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Diagnostic Study of the Possibility of Damaged Sewn Sandwiches to Undergo a New Impact


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DOI: https://doi.org/10.15866/irece.v14i4.21955

Abstract


Over the past decades, sandwich structures have shown impressive performances in impact resistance and damage tolerance, which has allowed their innovations in various disciplines to flourish. The birth of sewn sandwiches has given, on the one hand, elements with structural cores that participate in the resistance to transverse shearing and, on the other hand, sandwich skins that contribute to resisting forces from the same direction to achieve an assembly, giving the structure an optimal lightness. After evaluating the behavior of said structure against impact stresses, in this study, it is proposed to start by evaluating the effect of damage caused by impacts of different energies. Then, their influence on the structure's mechanical properties and its ability to undergo one or more new impacts will be checked. For this, by using a microscope, diagnostic tests have been carried out for each sample after the first impact, followed by characterization by non-destructive tests based on vibration analysis in order to examine and compare the properties of a healthy plaque with those of the affected plaques. The tests are carried out on samples of dimensions 150 × 200 × (1.5 + 20 + 1.5 = 23) mm3. The results obtained by using the specialized software PULSE have encouraged a second series of effects on these samples.
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Keywords


Damage Tolerance; Diagnostic; Impact Resistance; Mechanical Properties; Non-Destructive Tests; Sewn Sandwiches; Vibration Analysis

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References


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