Therefore, the region where the horizontal displacement derivative value fluctuates with 0 as the fluctuation baseline is defined as the intact zone (IZ).At the post-peak 80%, the horizontal displacement derivative value gradually increases at 14.6–22.5 mm with the curve away from the 0-fluctuation baseline, and the horizontal displacement also shows an increasing trend in Fig. 6 .
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Experimental study on crack propagation pattern and fracture process zone evolution based on far-field displacement by using DIC.
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