Apparatus and method for indicating stress in an object
AssigneeSira Institute Limited
InventorsDavid S. Mountain, Anthony J. Allnutt, Lionel R. Baker, Laurence J. Cox, Alan J. Picot, Peter F. Wardropper, Julian M. Webber
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Abstract
Apparatus and method for indicating stress in an object comprising viewing the temperature variation of part of the surface of the object as it is stressed. An infra-red detector detects small changes of temperature and the stress may be applied by natural loading or by cyclic stressing imposed by a vibrator.
Claims37
A method for indicating and distinguishing tension and compression in a predetermined part of a complex shaped object comprising determining a continuously changing load on the object and measuring and distinguishing increases and decreases in temperature of the predetermined part of the object with change of load, said measuring of the temperature being performed by determining the thermal radiation of the predetermined part and correlating these changes of temperature with respect to the instantaneous value of the continuously changing load.
Apparatus for indicating and distinguishing tension and compression in a predetermined part of a complex shaped object comprising means for determining a continuously changing load on the object, thermal radiation determining means for measuring and distinguishing increases and decreases in temperature of the predetermined part of the object with change of the load applied to the object and signal processing means for receiving a signal from said measuring and distinguishing means and from said load determining means to correlate these signals to produce an output indicating and distinguishing tension and compression at said part.
Dependencies are inferred from the claim text.