PSI - Issue 17

Radek Doubrava et al. / Procedia Structural Integrity 17 (2019) 190–197 Radek Doubrava/ Structural Integrity Procedia 00 (2019) 000 – 000

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The differences between the numerical simulation and the experiment are mainly in the area near the test specimen fixture, which reflects the influence of the material springing back due to the plastic deformation of the test specimen. 4.3. Analyses of displacement measurement during impact The displacement in the centre of the composite test panel was analysed based on the optical sensor data. Figure 7 shows results from the optical sensor measurement of the panel and a comparison with the numerical simulation results.

Fig. 7. Comparison between the experimental and simulated displacement in the centre of the composite test panel

The data from the optical sensor measurement from the composite test panel (Fig. 7) shows that the maximal displacement was outside the sensor range (in this case was up to 17 mm). The results also show the influence of the oilcan effect on the damping, and a negative displacement was observed. The elastic displacement was removed after the test panel was unmounted from the test rig . Figure 8 shows results from the optical sensor measurement of the metal test panel and a comparison with the numerical simulation results.

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Fig. 8 (a) Comparison between experimental and simulated displacement in the centre of metal test panel; (b) secondary impact of remainder of the polystyrene sabot during the impact process (the high-speed camera image was taken at the time 0.008 s)