Abstract
This paper describes an experimental study on stress separation from thermoelasticity and photoelasticity measurements and its application to estimation of stress intensity factor and the J-integral. Thermoelastic stress analysis (TSA) and photoelastic stress analysis (PSA) have been developed as full-field visualization methods of stress distribution. The sum of principal stresses can be measured by TSA, while the difference of principal stresses can be measured by PSA. In this study, the hybrid stress separation measurement technique using both of these methods was applied for determining distribution of stress components in an edge-cracked plate subjected to mechanical load. Stress intensity factor and the J-integral were calculated from the stress distribution. Near-tip exclusive domain J-integral was newly proposed. It was found that these fracture mechanics parameters can be evaluated with good accuracies by the present technique.
