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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a626737.pdf


Report Date : 12 Mar 2015


Pagination or Media Count : 34


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