The interaction of fatigue cracks with a residual stress field using thermoelastic stress analysis and synchrotron X-ray diffraction experiments

Amjad, Khurram; Asquith, David; Patterson, E. A.; Sebastian, Christopher; Wang, Wei-Chung

doi:10.1098/rsos.171100

Cited by 9 publications

(7 citation statements)

References 44 publications

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“…9)an exfoliation of carbon from TiC; a mechanism that can be referred to as stress-relaxation induced mechanical exfoliation. Residual stress relaxation triggered by the superposition of an external stress [10] as well as mechanical exfoliation of graphite from carbon-based material [25] have already been reported elsewhere. It appears that stress relaxation led to bond relaxation in TiC which possesses a weaker Ti-C atom covalent bonding as compared to the very strong tetrahedral Si-C atom covalent bonding in SiC [26] making it easy for carbon to be exfoliated preferentially from TiC during the sliding contact.…”

Section: Transmission Electron Microscopymentioning

confidence: 54%

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Ramification of thermal expansion mismatch and phase transformation in TiC-particulate/SiC-matrix ceramic composite

Magnus

Sharp

et al. 2020

Ceramics International

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This article presents a microstructural study on the role of incipient residual stress relaxation in TiC-particulate/SiC-matrix ceramic composite toughened by thermal expansion mismatch and phase transformation toughening. Exhaustive microstructural studies was undertaken using scanning electron microscopy and transmission electron microscopy following a wear test. It was found that the superposition of hydrostatic tensile stress induced at the surface following the sliding contact on the inherent residual stresses locked in the composite led to a relaxation and/or reduction in the residual stresses. Stress relaxation presented a wider implication for the tribological properties of this ceramic matrix composite (CMC) in the form of a grain-scale rippling microstructural phenomena. Dear Editor,Many thanks for the opportunity to address the reviewers comments and recommendations. All latest corrections that have been carried out in the manuscript are highlighted in red text below the reviewers comment. Reviewers' comments:1. In the article title, SiC-TiC ceramic matrix could be added to clarify the research object of this article.This has now been included in the title as advised 2. It was suggested some references that research on SiC based ceramic matrix could be added, like Ceramics International 46 (2020) 5159-5167 and so on.This reference has now been included as advised 3. Please confirm if there is any sintering additive during the SPS process.No sintering additives was employed and this has now been stated in the manuscript 4. Please add the heating rate of SPS process.Heating rate 100 °C/min was employed and has been stated in the manuscript 5. It was suggested that a XRD result can be added in the article to investigate the phase transformation in larger scale than TEM.XRD result has now been added to highlight phase transformation 6. It was suggested that the thermal expansion data of SiC and TiC could be added in the article.A table showing thermal expansion data of all the phases in the composite system has now been added to the manuscript

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Section: Transmission Electron Microscopymentioning

confidence: 54%

“…Stresses developed as a result of particle-matrix thermal mismatch and/or phase transformation can significantly influence the degree of crack-particle interaction [1,10].…”

Section: Introductionmentioning

confidence: 99%

Ramification of thermal expansion mismatch and phase transformation in TiC-particulate/SiC-matrix ceramic composite

Magnus

Sharp

et al. 2020

Ceramics International

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“…The instants at which a permanent significant increase in the Euclidean distance relative to its baseline value were found, using the method described in §2.4, to be 4 and 7.5 h for the cooled photovoltaic effect detector and the prototype unit, respectively. It has been established from previous fatigue studies [13,20,33] on similar open-hole aluminium alloy specimens that the FLIR IR photovoltaic effect detector is capable of detecting a sub-millimetre crack. There is a linear increase in the Euclidean distance between 4 and 7.5 h in the plot for the photovoltaic effect detector (figure 5), which indicates the initiation and extension of a short crack causing a change in the elastic stress field.…”

Section: Resultsmentioning

confidence: 99%

A thermal emissions-based real-time monitoring system for in situ detection of fatigue cracks

et al. 2022

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The advent of packaged infrared (IR) bolometers has led to thermography-based techniques becoming popular for non-destructive evaluation of aerospace structures. In this work, a real-time monitoring system for in situ crack detection has been presented which uses an original equipment manufacturer microbolometer. The system costs one-tenth the price of a packaged bolometer and has the potential to transform the use of IR imaging for condition and structural health monitoring in the aerospace industry and elsewhere. A computer, consisting of a single circuit board with dimensions comparable to a credit card, has been integrated into the system for real-time, on-board data processing. Crack detection has been performed based on the principles of thermoelastic stress analysis (TSA). Proof-of-concept laboratory tests were performed on open-hole aluminium specimens to compare the performance of the proposed system against a state-of-the-art cooled IR photovoltaic effect detector. It was demonstrated that cracks as small as 1 mm in length can be detected with loading frequencies as low as 0.3 Hz. This represents a significant advance in the viability of TSA-based crack detection in large-scale structural tests where loading frequencies are usually lower than 1 Hz.

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“…Essentially, it further promotes crack propagation under lower stress, and eventually fracture and failure will also be generated. 9,10 In engineering applications, the fatigue fracture of mechanism is irregular, which brings many inconveniences to the implementation of damage detection and fault diagnosis. Therefore, the damage monitoring of material is immensely concentrated on qualitatively and quantitatively detecting the fatigue crack of materials, assessing and predicting the damage degree accurately, and preventing the occurrence of fatigue failure.…”

Section: Introductionmentioning

confidence: 99%

Structural damage monitoring for metallic panels based on acoustic emission and adaptive improvement variational mode decomposition–wavelet packet transform

2021

Structural Health Monitoring

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The metallic panel acoustic emission signal with strong non-stationary properties is normally composed of multiple components (e.g. impulses, background noise, and other external signal), where impulses relevant to metallic panel are easily contaminated by background noise and other external signal, making it difficult to excavate the inherent acoustic emission signal features. To address this issue and achieve the damage monitoring of metallic panels based on acoustic emission technology, a new scheme based on adaptive improvement variational mode decomposition–wavelet packet transform is developed for extracting acoustic emission signal features of metallic panels. Specifically, three different dimensions of Q235B steel plates are utilized to collect acoustic emission signal during three-point bending experiments, to evaluate the effectiveness of the proposed approach and to investigate the influence of size effect on the acoustic emission signal characteristics. In addition, the transient process and centroid frequency distribution of each damage stage are investigated, and the internal structure variations in the bending damage process are detected by scanning electron microscopy inspection. Moreover, the generalization of the proposed damage monitoring method is evaluated for plate-like structures that have complex geometric features, such as welds. The results demonstrate the effectiveness of the proposed method for acoustic emission–based structural health monitoring of metallic plate-like structures.

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The interaction of fatigue cracks with a residual stress field using thermoelastic stress analysis and synchrotron X-ray diffraction experiments

Cited by 9 publications

References 44 publications

Ramification of thermal expansion mismatch and phase transformation in TiC-particulate/SiC-matrix ceramic composite

Ramification of thermal expansion mismatch and phase transformation in TiC-particulate/SiC-matrix ceramic composite

A thermal emissions-based real-time monitoring system for in situ detection of fatigue cracks

Structural damage monitoring for metallic panels based on acoustic emission and adaptive improvement variational mode decomposition–wavelet packet transform

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