Abstract
A compact stress measurement system for transparent objects was proposed based on the combination of photoelascity and DGS methods. The interferometry fringe and speckle image of the deformed specimen were captured from perpendicular and slant directions, respectively. The fundamentals of the stress calculation and imaging model of oblique camera viewing were analyzed mathematically. After phase-shifting computation, image correlation, and geometric transformation, full-field distributions of the major and minor intrinsic principal stresses were obtained simultaneously. A validation experiment was conducted on a circular disk under diametral compression by the proposed method. Comparison between the experimental resulsts and theoretical data calculated according to the theory of elasticity verified the feasibility and accuracy. Moreover, the combined method was also successfully applied for the intrinsic principal stresses determination on transparent wrinkling thin film with defects subjected to shearing forces.
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