Effects of mixed strain rates on low cycle fatigue behaviors of austenitic stainless steels in a simulated PWR environment

Hong, Jong-Dae; Jang, Changheui; Kim, Tae Soon

doi:10.1016/j.ijfatigue.2015.06.021

Cited by 20 publications

(8 citation statements)

References 19 publications

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“…It has been shown that the fatigue life reduction is dependent on the strain rate . Then, the F en value is given as the function of strain rate as shown in Equation .…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that the fatigue life reduction is dependent on the strain rate. 1,2,29 Then, the F en value is given as the function of strain rate as shown in Equation 2. Since the crack growth acceleration is responsible for the fatigue life reduction, the degree of crack growth acceleration depends on the strain rate.…”

Section: Crack-growth Acceleration Mechanismmentioning

confidence: 99%

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Influence of strain range on fatigue life reduction of stainless steel in PWR primary water

Kamaya¹

2017

Fatigue Fract Eng Mat Struct

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The environmental effect in the pressurized water reactor (PWR) water was investigated for various applied strain range using a type 316 stainless steel. The tests were conducted using cylindrical hollow specimens at 325°C. It was shown that the ratio of the fatigue life in the PWR water environment to that in air was about 0.3 to 0.4 regardless of the strain range when the applied strain ranges were 0.8% or more. Crack growth rates identified from spacing of striations observed on fractured surfaces were used to demonstrate that the fatigue life reduction in the PWR water environment could be attributed to the crack growth acceleration. The fractured surface observations revealed that crack initiation was enhanced by the PWR water environment. On the other hand, the reduction in the fatigue life was not significant when the strain ranges were 0.5% and 0.44%, and the specimens did not fail when the strain ranges were 0.38% or less. It was deduced that the crack initiation was not enhanced for the relatively small strain range, and the crack growth was not accelerated. Since the fatigue limit of the test material was 0.4% in the strain range in air, it was concluded that the fatigue limit was not reduced in the PWR water environment.

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“…It has been shown that the fatigue life reduction is dependent on the strain rate . Then, the F en value is given as the function of strain rate as shown in Equation .…”

Section: Discussionmentioning

confidence: 99%

Section: Crack-growth Acceleration Mechanismmentioning

confidence: 99%

Influence of strain range on fatigue life reduction of stainless steel in PWR primary water

Kamaya¹

2017

Fatigue Fract Eng Mat Struct

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“…[1][2][3] Tests carried out in the simulated pressurized water reactor (PWR) coolant environment gave results revealing that the degree of the fatigue life reduction due to the environmental effect depended on the strain rate and test temperature. [4][5][6][7][8][9][10] Also, influences of surface finish, 10,11 dissolved hydrogen, 12 dissolved Abbreviations: JSME, The Japan Society of Mechanical Engineers; PWR, pressurized water reactor. oxygen, 13 grain size, 13 and wave shape 8,10 have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9][10] Also, influences of surface finish, 10,11 dissolved hydrogen, 12 dissolved Abbreviations: JSME, The Japan Society of Mechanical Engineers; PWR, pressurized water reactor. oxygen, 13 grain size, 13 and wave shape 8,10 have been investigated. A penalty factor F en is used to take the environmental effect into account in fatigue life assessment for component designs.…”

Section: Introductionmentioning

confidence: 99%

Environmental effect on fatigue strength of stainless steel in PWR primary water: Relation between fatigue life in air and environment

Kamaya

2024

Fatigue Fract Eng Mat Struct

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The fatigue life of Type 316 stainless steel in the pressurized water reactor (PWR) water environment and its dependency on that in air were investigated. Specimens from two heats of the material were prepared for fatigue tests, and additionally, previous test findings obtained using another heat were applied. The fatigue test results obtained for various strain ranges and strain rates revealed that the fatigue life in the water environment Nf(env) did not depend on that in air Nf(air) when the strain rate was 0.4%/s. The variation in the ratio of Nf(env) to Nf(air) was larger when Nf(air) obtained for each heat of the material was used than that when a general Nf(air) was used. The changes in the penalty factor Fen with applied strain range and strain rate could be predicted by assuming Nf(env) depended not on strain rate but on rise time.

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“…A long history of studies exists to discover the effects associated with LCF behavior at elevated temperatures: Temperature, temperature cycling, strain rate, hold time, load sequence, etc. [6,7,8,9,10]. Each previous study concentrated on identifying and quantifying the individual effects on fatigue life.…”

Section: Introductionmentioning

confidence: 99%

An Energy-Based Unified Approach to Predict the Low-Cycle Fatigue Life of Type 316L Stainless Steel under Various Temperatures and Strain-Rates

2019

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An energy-based low-cycle fatigue model was proposed for applications at a range of temperatures. An existing model was extended to the integrated approach, incorporating the simultaneous effects of strain rate and temperature. A favored material at high temperature, type 316L stainless steel, was selected in this study and its material characteristics were investigated. Tensile tests and low-cycle fatigue tests were performed using several strain rates at a temperature ranging from room temperature to 650 °C. Material properties were obtained in terms of temperature using the displacement-controlled tensile tests and further material response were investigated using strain-controlled tensile tests. Consequently, no pronounced reduction in strengths occurred at temperatures between 300 and 550 °C, and a negative strain rate response was observed in the temperature range. Based on the low-cycle fatigue tests by varying strain rates and temperature, it was found that a normalized plastic strain energy density and a strain-rate modified cycle were successfully correlated. The accuracy of the model was discussed by comparing between predicted and experimental lives.

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Effects of mixed strain rates on low cycle fatigue behaviors of austenitic stainless steels in a simulated PWR environment

Cited by 20 publications

References 19 publications

Influence of strain range on fatigue life reduction of stainless steel in PWR primary water

Influence of strain range on fatigue life reduction of stainless steel in PWR primary water

Environmental effect on fatigue strength of stainless steel in PWR primary water: Relation between fatigue life in air and environment

An Energy-Based Unified Approach to Predict the Low-Cycle Fatigue Life of Type 316L Stainless Steel under Various Temperatures and Strain-Rates

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