Open AccessSimulation of operating loads of ablative composite shields used in flight data recorders
Author(s) -
Paweł Przybyłek,
Tadeusz Opara,
Wojciech Kucharczyk,
W. Żurowski,
Agata Pietras
Publication year - 2022
Publication title -
reports in mechanical engineering
Language(s) - English
Resource type - Journals
ISSN - 2683-5894
DOI - 10.31181/rme20014032022p
Subject(s) - casing , materials science , delamination (geology) , composite number , epoxy , composite material , aramid , stress (linguistics) , curling , structural engineering , engineering , fiber , mechanical engineering , geology , paleontology , linguistics , philosophy , subduction , tectonics
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 analyses, 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 as a possible cause of delamination, while the shear stress τyz is a possible cause of inter-cutting. Also, a detailed distribution of stresses reduced in subsequent layers of the cover material was analyzed. The distribution of kinetic and potential energy during piercing of the composite thermo-protective casing was determined by numerical simulation and the design of the recorder housing made of an epoxy ablation composite, with a metal casing located inside the casing, was considered.