Method and apparatus for modeling and designing multi-dimensional cellular structures for additive manufacturing

A cell and microstructure technology, applied in the direction of additive processing, 3D modeling, general control system, etc., can solve problems such as the limitations of general microstructure feature changes

Pending Publication Date: 2020-07-21
THE HONG KONG UNIV OF SCI & TECH
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Problems solved by technology

However, the expressive power of these traditional methods is severely limited in characterizing changes in general microstructures
Therefore, existing

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  • Method and apparatus for modeling and designing multi-dimensional cellular structures for additive manufacturing
  • Method and apparatus for modeling and designing multi-dimensional cellular structures for additive manufacturing
  • Method and apparatus for modeling and designing multi-dimensional cellular structures for additive manufacturing

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Embodiment Construction

[0044] As mentioned earlier, the modeling of conformal and variable cellular structures has become an area of ​​increasing research interest in design and fabrication processes. When designing variable cell structures, the goal is to ensure complete geometric connections between the cells of the microstructure. For microstructure cells whose interface between adjacent cells lacks complete geometric connections, the unconnected parts cannot bear external loads, and there are often fabrication difficulties in additive manufacturing. Areas of interface mismatch can lead to stress concentrations and should be completely avoided in the design.

[0045] A set of constraints can be set during the design process on the complete geometric connectivity between all microstructural cells. But this approach has severe constraints on the design options and leads to potential difficulties in convergence. Smoothing can be done as a post-processing to improve geometric connectivity after gen...

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Abstract

Modeling, constructing, and designing conformal cellular structures with spatially variable and graded microstructures that have full geometric continuity is disclosed, which includes defining a global structural domain, where the microstructures are generated for a global mesh, defining a unit structure as a base cell using a level set function, which allows for beams, trusses, shells, and solids, transforming and mapping the base cell into each element of the global mesh using an isoparametric transformation, which creates a conformal cellular structure in accordance with a set of requirements on distribution of material and/or mechanical properties, and applying a global cutting function to guarantee geometric continuity in connections on the common face of any two neighboring cells ofthe structure. As a result, more complex geometric shapes and features can be generated at the cell level, while maintaining the specified geometric connectivity across the cells of the structure.

Description

[0001] Inventors: Michael Wang Yu and Wang Yiqiang [0002] Cross References to Related Applications [0003] This application claims priority to US Provisional Application Serial No. 62 / 606,512, filed September 27, 2017, entitled "Methods for Modeling and Designing Three-Dimensional Cellular Structures for Additive Manufacturing." The entire content of this provisional application is hereby incorporated by reference. technical field [0004] The present disclosure relates generally to structural design and additive manufacturing. For example, a technique is provided for modeling and designing conformal cellular structures consisting of spatially variable gradient distributed and continuously connected microstructures for additive manufacturing. Background technique [0005] Cellular porous structures are generally defined as three-dimensional (3-D) structures composed of low-scale microstructures whose geometric features can span several orders of magnitude from tens of n...

Claims

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Application Information

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IPC IPC(8): G06F30/10B33Y50/00G06F113/10
CPCB33Y50/00G06F30/00B29C64/386G05B19/4099G05B2219/35134G05B2219/49023G06F30/17G06T17/05
Inventor 王煜王毅强
Owner THE HONG KONG UNIV OF SCI & TECH
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