Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


31824.pdf (4.31 MB)

ETD Abstract Container

Abstract Header

Design of Multi-Material Lattice Structures with Tailorable Material Properties using Density-Based Topology Optimization

Venugopal, Vysakh
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252070840125

Abstract Details

2019, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Topology optimization has gained widespread attention in the research and industrial community after the advent of Additive Manufacturing (AM). The nature of this manufacturing process made efficient building of parts with intricate geometries possible. Typically, parts used in aviation and aerospace applications are required to have less weight for fuel efficiency and higher load bearing capacity. To address this requirement, multi-material lattice structures with optimized material properties are designed. Topology optimization for optimized mechanical and thermal properties of the base cell of a lattice structure using multiple materials is the focus of the research reported in this thesis. A weighted multi-objective optimization model is defined to generate the unit cell. Volume constraints are defined with user-input volume fractions of individual material phases. Homogenization method is used to calculate the equivalent material property of the design domain comprising two materials (and void). A novel octant symmetry filter, and a prismatic density distribution filter is applied to generate lattice structures that does not require support structures while manufacturing using multi-material AM processes, specifically Directed Energy Deposition (DED). The unit cell of the lattice structure is optimized for high overall mechanical stiffness, low coefficient of thermal expansion, and low thermal conductivity. Two design examples are provided to show unit cells with and without the prismatic density filter. A Finite Element (FE) Analysis model is used to compare the deformations and nodal temperatures between the multi-material lattice structure and an equivalent design domain assigned with the homogenized material properties. The results from the FE analysis shows that the generated lattice structure and its computed effective material properties are accurate.
Sam Anand, Ph.D. (Committee Chair)
Manish Kumar, Ph.D. (Committee Member)
Kumar Vemaganti, Ph.D. (Committee Member)
62 p.
Mechanical Engineering
Additive Manufacturing; Topology Optimization; Multi-material lattice structures; Mechanical Stiffness; Thermal Expansion; Thermal Conductivity

Recommended Citations

Citations

  • Venugopal, V. (2019). Design of Multi-Material Lattice Structures with Tailorable Material Properties using Density-Based Topology Optimization [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252070840125

    APA Style (7th edition)

  • Venugopal, Vysakh. Design of Multi-Material Lattice Structures with Tailorable Material Properties using Density-Based Topology Optimization. 2019. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252070840125.

    MLA Style (8th edition)

  • Venugopal, Vysakh. "Design of Multi-Material Lattice Structures with Tailorable Material Properties using Density-Based Topology Optimization." Master's thesis, University of Cincinnati, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252070840125

    Chicago Manual of Style (17th edition)

ucin1553252070840125
567
© 2019, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.