Design And Experimental Research Of High Temperature Biaxial Tensile Testing Equipment

Materials are the material basis and the forerunner of social development.With the development of aerospace and military industries,the application demand for heatresistant composite materials is increasing.The development and research tasks of various heat-resistant composite materials in my country are increasing rapidly,and the performance of materials is increasing rapidly.The testing field also presents new challenges.Heat-resistant composite materials in aerospace and other fields are usually used in high temperature/complex load environments.The high temperature load and complex stress experienced during service are the direct causes of their damage and failure,which seriously affect their service life and reliability.Traditional test methods only consider normal temperature,uniaxial or biaxial loading,and cannot accurately test the mechanical properties of materials under actual service conditions.In view of the current high temperature testing of dual-axis equipment at home and abroad,there are problems such as low loading temperature and the inability to achieve in-situ observation.The developed equipment can apply tension/compression(tension-tension,tension-compression,compression-compression)combined stress mode to the material under test through the biaxial loading module,and apply high-temperature temperature load based on the high-temperature loading module to realize force-heat Coupling loading test,carried out the mechanical performance test requirements of the heatresistant composite material under the actual service environment.(1)The complex load loading module of the high-temperature dual-axis test equipment was developed,and the key problem of neutral detection and adjustment of the dual-axis loading system was solved at the same time.Aiming at the centering problem of the loading chain,a multi-centering sensor suitable for the biaxial loading system is proposed to detect the coaxiality of the loading chain,and the fuzzy neural centering adjustment algorithm is established to obtain the mapping relationship between the strain and displacement of the whole field.Through the multi-axis alignment adjustment device,the coaxiality adjustment of the loading chain is realized,and the alignment adjustment method of the dual-axis loading system is proposed.(2)The high-temperature loading module of the high-temperature biaxial tensile testing equipment proposes a biaxial and bilateral simultaneous loading scheme;the high-temperature loading scheme is simulated by finite element method,and the hightemperature loading system is simulated according to the simulation results and the specific requirements of the in-situ test module.The structural size was optimized.Based on the simulation results,the whole machine structure size design,processing,and whole machine debugging were carried out,and the 1700℃ heating test verification was completed.(3)The key components of the whole machine are calibrated,four measurement methods are adopted,and the adjustment scheme from coarse to fine is adopted to realize the centering calibration of the dual-axis loading system.Research on the mechanical properties of heat-resistant composite materials under extreme working conditions has been carried out,and the metal biaxial tensile test at room temperature has been completed.The test results are consistent with the simulation results,which verify the reliability of the test equipment and provide basic conditions for the hightemperature biaxial loading test;the CC composite material optimized sample was subjected to the high-temperature biaxial equal-scale tensile test test at 1700℃ to obtain the heat-resistant composite material Force-thermal coupling load test data.This paper takes the heat-resistant composite material as the test object,carries out the research of in-situ testing under high temperature/complex load,builds the high-temperature biaxial in-situ test equipment to realize the high-temperature biaxial in-situ test,through the combination of theoretical analysis and experimental verification,It provides experimental support for the equipment design and development of aerospace and other industries,and also promotes the continuous development of heat-resistant composite material preparation technology,and enhances my country’s international competitiveness in the field of heat-resistant composite material testing.