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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"peening"”.
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The effect of laser shock peening and shot peening on the fatigue performance of aluminium alloy 7075
… 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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Bending Of Metallic Thin Foil Via High Energy Pulsed Laser Peening
Laser Peen Forming (LPF), a novel method used to form thin metallic engineering foils,is a manufacturing process utilizing strong shockwaves induced by high pressuresintroduced to the surface of a target by high energy, pulsed laser beams. It is a non-thermal,non-contact approach that improves the …
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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
… 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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Experimental Characterization and Finite Element Simulation of Laser Shock Peening Induced Surface Residual Stresses using Nanoindentation
… surface residual stress induced by laser shock peening. While the technique has been studied by a number of groups, accurate measurement using nanoindentation is hindered by a good method of estimating the contact area, which is the basis of all the calculations in the literature. Due to the …
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Effects of Laser Shock Peening on Residual Stress, Texture and Deformation Microstructure of Ti-6Al-4V Alloy
Laser shock peening (LSP) is a novel surface treatment process that generates deep compressive residual stresses and microstructural changes and thereby dramatically improves fatigue strength of critical metal aircraft engine parts. In the past, researchers have evaluated the mechanical effects of …
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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 rapidly …
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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 Effects of Laser Shock Peening on the Residual Stress and Corrosion Characteristics of Magnesium Alloy AZ91D for use as Biodegradable Implants
… residual stress on a material is Laser Shock Peening (LSP). Laser Shock Peening is a material process in which a high-pulsed laser creates a pressure shock wave that travels through the depth of the material, leaving high levels of compressive residual stress through its depth.This thesis will …
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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
… 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 gauge …
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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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The Role of Twinning in the Plastic Deformation of Alpha Phase Titanium
… 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 the …
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Effects of Chemical and Structural Heterogeneity on the Tribocorrosion Resistance of Metals in Aqueous Solutions
… surface was treated by femtosecond laser shock peening (fs-LSP) technique with ultra-low pulse energy to introduce structural heterogeneity. Treatment conditions (e.g., power density, direct ablation and confined ablation) significantly affected the ultimate peening effect and further surface …
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Origins and implications of intrinsic stress in hydrogenated amorphous silicon thin films
… is controlled by ion bombardment causing of peening the film, and leading to lattice distortion in the material. Conversely, tensile stress is created through bombarding ions collapsing nano-sized voids within the material, which are formed during the vapor-phase deposition. Combining our …
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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 prealloyed …
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Dry sliding and contact fatigue behavior of different high density Ni-Cu-Mo PM Steels
… 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 validated …
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Thermomechanical properties and performance of microfabricated solid oxide fuel cell ([mu]SOFC) structures
… growth and compressive stresses due to "atomic peening". Young's modulus was obtained by center deflection measurement of square membranes for films in mild compression, and from bulge tests for films in tension. The modulus (24-105GPa) was found to be highly dependent on deposition conditions, …
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Understanding the Structure-property Relationships of Solid-state Additively Manufactured Stainless-steel Coatings
… friction stir processing (FSP) and laser shock peening (LSP) post-surface treatments on the degradation resistance of CS 316L SS was investigated. By exploring these mechanisms, a useful roadmap for robust CS 316L SS development can be realized, which can control their inevitable degradation. …
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