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, the effects of high-frequency ultrasonic peening (HFUP) on the tribological characteristics of Cu-based materials sintered on low carbon steel by a powder metallurgy (P/M) technique were investigated.
29 citations
TL;DR: In this paper, a parametric study was performed based on the supply pressure, standoff distance, traverse rate, and applied air flow rate to identify the key parameters contributing to the material erosion rates and resulting surface roughness parameters.
Abstract: High-pressure waterjets have emerged as a viable method for surface texturing, cleaning, and peening of metallic materials. As the material advancements continue, research into alternate surface processing methods must strive to keep pace. One material in particular that has experienced an increase in use in the biomedical and aerospace industries is titanium—due largely to its high strength to weight ratio and corrosion resistance. In this paper, surface preparation of a titanium alloy using waterjet and the water-air jet nozzles at pressures up to 600 MPa was evaluated. A parametric study was performed based on the supply pressure, standoff distance, traverse rate, and applied air flow rate. An analysis of variance was performed on the resulting experimental set to identify the key parameters contributing to the material erosion rates and resulting surface roughness parameters. The supply pressure was found to be the primary contributor to the erosive characteristics of the waterjet followed by the traverse rate. These parameters together govern the total energy per unit area transferred to the workpiece.
29 citations
TL;DR: In this article, a simple model was proposed to simulate incremental deflections as the shot stream traveled over the samples, and the model parameters were calibrated experimentally and then applied to a different geometry for validation.
29 citations
TL;DR: In this article, a master curve analysis was proposed to predict the fatigue strength of peened butt-welded joints, based on reported measurements and an analytical lower bound result.
Abstract: Experimental fatigue data for butt-welded joints in as-welded condition and under constant amplitude tensile loading were analysed using the effective notch stress system and a new master curve analysis that takes the local stress ratio, Rlocal, into account. The local stresses needed for computation of Rlocal are calculated with the notch strain approach in conjunction with the reference radius concept.
The main focus was to predict with the derived master curve the fatigue strength of peened butt-welded joints. The lowest surface residual stresses after peening were first estimated based on reported measurements and an analytical lower bound result. The predictions showed quite similar strength dependences and FAT values as reported for high-frequency mechanical impact treated welds for applied stress ratio R = 0.1. The benefits of peening reduce faster for higher strength steels when R increases. When R = 0.5, the FATs are practically the same for all steel grades.
29 citations
Patent•
16 Feb 1999TL;DR: In this paper, a target is laser shock peened by directing against an ablative coating thereon a laser beam pulse having a fluence, duration, and corresponding peak power effective for ablating the coating to form a plasma and shock wave therein.
Abstract: A target is laser shock peened by directing against an ablative coating thereon a laser beam pulse having a fluence, duration, and corresponding peak power effective for ablating the coating to form a plasma and shock wave therein. The plasma is confined adjacent the target to plastically deform the target by the shock wave to develop residual compressive stress therein. The pulse has a duration less than ten nanoseconds and a corresponding peak power for increasing coupling efficiency between the pulse and plasma.
29 citations