Grating-based X-ray dark-field computed tomography for the characterization of friction stir welds: A feasibility study

Schaff, Florian; Bachmann, Andreas; Zens, Amanda; Zaeh, Michael F.; Pfeiffer, Franz; Herzen, Julia

doi:10.1016/j.matchar.2017.04.023

“…Based on the investigations of SCHAFF ET AL. [17], it was presumed that a significant change in microstructure induced by the welding process could lead to a detectable change of the attenuation of X-rays when passing through a sample. As part of a preliminary experimental series, weld specimens were examined using a µCT device with respect to material qualification.…”

Section: Discussionmentioning

confidence: 99%

“…X-ray dark-field CT was used to investigate microstructural changes induced in macroscopically homogeneous materials during friction stir welding. The imaging technique provided threedimensional information about the microstructure of the welds on a macroscopic scale [17].…”

Section: Offline Characterization Of the Weld Seam Geometry And Weld Defectsmentioning

confidence: 99%

A Novel Approach to the Holistic 3D Characterization of Weld Seams – Paving the Way for Deep Learning-Based Process Monitoring

Schmoeller

¹

,

Stadter

²

,

Kick

³

et al. 2021

Preprint

4

0

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

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“…Since titanium and aluminum possess different linear attenuation coefficients, the XCT is used to visualize the distribution of different phases [21], such as Ti and Al, in the scanned area of the weld sample. For example, in the FSW of Al to Ti with a niobium (Nb) interlayer, Kar et al [4] used XCT techniques to demarcate the distribution and morphology of Ti and Nb.…”

Section: X-ray Computed Tomographymentioning

confidence: 99%

A new method to elucidate fracture mechanism and microstructure evolution in titanium during dissimilar friction stir welding of aluminum and titanium

Kar

¹

,

Malopheyev

²

,

Mironov

³

et al. 2021

Materials Characterization

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…X-ray dark-field CT was used to investigate microstructural changes induced in macroscopically homogeneous materials during friction stir welding. The imaging technique provided three-dimensional information about the microstructure of the welds on a macroscopic scale [17].…”

Section: State Of the Art 21 Offline Characterization Of The Weld Seam Geometry And Weld Defectsmentioning

confidence: 99%

“…Figure 4). The materials were evaluated to determine the extent to which changes in the microstructure caused by welding resulted in a detectable change in the attenuation of the radiation from the µCT, according to the investigations of Schaff et al [17]. The alloy AA 2219 was selected for further analyses as it allowed a complete visuali-zation of the weld geometry inside the specimens.…”

Section: Materials and Experimental Set-upmentioning

confidence: 99%

A Novel Approach to the Holistic 3D Characterization of Weld Seams—Paving the Way for Deep Learning-Based Process Monitoring

Schmoeller

¹

,

Stadter

²

,

Kick

³

et al. 2021

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

Grating-based X-ray dark-field computed tomography for the characterization of friction stir welds: A feasibility study

Cited by 16 publications

References 31 publications

A Novel Approach to the Holistic 3D Characterization of Weld Seams – Paving the Way for Deep Learning-Based Process Monitoring

A Novel Approach to the Holistic 3D Characterization of Weld Seams – Paving the Way for Deep Learning-Based Process Monitoring

A new method to elucidate fracture mechanism and microstructure evolution in titanium during dissimilar friction stir welding of aluminum and titanium

A Novel Approach to the Holistic 3D Characterization of Weld Seams—Paving the Way for Deep Learning-Based Process Monitoring

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