Abstract
The paper presents a promising method of removing undesirable tensile residual stresses in aircraft metal structural elements; the basis of the method is the action of pulsating subsonic gas flows on the surface of these elements. The results of the research showed high effectiveness of controlling residual stresses in aircraft metal structural elements by using pulsating subsonic air flows.
Highlights
The residual stresses, in particular dangerous tensile ones in the surface layers, which appear during manufacturing or corrective maintenance, are reduced by heating
The application of non-deformative methods for controlling residual stresses in aircraft structural elements seems to be having prospects. These methods include the action of pulsating subsonic air flows in whole, and do not have the mentioned above shortcomings
The generation of residual stresses is always connected with heterogeneous plastic deformations in adjacent dimensions of the material or the aggregate, caused by the external deformative action, by temperature gradient along the section of the product during quick cooling, or by the heterogeneity and irregularity of phase transformations, connected with the volume change
Summary
The residual stresses, in particular dangerous tensile ones in the surface layers, which appear during manufacturing or corrective maintenance, are reduced by heating. In the ring samples the values of tangential residual stresses decrease from the surface to the centre, and after going through the neutral layer, they change their sign into the opposite one.
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