Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1992-04-27
1994-03-01
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
33DIG13, G01B 716
Patent
active
052897222
ABSTRACT:
A prefabricated, easily installable strain gage assembly (10) is provided which includes an elongated synthetic resin substrate (12) having adhesive (16) applied to the majority of one surface thereof while leaving a handling tab portion (18) adjacent one end of the substrate (12). A strain gage unit (28) is secured to the adhesive-bearing surface of substrate (12). A strippable protective film (56) is placed in covering, protective relationship to the strain gage (28) and the adhesive surface of substrate (12). Preferably, the substrate (12), adhesive (16) and film (56) are substantially transparent, and the substrate (12) is provided with perpendicular alignment marks (55, 55a) which are strategically located relative to the strain gage unit (28). A relatively long hold-down region (42) forming a part of the substrate (12) is provided between the handling tab portion (18) and strain gage unit (28), so that, upon initial visual alignment of the assembly (10) on a test surface ( 60), the film (56) may be partially removed to allow temporary adherence of the region (42) to the surface (62). This insures maintenance of the gage alignment and permits subsequent complete removal of film (56), application of bonding materials (68, 70, 72) to the strain gage unit (28) and surface (62), full lay-out of the substrate (12) on the surface (62), and subsequent substrate removal. Use of assemblies (10) in accordance with the invention drastically reduces strain gage installation times, and greatly minimizes inadvertent destruction of the gages owing to improper placement thereof.
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Instruction Bulletin; Strain Gage Installations with M-Bond 200 Adhesive; No. B-217-10; Measurements Group, Inc. 1979.
Dorgan Robert J.
Walker Hugh S.
Kansas State University Research Foundation
Myracle Jerry W.
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