Process and device for determining the mass fraction of one cons

Details Process and device for determining the mass fraction of one cons Process and device for determining the mass fraction of one cons

1997-03-06

1998-08-25

Do, Diep N.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324677, 324701, 324704, 324711, G01R 2702, G01N 2702

Patent

active

057986509

ABSTRACT:
A process for controlling the weldability of a sheet (1) of the composite metal sheet type having a layer (7) which is interposed between two metal facing sheets (3,5) and comprises a polymer (8) having a filler of conductive particles (9). This process comprises measuring by means of a signal of given frequency f applied to two electrodes (11,13) disposed in facing relation to each other, each electrode being in contact with a corresponding metal facing sheet (3,5), the voltage/current phaseshift .phi. due to the resistive and capacitive properties of the composite sheet (1). The response of the composite sheet (1) to this signal corresponds to that of an equivalent parallel RC circuit. Thereafter, the mass fraction of the conductive particles (9) is calculated from the value of .phi.. By comparing the determined mass fraction with prefixed thresholds, the weldability and the vibration-damping capacity of the composite sheet (1) are evaluated.

REFERENCES:
patent: 2528342 (1950-10-01), Cuckler
patent: 3355664 (1967-11-01), Panke
patent: 3535631 (1970-10-01), Geest et al.
patent: 4968947 (1990-11-01), Thorn
patent: 5212982 (1993-05-01), Macchiarulo et al.
patent: 5508622 (1996-04-01), Gatzlaff

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