performed at any step of the process. Note that to make the displacement field apparent, unrealistic parameters were used as input while generating Fig. 43.2. Figure 43.3 shows one of the most critical parameters of the set we analyzed: three simulated sets of images, respectively corresponding to a mono-axial stress state (σx ¼100 MPa), a hydrostatic state (σx ¼σy ¼100 MPa) and a pure shear (τxy ¼100 MPa), were generated using a mildly orthotropic material (E1 ¼93,700 MPa, E2 ¼7450MPa, G12 ¼3976MPa, Fig. 43.2 A synthetic image generated using our in-house developed speckle generator. Each speckle corresponds to a known, bell-shaped, function. The displacement field is described using (43.4), thus no interpolation is performed at any stage of the generation process. Note that unrealistic material parameters were used to emphasize the applied load 88 90 92 94 96 98 100 102 104 106 108 110 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 74960 79645 84330 89015 93700 98385 103070 107755 112440 target value: 100 MPa [MPa] normalized E1 E1 [MPa] σx (monoaxial) σx (hydrostatic) σy (hydrostatic) τxy (shear) Fig. 43.3 Influence of E1. The most affected stress state corresponds (as expected) to a mono-axial loading parallel to the first material axis. Note the small deviation from linearity at large errors 43 Sensitivity Analysis of i-DIC Approach for Residual Stress Measurement in Orthotropic Materials 359
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