Simulation of operating loads of ablative composite shields used in flight data recorders
The objects of the mathematical simulation were two covers of the same shape, but different geometrical dimensions. The covers were made of: aramid fabric, alternating and uniformly distributed in the composite - in a polymer matrix of epoxy resin, modified with 15% addition of MMT. For each of the two guards, four variants of the composite material were considered in correlation with the metal casing, as well as three load cases, in accordance with the normative documents. A numerical analysis of dynamic tests was performed to determine the durability of the recorder. As a result of the conducted analyzes, stress values were obtained in all load cases and for all kinds of placement of the composite in correlation with the metal reinforcement casing. The displacements of the entire model and stress σx were analyzed that can cause delamination and stress τyz capable of cutting inter-cutting, as well as a detailed distribution of stresses reduced in subsequent layers of the cover material. The distribution of kinetic and potential energy during piercing of the composite thermo-protective casing was determined by numerical simulation and the housing of recorder made of an epoxy ablation composite, with a metal casing located inside the casing.
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