Ejecta Transport, Breakup and Conversion

We report experimental results from an initial study of reactive and nonreactive metal fragments—ejecta—transporting in vacuum, and in reactive and nonreactive gases. We postulate that reactive metal fragments ejected into a reactive gas, such as H 2 , will break up into smaller fragments in situati...

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Bibliographic Details
Published in:Journal of dynamic behavior of materials 2017, Vol.3 (2), p.334-345
Main Authors: Buttler, W. T., Lamoreaux, S. K., Schulze, R. K., Schwarzkopf, J. D., Cooley, J. C., Grover, M., Hammerberg, J. E., La Lone, B. M., Llobet, A., Manzanares, R., Martinez, J. I., Schmidt, D. W., Sheppard, D. G., Stevens, G. D., Turley, W. D., Veeser, L. R.
Format: Article
Language:English
Subjects:
Breakup
Chemical effects
Chemistry and Materials Science
Ejecta
Ejection
Enthalpy
Fragmentation
Fragments
Gases
Infrared cameras
Infrared imaging
Materials Science
Metallic Materials
Piezoelectricity
Radiance
Solid Mechanics
Transducers
Transportation models
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Summary:We report experimental results from an initial study of reactive and nonreactive metal fragments—ejecta—transporting in vacuum, and in reactive and nonreactive gases. We postulate that reactive metal fragments ejected into a reactive gas, such as H 2 , will break up into smaller fragments in situations where they are otherwise hydrodynamically stable in a nonreactive gas such as He . To evaluate the hypothesis we machined periodic perturbations onto thin Ce and Zn coupons and then explosively shocked them to eject hot, micron-scale fragments from the perturbations. The ejecta masses were diagnosed with piezoelectric pressure transducers, and their transport in H 2 and He was imaged with visible and infrared (IR) cameras. Because Ce + H 2 ↦ CeH 2 + Δ H , where Δ H is the enthalpy of formation, an observed increase of the relative IR (radiance) temperature T R between the Ce–H 2 and Ce–He gas systems can be used to estimate the amount of Ce that converts to CeH 2 . The experiments sought to determine whether dynamic chemical effects should be included in ejecta-transport models.
ISSN:2199-7446
2199-7454
DOI:10.1007/s40870-017-0114-6