High-Temperature Fatigue Crack Growth Study of P91 Steel Using Acoustic Emission

Babu, M. Nani; Mukhopadhyay, C. K.; Sasikala, G.

doi:10.1007/s11837-021-04879-5

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The count rate is another AE feature studied to understand the transition from stage 1 to stage 2. Babu et al (2021) showed that there is a peak in the AE count rate curve in the transition region from stage 1 to stage 2. Similar to cumulative count behavior, this AE feature requires prior knowledge of AE loading history to detect the transition stage.…”

Section: Ae Features Of Fatigue Crack Monitoringmentioning

confidence: 99%

The dependence of acoustic emission behavior on prior fatigue loading history

Ozevin

2022

Front. Built Environ.

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Fatigue cracks are a major concern for aging metallic structures, as they can cause unexpected catastrophic failure. They often occur on hidden surfaces, e.g., under paint and rust or on the interface between two structural layers, which makes visual detection difficult. Acoustic Emission (AE) is a passive nondestructive evaluation (NDE) method that measures the initiation and progression of defects when a structure is continuously monitored. While using this method, which has been successfully applied to monolithic and composite structures, the fatigue life is related to the cumulative AE count. However, if the method is applied after the fatigue crack is initiated, the relationship between the fatigue life and the cumulative AE count may not be applicable. In this paper, the dependence of AE behavior on the prior fatigue loading history is studied using modified compact tension specimens. The cumulative AE count, AE correlation plots, and waveform characteristics are shown to be dependent on loading conditions in addition to the coupling state. Relative behaviors between AE sensors and trends in the cumulative AE count are illustrated by two AE characteristics that are shown as being independent of prior loading history and coupling discontinuities.

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Section: Ae Features Of Fatigue Crack Monitoringmentioning

confidence: 99%

The dependence of acoustic emission behavior on prior fatigue loading history

Ozevin

2022

Front. Built Environ.

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A novel ultrasonic non-destructive testing methodology to monitor fatigue crack growth in compact tension specimens

Abraham

Babu

Venkatraman

2023

Review of Scientific Instruments

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Detection and evaluation of fatigue cracks in structural materials are extremely important for life prediction analysis as part of the structural integrity procedure. In this article, we present a novel ultrasonic measurement methodology, based on the diffraction of elastic waves at the crack tips, to monitor the fatigue crack growth near the threshold regime in compact tension specimens at different load ratios. The diffraction phenomenon of ultrasonic waves from the crack tip is demonstrated using a finite element 2D wave propagation simulation. The applicability of this methodology has also been contrasted with that of the conventional direct current potential drop method. In addition, the crack morphology obtained in the ultrasonic c-scan imaging showed a variation in the crack propagation plane as a function of the cyclic loading parameters. The results suggest that this novel methodology is sensitive to fatigue cracks and can form the basis of in situ ultrasonic-based crack measurements in metallic and non-metallic materials.

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High-Temperature Fatigue Crack Growth Study of P91 Steel Using Acoustic Emission

Cited by 2 publications

References 17 publications

The dependence of acoustic emission behavior on prior fatigue loading history

The dependence of acoustic emission behavior on prior fatigue loading history

A novel ultrasonic non-destructive testing methodology to monitor fatigue crack growth in compact tension specimens

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