Device for accurate measurement of micro deformation of composite rod for space

Abstract

The invention provides a device for accurate measurement of micro deformation of a composite rod for space, and relates to the field of aerospace. The device solves the problems that an existing measuring method is low in measurement accuracy and cannot be used for effectively measuring micro deformation of a composite rod for space. The device comprises a steel ball made of 16-level-accurcy stainless steel materials and a straight joint made of invar steel materials with the linear expansion coefficient being zero; the two ends of the straight joint are of a first cylindrical structure and a second cylindrical structure respectively, the middle of the straight joint is of a square structure, the end of the first cylindrical structure is provided with a spherical groove for fixing the steel ball, and the spherical groove is the same as the steel ball in diameter; the diameter of the second cylindrical structure is in clearance fit with the inner diameter of the composite material rod, and the composite material rod is installed on the second cylindrical structure in a sleeved mode and connected together with the second cylindrical structure in a cementing mode. When the device is used for measuring the micro deformation of the composite rod, the repeatability is within 0.5 micrometer, and the measuring accuracy is high.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a device for accurately measuring the tiny deformation of a composite material bar used in space. Background technique [0002] Space cameras are one of the most important payloads for the detection and exploration of space science. They have been developing in the direction of long focal lengths, large apertures, and large curvature radii, which makes the size of cameras larger and larger. At the same time, space cameras There are high requirements for the stability of the optical system, which brings great difficulties to the structural design and material selection of the space camera. In order to reduce the quality of the camera while ensuring the stability of the camera, the long focal length space camera is often designed with a truss structure. Due to the advantages of high specific stiffness and nearly zero thermal expansion coefficient of carbon fiber composite materi...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of low measurement accuracy and inability to effectively measure the small deformation of composite material rods in the existing measurement methods for qualitatively explaining the deformation of different types of composite material rods through the determination of the linear expansion coefficient of composite material unidirectional plates , the present invention provides a device for accurately measuring the small deformation of composite material rods used in space

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