Method for measuring large-stress range stress strain in uniaxial tensile test of metal round bar sample
A technology of uniaxial tension and measurement method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., which can solve the problems of large error and cumbersome measurement, and achieve the goal of saving measurement time, having operability and saving measurement cost Effect
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[0034] Example one
[0035] (1) The present invention takes a low-carbon steel round bar sample as an example, using figure 1 The round bar sample shown is subjected to a uniaxial tensile test. The initial cross-sectional diameter of the round bar sample is 10mm, and the gauge length is 50mm. Such as figure 2 As shown, an extensometer is used to measure and record the load F from the point of maximum load (necking point) to the point before breaking. i And instantaneous gauge length l i , Formed as image 3 The load-displacement curve shown, using optical measurement method to record the minimum section radius a of the necking at each time i . Among them, i=0~N, 0 and N correspond to the point of maximum load (necking point) and breaking point respectively;
[0036] (2) The metal round rod specimen always spreads and deforms at the minimum necking point after necking instability, and does not participate in the deformation outside the minimum necking point. Such as Figure 4 As s...
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[0050] Example two
[0051] The finite element analysis software ABAQUS was used to simulate the uniaxial tensile process of the round bar specimen. According to the size and conditions of the uniaxial round bar specimen in Example 1, a finite element model of the uniaxial tensile test process was established, and input presets The stress-strain curve is used as the material model. The simulation analysis and the experiment of Example 1 adopt the same constraints and loading conditions, one end is fixed axially, and one end is loaded with the same speed load as the axial direction of the specimen to simulate the tensile process of the specimen. According to the method of obtaining data from the tensile test, take the difference between the two cross-sectional displacements of the gauge length section of the simulation result as the displacement value, and use the resultant force of the interface of the gauge length section obtained by the simulation to draw the relationship curve ...
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