Mechanical characteristics of reinforced and three-layer shells based on metamaterials, taking into account operational damageстатья
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Дата последнего поиска статьи во внешних источниках: 4 марта 2022 г.
Аннотация:This article discusses design options for a sealed bulkhead with regulated damage to assess the possibility of using metamaterial from bent aluminum sheets with outer skin in aircraft structures. The analysis of crack growth for conventional and proposed structures is carried out. With the same mass of the two variants of the pressure bulkhead design, in the proposed variant it was possible to provide a significantly higher structure survivability, estimated on the basis of several times lower values of the stress intensity factors at the crack tips, which are significantly lower than the values obtained for the conventional design. Based on the results of the studies carried out, it can be concluded that the elements of aircraft structures obtained using stamping, laser welding and other techniques for creating metamaterials can be effectively used in aircraft construction. The presence of two shells and a periodic structure as a filler at the same time ensures high survivability of such structures.