Anti-adhesive shoulder fixture for improving efficiency of endurance test

Abstract

The invention discloses an anti-adhesive shoulder fixture for improving the efficiency of an endurance test, which aims to provide a novel test fixture structure to improve the efficiency of the endurance test, prevent the adhesion and the tripping between a specimen and a fixture and between the fixture and a pull rod of a testing machine, and ensure the authenticity and the reliability of the test. The technical scheme of the anti-adhesive shoulder fixture has the following key points that: the fixture adopts a shoulder type structure to prevent the adhesion and the tripping between the specimen and the fixture and the adhesion and the tripping between the fixture and the pull rod of the testing machine; a shoulder type serial connector is designed, and two specimens are connected in series and are synchronously tested on one testing machine so as to improve test efficiency; a shoulder large pull head adopts K002 high-temperature alloy, and the shoulder fixture and the shoulder type serial connector adopt directional high-temperature alloy DZ22 or single crystal high-temperature alloy DD3 to improve the applicable test temperature of the fixture to 1200 DEG C; and the fixture has simple operation and quick and convenient clamping, ensures the concentricity, and is applicable to different models of endurance testing machines produced by different testing machine manufacturers.

Description

technical field [0001] The invention is an anti-adhesion shoulder fixture which improves the efficiency of a durable test, and belongs to the technical field of product structure. The fixture can not only improve the efficiency of the metal durable tensile test, but also prevent the sticking and tripping of the fixture and the sample as well as the sticking and tripping of the fixture and the pull rod of the testing machine during the test. Background technique [0002] Endurance tensile test of metallic materials is a test to test the enduring life of materials under constant temperature and constant load. The high-temperature durability test of metal materials is now generally carried out with a standard sample of Φ5. The sample and the fixture are connected by a threaded structure, and the connection strength is not high at high temperature. With the development of material science, the high temperature resistance of materials has been continuously improved, and the test...

AI Technical Summary

Problems solved by technology

The high-temperature durability test of metal materials is now generally carried out with the standard sample of Φ5. The sample and the fixture are connected by a threaded structure, and the connection strength is not high at high temperature.

With the development of material science, the high temperature resistance of materials has been continuously improved, and the test temperature for high temperature endurance tests has also been greatly improved; with the increase of test temperature, more requirements have been put forward for the strength of test fixtures at high temperatures. In the long-term test practice, it is found that when the test temperature of general metal materials exceeds 900°C, the strength of the connecting thread of the sample and the screw buckle of the fixture will be greatly reduced. Durable creep test, due to oxidation ablation and creep relaxation at high temperature, it is easy to cause adhesion or tripping between the connecting thread and the tooling fixture, which affects the progress of the test, and even leads to the scrapping of the test sample and the destruction of the fixture

The general standard configuration of the testing machine is a fixture for testing a single sample, and the testing efficiency of the testing machine is low.

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