Method for improving precision of reinforced load spectrum by applying CAE technology

Abstract

A method for improving the precision of the reinforced load spectrum by applying the CAE technology comprises the following steps of: 1, editing a road load spectrum to obtain a multi-stage load spectrum L0; 2, establishing a finite element model of the part; 3, performing finite element analysis to obtain a part stress field; 4, the stress field, the material mechanical parameters and the multi-stage load spectrum L0 are imported into fatigue software, and part damage D0 is calculated; 5, replacing the multi-stage load spectrum L0 with the first-stage load spectrum L1, and calculating the part damage D1 again; 6, if D1 is equal to D0, the L1 is equivalent to L0, and the L1 is a first-level reinforced load spectrum; otherwise, the number of cycles is adjusted to obtain a first-stage reinforced load spectrum L2, and the first-stage reinforced load spectrum is applied to bench tests and CAE simulation calculation. The method adopts CAE technology to realize the transformation of the S-Ncurve of the material to the S-N curve of the component, and solves the problem that the slope K value of the S-N curve of the component takes the empirical value and causes the accuracy of the first-order enhanced load spectrum to be poor. Testing the S-N curve of the test parts is prevented, and product development costs are saved.

Description

technical field [0001] The invention belongs to the technical field of load spectrum testing and editing, in particular to a method for improving the accuracy of enhanced load spectrum by applying CAE technology. Background technique [0002] The enhanced load spectrum is mainly used in bench tests and CAE simulation calculations in the product development process. The more series of strengthening load spectrum, the longer the period of test and calculation, and vice versa. Therefore, considering the test and calculation cycle, the fewer the series of the strengthening load spectrum, the better, preferably level 1, which is of great significance for the rapid improvement of the structural scheme. [0003] The load spectrum strengthening mainly uses the slope K of the component stress-life curve. At present, there are two ways to obtain the K value. One is to directly obtain the value based on experience, usually K=5; the other is to make the stress-life curve of the compon...

AI Technical Summary

Problems solved by technology

The first method is mostly used when there are many load series, such as 1000. When the load spectrum series is small, the empirical value K will lead to poor accuracy of the load spectrum, causing the product to be too heavy, and the lightweight design of the product cannot be realized.

Although the second method can be used when the load spectrum is strengthened to level 1, the acquisition of the component stress-life curve consumes a lot of manpower and material resources, and the test period is long, and the obtained K is only applicable to the tested components. For other Parts are not universal, so it is not meaningful to obtain the K value of real parts through experiments

[0004] At present, the main problem encountered in strengthening the load spectrum is that the slope K value of the component S-N curve restricts the accuracy of the multi-level load spectrum to the first-level load spectrum.

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