Abstract
In order to investigate the effect of shot distance and impact sequence on the residual stress distribution of 42CrMo steel in shot peening (SP) finite element (FE) simulation, 3D dynamic models with order dimple pattern and stochastic dimple pattern were established via ABAQUS/Explicit 6.14, and the simulation results were compared with experiments. The results show that shot overlap has a significant effect on the residual stress distribution of peened parts. Meanwhile, there is a threshold (related to SP parameter) for shot distance in the vertical and horizontal directions. When the shot distance is greater than the threshold in this direction, the residual stress distribution after SP tends to be stable. The impact sequence has almost no effect on the impact of a small number of shots, but this effect will appear when the number of shots increases. It is necessary to avoid shot overlap and continuous impact of adjacent dimples when the FE model is established; on this basis, the distance between shots and the number of layers of the shots can be reduced as much as possible without affecting the residual stress distribution. In addition, the comparison of simulation and experimental results shows that the residual stress evaluation area consistent with the experimental measurement is essential to obtain accurate residual stress distribution in the FE simulation process.
Highlights
Mechanical processing often introduces tensile stress and micro-cracks on the surface of metal parts, while failures such as fatigue fracture are very sensitive to the surface properties of component materials, so most of the failures occur on the surface of parts [1].As a mechanical surface treatment, the original purpose of shot peening (SP) is to introduce a compressive residual stress field into the surface of the workpiece via a large number of spherical shots impacting metal parts repeatedly, so as to inhibit the initiation and propagation of fatigue cracks and improve the fatigue life
The certain degree of shot overlap is often set in the specific dimple pattern SP model
In order to study the impact of shot overlap on the residual stress field in the ordered dimple pattern SP model, a 4-shots model (100% coverage) was established as shown in Figure 4a, in which the vertical distance Z between shots changes (Z = 0 means shot complete overlap), to describe the degree of overlap in the shot impact process
Summary
Mechanical processing often introduces tensile stress and micro-cracks on the surface of metal parts, while failures such as fatigue fracture are very sensitive to the surface properties of component materials, so most of the failures occur on the surface of parts [1]. Three SP models (including two order dimple pattern models and a stochastic dimple pattern model) were established to study and quantify the effect of shot distance (horizontal direction and vertical direction) and shot impact sequence on the residual stress distribution of peened specimen in an SP model. On this basis, the influence of residual stress assessment area on the residual stress field was further discussed
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