Investigation of Energy Dissipation and Plastic Zone Size During Fatigue Crack Propagation in a High-Alloyed Steel

Bär, Jürgen; Seifert, Stefan

doi:10.1016/j.mspro.2014.06.068

Cited by 20 publications

(11 citation statements)

References 5 publications

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“…A change of the phase shift due to plastic deformation cannot be observed. In consequence, the investigations of the cyclic plastic zone ahead of a crack tip based on the phase shift between the force and the thermoelastic response undertaken by Tomlinson and Patterson [10] as well as Bär and Seifert [11] may be contributed to cracks in the coating due to high plastic deformation.…”

Section: Fig 7: Influence Of Crazes and Cracks In The Coating And Rimentioning

confidence: 99%

Evaluation of the Thermo-Elastic Behavior of a High-alloyed Steel by Fourier Transformation based Lock-In-Thermography

Urbanek¹,

Bär²

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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For the measurement of elastic stresses with Thermographic Stress Analysis a precise knowledge of the thermoelastic behavior also under consideration of plasticity and strain hardening is necessary. The influence of the coating and the specimen motion have been evaluated. The evaluation of the thermographic measurements was performed with a common sinus fit and a signal dissection with a discrete Fourier transformation (DFT). The distortion of the thermal response by plastic deformation is a known fact also the accompanying high harmonic parts in the DFT. The distortion of the thermal signal has been evaluated by using the Total Harmonic Distortion ratio.

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Section: Fig 7: Influence Of Crazes and Cracks In The Coating And Rimentioning

confidence: 99%

Evaluation of the Thermo-Elastic Behavior of a High-alloyed Steel by Fourier Transformation based Lock-In-Thermography

Urbanek¹,

Bär²

2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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“…The process of fatigue crack propagation in metals is accompanied by intense strain localization in areas of monotonic and cyclic plastic deformation leads to the temperature perturbation at crack tip. Many authors investigated the correlation between crack propagation rate and intensity of energy storage and dissipation processes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and showed that the dissipated energy plays a key role in the crack growth. From experimental point of view, the dissipated energy is well-measured value and could be estimated by different experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The third way is Lock-in thermography that allows space-resolved measurements and directly evaluate of elastic stress fields according to the thermo-elastic effect [13] and the investigation of dissipative energies with the double frequency method proposed by Sakagami [14]. The determination of dissipated energy is used to evaluate the crack initiation as well as effects in crack propagation experiments [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

An analysis of experimental techniques for estimation of dissipated energy evolution in metal alloys under plastic deformation

Plekhov¹,

Vedernikova²,

Iziumova³

et al. 2019

Proceedings of QIRT Asia 2019

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This work is devoted to the comparative analysis two approaches for investigation of energy dissipation in metal under fatigue crack propagation. The flat specimens with V-shaped stress concentrators from steel 304 AISE and titanium alloy Grade 2 were tested. The dissipated energy was measured using both original contact heat flux sensor and IR camera FLIR SC5000. The results of IR monitoring were analysed with a goal to estimate the amplitude of second temperature harmonics (D-mode). As a result of the study, we have shown that the dissipated energy values estimated by both methods have a good qualitative agreement. The measured values allows us to propose a correlation between the crack rate and dissipated energy for predicting the fatigue crack growth.

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“…umerical or experimental evaluation of plastic dissipation at the tip of fatigue cracks have attracted the attention of several researchers, who investigated, just as few examples, crack propagation assessment criteria [1,2], the thermal effects on stress intensity factors [3,4], the plastic zone size and energy dissipation [5][6][7]. In the field of the experimental approaches, the development of infrared cameras having increased performances (for example in terms of thermal sensitivity, spatial resolution and frame rate) has given impulse to temperature-related fatigue studies.…”

Section: Introductionmentioning

confidence: 99%

Experimental estimation of the heat energy dissipated in a volume surrounding the tip of a fatigue crack

Meneghetti

Ricotta

2015

Frattura Ed Integrità Strutturale

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Fatigue crack initiation and propagation involve plastic strains that require some work to be done on the material. Most of this irreversible energy is dissipated as heat and consequently the material temperature increases. The heat being an indicator of the intense plastic strains occurring at the tip of a propagating fatigue crack, when combined with the Neuber's structural volume concept, it might be used as an experimentally measurable parameter to assess the fatigue damage accumulation rate of cracked components. On the basis of a theoretical model published previously, in this work the heat energy dissipated in a volume surrounding the crack tip is estimated experimentally on the basis of the radial temperature profiles measured by means of an infrared camera. The definition of the structural volume in a fatigue sense is beyond the scope of the present paper. The experimental crack propagation tests were carried out on hot-rolled, 6-mm-thick AISI 304L stainless steel specimens subject to completely reversed axial fatigue loading.

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Investigation of Energy Dissipation and Plastic Zone Size During Fatigue Crack Propagation in a High-Alloyed Steel

Cited by 20 publications

References 5 publications

Evaluation of the Thermo-Elastic Behavior of a High-alloyed Steel by Fourier Transformation based Lock-In-Thermography

Evaluation of the Thermo-Elastic Behavior of a High-alloyed Steel by Fourier Transformation based Lock-In-Thermography

An analysis of experimental techniques for estimation of dissipated energy evolution in metal alloys under plastic deformation

Experimental estimation of the heat energy dissipated in a volume surrounding the tip of a fatigue crack

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