PSI - Issue 32

O.N. Belova et al. / Procedia Structural Integrity 32 (2021) 32–41 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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experimental data processing, in order to produce theoretically the isochromatic fringe shown in fig. 5 it is necessary to keep twenty terms in the Williams series expansion (1).

Fig. 1. Photograph of the experimental apparatus used to visualize and capturing the fringe patterns.

Fig. 2. Digital images obtained from photoelastic measurement experiments: isochromatic images in the double edge cracked specimen subject to 75 kg, 100 kg, 125 kgand 150 kg.