Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Dissertation_ZongyueFan.pdf (23.01 MB)

Supplemental Files

File List


ETD Document Approval Form 06012020.pdf (155.45 KB)

ETD Abstract Container

Abstract Header

A Lagrangian Meshfree Simulation Framework for Additive Manufacturing of Metals

Fan, Zongyue
http://orcid.org/0000-0001-8695-5999
http://rave.ohiolink.edu/etdc/view?acc_num=case1619737226226133

Abstract Details

2021, Doctor of Philosophy, Case Western Reserve University, EMC - Mechanical Engineering.
We present a powder-scale computational framework to predict the microstructure evolution of metals in Powder Bed Fusion Additive Manufacturing (PBF AM) processes based on the Hot Optimal Transportation Meshfree (HOTM) method. The powder bed is modeled through Discrete Element Method (DEM) as discrete and deformable three-dimensional bodies by integrating statistic information from experiments, including particle size and shape, and powder packing density. Tractions in Lagrangian framework are developed to model the recoil pressure and surface tension. The laser beam is applied to surfaces of particles and substrate dynamically as a heat flux with user-specified beam size, power, scanning speed and path. The linear momentum and energy conservation equations are formulated in the Lagrangian configuration and solved simultaneously in a monolithic way by the HOTM method to predict the deformation, temperature, contact mechanisms and fluid-structure interactions in the powder bed. The numerical results are validated against benchmark tests and single track experiments. Various powder bed configurations, particle size distributions, laser powers and speeds are investigated to understand the influence of dynamic contact and inelastic material behavior on the deformation, heat transfer and phase transition of the powder bed. The formation of defects in the microstructure of 3D printed metals, including pores, partially and un-melted particles, are predicted by the proposed computational scheme.
Bo Li (Committee Chair)
Yasuhiro Kamotani (Committee Member)
John Lewandowski (Committee Member)
Ya-Ting Liao (Committee Member)
183 p.
Mechanical Engineering
Additive Manufacturing, Powder Bed Fusion, Selective Laser Melting, 3D Printing, Hot Optimal Transportation Method, meshfree method, Lagrangian, variational,

Recommended Citations

Citations

  • Fan, Z. (2021). A Lagrangian Meshfree Simulation Framework for Additive Manufacturing of Metals [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1619737226226133

    APA Style (7th edition)

  • Fan, Zongyue. A Lagrangian Meshfree Simulation Framework for Additive Manufacturing of Metals. 2021. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1619737226226133.

    MLA Style (8th edition)

  • Fan, Zongyue. "A Lagrangian Meshfree Simulation Framework for Additive Manufacturing of Metals." Doctoral dissertation, Case Western Reserve University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1619737226226133

    Chicago Manual of Style (17th edition)

case1619737226226133
305
© 2021, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.