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Repair method for interfacial delamination defect of filament wound engine casing

A technology for engine casings and delamination defects, which is used in climate sustainability, sustainable transportation, air transportation, etc., can solve problems affecting the strength of composite layers, casing shape and position tolerances, etc., and achieve the effect of improving quality reliability.

Active Publication Date: 2022-08-09
湖北三江航天江北机械工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the same resin is used to repair the composite layer, the secondary heating will affect the strength of the composite layer and even the shape and position tolerance of the shell

Method used

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  • Repair method for interfacial delamination defect of filament wound engine casing
  • Repair method for interfacial delamination defect of filament wound engine casing
  • Repair method for interfacial delamination defect of filament wound engine casing

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Embodiment Construction

[0087] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0088] The repair method for interfacial delamination defect of filament wound engine casing is especially suitable for debonding repair of the position where the thermal insulation layer is more than 10mm. The delamination defect repair of interface includes defect identification, defect removal, composite layer reset, cold bonding repair and hot bonding repair. Specific steps are as follows:

[0089] 1) First ultrasonic inspection and then DR inspection to accurately locate the position of the interface delamination defect, and draw the defect edge identification line on the surface of the thermal insulation layer

[0090] In order to accurately define the defect position, during the ultrasonic inspection process, the defects of plastic mold cloth are pasted on the edge of the interface delamination defect, which is used as a referenc...

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Abstract

The invention discloses a method for repairing interfacial delamination defects of filament wound engine casings. A defect edge identification line is drawn on the surface of a heat insulating layer—the heat insulating layer at the defect position is removed, and the interface delamination defect position is exposed—the composite layer is reset—cold-bonded Repair-Hot-adhesive repair, by first cold-bonding and repairing a layer of thermal insulation layer (EPDM or other thermal insulation material) vulcanized film on the surface of the composite layer, the temperature isolation between the shell composite layer and the hot-adhesive repair insulation layer is performed to reduce the The influence of vulcanization temperature on the strength and deformation of the shell composite layer; then through the hot-adhesive repair process, the defect position formed by the thermal insulation layer after the debonding and removal of the thermal insulation layer is repaired for a second time, so that the reliability of the repair quality of the thermal insulation layer is greatly improved; the use of low temperature The cured resin glue is used to reset and repair the defects between the interface layers. On the premise of completing the interface repair of the composite layer, the influence of heating on the strength of the shell and the size and shape tolerances is reduced.

Description

technical field [0001] The invention belongs to the technical field of fabricating filament winding engine casings, and particularly relates to a method for repairing delamination defects at the interface of filament winding engine casings. Background technique [0002] The filament wound engine casing is mainly composed of two parts: a thermal insulation layer and a composite layer. The composite layer generally uses carbon fiber (or aramid fiber, etc.) to strengthen the epoxy resin material system, and adopts spiral and hoop winding, which mainly carries the propellant during the working process of the engine. High internal pressure capability from combustion. [0003] As the thermal insulation structure between the combustion chamber and the shell, the thermal insulation layer is mainly responsible for the sealing of the filament winding engine shell, and through carbonization, decomposition, sublimation, etc., to cut off the high temperature of the high temperature gas f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C73/10B29C73/24B29C73/26
CPCB29C73/10B29C73/245B29C73/26B29C73/24B29C2073/262B29C2073/266Y02T50/60
Inventor 谭云水张宇姚桂平高李帅吕银辉李忠仕
Owner 湖北三江航天江北机械工程有限公司
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