High-temperature tensile-fatigue mechanical property tester and method based on electric cylinder drive

Abstract

The invention relates to a high-temperature tensile-fatigue mechanical property tester and method based on electric cylinder drive and belongs to the field of mechanical property testing. The high-temperature tensile-fatigue mechanical property tester and method based on electric cylinder drive comprises a mobile platform, a high-temperature module and a test module, the test module is directly driven by an electric cylinder; the intermediate transmission links are few to achieve tensile and fatigue single load and tensile fatigue composite loading. The high-temperature module adopts a double-cavity high-temperature heating furnace, and the clamping specific unit of the test module can be driven by the movable platform after reaching the specified temperature by the double-cavity high-temperature heating furnace and enters the heating cavity to perform relevant mechanical property tests so as to meet the test requirements of the specific materials. The high-temperature tensile-fatiguemechanical property tester had the advantages that the structure is simple, the transmission link is small, the measuring precision is high, and effectively solves the problem of the influence of thethermal deformation on the mechanical property test during the temperature loading process and provides. a new method to reveal the mechanical properties of materials under the coupling of temperaturefield and composite load and has great practical significance to guide future resource exploration, aerospace and so on.

Description

technical field [0001] The invention relates to the field of precision scientific instruments in the field of testing the microscopic mechanical properties of materials, in particular to an electric cylinder-driven high-temperature tensile-fatigue mechanical property testing instrument and method. The instrument can study the failure mechanism of materials subjected to tensile-fatigue loads under high temperature conditions, and provides a new method for revealing the mechanical properties and microstructure evolution behavior of materials under the coupled action of temperature field and composite load. Background technique [0002] Materials are the foundation of the national economy and the support and guide of high-tech. Improving the level of material performance testing is the key to ensuring product performance and service life. When materials and their products are subjected to alternating loads, although the load amplitude is much lower than their yield strength or...

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Problems solved by technology

[0004] Existing high-temperature tensile-fatigue mechanical performance testing instruments generally have complex structures and many intermediate transmission links, such as the high-temperature in-situ tensile-fatigue testing system and its testing method (CN104913981A) designed by Liu Yang et al. in 2015; The loading force of the high-temperature fatigue device is small and the heating environment is air. For example, the high-temperature fatigue performance test device and method of micro-components under composite stress (CN104677746A) designed and developed by Ma Zhichao et al. in 2015; the disadvantages of this design are: (1) There are many intermediate transmission links It leads to large errors in the deformation measurement of the specimen; (2) heating in the air will cause serious oxidation of the specimen; (3) the small loading force prevents the fatigue test of the specimen in the plastic area, and the use is limited

In addition, the fixture part of most existing high-temperature mechanical property testing instruments heats up simultaneously with the heating chamber, and the thermal deformation of the fixture will affect the test results

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