Cargo compartment floor lower energy absorption structural unit for improving crashworthiness of aircrafts

Abstract

The invention discloses a cargo compartment floor lower energy absorption structural unit for improving the crashworthiness of aircrafts. The cargo compartment floor lower energy absorption structuralunit comprises an upper face plate, a lower face plate, a plurality of composite material thin-walled square tubes and a foam material layer. The cargo compartment floor lower energy absorption structural unit has the advantages that the upper face plate and the lower face plate are made from high-strength aluminum alloy or carbon fiber / epoxy resin composite materials, the composite material thin-walled square tubes which are arranged between the upper face plate and the lower face plate are made from carbon fiber or glass fiber composite materials, accordingly, the cargo compartment floor lower energy absorption structural unit is relatively low in paid weight cost as compared with metal energy absorption structural units with identical volumes, load on the aircrafts can be relieved, andthe economic performance can be improved; each composite material thin-walled square tube crazes along four apex angles in falling and crashing procedures, layer bundles are bent, layered and the like to fail, and most energy can be ultimately absorbed in layer bundle bending failure-mode (open-mode) squashing forms.

Description

technical field [0001] The invention belongs to the technical field of aircraft composite material fuselage structure design, and in particular relates to an energy-absorbing structural unit at the lower part of a cargo compartment floor for improving the crashworthiness of an aircraft. Background technique [0002] The number one requirement for the operation of a civil aircraft is safety. Since the 1990s, although the accident rate of civil transport aircraft has gradually decreased, due to the rapid increase in operating time and number of passengers, the total number of aviation accidents and the number of accidents classified as catastrophic consequences have not decreased significantly. More than 70% of civil aircraft accidents occur in the take-off and landing phases at low flight altitudes, which belong to the category of survivable accidents. In order to improve the survival rate of occupants in survivable crashes, crashworthiness must be considered in the process ...

AI Technical Summary

Problems solved by technology

The metal energy-absorbing structure not only has a low energy loss rate, but also needs to pay a large weight price

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