Abstract: A device and method for indicating if a fastening element upon fastening to a piece has reached a tensile yield limit load. The fastening element includes a threaded shaft having a magnetostrictive material. The device includes a mechanism for generating an alternating magnetic field that penetrates the shaft, a mechanism for measuring a physical quantity that depends on the momentary magnetic susceptibility of the shaft and a control unit adapted to detect a significant change of the physical quantity and determine and indicate if the shaft of the fastening element has reached the tensile yield limit load.
Type:
Grant
Filed:
June 8, 2011
Date of Patent:
December 16, 2014
Assignee:
Rocan System AB
Inventors:
Rolf Carlsson, Christer Johansson, Fredrik Ahrentorp, Christian Jonasson, Jakob Blomgren
Abstract: A device and method for indicating if a fastening element upon fastening to a piece has reached a tensile yield limit load. The fastening element includes a threaded shaft having a magnetostrictive material. The device includes a mechanism for generating an alternating magnetic field that penetrates the shaft, a mechanism for measuring a physical quantity that depends on the momentary magnetic susceptibility of the shaft and a control unit adapted to detect a significant change of the physical quantity and determine and indicate if the shaft of the fastening element has reached the tensile yield limit load.
Type:
Application
Filed:
June 8, 2011
Publication date:
March 28, 2013
Applicant:
ROCAN SYSTEM AB
Inventors:
Rolf Carlsson, Christer Johansson, Fredrik Ahrentorp, Christian Jonasson, Jakob Blomgren
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