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Material properties experiments using the awe high power laser, Helen by Rothman, S. D. (author);Evans, A. M. (author);Eagleton, R. T. (author);Pearson, L. B. (author) is a Engineering article available to read on EtoBox.

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In this report we discuss two experimental programmes recently carried out using the AWE 1 TW Nd-glass laser, HELEN, to determine the properties of materials under shock loading conditions relevant to hypervelocity impacts. In the first experiment a laser heated hohlraum is employed to generate a uniform steady planar shock which is used to derive high accuracy equation of state data using the impedance match method at pressures in excess of those generally available by conventional means and hitherto only achieved in the vicinity of nuclear explosions. The results are shown to be self consistent and reproducible and thus represent a significant new tool in the material modeler's arrnoury. In the second experiment direct laser illumination at lOI W.cm-' is used to generate an attenuating shock in an aluminium target. Direct evidence of a spa11 layer is obtained by means of x-ray backlighting for the first time in such laser driven experiments. A cumulative damage model is required to predict the spallation and a preliminary analysis shows that the Johnson model, with parameters derived from conventional experiments at much lower strain rates, can be used to predict the spa11 thickn

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Author

Rothman, S. D. (author);Evans, A. M. (author);Eagleton, R. T. (author);Pearson, L. B. (author)

Publisher

Elsevier Ltd

Published

1999

Language

EN

Field

Engineering (Physical Sciences)