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Strain Gauge Deflection Guard

IP.com Disclosure Number: IPCOM000103445D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 37K

Publishing Venue

IBM

Related People

Harpham, MJ: AUTHOR

Abstract

Figure 1 is a cross section of a strain gauge 1, rigidly supported on one end 2 and free to flex on the other end 3.

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Strain Gauge Deflection Guard

      Figure 1 is a cross section of a strain gauge 1, rigidly
supported on one end 2 and free to flex on the other end 3.

      When a load is applied in the direction indicated by the arrow
4, the gauge will deflect according to well-known beam equations.
Since the strain gauge is a sensitive device, it may not withstand
extreme loads.  Extreme loads will deflect the gauge beyond its
elastic limit and degrade its performance.  To control the amount of
deflection and, thus, safe stress levels for the strain gauge
material, two deflection guards 5 are applied.  The guards stop any
deflection motion which might permanently damage the device.

      The success of the deflection guard is dependent on the
dimension 6.  This dimension is defined by using the stress value at
the elastic limit of the strain gauge material and applying it to the
applicable beam equation.

      Disclosed anonymously.