Piezoelectric Polymer Shock Gauges

Bauer, F.

doi:10.1063/1.2263535

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…For some applications, such as hydrophones (under water sonar detectors), polymers are better suited than ceramics because of their excellent impedance matching with water [26]. Other common uses include pressure sensors in diesel injection lines and shock wave sensors [27,28]. Therefore, there is a much interest in the industry regarding the development of new piezoelectric polymers with a much better thermal stability for applications at temperatures higher than 100 °C.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications

Maceiras¹,

Martins²,

Sebastián³

et al. 2014

Smart Mater. Struct.

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A series of amorphous polyimides and copolyimides that contained nitrile were obtained by a two-step procedure. The first step consisted of a polycondensation reaction of 4,4'-oxydiphtalic anhydride (ODPA) with one or two aromatic diamines, namely 1,3-Bis-2-cyano-3-(3aminophenoxy)phenoxybenzene (diamine 2CN) and 1,3-Bis(3-aminophenoxy)benzene (diamine 0CN). In the second step, a thermal cyclodehydration converted each poly(amic acid) or copoly (amic acid) into their corresponding polyimide films. The piezoelectric response was improved after corona poling of the films. A maximum d 33 modulus value of 16 pC N −1 was obtained for the polymide with two cyano groups (poly 2CN). The polarization also showed time and thermal stability up to 160 °C. Additionally, the thermal stability of the amorphous polyimides, (β-CN) APB/ODPA, was studied by determining the glass transition temperature (T g ) and thermal decomposition through differential scanning calorimetry (DSC) and thermogravimetric analysis (TG), respectively. The high piezoelectric response (1-16 pC N −1 ), T g (160-180 °C) and degradation temperature (315-450 °C) make such polyamides excellent candidates for use as high temperature sensors.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications

Maceiras¹,

Martins²,

Sebastián³

et al. 2014

Smart Mater. Struct.

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“…1. Polyvinlyidine fluoride (PVDF) gauges 22 sandwiched between two teflon films were mounted on the front (Cu baseplate) and rear (quartz window) surfaces of the powder, as shown in Fig. 1(c).…”

Section: Model Applicationmentioning

confidence: 99%

Predicting the shock compression response of heterogeneous powder mixtures

Fredenburg

Thadhani

2013

Journal of Applied Physics

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On the applicability of the P-α and P-λ models to describe the dynamic compaction response of highly heterogeneous powder mixtures J. Appl. Phys. 113, 043507 (2013); 10.1063/1.4788700 High-pressure equation of state properties of bismuth oxide J. Appl. Phys. 110, 063510 (2011); 10.1063/1.3638709 Time-resolved measurements of the shock-compression response of Mo +2 Si elemental powder mixtures J. Appl. Phys. 94, 1575 (2003); 10.1063/1.1586968 Reaction synthesis of shock densified titanium-silicon powder mixtures AIP Conf.A model framework for predicting the dynamic shock-compression response of heterogeneous powder mixtures using readily obtained measurements from quasi-static tests is presented. Lowstrain-rate compression data are first analyzed to determine the region of the bulk response over which particle rearrangement does not contribute to compaction. This region is then fit to determine the densification modulus of the mixture, r D , an newly defined parameter describing the resistance of the mixture to yielding. The measured densification modulus, reflective of the diverse yielding phenomena that occur at the meso-scale, is implemented into a rate-independent formulation of the P-a model, which is combined with an isobaric equation of state to predict the low and high stress dynamic compression response of heterogeneous powder mixtures. The framework is applied to two metal þ metal-oxide (thermite) powder mixtures, and good agreement between the model and experiment is obtained for all mixtures at stresses near and above those required to reach full density. At lower stresses, rate-dependencies of the constituents, and specifically those of the matrix constituent, determine the ability of the model to predict the measured response in the incomplete compaction regime. V C 2013 AIP Publishing LLC.

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“…Because the dynamic compression time of the gun propellant charge is very short and the environment in the gun chamber is very complex, the compression stress sensor is required to have high frequency response, good mechanical properties and large size. Polyvinylidene fluoride (PVDF) is a new type of piezoelectric polymer material with wide frequency response range, wide pressure range (up to 20 GPa) [4,5], high sensitivity [6], good mechanical properties, easy processing and so on, and meets the requirements of dynamic compression stress testing of gun propellant charge. It is widely used in weapon, machinery, construction, medical and other industries [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Temperature compensation of a PVDF stress sensor and its application in the test of gun propellant charge compression stress

Wang

Rui

et al. 2019

Smart Mater. Struct.

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Due to the randomness and transiency of the compressional movement of the gun propellant charge, polyvinylidene fluoride (PVDF) film with easy processing and a high frequency response is used as a test unit of the PVDF stress sensor. The sensor is often used at the same ambient temperature as the gun propellant charge, and its accuracy is susceptible to temperature. The temperature test of the PVDF stress sensor was carried out to obtain the pyroelectric effect and mechanical response in the range of −40 °C to 30 °C. The response time of the pyroelectric effect is much longer than the action time of the compression stress, so the pyroelectric effect can be ignored in the compression stress test. The least squares support vector machine (LS-SVM) method is used to process the test data of the mechanical response in the range of −40 °C to 30 °C, and the LS-SVM model is established to obtain the input force with compensation, which improves the test accuracy of the sensor. A PVDF stress sensor and a dynamic compression device of the gun propellant charge were used to test the compression stress of the gun propellant charge. The compensated compression stress was obtained according to the LS-SVM model established by the temperature test, and the error with the standard sensor test result is small. The new method used in this paper can effectively solve the effect of temperature on the PVDF stress sensor during the compression stress test of the gun propellant charge.

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Piezoelectric Polymer Shock Gauges

Cited by 7 publications

References 10 publications

Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications

Synthesis and characterization of novel piezoelectric nitrile copolyimide films for high temperature sensor applications

Predicting the shock compression response of heterogeneous powder mixtures

Temperature compensation of a PVDF stress sensor and its application in the test of gun propellant charge compression stress

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