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A Method for Obtaining Stress-Strain Curves of Metal Materials in Static Tensile State
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A technology of stress-strain curves and metal materials, which is applied in the analysis of materials, the application of stable tension/pressure to test the strength of materials, instruments, etc., can solve the problem of long time consumption, inability to obtain material tensile curves, and inability to effectively simulate long-term stress Usage and other issues
Active Publication Date: 2020-11-03
TIANJIN STEEL PIPE MFG CO LTD
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Problems solved by technology
[0003] Before the present invention, metal material carries out tensile test, and test loading rate is generally maintained at 10 -5 the s -1 Above, it is impossible to effectively simulate the use of long-term stress, and the faster the tensile loading rate, the higher the material performance detected, and the greater the gap with the real material performance of the material under long-term stretching.
The relaxation test can measure the real stress of a single point, but it cannot obtain a complete material tensile curve, and the relaxation test takes a long time, and the cost of the test time is relatively high
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Embodiment 1
[0054] like Figure 4 is the true stress-strain curve of the tensile sample at a strain of 1.5%, using the formula σ 真实 = σ 最终 +a*exp(-t / b)+c*exp(-t / d) performs data fitting on the real stress-strain data obtained from the test, and the following results are obtained:
[0057] Fitting curves such as Figure 4 As shown, according to the formula obtained from the fitting solution in the previous step, the time t is brought into infinity, and the obtained
[0058] σ s = σ 最终 =464.76MPa
Embodiment 2
[0060] like Figure 5 is the true stress-strain curve of the tensile sample at a strain of 3.5%, using the formula σ 真实 = σ 最终 +a*exp(-t / b)+c*exp(-t / d) performs data fitting on the real stress-strain data obtained from the test, and the following results are obtained:
[0063] Fitting curves such as Figure 4 As shown, according to the formula obtained from the fitting solution in the previous step, the time t is brought into infinity, and the obtained
[0064] σ s = σ 最终 =552.36MPa
Embodiment 3
[0066] like Image 6 is the true stress-strain curve of the tensile sample at 5.5% strain, using the formula σ 真实 = σ 最终 +a*exp(-t / b)+c*exp(-t / d) performs data fitting on the real stress-strain data obtained from the test, and the following results are obtained:
[0069] Fitting curves such as Figure 4 As shown, according to the formula obtained from the fitting solution in the previous step, the time t is brought into infinity, and the obtained
[0070] σ s = σ 最终 =618.91MPa
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Abstract
The invention provides a method used for obtaining stress-strain curve of metal materials at static tensile states. The method is invented through improvement of tensile experiment and experiment dataprocessing analysis based on strain control or displacement control states, and mainly comprises two steps: firstly, experiment data is obtained through improved tensile experiment, and then the experiment data is adopted in processing of the real stress-strain curve of an obtained material at limit slow tensile, i.e. static tensile states. According to the method, the real stress-strain curve ofa material at long period stretching process is obtained through experiments, so that effective evaluation of material real using performance is realized, and important guiding meaning on the metal material at long term stretching states is achieved.
Description
technical field [0001] The invention relates to the field of performance detection of metal materials, and relates to a method for obtaining real stress-strain curves of metal materials under extreme slow stretching (static stretching) states and different temperature environments. Background technique [0002] Under the long-term tensile load service state of metal materials, especially in high-temperature environments, the structural failure will often be caused due to the reduction of material strength, resulting in huge economic losses. This method can effectively evaluate the performance attenuation of materials in this state . It has important guiding significance for the safe service of materials. [0003] Before the present invention, metal material carries out tensile test, and test loading rate is generally maintained at 10 -5 the s -1 Above, it is impossible to effectively simulate the use of long-term stress, and the faster the tensile loading rate is, the hig...
Claims
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