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Showing 1 to 18 of 18 for “"Shot peening"”.
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Numerical analysis of compressive residual stresses in metallic materials as a result of shot peening
… and practical implementation has shown that shot peening considerably increases the fatigue life of a component by introducing compressive residual stresses within the surface layers of the component. This has created a need to develop a numerical model that accurately predicts such residual …
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Control de los parámetros de shot peening con objeto de optimizar estos tratamientos sobre materiales industriales
… se aplica de la manera más eficiente posible, el shot peening, un tratamiento superficial en frío, que se basa en hacer impactar a gran velocidad bolas esféricas de pequeño tamaño (0,3<Ø<1,6 mm) contra la superficie del material a tratar, induciendo una serie de fenómenos que, correctamente …
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The effect of laser shock peening and shot peening on the fatigue performance of aluminium alloy 7075
… of components, through various means including shot peening and laser shock peening, can result in local residual compressive stresses which provide a resistance to both crack initiation and propagation, thus leading to an increase in the fatigue life of the components. The effects of both laser …
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An Evaluation of Ultrasonic Shot Peening and Abrasive Flow Machining As Surface Finishing Processes for Selective Laser Melted 316L
… abrasive flow machining and ultrasonic shot peening, are evaluated as surface finishing processes for selective laser melted 316L. Results of these experiments indicate that AFM can reliably polish as-built internal passages to 1 µm Ra or better but is unsuitable for passages with …
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Mejora del comportamiento a fatiga del acero AISI 4340 mediante la combinación de tratamientos superficiales
Los tratamientos de shot peening simples que mejor comportamiento a fatiga han conferido al acero AISI 4340 templado y revenido a 200ºC, fueron los realizados con bolas de acero con una intensidad Almen de 14A. Con los tratamientos de mayor intensidad, como 19A, se logra obtener un perfil de …
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RESIDUAL STRESSES IN GROUND AND IN PEENED SURFACE
… grinding, and compares it to that generated by shot peening. Residual stress determination was carried out using Sachs'method. This method consists of removing layer of material from the surface of tubular specimens . After each layer is removed, the change in strain is measured using a strain …
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Theoretical analysis and experimental investigation of contact fatigue and surface damage in prealloyed and diffusion bonded sintered steels
… strengthening treatments: carburizing and shot peening on prealloyed (homogenous microstructure) and carburizing, sinterhardening and through hardening on diffusion bonded (heterogeneous microstructure) steels. The theoretical resistance to subsurface and surface crack nucleation in …
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Dry sliding and contact fatigue behavior of different high density Ni-Cu-Mo PM Steels
… different mean Hertzian pressures. Effect of shot peening on contact fatigue behavior was also investigated. Two different types of shot peening, ceramic or steel+ceramic, were considered. Stress and strength calculations were made based on the local approach on contact fatigue, which was …
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The impact of continuous improvement methods on a firm's competitive priorities: empirical evidence from the customers perspective in the aerospace industry
… Processors) , and Surface Enhancement (aka Shot Peening). Analysis of the survey data was conducted with a Structured Equation Model (SEM), specifically using the Partial Least Squares Path Modeling (PLS-PM) technique to determine the nature and intensity of the relationships among the …
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The Role of Twinning in the Plastic Deformation of Alpha Phase Titanium
… likely to cause deformation twinning: metallic shot peening, laser shock peening and deep cold rolling. The results presented in this thesis have furthered the understanding of the role of deformation twinning in the plastic deformation of α-phase titanium. Key findings of the research include …
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An investigation of the surface finishing action and resulting surfaces produced by the Cascade Finishing process
… vibratory motion were found to have undergone a peening action with surfaces having initial roughnesses of 6.7[mu]m Ra being smoothed to 1.5[mu]m under the proper operating conditions. Many profile tracings and micro-photographs of the surfaces produced by the process are included in this paper. …
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A unified fracture mechanics approach to fretting fatigue crack growth
… results on the same material after shot peening are reported and used to evaluate the ability of the approach to cope with residual stresses. A good qualitative explanation of the fretting fatigue resistance of the shot peened material is demonstrated. These experiments also serve to …
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The Effect of Newer Methods of Processing on the Fatigue Strength of Cast Steel
… reduction in fatigue strength. However, light shot peening of the surface increased the fatigue strength to a level higher than that of the base metal.
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Ανάπτυξη αριθμητικού προτύπου για την προσομοίωση της σφυρηλάτησης με βολή σωματιδίων
Η σφυρηλάτηση με βολή σωματιδίων (shot peening) είναι μία επιφανειακή κατεργασία που πραγματοποιείται με σκοπό την αύξηση της αντοχής μεταλλικών υλικών και εφαρμόζεται στο τελευταίο στάδιο της γραμμής παραγωγής. Η αύξηση της αντοχής επιτυγχάνεται με την ανάπτυξη θλιπτικών παραμενουσών τάσεων κοντά …
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A Study of the Effects of Laser Shock Peening on Residual Stress, Microstructure and Local Properties of IN718 Ni-Base Superalloy
<p>In this project effects of Laser shock peening (LSP) on two aero engine alloys, IN718 and IN718 SPF were studied. The primary goal of the program was to secure required fundamental knowledge of e impact of LSP process parameters on these two aero engine alloys and thereby advance the science and …
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The effect of drawing strain on the fatigue behaviour of stainless and carbon steel wires
… despite of its high notch sensitivity. Both shot peening of the steel wire surface and reducing the surface roughness by manual polishing increased the fatigue limit between 40 and 25 % respectively. The fatigue limit of AISI 304 stainless steel wire was improved from 215 MPa to 650 MPa after …
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Influence of surface hardening on single crystal nickel-based superalloys
… of two surface hardening procedures, mechanical shot peening (MSP) and deep cold rolling (DCR), on the microstructures of single crystal nickel-based superalloys. These alloys have excellent high temperature properties, and consist of a randomly substituted face centred cubic matrix phase known …