High temperature strain test data processing method for plastic materials
A technology of high-temperature strain and processing method, 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 test results containing discontinuities, etc., to achieve accurate parameter estimation Effect
Active Publication Date: 2019-01-15
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 data processing method for high temperature strain test of plastic materials proposed by the present invention will be described below in conjunction with the drawings.
[0066] The high temperature strain test divides the test into two sections by setting the extensometer to remove the control parameters in the test program. The test includes the first section test and the second section test. The first section test can collect effective strain data. After one period of the test, the testing machine stops moving and keeps the current state, and the extensometer is removed. There is no effective strain data for the second test. The extensometer control parameter is a single parameter that characterizes the suspension of the testing machine. During the test, the program When the set sensor response value reaches the control parameter, the first stage of the test ends, the testing machine stops moving, and the test data acquisition system performs multiple sensors in equa...
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The invention discloses a high temperature strain test data processing method for plastic materials. The method mainly comprises the following steps: obtaining the end point of a first stage test andthe start point of a second stage test according to the control parameters of an extensometer during detachment, and then performing interpolation data processing for curve defects caused by the detachment of the extensometer in combination with a threshold; calculating the strain value after the detachment of the extensometer according to the relationship between displacement and strain before the detachment of the extensometer, thereby making the strain data of the test complete; for materials with obvious yield limit and without obvious yield limit, obtaining yield limit based on the intersection of an auxiliary curve and a test curve; and obtaining a constitutive model of the materials based on the data from the point after the transition of the yield limit to the tensile strength. Themethod can realize automatic processing of test data deburring, strain data completion, yield limit calculation and constitutive model parameter fitting by programming, and can effectively improve the data processing efficiency of high temperature strain test of the plastic materials.
Description
Technical field [0001] The invention relates to the field of high-temperature mechanical performance testing, in particular to a method for processing high-temperature strain test data 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 domestic and foreign units are committed to the research and development of new plastic materials processing techniques. In order to understand the influence of new processing technology on mechanical properties, material tests are needed. High temperature strain test is one of the basic mechanical tests for high temperature 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 strain testing. The high-temperature extenso...
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CPCG01N3/18
Inventor 陈茉莉汤剑飞施则高
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS