A clamp-type high-temperature extensometer with adjustable spacing

Abstract

The invention discloses a spacing adjustable clamping type high temperature extensometer. The extensometer comprises a sensing part and an extension rod. One end of the extension rod is connected withthe sensing part, and the other end of the extension rod is fixedly connected with a locating frame, the locating frame is connected with a clamping device, the clamping device comprises inner and outer stitches, one end of the inner stitch is fixedly connected with the locating frame, the other end of the inner stitch serves as a clamping end A, one end of the outer stitch is in sliding cooperation with the locating frame, the other end of the outer stitch extends into the outer side of the clamping end A of the inner stitch to form a bending clamping end B, a compression spring is clamped between the outer stitch and the locating frame, and a heat shield is arranged in the ends, close to the locating frame, of the inner and outer stitches. The extensometer can realize self-balance of clamping, is especially suitable for measuring deflection of a plate in the high temperature environment, and has the advantages of being light, wear-resistant and convenient to operate.

Description

technical field [0001] The invention belongs to the field of deformation measurement, and mainly relates to a clip-type extensometer with adjustable spacing for high temperature measurement. Background technique [0002] Ceramic matrix composites are increasingly used in aviation and aerospace fields, and the measurement of their mechanical properties at high temperatures is essential for their structural design and strength and life prediction, and the testing is difficult. The extensometer is an important tool for measuring deformation in mechanical performance testing. At present, most of the extensometers commonly used are axial resistance extensometers, such as: used for tensile, torsion, and combined tension and torsion extensometers, and are mostly used at room temperature. With the change of test requirements, room temperature extensometers are easy Achieving technical versatility, but it is not easy to meet the requirements of high-temperature testing. In order to ...

AI Technical Summary

Problems solved by technology

However, this method of fixing the test piece has the disadvantage that during the loading process of the test piece, if the test piece is a round rod, it is easy to cause relative sliding between the ceramic rod and the test piece; if the test piece is a plate, then Flexible wires are prone to wear on the edges of the panels and require periodic inspection and replacement

When used for small-sized test pieces or plates with relatively small thickness, the test piece is bent due to the external load of contact force during use, so it is not particularly suitable for test pieces with small structural dimensions

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