 99%

Mean stress effect correction in strain energy-based fatigue life prediction of metals

Zhu

Lei

Huang

et al. 2016

International Journal of Damage Mechanics

117

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A new mean stress corrected strain energy model is proposed for fatigue life prediction of metals. Specifically, a mean stress sensitivity parameter is incorporated into modify the dissipated strain energy by introducing two mean stress correction factors. The prediction accuracy of the proposed model is compared with those of Walker, Smith-Watson-Topper, Morrow, and generalized damage parameter models by using 13 experimental data sets. All data points for each material are, respectively, fitted into a single mean stress corrected strain energy-life curve. More accurate predictions are achieved by the proposed model for all data sets with lower model prediction errors than others.

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“…Several models have been developed to estimate the fatigue lifetime of materials under room temperature (RT) and high temperature (HT) low cycle fatigue (LCF), and also TMF loadings. Material constants in these models can be calibrated by experimental fatigue results.…”

Section: Introductionmentioning

confidence: 99%

“…The simplest method to determine the fatigue lifetime can be considered as a function of cyclic strain or stress amplitudes . One of these methods is the Manson–Coffin–Basquin approach, which is a strain‐based model.…”

Section: Introductionmentioning

confidence: 99%

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A new energy‐based isothermal and thermo‐mechanical fatigue lifetime prediction model for aluminium–silicon–magnesium alloy

Farrahi

Azadi

Winter

et al. 2013

Fatigue Fract Eng Mat Struct

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In this paper, a new fatigue lifetime prediction model is presented for the aluminium–silicon–magnesium alloy, A356.0. This model is based on the plastic strain energy density per cycle including two correction factors in order to consider the effect of the mean stress and the maximum temperature. The thermal term considers creep and oxidation damages in A356.0 alloy. To calibrate the model, isothermal fatigue and out‐of‐phase thermo‐mechanical fatigue (TMF) tests were conducted on the A356.0 alloy. Results showed an improvement in predicting fatigue lifetimes by the present model in comparison with classical theories and also the plastic strain energy density (without any correction factors). Therefore, this model is applicable for TMF, low cycle fatigue (LCF) and both TMF/LCF lifetimes of the A356.0 alloy. Furthermore, this model can be easily used for the estimation of thermo‐mechanical conditions in components such as cylinder heads.

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A new low cycle fatigue criterion for isothermal and out-of-phase thermomechanical loading

Cited by 47 publications

References 16 publications

Effects of Holding Time on Thermomechanical Fatigue Properties of Compacted Graphite Iron Through Tests with Notched Specimens

Effects of Holding Time on Thermomechanical Fatigue Properties of Compacted Graphite Iron Through Tests with Notched Specimens

Mean stress effect correction in strain energy-based fatigue life prediction of metals

A new energy‐based isothermal and thermo‐mechanical fatigue lifetime prediction model for aluminium–silicon–magnesium alloy

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