Stress Pattern Analysis By Thermal Emission (SPATE)

D. S. Mountain; J. M. B. Webber

doi:10.1117/12.965516

25 July 1979 Stress Pattern Analysis By Thermal Emission (SPATE)

D. S. Mountain, J. M. B. Webber

Proceedings Volume 0164, 4th European Electro-Optics Conf; (1979) https://doi.org/10.1117/12.965516
Event: Fourth European Electro-Optics Conference, 1978, Utrecht, Netherlands

Abstract

This paper describes a novel method of stress determination in structures under dynamic loading conditions. The principle is based on the thermodynamic property of a material in which, under adiabatic conditions, heat is produced or absorbed in direct proportion to the magnitude of the stresses to which it is being subjected. An instrument is described which uses infra-red radiation to measure, remotely, the resulting minute local temperature changes in the material, with oscillating mirrors to provide a raster type scan of the item under test. Spatial resolution down to 1 mm and a temperature discrimination of about 0.002 00 have been achieved, this latter representing a stress change of less than 300 lb/in2 in steel. Results are given which demonstrate the ease with which the equipment can be used to assist in the design of a structure and an indication is given of its potential value in the field of Non-Destructive Testing, for example in the location of fatigue cracks.

Citation Download Citation

D. S. Mountain and J. M. B. Webber "Stress Pattern Analysis By Thermal Emission (SPATE)", Proc. SPIE 0164, 4th European Electro-Optics Conf, (25 July 1979); https://doi.org/10.1117/12.965516

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available