Figure 11: Overlay of the Displacement Responses from Predicted Solution Using First Five Modes for Expansion and PONTOS at Five Different Locations; expansion performed using sensor configuration C CASE 2: STRAIN RESPONSE The strain response is obtained from full-field expanded displacements for all the three sensor configurations discussed in Case 1 using strain recovery process outlined in [31]. The strain response has been calibrated for static load and discrete sine test. Ideally for comparing the strain response obtained using the proposed methodology, the reference solution should be obtained experimentally. However, the minimum strain levels measured by using the DIC technique is 50 micro-strain. The maximum strain levels obtained in BU were well below the minimum strain levels that the DIC can measure accurately, even in regions where the highest strain resulted. So for comparison purposes, a FEM of the BU was used which has shown good correlation for previous studies has performed for the purpose of extracting mode shape information. The force pulse used for exciting the BU FEM was one of the impact force measurements made during the impact tests. The force pulse as shown in Figure 12 was discretized at every 0.0001 seconds. As seen in Figure 12, the impact on the BU was made at 0.25 seconds. 212
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