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Design of variable thickness triply periodic surfaces for additive manufacturing

  • Gianpaolo Savio
  • Roberto Meneghello
  • Gianmaria Concheri
Full Research Article
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Abstract

Minimal surfaces are receiving a renewed interest in biomedical and industrial fields, due to the capabilities of additive manufacturing technologies which allow very complex shapes. In this paper, an approach for geometric modeling of variable thickness triply periodic minimal surfaces in a CAD environment is proposed. The approach consists of three main steps: the definition of an initial mesh, the adoption of a subdivision scheme and the assignment of a variable thickness by a differential offset. Moreover, the relationship between relative density and mesh thickness was established for two types of minimal surfaces: Schoen’s gyroid, Schwarz’ Primitive. The proposed method improves the main issues highlighted in literature in the modeling of cellular materials and allows to easily obtain a consistent polygonal mesh model satisfying functional requirements. Two test cases were presented: the first shows a gradient thickness gyroid; in the second the relative density obtained by topology optimization was adopted in our modeling approach using a Schwarz’ Primitive. In both cases, guidelines for selecting the geometric modeling parameters taking into account the specific additive manufacturing process constraints were discussed. The proposed method opens new perspectives in the development of effective CAD tools for additive manufacturing, improving the shape complexity and data exchange capacity in cellular solid modeling.

Keywords

Cellular materials Geometric modeling Design for additive manufacturing Triply periodic minimal surfaces 

Notes

Funding

This work was partially funded by the University of Padova, Department of Civil, Environmental and Architectural Engineering ICEA (Grant number BIRD175287/17, 2017).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Civil, Environmental and Architectural Engineering - Laboratory of Design Tools and Methods in Industrial EngineeringUniversity of PadovaPadovaItaly
  2. 2.Department of Management and Engineering - Laboratory of Design Tools and Methods in Industrial EngineeringUniversity of PadovaVicenzaItaly

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