Temperature evolution and life prediction in fatigue of superalloys

Jiang, Liang; Wang, H.; Liaw, Peter K.; Brooks, C. R.; Chen, L.; Klarstrom, D. L.

doi:10.1007/s11661-004-0010-2

Cited by 29 publications

(14 citation statements)

References 17 publications

(34 reference statements)

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“…The shorter fatigue lives in mercury at 10 than at 0.2 Hz were only found at the higher stress levels (Ն230 MPa) induced by the temperature effect (130 °C at 10 Hz vs 20°C at 0.2 Hz) ( Figure 7). However, at lower stress levels (Ͻ230 MPa), the temperature increase is generally lower, [47][48][49][50][51][52] and, thus, there were comparable temperatures at 10 and at 0.2 Hz, which resulted in similar fatigue lives at lower stresses (Figure 7).…”

Section: Discussionmentioning

confidence: 96%

Effects of frequency on fatigue behavior of type 316 low-carbon, nitrogen-added stainless steel in air and mercury for the spallation neutron source

Tian

Liaw

Fielden

et al. 2006

Metall Mater Trans A

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The high-cycle fatigue behavior of type 316 low-carbon, nitrogen-added (LN) stainless steel (SS), the prime-candidate target-container material for the spallation neutron source (SNS), was investigated in air and mercury. Test frequencies ranged from 0.2 to 10 Hz with an R ratio of Ϫ1, and 10 to 700 Hz with an R ratio of 0.1. During tension-compression fatigue studies, a significant increase in the specimen temperature was observed at 10 Hz in air, which decreased the fatigue life of the 316 LN SS relative to that at 0.2 Hz. Companion tests in air were carried out, while cooling the specimen with nitrogen gas at 10 Hz in air. In these experiments, fatigue lives were comparable at 10 Hz in air with nitrogen cooling and at 0.2 Hz in air. During tension-tension fatigue studies, a higher specimen temperature was observed at 700 than at 10 Hz. After cooling the specimen, comparable fatigue lives were found at 10 and at 700 Hz. The frequency effect on the fatigue life in mercury was found to be much less than that in air, due to the fact that mercury acts as an effective coolant during the fatigue experiment. Striation spacing on the fracture surface at different test frequencies was closely examined, relative to calculated ⌬K values, during fatigue of the 316 LN SS. Specimen self-heating has to be considered in understanding fatigue characteristics of 316 LN SS in air and mercury.

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Section: Discussionmentioning

confidence: 96%

Effects of frequency on fatigue behavior of type 316 low-carbon, nitrogen-added stainless steel in air and mercury for the spallation neutron source

Tian

Liaw

Fielden

et al. 2006

Metall Mater Trans A

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“…The temperature sensitivity is 0.015 at 23 8C, while the spatial resolution can be as small as 5.4 mm [19][20][21][22][23][24][25]. The system has a maximum dataacquisition speed of 120 Hz at a full frame of 320!256 pixels and 38,400 Hz at 16!16 pixels.…”

Section: Methodsmentioning

confidence: 99%

Comparison of fatigue behavior of a bulk metallic glass and its composite

et al. 2006

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“…For example, Guo et al showed a decrease of temperature present in phase II for AZ31B magnesium alloy. Jiang et al obtained a steady‐state phase II for lower loading levels and a linear increase for higher levels, for ULTIMET alloy and HAYNES HR‐120 alloy. The absence of stabilisation in phase II was taken into account in the accelerated method of fatigue life curve determination for different materials for rotary bending and uniaxial tension‐compression …”

Section: Plastic Strain Energy Determination Using Thermographic Analmentioning

confidence: 99%

Evaluation of plastic strain work and multiaxial fatigue life in CuZn37 alloy by means of thermography method and energy‐based approaches of Ellyin and Garud

Skibicki

Lipski

2018

Fatigue Fract Eng Mat Struct

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In the case of multiaxial loading, different models are used for prediction of fatigue life. Usually, they are divided into 3 subgroups: stress‐based for high‐cycle regime, strain‐based for low‐cycle regime, and energy‐based models, which are considered to be the most universal and applicable for both high‐cycle and low‐cycle regimes. The application of energy‐based models requires knowledge of the energy dissipated during the plastic strain, as well as the elastic strain energy. Calculation of this energy in turn requires specification of stress and strain tensor components. Determination of the stresses acting in real objects is a complicated task, however. In this paper, an attempt was made to answer the question of whether thermography enables the determination of plastic strain energy in low‐cycle uniaxial and multiaxial fatigue tests, including non‐proportional loadings. The second question was whether it is possible to use this methodology for fatigue life prediction. For this purpose, a history of temperature changes was recorded during fatigue tests conducted on CuZn37 brass, using a thermographic camera. On this basis, the values of plastic strain energy density, dissipated in the fatigue loading cycle, were calculated next. These values were compared with the values calculated from the hysteresis loops, determined from force and torque measurements, together with strains measured with a biaxial extensometer. The strain energy density was further used for prediction of fatigue life with the application of 2 models: the energy‐based model of Ellyin and a strain‐based model, where the energy was used as a non‐proportionality factor. The predicted fatigue lives were compared with experimental ones. The results can be considered as very satisfactory.

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Temperature evolution and life prediction in fatigue of superalloys

Cited by 29 publications

References 17 publications

Effects of frequency on fatigue behavior of type 316 low-carbon, nitrogen-added stainless steel in air and mercury for the spallation neutron source

Effects of frequency on fatigue behavior of type 316 low-carbon, nitrogen-added stainless steel in air and mercury for the spallation neutron source

Comparison of fatigue behavior of a bulk metallic glass and its composite

Evaluation of plastic strain work and multiaxial fatigue life in CuZn37 alloy by means of thermography method and energy‐based approaches of Ellyin and Garud

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