Impact of Surface Roughness and Porosity on Lattice Structures Fabricated by Additive Manufacturing- A Computational Study

Jiang, Panwei; Rifat, Mustafa; Basu, Saurabh

doi:10.1016/j.promfg.2020.05.114

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…With the manner of the PoE formula defined in Definitions A1-A3, we can write its forward kinematics for arbitrary joint values as a subsequent product of matrix exponentials of Equation (2), each corresponding to a screw motion.…”

Section: Design Of Afm and Kinematics Analysismentioning

confidence: 99%

“…The surfaces produced by these additive processes exhibit a naturally rough texture. This roughness diminishes the visual appeal of the manufactured parts and poses challenges regarding material adhesion and bonding [2]. Achieving a smoother surface becomes crucial in applications where optimal adhesion and consistent material bonding are imperative for the functionality and longevity of the final product.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Joint Path Planning of a New Virtual-Linkage-Based Redundant Finishing Stage for Additive-Finishing Integrated Manufacturing

Yu,

Jeon,

Jeong

et al. 2023

Mathematics

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This paper describes the optimal path planning of a redundant finishing mechanism developed for joint space-based additive-finishing integrated manufacturing (AFM). The research motivation results from an inevitable one-sided layout of a finishing stage (FS) with regard to the additive stage (AS) in the AFM. These two stages share a 2-dof bed stage (BS), and the FS can lightly shave off the rough-surfaced 3D print on the bed. Since the FS located at the side of the AS cannot reach all the target points of the 3D print, the bed should be able to rotate the 3D print about the z-axis and translate it in the z-axis. As a result, the AS has 4-dof joints for 2P and 1P1R during the additive process with AS-BS, and FS has 4-dof and 2-dof integrated joints for 2P2R and 1P1R during the finishing process with FS-BS, respectively. For the kinematic modeling of the FS part and the BS, the virtual linkage connecting the bed frame origin and the FS’s joint frame for approaching the BS is considered to realize seamless kinematic redundancy. The minimum Euclidian norm of the joint velocity space is the objective function to find the optimal joint space solution for a given tool path. To confirm the feasibility of the developed joint path planning algorithm in the proposed FS-BS mechanism, layer-by-layer slicing of a given 3D print’s CAD model and tool path generation were performed. Then, the numerical simulations of the optimal joint path planning for some primitive 3D print geometries were conducted. As a result, we confirmed that the maximum and mean pose error in point-by-point only, with the developed optimal joint path planning algorithm, were less than 202 nm and 153 nm, respectively. Since precision and general machining accuracies in tool path generation are in the range of ±10 μm and 20 μm, the pose error in this study fully satisfies the industry requirements.

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Section: Design Of Afm and Kinematics Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Joint Path Planning of a New Virtual-Linkage-Based Redundant Finishing Stage for Additive-Finishing Integrated Manufacturing

Yu,

Jeon,

Jeong

et al. 2023

Mathematics

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“…9,10 For this reason, the scientific and technical community is working to improve the manufacturing processes to control the imperfections and to include the effects of imperfections in both verification and design processes. 11–15…”

Section: Introductionmentioning

confidence: 99%

Fabrication defects and limitations of AlSi10Mg lattice structures manufactured by selective laser melting

Ossola

Shapiro

Pate

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Additive manufacturing has enabled the production of lattice structures with tailored mechanical properties. However, process limitations still exist, affecting the quality of the struts, practically limiting sizes and types of printable unit cells. Typically, long, thin, unsupported horizontal struts exhibit large deviations from ideal geometries, due to high surface roughness and internal porosity. AlSi10Mg specimens were designed and fabricated by laser powder bed fusion to investigate the role of strut orientation, size, and overhang length using different sets of process parameters. Visual inspection, three-dimensional scanning, and metallographic inspection of the cross-sections were performed. A quality control methodology based on dimensional and geometric tolerances has been defined in order to quantitatively characterize the quality of the struts. Optimized process parameters were selected and used to fabricate octet-truss specimens which were then characterized by compression testing.

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“…Including the mapping of the defects would produce a far better approximation of the mechanical properties of LMD specimens. Jiang et al incorporated various forms of defects into the finite element modelling of AM fabricated lattice structures to predict the stress-strain and stiffness as a function of the introduced defects [212].…”

Section: Limitations and Recommendations For Future Workmentioning

confidence: 99%

Laser metal deposition materials-process-performance characterization studies

Tan¹

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Impact of Surface Roughness and Porosity on Lattice Structures Fabricated by Additive Manufacturing- A Computational Study

Cited by 9 publications

References 28 publications

Optimal Joint Path Planning of a New Virtual-Linkage-Based Redundant Finishing Stage for Additive-Finishing Integrated Manufacturing

Optimal Joint Path Planning of a New Virtual-Linkage-Based Redundant Finishing Stage for Additive-Finishing Integrated Manufacturing

Fabrication defects and limitations of AlSi10Mg lattice structures manufactured by selective laser melting

Laser metal deposition materials-process-performance characterization studies

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