Correction method of distribution of quenching stress field of aluminum alloy thick plate

Abstract

The invention discloses a correction method of the distribution of a quenching stress field of an aluminum alloy thick plate. In the method, on the combination of X-ray surface stress calibration and finite element modeling and simulation, sample deformation deviation produced by the traditional layer cutting method during a stress test process is obtained, and the traditional computation model is corrected by a layered deformation compensation polynomial fitting function, thus, computation accuracy of the stress field in the layer cutting method is drastically improved, and the result comparison deviation is controlled to be + / -20MPa. The method comprises the steps of: obtaining and correcting a quenching heat transfer boundary condition, analyzing layer cutting deviation and correcting layer cutting computation model mathematically. The method has the advantages that by using the characteristics of multi test methods, the stress is accurately designed in a multi-layer complementary way, and the correction method based on multi test methods is provided; the defect that the traditional single test method has bad accuracy is overcome; and the deformation compensation function is introduced to correct the test deviation, so that higher test accuracy is achieved. The method is reliable, rational in analysis, notable in effect and environmental-protection, and can effectively improve the innerstress computation accuracy of the aluminum alloy thick plate and the like, thereby being suitable for industrialization and scientific research.

Description

technical field [0001] The invention discloses a method for correcting the quenching stress field distribution of an aluminum alloy thick plate, and belongs to the technical field of industrial testing. Background technique [0002] The preparation process of aluminum alloy thick plate will cause large residual stress in the plate, which will affect the subsequent processing and manufacturing. Therefore, it is necessary to test and reduce the stress distribution and strength level of the thick plate. Among them, the test of the internal residual stress of the thick plate has always been a difficult point in the domestic engineering testing technology. So far, there is no mature method to solve it. Benefits play a pivotal role. [0003] At present, among the stress testing methods, there is the X-ray surface stress testing method certified by international standards. Since what is measured by diffraction is the micro-strain in the area, the stress intensity of the area can b...

AI Technical Summary

Problems solved by technology

However, due to some necessary assumptions and overly ideal parameters and boundary conditions in the model, the results of numerical analysis calculations are often quite different from the actual ones, especially in terms of reflecting the inhomogeneity of plastic deformation due to the difference in material properties. Difficult to do, so the calculated results deviate from the actual

The Layer Removal Method (LRM) has advantages in describing the actual internal stress. In theory, its accuracy can be guaranteed by scientific experimental methods, but the experimental method itself has certain limitations, so there are differences between the calculation results and the actual situation, and it also needs to be carried out. Correction and improvement

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