Accession Number:

ADA626737

Title:

Bolt Shear Force Sensor

Descriptive Note:

Patent application, Filed 12 Mar 2015

Corporate Author:

NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI

Personal Author(s):

• Cavallaro, Paul V.

Report Date:

2015-03-12

Pagination or Media Count:

34.0

Abstract:

A bolt shear force sensor for in-service monitoring is provided in which the sensor includes a deformable ring with channel-like cross-sections and a wire egress hole. The ring surrounds a bolt or fastener to be tested. The channel-like cross sections face exterior to a center of the ring. Strain sensing elements are mounted within the channel cross-sections as an outer circumference of the ring. The sensing elements capture hoop strain from surrounding plates of the operating system which holds the fastener. A signal conditioner operationally connected via wire conductors is used to convert strain sensing signals from the sensing elements to strain output. The strain outputs are then used in conjunction with a calibration curve of shear force versus strain to determine the magnitudes and directions of the resultant shear forces.

Descriptors:

• *BOLTS
• EMBEDDED SYSTEMS
• MONITORS
• PATENT APPLICATIONS
• SHEAR STRESSES
• STRAIN(MECHANICS)
• STRESS STRAIN RELATIONS
• STRUCTURAL INTEGRITY

Subject Categories:

• Couplers, Fasteners and Joints
• Miscellaneous Detection and Detectors
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE