Contact thermal resistance test method applied to GH4169/GH4169 high temperature alloy

Abstract

The invention discloses a contact thermal resistance test method applied to a GH4169 / GH4169 high temperature alloy, comprising the following steps of: modeling through the reduced elastic moduli of two contact materials according to the plastic deformation theory, simplifying a model, and finally determining unknown parameters through a stepwise regression test to obtain an optimal regression equation. The contact thermal conductance of the GH4169 / GH4169 high temperature alloy is obtained according to a regression analysis result, and the reciprocal of the contact thermal conductance is fetched to obtain contact thermal resistance. Within the temperature interval of 100-600 DEG C, when a temperature value and a pressure value are selected as independent variables, hs is equal to 0.1566T0.371P2.061, and when only the pressure value is selected as the independent variable, hs is equal to 0.5013P2.18. In the invention, the practical engineering contact thermal resistance test method is obtained on the base of test data through selecting a proper theoretical model by applying a mathematical statistics method. Only by obtaining the required parameters through the test data, the invention can obtain the contact thermal resistance according to a simple formula under any condition of changing the test temperature and pressure, and thereby the contact thermal resistance test process is simple and can be repeatedly used.

Description

technical field [0001] The invention belongs to the technical field of thermal contact resistance testing of superalloys, and in particular relates to a thermal contact resistance testing method applied to GH4169 / GH4169 superalloys. Background technique [0002] Many models, empirical and semi-empirical relations for predicting contact conductance have been proposed in the past few decades. The classic models include the Mikic elastic model, the CMY (Cooper, Mikic and Yovanovich) plastic model, and the elastic-plastic deformation model by Sridar and Yovanovich. The theoretical research in China is mainly reflected in the numerical simulation of contact thermal resistance. [0003] In the prior art, the contact thermal resistance test of two high-temperature materials is carried out through a large number of tests. The test process is to select the interface material and process it into a sample with a certain size and a certain interface roughness, and then pressurize and h...

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Problems solved by technology

[0004] Although the existing test technology can accurately obtain the contact heat conduction under the conditions of given temperature, pressure and interface roughness, due to the complexity of the test process and relatively fixed test conditions, it cannot meet the changing temperature and pressure conditions in engineering applications. Unable to provide timely and accurate contact thermal conductivity data at the material interface

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