Peening

About: Peening is a research topic. Over the lifetime, 5538 publications have been published within this topic receiving 73073 citations.

Laser Peening and Shot Peening Effects on Fatigue Life and Surface Roughness of Friction Stir Welded 7075-T7351 Aluminum

Abstract: The effects of laser peening, shot peening, and a combination of both on the fatigue life of Friction Stir Welds (FSW) was investigated. The fatigue samples consisted of dog bone specimens and the loading was applied in a direction perpendicular to the weld direction. Several laser peening conditions with different intensities, durations, and peening order were tested to obtain the optimum peening parameters. The surface roughness resulting from various peening techniques was assessed and characterized. The results indicate a significant increase in fatigue life using laser peening compared to shot peened versus their native welded specimens.

Finite Element Simulation of Shot Peening – A Method to Evaluate the Influence of Peening Parameters on Surface Characteristics

Abstract: Shot peening, known for its potential to improve fatigue strength of metallic parts, can be seen as a multiple and progressively repeated elastic-plastic interaction between the surface and the shots. With each impact the target undergoes local plastic deformation while the shot is moving into the material. After the contact between the target and the shot has ceased, compressive residual stresses remain at the surface and small tensile residual stresses in the inside. Developing a model to analyze the process of shot peening is usefirl for several reasons; to be able to predict the material state after peening without having to conduct costly experiments and to be able to optimize peening processes. In contrast to prior studies found in the literature [I-41, a more detailed approch by simulating several single impacts on a 3-dimensional surface is chosen to model the shot peening process.