Dense gas boundary layer experiments: Visualization, pressure measurements, concentration evaluation

Reichenbach, H.; Neuwald, P.; Kuhl, A. L.

doi:10.2172/10181194

Cited by 1 publication

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“…In materials science and applied materials research, the behavior of materials is investigated in a wide array of timescales and strain rates. Although the precision and the predictive capability of simulations has steadily improved, physical experiments and their analysis remain the central approach to understanding the underlying effects [1]. One of the most difficult aspects of experimental materials science is to investigate metals, ceramics, compound or other materials in the highly dynamic range (speeds up to several km s −1 ).…”

Section: Introductionmentioning

confidence: 99%

In situflash x-ray high-speed computed tomography for the quantitative analysis of highly dynamic processes

Moser

Nau

Salk

et al. 2014

Meas. Sci. Technol.

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The in situ investigation of dynamic events, ranging from car crash to ballistics, often is key to the understanding of dynamic material behavior. In many cases the important processes and interactions happen on the scale of milli- to microseconds at speeds of 1000 m s−1 or more. Often, 3D information is necessary to fully capture and analyze all relevant effects. High-speed 3D-visualization techniques are thus required for the in situ analysis. 3D-capable optical high-speed methods often are impaired by luminous effects and dust, while flash x-ray based methods usually deliver only 2D data. In this paper, a novel 3D-capable flash x-ray based method, in situ flash x-ray high-speed computed tomography is presented. The method is capable of producing 3D reconstructions of high-speed processes based on an undersampled dataset consisting of only a few (typically 3 to 6) x-ray projections. The major challenges are identified, discussed and the chosen solution outlined. The application is illustrated with an exemplary application of a 1000 m s−1 high-speed impact event on the scale of microseconds. A quantitative analysis of the in situ measurement of the material fragments with a 3D reconstruction with 1 mm voxel size is presented and the results are discussed. The results show that the HSCT method allows gaining valuable visual and quantitative mechanical information for the understanding and interpretation of high-speed events.

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Section: Introductionmentioning

confidence: 99%