A prediction method for crack growth in structural parts based on multi-factor fusion correction
A technology of crack propagation and prediction method, applied in the field of crack propagation prediction of structural parts, can solve the problems of low prediction accuracy and too few factors to be considered, and achieve the effect of accurate and effective prediction and improvement of prediction result accuracy
Active Publication Date: 2017-11-10
南京市特种设备安全监督检验研究院 +1
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Problems solved by technology
There are many studies on the prediction of component crack growth information, but most of them focus on improving the accuracy of crack growth prediction results through the correction of a single factor, so as to realize the accurate evaluation of component operating status and remaining life, so too few factors are considered and many cannot be realized. The low prediction accuracy caused by simultaneous correction under factor conditions is a common problem in this research field at present.
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[0024] see figure 1 and figure 2 As shown, the present invention discloses a crack propagation prediction method for structural parts based on multi-factor fusion correction.
[0025] The method includes the following steps:
[0026] S1. Determination of the morphology characteristics of the initial crack of the component
[0027] Scan the crack area of the structural part by means of reverse calculation, and determine the crack morphology characteristics such as the initial crack length of the component according to the scanned data;
[0028] S2. Calculation of stress intensity at the root of component crack
[0029] Establish the 3D model of the analysis component according to the drawings, and correct the 3D model according to the crack region morphology reconstruction characteristic data obtained after S1 scanning and processing, and import the established 3D corrected model into the finite element software, and divide it into meshes , constraint setting, and load a...
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The invention discloses a method for predicting the crack propagation of structural parts based on multi-factor fusion correction. Many factors that affect the crack propagation of structural parts are taken into consideration, including the initial crack morphology of structural parts, the stress intensity at the crack root of structural parts, the measurement and correction of residual stress, the calculation of stress ratio, the calculation of size correction parameters, the surface manufacturing The selection of processing quality correction parameters, etc., greatly improves the accuracy of prediction results, thereby realizing accurate and effective prediction of crack growth in structural parts.
Description
technical field [0001] The invention belongs to the field of mechanical detection, in particular to a method for predicting the crack growth of structural parts. Background technique [0002] With the progress of society, a large number of equipment are developing in the direction of large-scale. Under such a background, a small crack damage will cause a huge fracture loss, so it is necessary and urgent to predict the crack growth of equipment or components to grasp its growth law. There are many prediction theories for crack growth, but the accuracy of prediction results based solely on these theories is often poor. The main reason is that there are many external factors that will affect the prediction results. There are many factors that affect the crack growth of structural parts, usually including: structural factors, stress ratio, average stress, load type, manufacturing and processing factors, etc. There are many studies on the prediction of component crack growth in...
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IPC IPC(8): G06F17/50
Inventor 丁树庆贾民平朱林冯月贵胡静波许飞云胡建中王会方黄鹏庆光蔚
Owner 南京市特种设备安全监督检验研究院