AE analysis of damage processes in cast iron and high-strength steel at different temperatures and loading rates

Kietov, Volodymyr; Henschel, Sebastian; Krüger, Lutz

doi:10.1016/j.engfracmech.2018.06.035

Cited by 11 publications

(8 citation statements)

References 47 publications

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“…The AE activity was also related to the onset of the plastic response. The same authors 34 performed both tensile and three-point bending tests on ferritic DCIs at quasi-static and dynamic rates, also varying the temperature. The onset of the plastic response was confirmed to be correlated to significant AE activity, and simultaneous peaks of acoustic activity were detected just after the yielding.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing

D’Angela

Ercolino

Bellini

et al. 2020

Fatigue Fract Eng Mat Struct

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The damaging micromechanisms in a pearlitic (EN‐GJS700‐2) ductile cast iron (DCI) are investigated by means of scanning electron microscope (SEM) analysis and acoustic emission (AE) testing. Monotonic uniaxial tensile tests are performed on microtensile specimens under strain control. SEM analysis is applied under in situ conditions by means of a tensile holder. The multiple damaging micromechanisms are identified, and their evolution along with the mechanical response is characterised. The traditional AE features are found to be qualitatively correlated to the onset of the fracture damage over the elastic behaviour. The information entropy of the AEs evaluated according to both Shannon and Kullback‐Leibler formulations is proven to be well correlated to the ongoing damage and the incipient failure. Tentative failure criteria are finally proposed. The assessment approach is found to be promising for structural health monitoring purposes.

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Section: Introductionmentioning

confidence: 99%

Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing

D’Angela

Ercolino

Bellini

et al. 2020

Fatigue Fract Eng Mat Struct

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“…Only using AE signals to infer the extent of damage to 460 MPa HSS materials caused by strain aging effects remains a great challenge. Additionally, previous studies showed that the AE signals generated during the fracture process can reveal different stages of the materials during mechanical property tests (Kietov et al, 2019; Peng et al, 2018). Using the AE technique to study strain aging effects should not be limited to static specimens.…”

Section: Discussion and Prospectsmentioning

confidence: 99%

“…A signal exceeding a preset threshold is counted as ''one hit''. The AE signal between two hits that is below the threshold is not acquired (Kietov et al, 2019). Clearly, since AE counts, duration, rise time, and AE energy are related to a preset threshold, the results of AE signal processing are affected by the threshold value.…”

Section: Equipment and Data Acquisitionmentioning

confidence: 99%

Feasibility of studying 460 MPa high-strength steel affected by strain aging with acoustic emission method

Yang

Wang

2020

Advances in Structural Engineering

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Strain aging significantly influences the behavior of partially damaged structural steel. The effects of strain aging can be determined based on mechanical experiments, but the sampling process causes further damage to the structures. To explore the possibility of using nondestructive testing (NDT) technology to distinguish the strain aging effects on steel materials, this study investigates the characteristics of acoustic emission (AE) signals for high-strength steel (HSS) affected by strain aging. First, different strain aging effects were applied to 460 MPa HSS specimens. Second, pencil lead break (PLB) tests were performed on the specimens with strain aging, and the generated AE signals were recorded. Finally, tensile tests were conducted, that the strain aging effects on mechanical behavior were determined. The obtained AE signals were compared by extracting the AE parameters and analyzed in the frequency and time-frequency domains with a fast Fourier transform (FFT) and a wavelet transform (WT), respectively. The study shows that the strain aging effects change the characteristics of the AE signals. Compared to the prestrain, the aging time has a more pronounced impact on the AE behaviors. This research proposes a possible NDT method to determine the effects of strain aging on steel materials. Experimental data are provided to detect the degree of partial damage to 460 MPa HSS owing to strain aging using the AE method.

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“…Therefore, impact vibrations and material damage could be distinguished to determine the onset of unstable crack growth. Further information is given in [13,14].…”

Section: Fig 2 Setup For Dynamic Tensile Tests (Left) and Charpy Impact Tests (Right)mentioning

confidence: 99%

“…Based on parameters of the signal such as amplitude, duration and frequency, conclusions on the cause of acoustic emissions can be drawn. This has been studied recently on steel and nodular cast iron [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of ceramic particles on the dynamic strength, deformation and toughness behavior of 42CrMo4

et al. 2021

Self Cite

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In this study, the effect of non-metallic inclusions on the material behavior of 42CrMo4 was investigated. By adding aluminum oxide particles to steel powder, different inclusion contents were simulated. The mechanical and fracture toughness properties were measured under dynamic loading. The damage was examined using the acoustic emissions. With an increasing inclusion content, a decreasing strength, deformability and fracture toughness were observed. The distribution of the inclusions along the surfaces of the prior steel particles lead to small distances between inclusions and favors the initiation of cracks at low stress. The early appearance of material damage was proven by acoustic emissions.

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AE analysis of damage processes in cast iron and high-strength steel at different temperatures and loading rates

Cited by 11 publications

References 47 publications

Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing

Characterisation of the damaging micromechanisms in a pearlitic ductile cast iron and damage assessment by acoustic emission testing

Feasibility of studying 460 MPa high-strength steel affected by strain aging with acoustic emission method

Effect of ceramic particles on the dynamic strength, deformation and toughness behavior of 42CrMo4

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