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PSN curve measuring method, device and system for welded joint
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A technology for welding joints and measurement methods, which is applied in the field of P_S_N curve measurement for welding joints, can solve the problems of unformed system, cumbersome work, and large amount of data processing, and achieve the effect of enhancing competitiveness and high reliability
Active Publication Date: 2021-12-10
JIANGSU XCMG CONSTR MASCH RES INST LTD
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[0010]
None of the above search results has formed a system, only calculated or fitted by formulas, the amount of data processing is relatively large, and the work is relatively cumbersome
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Embodiment 1
[0066] A method for measuring P_S_N curves for welded joints is provided in the embodiments of the present invention, such as figure 1 As shown, it specifically includes the following steps:
[0067] Step (1), obtaining the number of test stress levels, the number of welded samples under different test stress levels and the fatigue life values of each welded sample under different test stress levels to form raw data;
[0068] Step (2), based on the obtained original data, calculate the logarithmic fatigue life under different test stress levels, the mean and standard deviation of the logarithmic fatigue life, and eliminate unreasonable fatigue life values;
[0069] Step (3), based on the calculated logarithmic fatigue life, mean value and standard deviation of the logarithmic fatigue life, using t distribution to judge whether the sample data of each test level is sufficient;
[0070] Step (4), if the sample data of each test level is sufficient, then based on the input dif...
Embodiment 2
[0105] Based on the same inventive concept as in Embodiment 1, an embodiment of the present invention provides a P_S_N curve measuring device for welded joints, including:
[0106] The obtaining module is used to obtain the number of test stress levels, the number of welded samples under different test stress levels and the fatigue life value of each welded sample under different test stress levels to form raw data;
[0107] The calculation module is used to calculate the logarithmic fatigue life under different test stress levels, the mean value and standard deviation of the logarithmic fatigue life based on the obtained original data, and eliminate unreasonable fatigue life values at the same time;
[0108] A judging module, used to judge whether the sample data of each test level is sufficient based on the calculated logarithmic fatigue life, the mean value and the standard deviation of the logarithmic fatigue life;
[0109] The curve determination module is used to calcu...
Embodiment 3
[0112] Based on the same inventive concept as in Embodiment 1, the embodiment of the present invention provides a P_S_N curve measurement system for welded joints, including a processor and a storage medium;
[0113] The storage medium is used to store instructions;
[0114] The processor is configured to operate according to the instructions to execute the steps of the method according to any one of Embodiment 1.
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Abstract
The invention discloses a PSN curve measuring method and a system for a welded joint. The PSN curve measuring method comprises the steps that the number of test stress grades, the number of welding samples under different test stress grades and fatigue life values of all the welding samples under the different test stress grades are obtained; calculating logarithmic fatigue life under different test stress grades, and a mean value and a standard deviation of the logarithmic fatigue life; based on the calculated logarithmic fatigue life, the mean value of the logarithmic fatigue life and the standard deviation, judging whether the sample data of each test grade is sufficient or not; and drawing a PSN curve based on different input reliability levels. According to the method, the influence of the welding quality grade on the welding fatigue data is considered, the dispersion of the fatigue life of the welding seam is small, different stress types of the welding fatigue sample are calculated by adopting a finite element method, and the P_S_N curve with high survival rate and high confidence is obtained by performing fitting treatment on the SN curve with different reliability grades; Therefore, the method can be directly used for engineering machinery product design and life estimation, and fatigue test workload and cost are reduced.
Description
technical field [0001] The invention belongs to the technical field of fatigue testing of welded structures, and in particular relates to a method, device and system for measuring P_S_N curves for welded joints. Background technique [0002] At present, welding has become the most important connection method in engineering structures, and the weight of welded structures accounts for more than 50% of the total consumption of steel structures. However, fracture accidents of welded structures occur frequently, and 80%-90% of them are fatigue failures. These fatigue failures frequently occur in the welded parts of construction machinery structural parts subjected to dynamic loads, causing huge economic losses. Therefore, it is of great theoretical and practical value to study the fatigue fracture behavior of welded joints. [0003] With the continuous development of fatigue test research and the continuous improvement of structural lightweight requirements, finite life design ...
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