Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1983-11-03
1985-10-22
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73150A, G01N 308
Patent
active
045480834
ABSTRACT:
A method and apparatus for testing the tensile strength and bonding strength of sprayed-on foam insulation (12) attached to metal cryogenic fuel tanks (14). A circular cutter is used to cut the insulation (12) down to the surface of the metal tank to form plugs of the insulation (12) for testing "in situ" on the tank (14). The apparatus comprises an electro-mechanical pulling device (32) powered by a belt battery pack (34). The pulling device (32) comprises a motor (60) driving a mechanical pulling structure comprising a horizontal shaft (64) connected to two bell cranks (68) which are connected to a central member (74). When the lower end of member (74) is attached to fitting (20), which in turn is bonded to plug (10) (see FIG. 2), a pulling force is exerted on plug (10) sufficient to rupture it. The force necessary to rupture the plug (10) or pull it loose is displayed as a digital read-out (51) on screen (50).
REFERENCES:
patent: 3464261 (1969-09-01), Helms
patent: 3821892 (1974-07-01), Saberg
Ehl James H.
Prasthofer Willibald P.
Schuerer Paul H.
Beumer Joseph H.
Manning John R.
Myracle Jerry W.
The United States of America as represented by the Administrator
Wofford, Jr. Leon D.
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