Topic
Peening
About: Peening is a research topic. Over the lifetime, 5538 publications have been published within this topic receiving 73073 citations.
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TL;DR: In this article, 3D laser shock peening (3D LSP) is used to convert tensile residual stresses (TRS) into beneficial compressive residual stresses and their subsequent effect on the geometrical accuracy of produced parts are investigated.
Abstract: One of the major drawbacks of selective laser melting (SLM) is the accumulation of tensile residual stresses (TRS) in the surface and subsurface zones of produced parts which can lead to cracking, delamination, geometrical distortions, and a decrease in fatigue life. 3D laser shock peening (3D LSP) is a novel hybrid method which introduces a repetitive LSP treatment during the manufacturing phase of the SLM process. In this paper, the ability of 3D LSP to convert TRS into beneficial compressive residual stresses and their subsequent effect on the geometrical accuracy of produced parts were investigated. Samples made of Ti6Al4V were manufactured with the 3D LSP process and treated with different processing parameters. Cuboidal samples were used for residual stress measurements, and the evolution of residual stresses was evaluated. Geometrical distortions were measured on bridge-like samples, and the influence on the final sample geometry was quantified. A significant improvement in geometrical accuracy resulting from reduced distortions was observed in all selected 3D LSP processing conditions.
31 citations
TL;DR: In this article, the effect of shot peening is described for a case hardened gear steel for gears there are three main factors that influence fatigue life: residual stresses, microstructure and surface roughness.
Abstract: Shot peening is a manufacturing process commonly used to increase fatigue life in components for the automotive and aircraft industry In this paper the effect of shot peening is described for a case hardened gear steel For gears there are three main factors from shot peening that influence fatigue life: residual stresses, microstructure and surface roughness The paper describes an experimental series where these parameters were measured for common industrial shot peening settings The aim was to show how several different measurement techniques and results correspond to each other for certain shot peening parameters The aim was also to gather experimental results that can be used for verification of shot peening simulations To simplify measurements and decrease variation, flat steel plates were used as targets Residual stress, full width at half maximum (FWHM), retained austenite, surface roughness/topology, hardness and Barkhausen noise were measured and related to microstructural changes The mean indentation diameter was measured for individual shots at low coverage of each intensity which was used to determine the average velocity of the media The mean diameter and hardness of the shot peening media was also determined
31 citations
Patent•
09 May 2003
TL;DR: In this article, a laser shock processing treatment enables a selectively adjustable and customized compressive residual stress distribution profile to be developed within a workpiece by tailoring the size and shape of the laser beam spots.
Abstract: A laser shock processing treatment enables a selectively adjustable and customized compressive residual stress distribution profile to be developed within a workpiece by tailoring the size and shape of the laser beam spots One peening operation applies to the workpiece a first pattern having relatively large laser beam spots and then applies a second pattern having relatively small laser beam spots The composite use of such small and large beam spots enables the stress distribution profile to be tailored to the part specifications The large beam spots maximize the depth of compressive residual stress in the part, while the small beam spots optimize the surface compressive residual stresses of the part The use of small spot beam patterns allows untreated or improperly processed areas to be laser peened
31 citations
TL;DR: In this paper, a technique called elastic contact laser shock peening (ECLSP) is presented, where a metal foil with high dynamic yield strength is fixed between absorbing layer and workpiece, and the peak pressure of laser shock wave is a little less than the dynamic yield of metal foil, but higher than the Hugoniot Elastic Limit (HEL) of work piece.
31 citations
TL;DR: In this article, laser shock peening was performed in direct ablation mode as well as with various sacrificial layers such as black paint, transparent adhesive tape and absorbing adhesive tape.
31 citations