PSI - Issue 24

Alessandro Castriota et al. / Procedia Structural Integrity 24 (2019) 279–288 A. Castriota et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 2. Constrains and load of the numerical model

The critical buckling load was evaluated by performing a linear instability analysis using the load P and calculating the relative eigenvalues of the mathematical problem. Finally, multiplying the first eigenvalue for the applied load P the buckling load was obtained in the two cases considered.

4. Experimental set-up and method

The validity of the numerical model and the actual structural behavior of the damaged panel were determined carrying out load tests on a real scale. The panel was suitably equipped with uniaxial strain gauges, strain gauge rosettes and strain gauge strips (Fig. 3) to detect the global deformation field of the stringer and of the most stressed zones of the skin. The displacement of the section subjected to the load measured with two symmetrical LVDT sensors.

(a)

(b)

Fig. 3. Detail of uniaxial strain gauges, strain gauge rosettes and strain gauge strips mounted on the panel: (a) side A; (b) side B