A large program hat been led in Vaujows since 1981 to provide a highly reproducible PVF2 gauge which can be used in detonics e x p r i m e n s in view of h e -a n i v a l recording of sbong shock waves and shock pressure detennmation.The transducer known as PVF2 (polyvinylidcnc fluoride) is a thin poliriicd sheet of polymer plastic which contains its own source of encrgy and docs not require my external power supply.But for some applications on high explosives it could be neccssary to perform stress strain measuTementS in ineri or rcactiw m d i a with thinner acti\,c gauges (thickness 100 pm M less) which do not require any eitcrnal ~w c r supply Over the last few yean. ow laboratory has k e n engagd in a great effort lo study the properties of the piezoelecuic polymer film PVFZ under high shock pressure loading and to design a new gauge with highly reproducible respmw in the 0-100 kibbarrange.The purpose of this communication is to present thc shock comprcssiun response of a 2 mm x 2 mm active area PVF2 gauge. The din& iespwwc is studied b o h on a 0 30 mm powder gun and with a plane wave lens of high c i p l o 5 i i e coupled to ceramic attenuators. GAUGES DESIGN ASD F.ZBRIC,ITIO\;The Kurehn polyvinylidene fluoride resine (PVFZ) has been biaxiiilly stretched to produce a polar crystalline phase (the phue). The 23 pi11 thicknc\s film is then sputlered with copper strip electrodes realired by evaporalicn uridsr vacuum technique. The shapc of h e electrodes is matched 10 the experiincl:ti sctup. For each calibration experiment. 6 gauges of 2 mm x 2 nun active area havc teen llsed on a 0 15 mm diameter by sputtering 12 electrodes (figure I).In 1969 KAWAI (1) found out h a t this material becomes strongly piez~electric after having undergone mechanical stretching and under action of an electric field.The behavior of this material when shock loaded has been studied by several authors 121. [3]. (41, 151. We present in this communication h e ldst results obtained with 23 pm gauges working in the 0-160 kbar range. For the stress range below 100 kbar we have been working with a 30 mm powder gun. Over 100 kbar the experimental arrangement consists in an cxplostvc plmc wave lens coupled to ceramic barrier attenuators. For each peak shack rut\(. h gauges. each coupled U, two high bandwidth transient digitircrr. h3.1'~ hscn ucsd Figure 1: The CEA PVF2 gauges The measllrements have been carried out with an accuracy of less lhan I 5 4, below 100 kbar. Calibration curve giving the shock pressure w r s u ? 1115 efficieixy of the gauge (rcleased chargchitial charge) will be prcwixcd A comparison betueen polymer. manganin and c a r h x g~~i g c s x ill -c shown. Polcnlial capacity of PVF? gauges for follou ing proi.Ic, d \ ! v L ' h ;,re\\L:< will he h e n disfussed. IS T R 0 D L CT IO K The development of &tonalion scicncc and cxploriie Cii., I L~, :i ! i l~~c d r?:i mcasuremenls describing the detonation process or the r,:culting sa:;> ;)ulis; produced by h e explosion. If we except particle or free surface vclocity mcasJrcmsnts...
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