108 J. I. Ferguson et al. 13.3 Post-buckled Analysis 13.3.1 Experimentation In the post-buckled experiment, the digital image correlation (DIC) technique is used to obtain full-field measurements of the dynamic response of the unidirectional plate specimen. The three-dimensional specimen is reconstructed using the binocular stereovision technique [11]. The two FASTCAM SA5 high-speed cameras (Fig. 13.7a) are positioned with intersecting fields, to capture the full-field dynamic response of the specimen. The cameras trace the speckle pattern (Fig. 13.7b) at a 2000 Hz sampling frequency, with laser vibrometers measuring the out of plane response at a 6000 Hz sampling frequency. Figure 13.8 shows the sampling points for the DIC measurement. The cameras captured 111 sampling points on the plate and 4 sampling points on the fixture in order to obtain the displacement of the plate relative to the motion of the clamp. Fig. 13.7 DIC Experimental Setup. (a) Two laser vibrometers and two FASTCAM SA5 cameras (b) DIC speckle pattern on specimen Fig. 13.8 Superposition of the plate (red line), 111 sampling points on the plate (blue circles), and 4 sampling points on the clamp (green circles) for DIC measurement
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