Ultrasonic Fatigue Tests on a High Strength Steel for Welded Structure

Peng, Wen Jie; Qiu, Bao Wen; Li, Rong Feng; Xue, Hongqian

doi:10.4028/www.scientific.net/amr.503-504.714

Cited by 5 publications

(5 citation statements)

References 4 publications

(2 reference statements)

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“…The presence of inevitable heating effects under ultrasonic tests at high stress amplitudes has been already confirmed in a previous work of the authors for ferritic-martensitic steel [23]. Peng et al [21] stated that for structural steels with low tensile strength the specimen is prone to heating and burning at high stress amplitudes even by employing intermittent loading along with cooling systems. Yu et al [20] affirmed that for bainite-martensite steels under intermittent ultrasonic loading, when the stress level is high, the generated heat cannot be dissipated effectively in spite of maximizing the interruption time and minimizing the oscillation time.…”

Section: Introductionmentioning

confidence: 53%

Correlation of the high and very high cycle fatigue response of ferrite based steels with strain rate-temperature conditions

et al. 2017

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The discrepancies observed between conventional and ultrasonic fatigue testing are assessed through the mechanisms of dislocation mobility in BCC metals. The existence of a transition condition between thermally-activated and athermal regimes for screw dislocation mobility is studied under fatigue loading based on infrared thermography and microstructural characterization, here in the case of DP600 dualphase steel. Evidence is obtained regarding the microstructural sources of crack initiation, which is found to be consistent with the existence of a transition in the modes of deformation. From the analysis of the experimental data gathered in this work, guidelines are given regarding the comparison and interpretation of S-N curves obtained from conventional and ultrasonic fatigue testing. The inevitable temperature increases under ultrasonic fatigue at high stress amplitudes along with the rate dependent deformation behavior of ferrite, as a BCC structure, were found as the key parameters explaining the observed fatigue behavior and thermal response under low and ultrasonic frequencies. A transition map was produced using the experimental results for DP600 steel as well as data available in the literature for other ferrite based steels, showing the correlation between thermally-activated screw dislocation movement and the absence of failure in very high cycle fatigue.

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Section: Introductionmentioning

confidence: 53%

Correlation of the high and very high cycle fatigue response of ferrite based steels with strain rate-temperature conditions

et al. 2017

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“…The mechanical property of the mould steel is: Tensile strength about 3000 MPa, yielding strength 2665 MPa, density 8.1 g/cm 3 , elastic modulus 217 GPa, Poisson ration 0.3 and HRC 63. The tests are conduct with symmetric cycle stress R=-1 at room temperature in air.…”

Section: Resultsmentioning

confidence: 99%

“…For example, ultrasonic fatigue testing machine provides 10 9 cycles within only one day. As a tool to provide ultra-high cycles fatigue test and accelerate the conventional fatigue tests, it has gain more and more application [3][4].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Size Effect on Fatigue Property of 3000 MPa-Class Mould Steel Under Ultrasonic Fatigue Testing

Peng

Long

et al. 2012

AMM

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“…Accelerating the fatigue tests through improving the frequency dramatically may lead to a difference of the test results of ultrasonic fatigue tests and the conventional fatigue tests. It is so-called "frequency effect"。In order to verify the frequency effect, the tests of smooth specimens of a high strength steel for welded structure were carried out at 20kHz and 150Hz [6] respectively. The test results are shown in Fig.…”

Section: Frequency Effectmentioning

confidence: 99%

On the Research and Application of Ultrasonic Fatigue Testing Technology

Peng

Wang

Xue

et al. 2015

KEM

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In the present paper, the characteristic and the application of ultrasonic fatigue testing technology is illuminated. The main problems i.e. the size effect, the thermal effect and frequency effect due to the high frequency are discussed. The results show that: 1. As there is a size effect, a uniform specimen size should be adopted in the very-high cycle fatigue standard and for special designed specimen the designed size should be noted along with the fatigue test results; 2.the heat generation attributes mainly to the low yield strength and the high applied stress, as a result, ultrasonic fatigue testing technology can be mainly applied to the ultra-high cycle fatigue test of high-strength steel; 3.the frequency effect is related to the crystal structure of metallic materials, however, ultrasonic fatigue testing technology can be applied to conduct the comparison of the fatigue properties of the same steel grade before and after the smelting process.

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Ultrasonic Fatigue Tests on a High Strength Steel for Welded Structure

Cited by 5 publications

References 4 publications

Correlation of the high and very high cycle fatigue response of ferrite based steels with strain rate-temperature conditions

Correlation of the high and very high cycle fatigue response of ferrite based steels with strain rate-temperature conditions

An Investigation of Size Effect on Fatigue Property of 3000 MPa-Class Mould Steel Under Ultrasonic Fatigue Testing

On the Research and Application of Ultrasonic Fatigue Testing Technology

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