A processing method for high temperature strain data of plastic materials
A technology of high temperature strain and treatment method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of insufficient measurement range, incomplete strain test data, and discontinuous points in test results, and achieve accurate parameter estimation. Effect
Active Publication Date: 2021-02-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0009] Purpose of the invention: The present invention provides a data processing method for high-temperature strain tests of plastic materials to solve the problem of incomplete strain test data and test results caused by insufficient high-temperature strain extensometer range of ceramic or quartz cutter heads during high-temperature tests of large-deformation plastic materials. The problem of data processing with discontinuities, and the problem of parameter estimation of the constitutive model of large plastic deformation materials are solved at the same time
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[0065] The method for processing the data of the plastic material high-temperature strain test proposed by the present invention will be described below in conjunction with the accompanying drawings.
[0066] The high-temperature strain test is divided into two sections by setting the extensometer unloading control parameters in the test program. The test includes the first section of the test and the second section of the test. The first section of the test can collect effective strain data, and the second section of the test After a period of testing, the testing machine stops moving and maintains the current state, and the extensometer is removed. There is no valid strain data for the second period of testing. The control parameter of the extensometer is a single parameter that represents the suspension of the testing machine. When the set sensor response value reaches the control parameter, the first section of the test ends, the testing machine suspends the movement, and t...
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The invention discloses a data processing method for high-temperature strain tests of plastic materials. The main steps are to obtain the end point of the first section of the test and the start point of the second section of the test according to the control parameters when the extensometer is removed, and then combine the threshold value Interpolation data processing is performed on the curve flaws caused by meter removal. According to the relationship between the displacement and the strain before the extensometer is unloaded, the strain value after the extensometer is unloaded is calculated to complete the strain data of the test. For materials with and without obvious yield limit, the yield limit is obtained based on the intersection of the auxiliary curve and the test curve. The constitutive model of the material is obtained based on the data between the point after the completion of the yield limit transition and the tensile strength. The invention can realize automatic processing of test data deburring, strain data integrity, yield limit calculation and constitutive model parameter fitting through programming, and can effectively improve the processing efficiency of high-temperature strain test data of plastic materials.
Description
technical field [0001] The invention relates to the field of high-temperature mechanical performance testing, in particular to a data processing method for high-temperature strain testing of plastic materials. Background technique [0002] Plastic materials will not break even if there is a large deformation, and have good impact resistance. They are widely used in aero-engine casings, nuclear power pipelines and other fields. Many units at home and abroad are committed to the research and development of new processing technologies for plastic materials. In order to understand the influence of the new processing technology on the mechanical properties, material tests are required, and the high temperature strain test is one of the basic mechanical tests for high temperature resistant plastic materials. [0003] In the high-temperature strain test of plastic materials, commonly used sensors include displacement sensors, force sensors and high-temperature extensometers for mea...
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IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 陈茉莉汤剑飞施则高
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS