Geometrical instruments – Gauge – Straightness – flatness – or alignment
Patent
1996-04-25
1998-10-20
Gutierrez, Diego F.F.
Geometrical instruments
Gauge
Straightness, flatness, or alignment
33532, 33DIG13, 73105, 73783, G01B 356
Patent
active
058228764
ABSTRACT:
A gauge for measuring an out-of-plane surface displacement profile around a cold-worked fastener hole in relation to the distribution of residual compressive stresses around the hole and related fatigue life. The gauge has a deformable strain sensor positionable to be deformed in accord with the out-of-plane surface of the structural material circumferentially surrounding the cold-worked hole. A measurement reporting readout device is in communication with the strain sensor and relates three-dimensional surface-profile measurement data in accord with strain sensor deformation to determine or verify the cold expansion magnitude, uniformity and consequent fatigue life through three-dimensional elastoplastic finite element comparative analyses and/or experimental measurements for a hole in any material of given thickness.
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Haas Edwin G.
Kennedy James R.
Levy Alvin
Papazian John M.
Anderson Terry J.
Gutierrez Diego F.F.
Hirshfeld Andrew
Hoch Jr. Karl J.
Northrop Grumman Corporation
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