Decomposition-Based Assembly Synthesis Based on Structural Considerations

Yetis, F. Arkin

doi:10.1115/detc2000/dac-14228

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…By viewing the problem as the optimal balance between structural performance and manufacturing cost, computational optimal assembly synthesis for structural products were attempted in References 15,16 for stamped sheet metal structures and in Reference 17 for extruded space frame structures. In the field of computer graphics, there also is recent work addressing the partitioning of product geometry into smaller components, so each can fit within the maximum printer size for additive manufacturing 18‐20 .…”

Section: Related Workmentioning

confidence: 99%

Multicomponent topology optimization of functionally graded lattice structures with bulk solid interfaces

2021

Numerical Meth Engineering

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This article presents a topology optimization method for structures consisting of multiple lattice components under a certain size, which can be manufactured with an additive manufacturing machine with a size limit and assembled via conventional joining processes, such as welding, gluing, riveting, and bolting. The proposed method can simultaneously optimize overall structural topology, partitioning to multiple components and functionally graded lattices within each component. The functionally graded lattice infill with guaranteed connectivity is realized by applying the Helmholtz PDE filter with a variable radius on the density field in the solid isotropic material with penalization (SIMP) method.The partitioning of an overall structure into multiple components is realized by applying the discrete material optimization (DMO) method, in which each material is interpreted as each component, and the size limit for each component imposed by a chosen additive manufacturing machine. A gradient-free coating filter realizes bulk solid boundaries for each component, which provide continuous mating surfaces between adjacent components to enable the subsequent joining. The structural interfaces between the bulk solid boundaries are extracted and assigned a distinct material property, which model the joints between the adjacent components. Several numeral examples are solved for demonstration. K E Y W O R D Sbulk solid interfaces, lattice infill, multicomponent structures, topology optimization INTRODUCTIONLattice structures exhibit superior structural properties such as low stiffness-to-weight ratio, robustness for random direction loads, damage resistance against defects, and extreme physical properties such as large energy absorption, 1,2 negative Poisson's ratio, 3,4 large thermal expansion, 5,6 and special acoustic absorption. 7,8 Owing to the recent advancement in additive manufacturing processes, especially those in metals, the fabrication and testing of engineered lattice structures have become much more accessible to researchers. Thompson et al. 9 reviewed recent work on design for additive manufacturing including the design of engineered lattice structures. They pointed out there was still a lack of systematic design method to overcome the complexity of lattice structures whose dimension spans from the micro/meso-scale to macro-scale. In addition to the structural complexity, additively manufactured lattice structures for industrial applications

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Section: Related Workmentioning

confidence: 99%

Multicomponent topology optimization of functionally graded lattice structures with bulk solid interfaces

2021

Numerical Meth Engineering

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Decomposition-Based Assembly Synthesis Based on Structural Considerations

Yetis

Saitou

2002

Journal of Mechanical Design

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An extension of decomposition-based assembly synthesis for structural modularity is presented where the early identification of shareable components within multiple structures is posed as an outcome of the minimization of estimated production costs. The manufacturing costs of components are estimated under given production volumes considering the economies of scale. Multiple structures are simultaneously decomposed and the types of welded joints at component interfaces are selected from a given library, in order to minimize the overall production cost and the reduction of structural strength due to the introduction of joints. A multiobjective genetic algorithm is utilized to allow effective examination of trade-offs between manufacturing cost and structural strength. A new joint-oriented representation of structures combined with a "direct" crossover is introduced to enhance the efficiency of the search. A case study with two aluminum space frame automotive bodies is presented to demonstrate that not all types of component sharing are economically justifiable under a certain production scenario.

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Decomposition-Based Assembly Synthesis for In-Process Dimensional Adjustability

Lee

2003

Journal of Mechanical Design

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Decomposition-Based Assembly Synthesis Based on Structural Considerations

Cited by 4 publications

References 17 publications

Multicomponent topology optimization of functionally graded lattice structures with bulk solid interfaces

Multicomponent topology optimization of functionally graded lattice structures with bulk solid interfaces

Decomposition-Based Assembly Synthesis Based on Structural Considerations

Decomposition-Based Assembly Synthesis for In-Process Dimensional Adjustability

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