A design method for actively controlling crack propagation path of transparent parts of shell

Abstract

The invention discloses a design method for actively controlling the crack propagation path of a transparent part of a shell, and relates to the field of mechanics. The method includes: prefabricating two initial cracks on a transparent part of a shell; determining the positions of two impact loading points; Two impact loading points, forming an extended crack, determine the length of the extended crack and the area of ​​the fragment; determine whether the length of the extended crack satisfies the first preset condition, and determine whether the area of ​​the fragment satisfies the second preset condition; If not satisfied, execute the steps: Prefabricate two initial cracks on the transparent part of the shell, or perform the step: Determine the location of the two impact loading points. The design method of the present invention realizes active control of the crack propagation path for the transparent shell of the aircraft, so as to ensure that an ejection channel for the pilot to safely eject from the cabin is formed on the transparent shell of the aircraft, which has extremely high practicability.

Description

technical field [0001] The invention relates to the field of mechanics, in particular to a design method for actively controlling a crack propagation path of a transparent part of a shell. Background technique [0002] Guiding and controlling crack propagation is an important method to achieve rapid and reliable separation of structures. A typical application scenario of this method is the aircraft penetrating ejection life-saving system. The cover-piercing ejection life-saving system is to quickly destroy and break the transparent parts of the cockpit shell in the event of an irreversible emergency, so as to ensure that the pilot is ejected out of the cabin. It is the fastest and most efficient emergency exit method. [0003] The cover-penetrating ejection life-saving system not only needs to actively create cracks on the transparent parts of the shell, but more importantly, guide and control the propagation path of the cracks and increase the area of ​​the ejection channel...

AI Technical Summary

Problems solved by technology

However, the research on the fracture of plates and shells has been limited to the status quo dominated by two sets of theories of thin plates and medium-thick plates. It is not universal and is an international problem in the field of mechanics.

For the transparent parts of the aircraft shell, how to actively control the crack propagation path to ensure that the pilot can be safely ejected out of the cabin, there is still a lack of suitable design methods

Images