Abstract:This study evaluates the effect of post-manufacturing treatment on the compressive performance of additively manufactured components. The components were thin cylindrical shells with an aspect ratio of 25:1 manufactured using laser powder bed fusion and that were then surface treated by means of sandblasting or turning. The as-printed and subsequently surface treated samples were uniaxially compressed until failure to depict the effect of the surface condition on the compressive mechanical behavior. The result… Show more
“…Laser polishing can also be profitably used to ease the manufacture of full density or near full density components [136][137][138]. The powder bed is made up of numerous voids.…”
Section: Analysis and Applications Of Laser Polishing: Criticality An...mentioning
Additive manufacturing is a vanguard production technology that has contributed greatly to speed up replacing on the market of complex-shaped components. A delicate and unavoidable phase of additive technology is that relating to the post-processing of the components, especially the finishing process. Post-processing needs to be automated and made scalable so that the technology can actually be adopted also for mass production. In this respect, an emerging post-processing technology suitable for surface finishing, not in contact and easily automatable, is the one that involves the use of laser sources, known by the name of laser polishing. Laser polishing is spreading, in fact, more and more strongly, in the field of manufacturing as a valid alternative to conventional technologies for the surface finishing of metallic components obtained by additive processes. Laser polishing is widely considered very suitable to improving the surface finish of metal components. When compared with the conventional finishing technologies, laser polishing has many benefits in terms of costs and process times especially if automated, through the use of CNC systems and scanning heads. In this manuscript, the knowledge of this technology is deepened through a review of the relevant literature that highlights the aspects of the interaction of the laser beam with the metal alloys most frequently used in 3D printing, without neglecting the importance of the thermo-mechanical properties that derive from it. The analysis conducted on the technology of laser polishing aims therefore at evaluating the potential applications in industrial engineering, mainly with regard to the surfaces quality achievable as a result of the polishing of metal components fabricated by additive manufacturing.
“…Laser polishing can also be profitably used to ease the manufacture of full density or near full density components [136][137][138]. The powder bed is made up of numerous voids.…”
Section: Analysis and Applications Of Laser Polishing: Criticality An...mentioning
Additive manufacturing is a vanguard production technology that has contributed greatly to speed up replacing on the market of complex-shaped components. A delicate and unavoidable phase of additive technology is that relating to the post-processing of the components, especially the finishing process. Post-processing needs to be automated and made scalable so that the technology can actually be adopted also for mass production. In this respect, an emerging post-processing technology suitable for surface finishing, not in contact and easily automatable, is the one that involves the use of laser sources, known by the name of laser polishing. Laser polishing is spreading, in fact, more and more strongly, in the field of manufacturing as a valid alternative to conventional technologies for the surface finishing of metallic components obtained by additive processes. Laser polishing is widely considered very suitable to improving the surface finish of metal components. When compared with the conventional finishing technologies, laser polishing has many benefits in terms of costs and process times especially if automated, through the use of CNC systems and scanning heads. In this manuscript, the knowledge of this technology is deepened through a review of the relevant literature that highlights the aspects of the interaction of the laser beam with the metal alloys most frequently used in 3D printing, without neglecting the importance of the thermo-mechanical properties that derive from it. The analysis conducted on the technology of laser polishing aims therefore at evaluating the potential applications in industrial engineering, mainly with regard to the surfaces quality achievable as a result of the polishing of metal components fabricated by additive manufacturing.
“…As a crucial engineering structure, the thin-walled steel cylindrical shell has obtained widespread application in most industrial fields. This structure tends to buckle when subjected to axial compression loads, and buckling failure is a critical concern in the design work of thin-walled cylindrical shell structures [1][2][3][4][5][6]. A large number of cylindrical shell buckling experiments have been carried out, and researchers have found that the experimentally observed buckling loads are far short of the theoretical predicted buckling loads of perfect shells [7,8].…”
A thin-walled steel cylindrical shell is a common engineering structure that has an efficient load-carrying capacity. This structure is more easily subjected to partial axial compression loads in application, and buckling is the main failure mode. However, there are few available design methods for partial axially compressed steel cylindrical shells. Motivated by this, a design method called the localized perturbation load approach (LPLA) is proposed in this paper. The finite element framework for the application of LPLA is established. The location and number of perturbation loads are determined by considering the imperfection sensitivity and the buckling failure mode of partial axial compressed cylinders. A series of buckling experiments are carried out to validate the LPLA method. In addition, the reliability of LPLA for the design of cylindrical shells with different imperfection locations and dimensions is also verified. The results show that LPLA can give conservative and reliable lower-bound buckling loads. Therefore, LPLA can be used as a design method for thin-walled steel cylindrical shell structures under partial axial compression in actual engineering.
“…For postprocessing of LPBF‐processed components, chemical (e.g., electrochemical polishing), physical (e.g., thermal spraying), or mechanical methods (e.g., blasting treatments, milling) are applied. [ 37–40 ] The mechanical method of blasting is thereby widespread as first postprocessing step after the LPBF process. [ 32,37 ] It will introduce residual compressive stress in the component surface due to plastic deformation, which has a positive effect on, e.g., hardness, fatigue, and tensile strength, as seen for other bulk materials.…”
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