Browse Prior Art Database

Minute Drag Force Transducer

IP.com Disclosure Number: IPCOM000037868D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-30
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Alcoe, DJ: AUTHOR [+2]

Abstract

Disclosed is a device for use in the measurement of minute drag forces induced on thin discreet overflow wiring of a printed circuit board subjected to cooling air flow. The device is used to estimate fatigue life of associated solder joints.

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Minute Drag Force Transducer

Disclosed is a device for use in the measurement of minute drag forces induced on thin discreet overflow wiring of a printed circuit board subjected to cooling air flow. The device is used to estimate fatigue life of associated solder joints.

The accompanying figure of the transducer shows all major components. Two diametrically opposed pairs of semiconductor strain gages mounted at the base of the transducer post, along with associated bridge and signal conditioning equipment, provide an engineering estimate of the average total drag force on the subject wire.

Due to the small magnitude of the drag force involved, it is necessary to employ both the semiconductor strain gages for their high degree of sensitivity, and the transducer shroud. The shroud prevents a drag force from developing on the transducer post which would overwhelm the force of interest generated on the wire. The transducer is immersed in the air flow only to the point indicated on the shroud by the dashed line.

Disclosed anonymously.

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