Manufacturing tool for [phi]25 mm tearing test piece

Abstract

The invention discloses a manufacturing tool for a [phi]25 mm tearing test piece; an inner mold is placed in a shell, and an inner cavity of the shell is divided into a plurality of forming cavities through the inner mold. A top cover is placed on the upper end face of the shell, and the two ends of a positioning rod on the lower surface of the top cover are attached to the inner surfaces of the two sides of the shell so that the top cover can be positioned. Forming holes in the inner mold and the guide holes in the top cover are in one-to-one correspondence and are concentric. A pressure applying rod is arranged in each guide hole in the top cover. A vacuum bag sleeves the outer surface of the manufacturing tool. The method solves the problems of local dislocation and uncontrollable pressing pressure intensity of a test piece, is simple to operate, low in coaxiality of the tearing test piece and controllable in pressing pressure, improves the manufacturing quality of the tearing testpiece, has the bonding strength of 5.88 MPa and the ratio of the maximum and minimum difference values to the mean value of 0.08, and is stable in quality of the test piece; and the bonding performance of a shell and a heat insulation layer of a solid rocket engine can be expressed more accurately.

Description

technical field [0001] The invention relates to the field of testing the interface bonding strength of a combustion chamber of a solid rocket motor, in particular to a manufacturing tool for a φ25mm tear-off test piece. [0002] technical background [0003] The φ25mm tear-off test piece is a rod-shaped test piece bonded by adhesive between the T-joint and the circular insulation layer. During the tear-off strength test, the load acts on the bonding surface of the test piece vertically along the axis, and the tensile force is applied at a specified speed. , the tear-off strength of the interface can be obtained until the specimen is broken. Such as figure 1 As shown, it mainly includes a T-shaped joint (1) and a circular heat-insulating layer (2). The T-shaped joint (1) is a steel component, and the circular heat-insulating layer (2) is made of rubber material. The two are connected by an adhesive (3) . The tear-off strength of the φ25mm tear-off test piece is an indirect ...

AI Technical Summary

Problems solved by technology

The quantitative pressurization method of the rectangular tear-off test piece is not suitable for the φ25mm tear-off test piece. During the curing process, the overflow will reduce the thickness of the heat insulation layer, resulting in a smaller torque applied by the torque wrench.

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