Stress Corrosion Cracking

Popov, Branko N.

doi:10.1016/b978-0-444-62722-3.00009-4

Cited by 10 publications

(6 citation statements)

References 179 publications

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“…They found that the first kind of event can be seen up to a few Mpc (therefore in M82, M83, NGC253 and NGC4945), while the second can in principle be visible up to the Virgo cluster. However, as already noted by Popov & Stern (2006), this prediction may be too optimistic, since no evidence has been found for an excess of BATSE short GRBs from the direction of M82, M83, NGC253 and NGC4945, nor from the Virgo cluster (Palmer et al, 2005). Similarly, negative results have been reported by Lazzati et al (2005); Tanvir et al (2005), and overall these studies suggest that no more than a few percent, maybe up to ∼ 8% of the short GRBs seen by BATSE could be giant flares from extragalactic SGRs (see also Hurley et al, 2005;Crowther et al, 2011;Svinkin et al, 2015, the latter for a recent update on the detection upper limits).…”

Section: Magnetars Formationsupporting

confidence: 53%

“…Magnetars would be, then, the endpoint of the evolution of massive stars energy released in the flare and in the spectral properties of the narrow peak. By considering the flare emitted by SGR 1806-20 and by varying the assumptions about the peak spectral shape, Popov & Stern (2006) computed the possibility of detection by BATSE of giant flares with an energy of 10 44 or 10 46 erg, as a function of the distance. They found that the first kind of event can be seen up to a few Mpc (therefore in M82, M83, NGC253 and NGC4945), while the second can in principle be visible up to the Virgo cluster.…”

Section: Magnetars Formationmentioning

confidence: 99%

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Magnetars: the physics behind observations. A review

2015

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Magnetars are the strongest magnets in the present universe and the combination of extreme magnetic field, gravity and density makes them unique laboratories to probe current physical theories (from quantum electrodynamics to general relativity) in the strong field limit. Magnetars are observed as peculiar, burst-active x-ray pulsars, the anomalous x-ray pulsars (AXPs) and the soft gamma repeaters (SGRs); the latter emitted also three 'giant flares', extremely powerful events during which luminosities can reach up to 10(47) erg s(-1) for about one second. The last five years have witnessed an explosion in magnetar research which has led, among other things, to the discovery of transient, or 'outbursting', and 'low-field' magnetars. Substantial progress has been made also on the theoretical side. Quite detailed models for explaining the magnetars' persistent x-ray emission, the properties of the bursts, the flux evolution in transient sources have been developed and confronted with observations. New insight on neutron star asteroseismology has been gained through improved models of magnetar oscillations. The long-debated issue of magnetic field decay in neutron stars has been addressed, and its importance recognized in relation to the evolution of magnetars and to the links among magnetars and other families of isolated neutron stars. The aim of this paper is to present a comprehensive overview in which the observational results are discussed in the light of the most up-to-date theoretical models and their implications. This addresses not only the particular case of magnetar sources, but the more fundamental issue of how physics in strong magnetic fields can be constrained by the observations of these unique sources.

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Section: Magnetars Formationsupporting

confidence: 53%

Section: Magnetars Formationmentioning

confidence: 99%

Magnetars: the physics behind observations. A review

2015

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“…Indeed, motivated by the strong correlation of the proposed DoH index with respect to the crack length (as previously discussed in Section 4.1 ), an estimation of the stress intensity factor could also be provided as long as the crack growth rate was predicted. This estimation could be particularly useful for an efficient characterization of the structure under consideration, for example, to provide the stress state at a crack tip and to establish a fracture failure criterion [ 61 ]. In this sense, additional future lines of work are under consideration regarding data normalization and damage classification.…”

Section: Discussionmentioning

confidence: 99%

Structural Health Monitoring Using Ultrasonic Guided-Waves and the Degree of Health Index

Cantero‐Chinchilla

Aranguren

Royo

et al. 2021

Sensors

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This paper proposes a new damage index named degree of health (DoH) to efficiently tackle structural damage monitoring in real-time. As a key contribution, the proposed index relies on a pattern matching methodology that measures the time-of-flight mismatch of sequential ultrasonic guided-wave measurements using fuzzy logic fundamentals. The ultrasonic signals are generated using the transmission beamforming technique with a phased-array of piezoelectric transducers. The acquisition is carried out by two phased-arrays to compare the influence of pulse-echo and pitch-catch modes in the damage assessment. The proposed monitoring approach is illustrated in a fatigue test of an aluminum sheet with an initial notch. As an additional novelty, the proposed pattern matching methodology uses the data stemming from the transmission beamforming technique for structural health monitoring. The results demonstrate the efficiency and robustness of the proposed framework in providing a qualitative and quantitative assessment for fatigue crack damage.

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“…The LME defect is essentially a type of stress corrosion cracking, which can be described by Galvele's atomic surface mobility (ASM) model, as shown in Figure 7. According to this model, the crack propagates through the diffusion of metal and ions from the crack tip to the crack wall surface (Popov 2015). Fredriksson, Hansson, and Olsson (2001) proposed the formation mechanism of LME-induced cracks in an Fe-Cu system.…”

Section: Lmementioning

confidence: 99%

Recent progress and scientific challenges in multi-material additive manufacturing via laser-based powder bed fusion

Wei¹,

Li²

2021

Virtual and Physical Prototyping

157

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Multi-material additive manufacturing provides a new route for fabricating components with tailored physical properties. Laser-based powder bed fusion (L-PBF), also known as selective laser melting, is a powder bed-based additive manufacturing technology. This technology affords the advantage of manufacturing metallic and non-metallic materials with high geometrical resolution. An emerging field relevant to the foregoing is multi-material L-PBF. This paper reviews the latest progress in this field including multiple material powder deposition mechanisms, molten pool behaviour, process characteristics of printing metal-metal, metal-ceramic, and metal-polymer multiple material components, and potential applications. Finally, scientific and technological challenges are presented.

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Stress Corrosion Cracking

Cited by 10 publications

References 179 publications

Magnetars: the physics behind observations. A review

Magnetars: the physics behind observations. A review

Structural Health Monitoring Using Ultrasonic Guided-Waves and the Degree of Health Index

Recent progress and scientific challenges in multi-material additive manufacturing via laser-based powder bed fusion

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