The choice of thermal analysis to evaluate the monoaxial fatigue strength on materials and mechanical components

Risitano, Giacomo; Rosa, Guido La; Geraci, Alberto L.; Guglielmino, Eugenio

doi:10.1177/0954406215572429

Cited by 10 publications

(7 citation statements)

References 60 publications

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“…The temperatures continued to increase when applying loads greater than the fatigue limit, as shown by the width of the horizontal bands relative to the higher loads. As is well known in the literature on TA, 1–27 under fatigue conditions, the temperature variations grow with increased cyclic load over the fatigue limit. The thermal increments due to fatigue and thermoplasticity become sensitive over the fatigue limit.…”

Section: Analysis Of Resultsmentioning

confidence: 72%

“…In particular, the yield point (330 MPa) was derived following the traditional engineering method (plastic deformation at 0.2%). The fatigue limit (175 MPa) was derived using the thermographic method 18,20,24 as the intersection of the thermal increments with the stress axis (Figure 2). This point, as previously demonstrated by some authors, 18–22 corresponds to the lowest stress that does not induce plastic deformation and, therefore, crack nucleation.…”

Section: Description Of the Investigationmentioning

confidence: 99%

“…Thermographic analysis (TA) enables an assessment and prediction of the fatigue life based on analysis of the radiometric surface temperature radiated from specimens or mechanical components under cyclic loading. Most studies are based on the acquisition and assessment of the energy response of the material subjected to cyclic or pulse train loading 1–28 or, following a new procedure, under static loading 29–33 . These studies allow the prediction of the primary parameters of the fatigue response such as the fatigue limit, the duration of the fatigue lifetime 24 and the damage progression 34–37 .…”

Section: Introductionmentioning

confidence: 99%

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Energetic analysis of fatigue hysteresis by thermographic and digital image correlation methodologies

Rosa

Savio

Giudice

et al. 2020

Fatigue Fract Eng Mat Struct

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A hysteresis cycle can define the variation in mechanical characteristics of fatigue life and failure response. Traditional analysis is performed using forcedisplacement signals derived from the testing equipment, but this approach is prone to large errors due to clearances and slips in the measuring chain. For this reason, the authors here propose a novel setup able to assess accurately the strain status of specimens by digital image correlation (DIC) and a procedure to calculate the hysteresis energy by thermographic analysis in order to measure the damping energy with precision. The results obtained by an experimental investigation on a common austenitic steel (AISI 304) highlight that the hysteresis areas defined by the DIC displacements, and those found by the testing machine outputs have substantial differences in value. The thermal variations and the areas of the hysteresis loops, both linked to the plastic energy, were also compared, showing a reliable correlation.

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Section: Analysis Of Resultsmentioning

confidence: 72%

Section: Description Of the Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energetic analysis of fatigue hysteresis by thermographic and digital image correlation methodologies

Rosa

Savio

Giudice

et al. 2020

Fatigue Fract Eng Mat Struct

Self Cite

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“…Fatigue-limit estimation based on the dissipated energy measurement using infrared thermography has received increasing attention in various industries, and there are two main methods for obtaining the dissipated energy. One method is to obtain a measurement of the surface temperature of a specimen that is subjected to cyclic loading [2][3][4][5][18][19]. When the stress amplitudes are gradually increased and become higher than the fatigue limit, the surface temperature of the specimen increases.…”

Section: Introductionmentioning

confidence: 99%

Accuracy improvement in dissipated energy measurement by using phase information

Shiozawa¹,

Inagawa²,

Washio³

et al. 2017

Meas. Sci. Technol.

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In this paper, a technique for improving the accuracy of a dissipated energy measurement based on the phase information-called the phase 2f lock-in infrared method-is proposed. In the conventional 2f lock-in infrared method, the dissipated energy is obtained as the double frequency component of the measured temperature change. In this work, a phase analysis of the double frequency component has been conducted. It is found that the double frequency component includes the influence of the energy dissipation and harmonic vibration of the fatigue testing machine, and the phase difference between the thermoelastic temperature change and the double frequency component is a specific value. The phase 2f lock-in method utilizes a specific phase of the dissipated energy and is effective for removing the noise component such as the thermoelastic temperature change due to the harmonic vibration of fatigue testing machine. This method provides an improvement in the accuracy of the fatigue-limit estimate and the detection of future crack initiation points based on the dissipated energy.

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“…Ð N 0 p=Ndn = p is therefore also constant. Other authors have also noted constant cumulated dissipated heat such as Fargione et al 28 and Risitano et al 45 on nonwelded specimens. Thus, models based on critical energy principle are supported too by this result in case of welded component.…”

Section: Heat Source For Constant Amplitude Testmentioning

confidence: 85%

Thermographic approach for high cycle fatigue of seam welded steel joints under variable amplitude loadings

Pierron

Maïtournam

Raoult

2020

Fatigue Fract Eng Mat Struct

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In the automotive field, welded joints are the weak points of the steel parts of the chassis in terms of fatigue. The fatigue strength of arc-welded parts is generally evaluated using fatigue tests under constant amplitude loadings designed according the Palmgren-Miner rule. In this paper, the relevance of this process is tested with an experimental campaign on welded specimens subjected to various variable amplitude loads. In addition, to solve the recurrent issue of lack of fatigue data, a thermographic method is investigated as an alternative for monitoring the damage rate evolution. A theoretical thermal model is proposed to estimate a local heat source from the infrared thermal measurements during constant and variable amplitude loading tests. This heat source is shown to be correlated with fatigue damage, which provides a further insight on the evolution of damage during nonconstant amplitude fatigue tests.

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The choice of thermal analysis to evaluate the monoaxial fatigue strength on materials and mechanical components

Cited by 10 publications

References 60 publications

Energetic analysis of fatigue hysteresis by thermographic and digital image correlation methodologies

Energetic analysis of fatigue hysteresis by thermographic and digital image correlation methodologies

Accuracy improvement in dissipated energy measurement by using phase information

Thermographic approach for high cycle fatigue of seam welded steel joints under variable amplitude loadings

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