Repair method for inter-layer delamination of fiber-wound shell of solid-propellant rocket engine

Abstract

The invention discloses a repair method for inter-layer delamination of fiber-wound shell of a solid-propellant rocket engine. The repair method comprises the steps that a defective area and the depthare determined; the position of an opening of an insulating layer is determined according to the defective area; an opening is formed in the insulating layer located in the defective area; whether the two openings communicated with the defective area is checked, glue is injected into the defective area for repair, and rolling is conducted in the glue injection process to ensure that the defectivearea is full of the glue; after glue injection is completed, a suction pipe is dismantled, a vacuum bag is manufactured in a whole repair area for vacuumizing, and the repair area is pressurized through a supporting tool; and solidification is conducted, the supporting tool is removed, and pits in the insulating layer are repaired. Glue injection is used for repair, so that damage to the surfaceof the insulating layer is minimized; the repair method can also be used for repairing defects on the interface of a composite layer, and the problem that the shell is scrapped and cannot be used dueto defects on the inner surface of the shell is solved; and operation is easy, the operation risk is low, the requirements for the skill level of workers is low, and the defect repair rate reaches 100%.

Description

Technical field[0001]The invention belongs to the technical field of composite material repair, and in particular relates to a method for repairing the layering of solid rocket motor filament winding shells.Background technique[0002]With the rise of composite materials, composite materials with higher specific strength and specific stiffness are gradually replacing traditional steel, aluminum alloys and titanium alloys, which are clearly manifested in the application of fiber-wound composite engine housings. The thermal insulation layer is a protective layer placed between the propellant and the engine casing. Its main function is to protect the engine casing from the erosion of high-temperature gas when the propellant burns, so that the engine can work normally. In addition, it can also play a buffering role for the free-filling charge, reducing the collision between the free-filling charge and the shell, and buffering the stress transmission. The production of large-scale filament...

AI Technical Summary

Problems solved by technology

Because the two methods need to dig out the heat insulation layer, there are certain risks in operation, and they have a certain impact on the reliability of the heat insulation layer itself. In addition, local heating is required during the heat repair process, and the strength of the composite layer will also be weakened due to heat.

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