PSI - Issue 38

Isabel Huther et al. / Procedia Structural Integrity 38 (2022) 466–476 Author name / Structural Integrity Procedia 00 (2021) 000 – 000

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3. Measurement description 3.1. Gage instrumentations Four welded specimens are instrumented with six uniaxial strain gages as presented in Figure 2(a): • side C1D1: gages at the weld toe (J1) and at 8 mm (J2), • side A2B2: gages at the weld toe (J5) and at 8 mm (J6), • side C2D2: gage at 0.4 t = 3.2 mm (J3) and at 8 mm (J4).

a

b Figure 2 Specimens with (a) strain gages and (b) speckle pattern.

3.2. Digital Image Correlation

Digital Image Correlation (DIC) has been used on all instrumented samples. The speckle pattern is applied near the weld toe A1B1 as shown on Figure 2b. To analyse the DIC measures, virtual gages are considered J5b and J6b at the same location of the J5 and J6 gages, i.e. at the weld toe for J5b and at 8 mm for J6b. 3.3. Residual stress measurements Residual stress measurements were performed before and after overload on the surface by X-rays method with a circular impact spot of 2 mm diameter following the EN 15305-2009 standard [3]. The location of the measurements is shown on Figure 3. The transversal and longitudinal stresses were measured.

Face A CD2 Face B CD2

Face A AB1 Face B AB2

Longitudinal direction

Face A CD2

Face A AB1

Transversal direction

Figure 3 Location of residual stress measurements