Appraisal Of A New Infrared-Based Stress Analysis Technique

A new and versatile experimental stress analysis technique has recently been developed, based on the measurement of the infrared radiation emitted from the surface of a body as a result of temperature changes caused by cyclic loading within the elastic range ( i.e., the thermoelastic effect). The theory is outlined and the apparatus [referred to as the SPATE (stress pattern analysis by thermal emission) equipment] is described. A number of applications are described to illustrate the principal characteristics of the technique, which is now regarded as a valuable new approach in the stress analysis and design assessment of a wide range of engineering components and structures. Possible future developments in this area are outlined.