Abstract
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.
Highlights
Good protective properties in buffering of fire and thermal shock can be obtained using composite polymer coverings with typical ablative composite matrices like silicone resin (Yuan et al, 2018), phenol resins (Kucharczyk et al, 2013; Pulci et al, 2010; Bahramian, 2013; Zhou et al, 2019) or epoxy resins (Kucharczyk, 2010; Bakar et al, 2016; Camino et al, 2005; Kucharczyk et al, 2018; Krzyżak et al, 2018; Stawarz et al, 2019) with fillers that increase the thermal stability of a composite
Analysis of energy changes allows you to observe the reflection of the weight from the material of the spherical cap in 23 400 modeled load cycles for a composite shell (Fig. 11) and 33 650 modeled load cycles for the flight recorder cover made of a polymeric ablative composite with a metal casing placed inside (Fig. 12)
There is an analogic observation in the case of shear stresses in the xz plane for a composite shell (Fig. 16) and for the housing of a recorder made of a polymeric ablative composite with a metal layer placed inside the cover
Summary
The term ablation refers to the exchange of heat and mass in the body's upper layer in thermochemical and mechanical processes. The recorders of operation parameters of various operational objects are increasingly used by car manufacturers (ADAC, 2015; GM, 2016; IEEE 1616, 2004), locomotives, ships, and even architecture, in order to assist all emergency services involved in removing the consequences, and determining the causes of the existing communication (building) disasters It is a measurement and diagnostic module SDM (Sensing and Diagnostics Module), from which information is read and archive during technical inspections. Test of resistance to static load involves checking the strength of the protective housing subjected to a force of 22.25 kN for 5 minutes, along specific directions for a given shape Their implementation requires the design and execution of a measurement station and the production of a series of covers that will be subjected to strength tests. The ANSYS 15.0 software was used for numerical analysis of dynamic loads of guards
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
