Apparatus and testing method for testing sample creep property in ultra high temperature environment

Abstract

The present invention relates to an apparatus for testing sample creep property in an ultra high temperature environment. The apparatus is characterized in that a simply supported bending testing device is arranged between the upper clamping block and the lower clamping block of an electro-hydraulic servo testing machine, and the maximum stress position and the maximum deflection position are not at the same place during a testing process, such that the testing precision is increased at the test design level. According to the apparatus and the mechanical property testing method, characteristics of low sample manufacturing requirements, easy processing and easy operation are provided, and the apparatus and the method can be used for the thermal barrier coating system, can be provided for researching creep properties of various coatings, and provide test technology supports and theoretical guidance for engineering application so as to provide important theoretical research values and wide engineering application prospects.

Description

technical field [0001] The invention belongs to a creep performance testing device and method, in particular to a device and a testing method for testing the creep performance of a sample in an ultra-high temperature environment. Background technique [0002] In recent years, due to the gradual increase in the high temperature resistance and service life requirements of various key parts or components such as the nose cone, wing leading edge, and engine hot end of ultra-high-speed aircraft, a large number of ultra-high-temperature materials based on ceramics (using ambient temperature ≥1000℃) have been applied to a certain extent. In order to achieve the goal of continuously increasing the service temperature of structures and prolonging the economic life of structures, it is necessary to have an accurate understanding of the creep behavior of new materials at service temperatures, so that these materials can be safely used in high-temperature critical parts and structures. ...

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Problems solved by technology

[0004] In summary, traditional standard tests (such as smooth round bar test, compact tensile test) have certain size requirements for the specimen, which are not suitable for thermal barrier coating (TBC) systems, ultra-high temperature ceramic materials (difficulty in machining)

In addition, in the traditional three-point or four-point bending test, first of all, since the maximum bending deflection and damage failure of the sample occur in the middle of the sample, the indentation deformation of the sample will greatly affect the deflection test data. precision

Secondly, due to the friction between the indenter and the test piece and the sliding of the indenter on the test piece, the shear force is generated, resulting in errors in the test results.

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