Bolt clamping force sensor and clamping force validation method

Details Bolt clamping force sensor and clamping force validation method Bolt clamping force sensor and clamping force validation method

1991-07-16

1993-05-18

Noland, Tom

Measuring and testing

Dynamometers

Responsive to force

73761, 7386201, 364508, G01L 500

Patent

active

052110613

ABSTRACT:
A method to accurately determine and assure proper clamping force or bolt tension in fastening systems comprises statistically sampling washer or flanged bolt lots for clamping force versus deflection relationships, encoding the lots and subsequently installing the fasteners to the prescribed deflections of the lots. A validator and validation method is disclosed that provides the statistical sampling and a corresponding sensor device is disclosed for measuring the deflection as the fastener is installed. Thus, the deflection of the washer or bolt flange as the fastener is installed determines the clamping force applied by the fastener and assures that the proper clamping force has been obtained. The new method and sensor are applicable to special flanged bolt and standard bolt-Belleville washer combinations. No modification of the bolts or washers is required.

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