Title: Method of preparing a steel cord for the measurement of stress therein

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Abstract: Disclosed is a method and apparatus for measuring stresses in a wire or wire cord, such as that found in the reinforcing belt of a pneumatic tire. A portion of the wire is encapsulated in a solder material which is machined such that a rectangular solid billet of the solder is formed thereon. A transducer or plurality of transducers in the form of strain gauges are fixed to at least one flat surface on the billet and oriented in a direction such that forces applied to the tire will affect the resistance of the transducer. The resistance of the transducer can be balanced in a bridge network and the voltage resulting therefrom suitably readout in terms of the stress being applied to the wire cord. The cord can be built into a tire with the lead wires from the transducer being fed through the tire to the bridge network. The stress tests can then be accomplished in an inflated and running tire.


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