Device for measuring test hole compression deformation

A technology of extrusion deformation and measuring holes, which is applied in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems of large measurement error, low installation efficiency, and adhesive failure, etc. Ergonomic, reduced measurement error, high accuracy

Active Publication Date: 2016-07-06
CHINA AIRPLANT STRENGTH RES INST
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AI Technical Summary

Problems solved by technology

The disadvantages of the existing extensometer connection method include: 1. It is necessary to glue four supports and use two extensometers to eliminate the influence of the out-of-plane rotation of the test piece on the measurement; 2. When the thickness of the test piece is different, it is necessary to Adjust the support; 3. Adhesive is used in the installation process, and the surface of the test piece and the extensometer support need to be treated. The installation efficiency is low and it is not environmentally friendly; 4. In high temperature environments, the adhesive fails, so it cannot 5. The span between the two extensometer supports is large, and the hole deformation displayed by the extensometer includes the deformation of the test piece between this large span, and the measurement error is large

Method used

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  • Device for measuring test hole compression deformation
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  • Device for measuring test hole compression deformation

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Embodiment Construction

[0022] Such as figure 2 As shown, the hole squeeze deformation measurement system includes a test piece 1, an extensometer 2, two identical asymmetric extensometer knife edges 3, and two extensometer fixing devices 4. Since it is necessary to measure the relative deformation of the two overlapping laminates to determine the extrusion deformation of the hole, and the sides of the two overlapping laminates are coplanar and not coaxial, the present invention designs an asymmetric extensometer knife edge . figure 2 Three views of the knife edge of the asymmetric extensometer, where the axis in the front view coincides with the center line of the extensometer arm. When the knife edge is used to measure the deformation of the mechanical connection test hole, the axis is also coplanar with the lap surface of the test piece. The asymmetric extensometer is actually obtained by cutting the blade of the symmetrical extensometer blade in half along the midline, and then continuing to grin...

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Abstract

The invention belongs to the test technology of material performance test, in particular to a device for measuring the extrusion deformation of a mechanical connection test hole. The design of the connection part of the composite material structure is the key to the design of the aircraft structure, and the extrusion design value of the mechanical connection is based on the extrusion allowable value of the typical laminated single-nail-single-shear connection specimen. This is because the aircraft composite structure A single-lap mechanical connection is commonly used. The object of the present invention is to provide a device for measuring the extrusion deformation of a mechanical connection test hole. Compared with the existing measuring device, the device is easy to use, has high measurement accuracy, is safe and environmentally friendly, and can improve work efficiency.

Description

Technical field [0001] The invention belongs to the test technology of material performance testing, and specifically relates to a device for measuring the extrusion deformation of a mechanical connection test hole, which is convenient to use and has high measurement accuracy. Compared with the existing adhesive extensometer support method, it is greatly simplified The operation process is reduced, the measurement error is reduced, at the same time, it is safe and environmentally friendly, and improves work efficiency. Background technique [0002] The design of the connection part of the composite material structure is the key to the aircraft structure design, and the mechanical connection extrusion design value is based on the extrusion allowable value of the typical ply single nail-single shear connection sample. This is because the aircraft composite material structure The mechanical connection form of single overlap is generally used. At present, ASTMD5961 standard is widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/32G01N3/14
Inventor 程鹏飞李磊乔永乐黄光启
Owner CHINA AIRPLANT STRENGTH RES INST
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