Stress peak detection method through laser shock peening hole wall

Abstract

The invention provides a stress peak detection method through a laser shock peening hole wall. The stress peak detection method comprises the following steps that a finite element model of the laser shock peening hole is established; simulation calculation is performed; a laser loading curve is determined according to the laser shock process parameters; a shock trajectory path is set; a simulation calculation module is started; hole opening finite element simulation is started; laser shock peening simulation is performed on the acting area of laser shock, and then hole opening simulation is performed on the shock center area; the laser shock process parameters are changed and the steps are repeated; a relation curve between the residual stress and the hole wall stress peak of the hole wall surface theory is drawn; the sample is prepared, and laser shock peening processing and hole opening are performed on the sample; the surface residual stress of the hole of the sample is measured for statistical analysis; and the actual residual stress peak of the hole wall is estimated. The surface residual stress near the hole angle can be measured according to the relation curve between the laser shock peening surface residual stress near the hole angle and the hole wall stress peak.

Description

technical field [0001] The invention relates to the field of physical and chemical analysis of material strengthening treatment, in particular to a stress peak detection method for strengthening hole walls with laser shock. Background technique [0002] It is of great significance to adjust the laser shock parameters to achieve the best impact effect on the material according to the material properties and the laser shock intensity effect. However, the strengthening effect of small-hole components is different from the strengthening of ordinary surfaces. The strengthening effect of the material surface cannot be determined; or the strengthening of the material impact surface does not necessarily lead to the strengthening of small-hole components, or it may be because of this Therefore, to study the stress distribution of the hole wall of the small hole component, it is necessary to strengthen the hole wall while impact strengthening the impact surface; but it is difficult to...

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Problems solved by technology

[0007] Although the above online detection methods have effectively solved the problem of characterization of the effect of laser shock strengthening, the strengthening effect of small-hole components cannot be predicted; research has shown that the strengthening effect of small-hole components is closely related to the residual stress distribution of the hole wall, but the small-hole Stress measurements on hole walls are difficult, or impossible to detect

[0008] At present, the method of measuring the residual stress distribution of laser shock strengthening mainly relies on the detection of X-ray residual stress tester. This detection method cannot detect the residual stress distribution in the direction of the hole wall. It is difficult to control the process, which limits the development and application of laser shock peening to a certain extent.

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