Fracture energy analysis via acoustic emission

Maslov, L. I.; Gradov, O. M.

doi:10.1016/0142-1123(86)90055-1

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…So, this is why AE signatures from crack propagation stage (AECP) show the highest AE RMS value because all AE signatures from this group is a discrete signal with high amplitude and energy. This phenomena had also been verified by what had been achieve by [3,9,10]. As been discussed, during the stage prior to crack initiation, it was believe that AE signatures were from microplastic formation, cyclic softening, and slip plane generation.…”

supporting

confidence: 62%

Acoustic Emission Behavior during Fatigue Crack of API5LX70 Gas Pipeline Steel

Yusof

Nizwan

Jamaludin

et al. 2011

AMM

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This paper present Acoustic Emission (AE) generated during fatigue mechanism of API5LX70 steel which was widely use as gas pipeline materials. Fully reverse (R=-1) constant amplitude fatigue test were done with four different stress amplitudes which were 437.5MPa, 406.25Mpa, 390.6MPa and 359.4MPa respectively. An observation from those tests shows that AE Count gives a significant value during cyclic softening and bauschinger effect. Crack initiation indicated by rapid increase of AE count values at positive peak stress and followed by high AE count values around zero stress which indicate crack closure phenomena. Among all four tests, it was show that AE activity from fatigue test with amplitude of 359.4MPa can be significantly divided into 3 region which correspond to crack incubation stage, microplastic and slip plane formation stage and crack initiation and propagation stage. Further analysis was done by separating AE signals from those 3 regions into 6 different groups. Ten AE signatures from each group were selected to calculate AE RMS and AE kurtosis. Analyses on AE RMS which correspond to overall energy of the signal were useful to indicate the microplastic and slip plane formation stage and crack initiation and propagation stage while AE kurtosis was useful in indicating crack stage including initiation, propagation and closure stage.

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supporting

confidence: 62%

Acoustic Emission Behavior during Fatigue Crack of API5LX70 Gas Pipeline Steel

Yusof

Nizwan

Jamaludin

et al. 2011

AMM

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“…Acoustic emissions are defined as stress or elastic waves produced by a material under external load (Skal's'kyi, Andreikiv, & Serhienko, 2003). Stored energy, rapidly released from within a material, can produce a wide range of acoustic signals (Kohn, 1995;Maslov & Gradov, 1986). The acoustic emissions can vary from a large number of low amplitude acoustic events to relatively few acoustic events of large amplitude (Bartenev & Fadeev, 1991;Maslov & Gradov, 1986;Ravi & Sethuramiah, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Stored energy, rapidly released from within a material, can produce a wide range of acoustic signals (Kohn, 1995;Maslov & Gradov, 1986). The acoustic emissions can vary from a large number of low amplitude acoustic events to relatively few acoustic events of large amplitude (Bartenev & Fadeev, 1991;Maslov & Gradov, 1986;Ravi & Sethuramiah, 1995). Since acoustic emissions are generated from within and transmitted through the substance, the acoustic signature provides insights into the physical and mechanical properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Analysis of pectin biopolymer phase states using acoustic emissions

Zheng

Pierce

Wagner

et al. 2020

Carbohydrate Polymers

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Acoustic emissions are stress or elastic waves produced by a material under external load. Since acoustic emissions are generated from within and transmitted through the substance, the acoustic signature provides insights into the physical and mechanical properties of the material. In this report, we used a constant velocity probe with force and acoustic emission monitoring to investigate the properties of glass phase and gel phase pectin films. In the gel phase films, a constant velocity uniaxial load produced periodic premonitory acoustic emissions with coincident force variations (saw-tooth pattern). SEM images of the gel phase microarchitecture indicated the presence of slip planes. In contrast, the glass phase films demonstrated early acoustic emissions, but effectively no force or acoustic evidence of periodic or premonitory emissions. Microstructural imaging of the glass phase films indicated the presence of early microcracks as well as dense polymerization of the pectin (without evidence of slip planes). We conclude that the water content in the pectin films contributes to not only the physical properties of the films, but also the stickslip motion observed with constant uniaxial load. Further, acoustic emissions provide a sensitive and practical measure of this mechanical behavior.

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“…In Figure 10(g), the time domain AE signatures from the AECC group show the lowest amplitude with a nearly similar shape to the AE2C group. During crack initiation, burst-type AE appeared with very high amplitude and energy (Ai et al, 2010;Maslov & 1986), while the AE burst from the crack closure phenomenon has lower amplitude (Lee, Rhyim, Kwon, & Ono, 1995;Chang et al, 2007). AE signatures from the AECP and AEOC groups have similar burst behaviour and shape but different amplitudes.…”

Section: Time Domain Ae Signatures Behaviourmentioning

confidence: 99%

Monitoring and Assessment of Acoustic Emission Signatures during Fatigue Mechanism of API5LX70 Gas Pipeline Steel

Fadhlan¹,

Kulthum²,

Abdullah³

et al. 2012

J MECH ENG SCI

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The detection of early fatigue phenomena in a gas pipeline is crucial in order to avoid catastrophic consequences. Therefore, appropriate inspection is needed to assess fatigue phenomena in a gas pipeline system. Acoustic emission (AE) technology is expected to be suitable in this regard. This paper presents the monitoring and assessment of AE signatures of the fatigue mechanism of gas pipeline material, API 5L X70 steel. The stress amplitude of 65%, 60%, 58% and 53% of the ultimate tensile strength were done in order to observe AE activity during the fatigue mechanism. Field measurements were also done by investigating AE signatures of an operational gas pipeline for comparison purposes. Based on the correlation of the AE signatures and fatigue mechanism, it was found that the AE activities generated during the fatigue mechanism were divided into three different stages. Analysis of the AE features and statistical parameters have shown that the kurtosis values of the time domain AE signatures from the third stage of the fatigue mechanism were different from the field measurements. This results show that the application of the kurtosis was expected to be able to detect the time domain AE signatures from the crack stage.

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Fracture energy analysis via acoustic emission

Cited by 12 publications

References 2 publications

Acoustic Emission Behavior during Fatigue Crack of API5LX70 Gas Pipeline Steel

Acoustic Emission Behavior during Fatigue Crack of API5LX70 Gas Pipeline Steel

Analysis of pectin biopolymer phase states using acoustic emissions

Monitoring and Assessment of Acoustic Emission Signatures during Fatigue Mechanism of API5LX70 Gas Pipeline Steel

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