Test system for testing damping performance of high-temperature material

Abstract

The invention provides a test system for testing damping performance of a high-temperature material. The test system adopts a double-layer chamber structure comprising a high temperature vacuum chamber and a normal temperature vacuum chamber, wherein the high temperature vacuum chamber is used for heating a test piece (7); the normal temperature vacuum chamber is positioned below the high temperature vacuum chamber, and the high temperature vacuum chamber and the normal temperature vacuum chamber are communicated through a ring-shaped water cooling jacket (6); a shock exciting mechanism is positioned in the normal temperature vacuum chamber; a heating body (8) and a thermocouple (9) are arranged on an upper thermal insulation layer (13) and are communicated with an electric furnace control cabinet (29); and a data analysis system (24) and a data acquisition system (25) are connected with a displacement sensor (28) and an accelerometer (17) through data cables respectively. Because the double-lug cantilever beam test piece (7) is adopted, the contact damping influence due to direct excitation and the error due to the rotation of a central rigid block of the test piece are avoided, the test temperature of the test piece is changed, the air damping influence is eliminated, and the isolation of an electromagnetic vibration exciter and the high-temperature environment can be effectively realized; moreover, the test system also has the characteristics of simple structure, convenient use, and accurate and reliable test results.

Description

1. Technical field [0001] The invention belongs to the field of material mechanical performance testing, in particular to a testing system for testing the damping performance of high-temperature materials. 2. Background technology [0002] Material damping is one of the key factors that determine the dynamic characteristics of structural systems. Material damping must be considered in structural vibration, noise analysis and noise reduction. However, the internal mechanism of material damping is very complex and is related to many factors, not only the internal structure of the material, but also the strain amplitude, temperature and vibration frequency. Therefore, the accurate test of material damping requires that the test system can meet the conditions of controllable ambient temperature, constant strain amplitude, adjustable test frequency, and small influence of additional system damping (including air damping). For the material damping test in a lower temperature envi...

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Problems solved by technology

[0003] In order to overcome the disadvantages of the prior art that the influence of additional damping is difficult to eliminate, that it is difficult to stably control the temperature of the specimen under high-temperature and high-frequency conditions, and that it cannot maintain a constant large amplitude, the present invention proposes a method for testing the damping performance of high-temperature materials. test system

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