Consideration of stress gauges in the modelling of plate impacts

Church, P.; Townsley, R.; Millett, J. C. F.

doi:10.1063/1.1303654

Cited by 3 publications

(1 citation statement)

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“…The polymer sheets and epoxy form a layer of about 100 µm thickness of low impedance material around the gauge which sits within the surrounding matrix. Any impedance mismatch between gauge package and matrix will compromise the response of the gauge to the stress in the target since the whole low-impedance package must equilibrate with the external field before the gauge senses the matrix stress [10].…”

Section: Introductionmentioning

confidence: 99%

On the shock response of piezoresistive gauges

Bourne¹

2004

Meas. Sci. Technol.

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Recent discussion has highlighted the role of oscillations upon piezoresistive gauge profiles recorded in shock experiments. It has been suggested that mechanical ringing of the pulse is the principal reason for the observed oscillations. However, it has been noted that a gauge mounted close to a metal surface shows some electrical ringing when loaded rapidly by a shock wave. This is explained in terms of two electrical properties: the capacitance introduced between conducting gauge and target separated by an insulating layer and the inductance of the metal coil that is formed in gauge fabrication. It is not expected that such capacitance effects will be observed when a gauge is placed onto an insulator such as a polymer or polycrystalline ceramic. However, some electrical ringing was observed when a gauge was mounted on a polycrystalline ceramic that suggests the form of the mechanical break-up responsible for the threshold termed its Hugoniot elastic limit (HEL). A model is developed to quantify the gauge electrical response to an applied shock pulse. Additionally, the model is used to suggest the manner in which such noise might be reduced in the design of experiment.

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Section: Introductionmentioning

confidence: 99%