Brittle Crack Propagation/Arrest Behavior in T-Joint Structure of Heavy Gauge Steel Plates

Handa, Tsunehisa; Nishimura, K.; Shiomi, Hiroshi; Tsuyama, Seishi

doi:10.4028/www.scientific.net/msf.706-709.914

Cited by 5 publications

(7 citation statements)

References 3 publications

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“…The results are consistent with other observations in the literature at the same frequency. We analysed further observations at 8, 10, and 14 GHz (Langston et al (2000), Handa et al (1987)), which, however, were excluded owing to the low S/N ratio.…”

Section: Ancillary Datamentioning

confidence: 99%

Detailed study of the microwave emission of the supernova remnant 3C 396

Cruciani¹,

Battistelli²,

Carretti³

et al. 2016

Mon. Not. R. Astron. Soc.

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We have observed the supernova remnant 3C 396 in the microwave region using the Parkes 64-m telescope. Observations have been made at 8.4 GHz, 13.5 GHz, and 18.6 GHz and in polarisation at 21.5 GHz. We have used data from several other observatories, including previously unpublished observations performed by the Green Bank Telescope at 31.2 GHz, to investigate the nature of the microwave emission of 3C 396. Results show a spectral energy distribution dominated by a single component power law emission with α = (−0.364 ± 0.017). Data do not favour the presence of anomalous microwave emission coming from the source.Polarised emission at 21.5 GHz is consistent with synchrotron-dominated emission. We present microwave maps and correlate them with infrared (IR) maps in order to characterise the interplay between thermal dust and microwave emission. IR vs. microwave TT plots reveal poor correlation between mid-infrared and microwave emission from the core of the source. On the other hand, a correlation is detected in the tail emission of the outer shell of 3C 396, which could be ascribed to Galactic contamination.

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Section: Ancillary Datamentioning

confidence: 99%

Detailed study of the microwave emission of the supernova remnant 3C 396

Cruciani¹,

Battistelli²,

Carretti³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…In addition to these data, we performed an integrated flux density analysis on the GBT data (8.35 GHz, and 14.5 GHz) by Langston et al (2000), as well as the Nobeyama 10 GHz data by Handa et al (1987), which have been considered in the analysis of the integrated flux density for the RCW175 HII region. These data, however, are affected by significant systematics on angular scales that are important for our study.…”

Section: Radio and Microwave Ancillary Datamentioning

confidence: 99%

New Radio Observations of Anomalous Microwave Emission in the H Ii Region Rcw175

Battistelli

Carretti

Cruciani

et al. 2015

ApJ

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We have observed the HII region RCW175 with the 64-m Parkes telescope at 8.4 GHz and 13.5 GHz in total intensity, and at 21.5 GHz in both total intensity and polarization. High angular resolution ranging from 1 arcmin to 2.4 arcmin, high sensitivity, and polarization capability enable us to perform a detailed study of the different constituents of the HII region. For the first time, we resolve three distinct regions at microwave frequencies, two of which are part of the same annular diffuse structure. Our observations enable us to confirm the presence of anomalous microwave emission from RCW175. Fitting the integrated flux density across the entire region with the currently available spinning dust models, using physically motivated assumptions, indicates the presence of at least two spinning dust components: a warm component (T gas = 5800 K) with a relatively large hydrogen number density n H = 26.3/cm 3 and a cold component (T gas = 100 K) with a hydrogen number density of n H = 150/cm 3 . The present study is an example highlighting the potential of using high angular-resolution microwave data to break model parameter degeneracies. Thanks to the spectral coverage and angular resolution of the Parkes observations, we have been able to derive one of the first anomalous microwave emission/excess maps, at 13.5 GHz, showing clear evidence that the bulk of the anomalous emission arises in particular from one of the source components, with some additional contribution from the diffuse structure. A cross-correlation analysis with thermal dust emission has shown a high degree of correlation with one of the regions within RCW175. In the center of RCW175, we find an average polarized emission at 21.5 GHz of 2.2±0.2(rand.)± 0.3(sys.)% of the total emission, where we have included both systematic and statistical uncertainties at 68% CL. This polarized emission could be due to subdominant synchrotron emission from the region and is thus consistent with very faint or non-polarized emission associated with anomalous microwave emission.

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“…3 Brittle crack propagation/arrest behavior in full penetration T-joint [21,22] 3.1 Experimental method…”

Section: Effect Of Unwelded Face On Stress Intensity Factor Of Crack mentioning

confidence: 99%

“…This paper presents a comprehensive summary of the results of the experimental research and analyses [18][19][20][21][22][23] by the authors to date.…”

Section: Introductionmentioning

confidence: 98%

“…In another previous study [21,22], we investigated and analyzed the effect of the K ca value on brittle crack propagation/arrest behavior in full penetration T-joints with the aim of arresting brittle cracks at T-joints by enhancing the crack arrestability of the steel plate. An ESSO test and FEM analysis of the T-joint structure were carried out, supposing that a brittle crack which propagates along a weld joint of a hatch coaming penetrates suddenly into the T-joint of the hatch coaming and strength deck.…”

Section: Introductionmentioning

confidence: 99%

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Brittle crack propagation/arrest behavior in T-joint structure of heavy gauge steel plate

Handa

Igi

et al. 2015

Weld World

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Brittle crack arrestability is extremely important in welded joints of heavy gauge steel plates used in large container ships. Recently, much attention has been focused on potential crack propagation along welds fabricated by large heat input welding. This paper examines the application of a T-joint to the strength deck structure of container ships to enhance crack arrestability. The unwelded face and the crack arrest toughness, K ca , for crack arrest were varied. In the case of a T-joint with an unwelded face, the ESSO test of the T-joint components showed that a brittle crack arrested at the T-joint embedding the unwelded face. In the case of a full penetration T-joint, the brittle crack was arrested if the steel plate used for the flange had a high K ca value in the range from 4900 to 7300 N/mm 3/2 . FEM analysis of the stress intensity factor K indicated that brittle crack propagation was arrested under the condition that the K value at the running crack tip was less than the K ca of the material. In the T-joint, it was noted that the K value around the deepest point of the crack decreased and was finally less than the K ca of the flange plate when the brittle crack penetrated into the flange plate. This phenomenon shows the advantage of using a T-joint for brittle crack arrest in the flange plates of strength deck structures.In order to verify the long brittle crack arrestability of the Tjoint structure, ultra-large-scale tests were carried out under the recommended conditions obtained from a dynamic FEM analysis. The test results showed that long brittle cracks could arrest at the aforementioned T-joint structures.

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Brittle Crack Propagation/Arrest Behavior in T-Joint Structure of Heavy Gauge Steel Plates

Cited by 5 publications

References 3 publications

Detailed study of the microwave emission of the supernova remnant 3C 396

Detailed study of the microwave emission of the supernova remnant 3C 396

New Radio Observations of Anomalous Microwave Emission in the H Ii Region Rcw175

Brittle crack propagation/arrest behavior in T-joint structure of heavy gauge steel plate

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