... exit burr. When drilling stacks of several workpieces, exit and entry burrs are produced simultaneously at the interfaces. The presence of burrs can degrade the static and fatigue strength of the parts and assemblies containing them. An example concerns the burrs formed at the interface during...

..., whether laser forming alters the fatigue performance of metal foam has not been well understood. This study focuses on the tension-to-tension fatigue behavior of closed-cell metal foam before and after laser forming. Fatigue tests were conducted at different load levels on as-received and laser treated...

... or HIP'ing may also still be needed for EBM parts to reduce porosity and modifying the microstructure to improve mechanical performance. Even though the fatigue performance of the specimens was inferior to wrought material and, would therefore, not likely be considered for use in the fabrication...

...Chang Ye; Gary J. Cheng Nanocomposite and multiphase structures have become more important nowadays to enhance the mechanical properties of materials. Laser shock peening (LSP) is one of the most efficient ways to increase component fatigue life. In this paper, numerical and experimental studies...

... with the rate-dependent (isothermal) experimental results. The temperature-dependent material model is furthermore applied to simulative thermomechanical fatigue tests, designed to represent the temperature and stress-strain cycling associated with the most damaging phase of the die cycle. The model is shown...

... for rapid joint fabrication in volume production. Further study revealed superior static and fatigue strength from the friction stir blind riveting process, when compared with conventional spot welding, which suggests potential for reduction in the number of joints required in a structure. Shriver...

...Sinisa Vukelic; Youneng Wang; Jeffrey W. Kysar; Y. Lawrence Yao The process of laser shock peening induces compressive residual stresses in a material to improve material fatigue life. For micron sized laser beams, the size of the laser-target interaction zone is of the same order of magnitude...

... density, usually no less than 10 9 – 10 10 W / cm 2 . Significant improvements in the overall performance including wear and corrosion resistance, fatigue, and creep properties are found for IBSP treated pure Cu and 316L stainless steel, attributable to the formation of nonequilibrium microstructures...

..., since it has the potential to improve many surface characteristics, such as low- and high-cycle fatigue strengths, surface finish, surface hardness, corrosion resistance, wear resistance, etc. The present study focuses on the surface roughness, microhardness, surface integrity, and fatigue life aspects...

.... The residual stress is measured using Raman scattering. This work presents a fundamental base for the application of laser shock peening in brittle materials to generate large compressive residual stress and plastic deformation for better mechanical properties, such as fatigue life and fracture toughness...

... in a special tool holder. The process not only improves surface finish but also imposes favorable compressive residual stresses in functional surfaces, which can lead to long fatigue life. Most research in the past focused on experimental studies. There is still a special need for a reliable finite element...

...A. Sahaya Grinspan; R. Gnanamoorthy Introduction of compressive residual stresses on the fatigue-loaded components is one of the techniques followed to improve the fatigue life of industrial components. Oil jet peening is a surface modification process for the introduction of compressive residual...

...Yajun Fan; Youneng Wang; Sinisa Vukelic; Y. Lawrence Yao Laser shock peening (LSP) is an innovative process which imparts compressive residual stresses in the processed surface of metallic parts to significantly improve fatigue life and fatigue strength of this part. In opposing dual sided LSP...

...Benxin Wu; Yung C. Shin Laser shock peening (LSP) is emerging as a competitive alternative technology to classical treatments to improve fatigue and corrosion properties of metals for a variety of important applications. LSP is often performed under a water confinement regime, which involves...

...J. Aghazadeh Mohandesi; Mohammad A. Rafiee; O. Maffi; P. Saffarzadeh Dependence of the yield and fatigue strength of steel bolts with composition in accordance to AISI 1035 manufactured by thread rolling and machining process on dislocation density were investigated. The results indicate...

... system. The tensile-shear, cross-tension, fatigue, and impact performances of self-piercing riveted joints using the new device are compared to those of spot-welded joints on aluminum sheets. The experiment has proven that the new SPR joints have provided a similar or higher strength than resistance spot...

... is critical for component performance such as fatigue and wear. Due to the small size of this region, mechanical behavior of this shallow layer is hard to measure using traditional material testing. With the nanoindentation method, mechanical behavior (nanohardness and modulus) at the microscale in subsurface...

...Zhonghua Luo and; Zhiliang Zhang This technical brief discusses optimum design of a cold extrusion compound container. First, the formulae of stresses for each component in the container and of shrink-fit pressure are derived. Next, the fatigue strength theory of the container is described by means...

...J. Zhang; D. Pirzada; C. C. Chu; G. J. Cheng Analysis of the laser forming process has been focused on geometry, yield strength, and microstructure change in the past. However fatigue life has been the primary concern for engineering components in many applications. For laser forming to become...

...Wenwu Zhang; Y. Lawrence Yao; I. C. Noyan Microscale Laser Shock Peening (LSP), also known as Laser Shock Processing, is a technique that can be potentially applied to manipulate residual stress distributions in metal film structures and thus improve the fatigue performances of micro-devices made...