Lagrangian analysis. Modern tool of the dynamics of solids

High-Speed Laser-Launched Flyer Impacts Studied with Ultrafast Photography and Velocimetry

“…a The time interval Dt 1 between the launch pulse in PD 1 and the PDV was determined by aligning the PDV beam on a mirror with a thin Cr coating and ablating away the coating with the launch laser to cause a sudden decrease in the PDV signal. b The time Dt 2 between the launch pulse and the strobe pulse was determined by inserting PD 3 at the location of the ICCD camera (Fig. 3).…”

“…The flyer plate optic substrates and target windows were borosilicate glass 50 9 50 9 6.35 mm 3 , from Chemglass, mounted in a vacuum cell with a gap determined by the number of nominally 125 lm thick plastic spacers used or by a single stainless steel spacer (Fig. 3).…”

“…But for precision measurements in shock compression science and shock wave spectroscopy, where one-dimensional shock compression is vital [3,4], flyer plate impacts with targets must be as sudden as possible, with a high degree of flatness and minimal tilt, and the flyer speeds and impact times at the target must be reproducible. In light gas guns, where long projectiles and precisionmachined bores can be used, impact tilts of 3.5 mrad [5] and 0.9 mrad have been measured [6,7].…”

Exploration of CdTe quantum dots as mesoscale pressure sensors via time-resolved shock-compression photoluminescent emission spectroscopy

“…Studies of these two types of matrix media, hereafter referred to as "polymer" and "glass," respectively, are also relevant for the understanding of the response of two widely-used embedded shock sensors, namely, the polyvinylidene fluoride polymer (PVDF) 14 and quartz stress gauges. 15 In addition to matrix effects, many other issues need to be addressed and understood prior to the possible use of QDs as pressure sensors for in situ probing of the shockcompression response of heterogeneous materials. The QD structure and surface chemistry need to be tuned to maintain compatibility with the media of interest.…”

On the characterisation of the dynamic compressive behaviour of silicon carbides subjected to isentropic compression experiments

“…Using this generator, the same compressive pulse is applied on the two electrodes. a Corresponding author: jeanluc.zinszner@3sr-grenoble.fr Thus, by performing a compression experiment on two samples of a same material with different thicknesses, one can use the lagrangian analysis method [6]. This method integrates the conservation equations (mass, momentum, energy) between two velocity signals measured on ceramic samples with different thicknesses and allows accessing to the whole loading path without any assumption.…”