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In aviation engineering, ensuring the safety and reliability of aviation parts has strict requirements. Compressive residual stresses can improve the corresponding performance by effectively resisting crack initiation and extending the fatigue lives of aviation parts. Shot peening is considered as a suitable processing technology for the introducti...
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Citations
... By inducing residual compressive stresses, plastic deformation of the material occurred and fatigue strength was improved. 6 Kim et al. used a symmetric cytometric finite element model to estimate the actual shot peening residual stresses based on an area-averaged solution, and the analytical model included complex factors that respond to the actual shot peening phenomenon and the plastic shot peening effect. In the plastic shot peening finite element model, the areaaveraged solution is closer to the experimental x-ray diffraction solution than the four-node averaged solution. ...
To study the influence of shot peening residual compressive stress on the fatigue crack propagation behavior of 316L austenitic stainless steel, a three-dimensional finite element model of the compact tensile specimen based on abaqus software and an initial stress simulation model of a shot peening residual stress imported through the re-development of the SIGINI subroutine are established. The fatigue crack propagation behavior under the combined effect of the shot peening residual stress field and external cyclic loading is investigated using the extended finite element method. The results show that the crack propagation path and fatigue life obtained by the finite element method are in good agreement with the experimental results, and the error of the fatigue life is only about 4.05%. When the crack propagates into the shot peening region, the shot peening residual compressive stresses imported on the specimen surface and subsurface enhance the crack closure effect and suppress the crack propagation behavior. The impact of shot peening in the double side peened samples is higher than that in the single side peened samples. For 19 mm crack lengths, double side shot peened specimens presented a 1.2 times increase in fatigue life, compared to single side shot peened specimens (1.1 times).
... The SP method uses high-speed projectile flow (20-150 m/s) to produce elastoplastic deformation of surface material and form a region of a beneficial residual compressive stress field, given that rebounding of the elastic deformation squeezes the plastic region [24]. Especially in recent years, simulations and experimental investigations of surface quality and residual stresses in shot peening were frequently studied [25][26][27][28]. HES uses a certain amount of interference mandrel to squeeze the inner surface of the hole structure to produce controllable radial plastic deformation and introduces hundreds of MPa residual compressive stress to reduce the stress level of the hole edge and improve the fatigue life [29,30]. ...
In this study, the effects of residual stress induced by three different cooling methods during heat treatment on the crack propagation behaviour of the GH4169 disc were investigated. Different levels of stress fields were induced to the specially designed discs by using air cooling (AC), air jetting cooling (AJC) and water quenching (WQ) methods and were quantitated by numerical simulation. These discs were then subjected to prefabricated cracking, and crack propagation tests were conducted on a spin tester with two load spectrums. Crack growth behaviour was depicted via the surface replica technique and fracture morphology. Regarding the linear superposition of residual stress and centrifugal force, the crack propagation behaviour of different discs was simulated using the FRANC3D software. AJC and WQ introduced compressive residual stress (−259 MPa and −109 MPa, respectively) into the disc compared with the AC method (about −1.5 MPa). The AJC method increases the crack propagation life of the disc by introducing residual compressive stress into the area near the surface of the central hole to inhibit the opening of the crack surface. When the fatigue load was low, this inhibition effect was more significant.
Despite the broad study of surface integrity in shot peening, the evolution mechanism of surface morphology considering the initial processing feature is still unclear, which hinders the optimization of peened surface quality. In this study, two typical surfaces (grinding and polishing) were selected to be the initial surface morphology for shot peening. Then the effects of initial surface morphology on peened surface integrity were investigated, including 3D surface morphology, surface roughness, residual stress distribution, and microhardness. It could be found that the processing features of the initial surface still exist but are flattened, even at a relatively high coverage. The shot peening simulation also revealed this flattening effect. Besides, the effect of coverage on surface integrity was investigated. The 12Cr2Ni4A sample with 200% coverage has smaller surface roughness and similar residual stress distribution than 100% coverage, which is different from previous studies on medium-strength steels and lightweight alloys. These results provide a reference for understanding the surface integrity evolution in shot peening.
