Hollow round bar specimen inner wall temperature measuring method
A technology of hollow round bar and temperature measurement, which is applied in thermometers, measuring devices, and heat measurement, etc., can solve the problems of small inner diameter of hollow round bar test pieces, difficulty in guaranteeing welding quality, and high difficulty, so as to improve the accuracy of experiments and reduce processing costs. Inexpensive, the effect of ensuring welding quality
Active Publication Date: 2015-12-16
BEIHANG UNIV
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Problems solved by technology
[0004] Hollow round bar specimens usually have a small inner diameter and a long length. If you try to directly weld the thermocouple to the inner wall of the narrow and long test piece, it is very difficult, and the welding quality is difficult to guarantee, which directly affects the feasibility and quality of temperature measurement. measurement accuracy
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[0022] like figure 1 As shown, the hollow round rod specimen 1 for the test has a shape similar to a "dog bone" shape, the clamping ends 2 at both ends are thicker, the middle assessment section 3 is thinner, and the total length of the specimen is L. Use a lathe to machine out bosses 4 with a height of T at the clamping end 2 of the hollow round bar specimen 1 for the test. After the machining is completed, figure 2 As shown, so far the processing of the hollow round bar specimen 1 for the test is completed. Make spring sheet 5 such as image 3 , one end of spring leaf 5 to image 3 The length of the middle crease line is the length L of the test piece, and there are small buckles 6 with a length t at both ends of the spring leaf 5, and t is required to be less than the height T of the boss 4 of the hollow round bar test piece 1 for testing. After the spring sheet is processed, the temperature measuring thermocouple 7 is welded on the top of the arc surface in the middle ...
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Provided is a hollow round bar specimen inner wall temperature measuring method, comprising the steps of: (1) processing bosses used for fixing a spring leaf at grip ends of a hollow round bar specimen; (2) manufacturing a spring leaf of a corresponding length according to the size of the hollow round bar specimen, wherein the central section of the spring leaf is provided with an arc surface; (3) welding a temperature thermocouple on the top of the arc surface; and (4) inserting the spring leaf with the thermocouple into the hollow round bar specimen, and fixing two ends of the spring leaf to the bosses at the grip ends of a hollow round bar specimen, thereby allowing the thermocouple to be in close contact with the inner wall of the hollow round bar specimen, and realizing the temperature measurement of the specimen inner wall.
Description
technical field [0001] The invention relates to a method for measuring the temperature of the inner wall of a hollow round bar test piece, which belongs to the field of fatigue tests of superalloy materials used in aero-engines. Background technique [0002] The main failure mode of aeroengine turbine blades is thermomechanical fatigue. At present, the research on the thermomechanical fatigue behavior of turbine blades is generally carried out through the thermomechanical fatigue test of standard specimens of its materials. Existing studies have shown that the hollow round bar specimen has obvious advantages over the common "dog bone" shaped round bar specimen, so it is considered by ISO, the European Union, the United States, and domestic standard-setting organizations to be the most suitable form of specimen. Although the hollow rod specimen has the advantages of less material, faster heating / cooling speed, and more uniform lateral temperature of the specimen compared wit...
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Inventor 王荣桥蒋康河胡殿印申秀丽樊江
Owner BEIHANG UNIV