Provided is a failure detection sensor which, when attached to structural members of various structures such as buildings can easily detect the risk of the failure of the structural members, and thus the structure, before such failure occurs and has a simple structure, which leads to realization at a low price. The failure detection sensor comprises: the first member 10 and the second member 20 provided in parallel with the first member 10 such that one end of the second member 20 is fixed to or restricted by the first member 10 and the other end of the second member 20 is not fixed to or restricted by the first member 10, having fracturing characteristics such that the second member 20 fractures during elastic deformation or plastic deformation of the first member 10. The failure detection sensor may have a compression coil spring 40 which applies a tensile force to the other end of the second member 20 on the opposite side of the one end. The first member 10 and the second member 20 are constituted of, for example, a round rod or a square rod and the first member 10 is constituted of, for example, a hollow rod. The second member 20 has a notch 24 which is a stress concentration site between the one end and the other end. The second member 20 is made of brittle materials.

A monitoring method by means of a monitoring system having a first terminal device and a second terminal device is provided. The first terminal device is a control system and the second terminal device is a fastener, e.g., a screw, which fixes together, in use, two or more components of a mechanical apparatus. The second terminal device is provided with one or more sensors and a printed circuit board with a wireless communication portion. The first terminal device and the second terminal device exchange data wirelessly directly and/or indirectly, e.g., via a transport network, such as a telecommunications network.

The present invention provides improved load-indicating devices for use with structural assemblies that require accurate tensioning of fastening components such as nuts and bolts. In one embodiment, the load-indicating device comprises a body portion defining a bore extending therethrough, a movable member disposed in at least part of the body portion and configured to move in a direction substantially orthogonal to the axis of the bore, and an adjustment means coupled to the movable member and operable to displace the movable member when the body portion is compressed.

A foreign material exclusion plug is disclosed. The foreign material plug includes a cylindrical body, a slot, and a breakaway tab. The cylindrical body includes an externally-threaded cylindrical structure. The slot is formed in the cylindrical body extending into the cylindrical body from a top surface of the cylindrical body. The breakaway tab is connected to the cylindrical body and extends outwards from the top surface.

A bolt tension gauging apparatus is provided with a bolt assembly including a bolt having a top cavity on a head and a recess on a surface of a threaded shank, and a covering element fitted onto the recess; an electrical resonant transformer on a bottom of the covering member; and a force transducer and transmitter assembly in the recess and electrically connected to the transformer. An electrical resonant transformation device causes the transformer to harvest power from radio frequency electromagnetic waves if a distance between the transformation device and the transformer is sufficiently short. The force transducer and transmitter assembly gauges tension of the bolt and converts same into a signal. The signal is transmitted to a controller and display device for calculating a difference between a predetermined tension and the gauged tension. An alert is generated if the gauged tension is greater than the predetermined tension.

In a method for extending a threaded bolt by tensioning a threaded end section thereof with a tensioning device, an exchange socket of the tensioning device is screwed onto the threaded end section and a first pin end of a pin slidable in the exchange socket is supported against an end of the threaded end section so that the pin moves in longitudinal direction as the exchange socket is screwed on. A sensor senses a longitudinal position of the pin relative to the exchange socket. An evaluation and control unit compares whether the detected longitudinal position of the pin relative to the exchange socket corresponds to a predefined minimum position value indicating sufficient thread engagement length. When the detected longitudinal position corresponds to the predefined minimum position value, the evaluation and control unit acts on the hydraulic supply to tension the threaded end section of the threaded bolt.

An attraction system includes a first component, a second component, a fastener configured to couple the first component to the second component, a radio frequency identification (RFID) tag including a torque stripe extending between the fastener and a reference point of the attraction system, wherein the RFID tag is configured to emit a radio frequency (RF) signal in response to the torque stripe being unbroken, and an RFID reader configured to detect the RF signal.

A sensorized fastener, in particular a screw, having a shank with a cavity laterally delimited by a lateral surface and extending between an opening, through which the cavity faces the outside of the fastening body, and an end portion. The sensorized fastener has a pin with a support formed by a head, a foot and an intermediate portion, which is interposed between the head and the foot, and a sensing element which is applied to the intermediate portion. The pin is inserted, at least partially, through the opening within the cavity, so that the foot of the pin is fixed to the end portion of the cavity.