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The presence of cracks in any structure or structural component may result in the total failur of the structure. The stress intensity factor (SIF) provide a single parameter representation for the stress condition at the crack tip. This paper desoripes a new evaluation method of the isochromatic fringe pattern for the determination of mixed mode stress intensity factor. The method bypasses the error-prone measurements on the isochromatic pattern near to the crack tip and uses data from the near of the crack tip as well as extended stress field. The four parameter method of determining the opening mode stress itensity factor (KI), developed by the authors [1) was extended to incorporate the more general case of an arbitrarily oriented crack problem, wher the stress field is governed by two mixed mode factors KIand KII The method presented here is easy and the use of the full-field data permits a significant improvement in the accuracy of determining the mixed mode stress intensity factors. Experimental evidence corroborated the results obtained by the new mehtod. INTRODUCTION By employing fracture mechanics concepts it is possible to characterize the stress singularity at the crack tip by means of stress intensity factors Kland KII. These stress intensity factors are associated with a opening mode ICI and shearing mode KII. Most of the photoelastic studies deal with mode-I stress intensity factor, and except for a few isolated studies and little attention has been paid to mixed mode stress intensity factors ICI and KII, Cheng (2) in a brief note determined the mode-I and mode-II SIFs by making photoelastic measurements on sixteen points near the crack tip. Based on the idea of Irwin, an approach was developed by Smith and Smith (3) for determination of mixed mode KIand KII, Gdoutos and Theocaris (4) have developed a method for the determination of mixed mode stress intensity fact_ors and extrapolation laws were given for transfeering the far from crack * Lecturer, Dept. of Design and Production Engg., Faculty of Engineering Mansoura University, EGYPT. ** Professor, Dept. of Aeronautical Engg. T.T. T., Bombay, INDIA. *** Assistant Prof. Dept. of Mechanical Engg., T.T.T., Bombay, INDIA. MDB-201216 I CONFERENCE

A NEW METHOD OF DETERMINING THE MIXED-MODE STRESS INTENSITY FACTORS FROM ISCCHROMkTIC FRINGE LOOPS