Small-outer-diameter thin-walled tube high-temperature tensile sample and tensile method

Abstract

The invention provides a small-outer-diameter thin-walled tube high-temperature tensile sample which comprises a tensile sample body, and the two ends of the tensile sample body are connected with clamping parts through arc transition structures; the tensile sample body, the arc transition structure and the clamping part are all of plate-shaped structures; the wall thickness of the tensile sample body is consistent with that of the small-outer-diameter thin-walled tube, one end of the arc transition structure is connected with the tensile sample body, the radius curvature center of the joint of the arc transition structure and the tensile sample body is perpendicular to the axial direction of the tensile sample body, the curvature R of the arc transition structure is larger than or equal to 2 mm, and threads are arranged on the outer wall of the clamping part. The small-diameter size of the thread of the clamping part is greater than the width of the tensile sample body; the tensile sample is easy to manufacture and good in stability, the coincidence of the center line of the tensile sample and the force axis of a testing machine is good, and the problem that a small-outer-diameter thin-walled tube cannot be subjected to a high-temperature tensile test is solved.

Description

technical field [0001] The invention relates to the technical field of tensile specimens, in particular to a high-temperature tensile specimen of a small outer diameter thin-walled tube and a tensile method. Background technique [0002] The high temperature tensile test is a tensile test carried out at a high temperature above room temperature. When the high temperature tensile test is carried out, the temperature control requirements are very strict. , to ensure the furnace temperature is uniform, because the space in the furnace is small, so the high-temperature tensile sample needs to use a relatively small tensile sample; the high-temperature tensile sample is based on ensuring the axial loading force and reducing the size of the sample clamping part. In order to facilitate the installation of the extensometer, the clamping part adopts a cylindrical shape and adopts a threaded connection, and the flat shape adopts a pin connection. Connected samples. [0003] Therefor...

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Problems solved by technology

[0002] The high-temperature tensile test is a tensile test performed at a high temperature above room temperature. When performing a high-temperature tensile test, the temperature control requirements are very strict. The samples are generally heated by an electric furnace, and the working space of the furnace must have sufficient soaking heat. , to ensure that the furnace temperature is uniform, because the space in the furnace is small, the high-temperature tensile specimen needs to use a relatively small tensile specimen; the high-temperature tensile specimen is based on ensuring the axial loading force and reducing the size of the clamping part of the specimen. In order to facilitate the installation of the extensometer, the clamping part adopts a cylindrical shape and is connected with a thread, and the flat shape is connected with a pin. For a thin-walled pipe with a small outer diameter and a large curvature and a thin pipe wall, it cannot be processed to meet the standard requirements. connection sample

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