Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Sandeep Keerthi WSU Thesis Report.pdf (5.28 MB)

ETD Abstract Container

Abstract Header

Low Velocity Impact and RF Response of 3D Printed Heterogeneous Structures

Keerthi, Sandeep
http://rave.ohiolink.edu/etdc/view?acc_num=wright1514392165695378

Abstract Details

2017, Master of Science in Mechanical Engineering (MSME), Wright State University, Mechanical Engineering.
Three-dimensional (3D) printing, a form of Additive manufacturing (AM), is currently being explored to design materials or structures with required Electro-Mechanical-Physical properties. Microstrip patch antennas with a tunable radio-frequency (RF) response are a great candidate for 3D printing process. Due to the nature of extrusion based layered fabrication; the processed parts are of three-layer construction having inherent heterogeneity that affects structural and functional response. The purpose of this study is to identify the relationship between the anisotropy in dielectric properties of AM fabricated acrylonitrile butadiene styrene (ABS) substrates in the RF domain and resonant frequencies of associated patch antennas and also to identify the response of the antenna before and after a low velocity impact. In this study, ANSYS high frequency structure simulator (HFSS) is utilized to analyze RF response of patch antenna and compared with the experimental work. First, a model with dimensions of 50 mm x 50 mm x 5 mm is designed in Solidworks and three separate sets of samples are fabricated at three different machine preset fill densities using an extrusion based 3D printer LulzBot TAZ 5. The actual solid volume fraction of each set of samples is measured using a 3D X-ray computed tomography microscope. The printed materials appeared to exhibit anisotropy such that the thickness direction dielectric properties are different from the planar properties. The experimental resonant frequency for one fill-density is combined with ANSYS-HFSS simulation results to estimate the bulk dielectric constant of ABS and the equivalent dielectric properties in planar and thickness directions. The bulk dielectric properties are then used in HFSS models for other two fill densities and the simulated results appear to match reasonably well with experimental findings. The similar HFSS modeling scheme was adopted to understand the effect of material heterogeneity on RF response. In addition, a hybrid structure with dimensions of 50 mm x 50 mm x 20 mm is designed with the first 15 mm thickness being a cellular BCC structure and the other 5 mm being a solid cuboid. These samples are printed on an extrusion based 3D printer Stratasys uPrint using ABS. A patch antenna is embedded at the interface of the solid and the cellular structure. Both ABAQUS finite element modeling and experimental methods are used to understand the load-displacement and the energy absorption behavior of the hybrid structure under low velocity impact loadings. The hybrid structure is impacted on both sides to investigate the damage tolerance capabilities of embedded electronic components.
Ahsan Mian, Ph.D. (Advisor)
Raghavan Srinivasan, Ph.D. (Committee Member)
Joy Gockel, Ph.D. (Committee Member)
144 p.
Aerospace Engineering; Automotive Engineering; Design; Electrical Engineering; Mechanical Engineering; Mechanics; Plastics; Technology
Additive Manufacturing; AM; 3D Printing; Acrylonitrile Butadiene Styrene; ABS; Microstrip Patch Antenna; Porous; ANSYS-HFSS; ABAQUS-Explicit Dynamics; Hybrid Structure; Lattice Structure; BCC; RF applications; Low Velocity Impact; Dielectric material

Recommended Citations

Citations

  • Keerthi, S. (2017). Low Velocity Impact and RF Response of 3D Printed Heterogeneous Structures [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1514392165695378

    APA Style (7th edition)

  • Keerthi, Sandeep. Low Velocity Impact and RF Response of 3D Printed Heterogeneous Structures. 2017. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1514392165695378.

    MLA Style (8th edition)

  • Keerthi, Sandeep. "Low Velocity Impact and RF Response of 3D Printed Heterogeneous Structures." Master's thesis, Wright State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1514392165695378

    Chicago Manual of Style (17th edition)

wright1514392165695378
1,141
© 2017, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.
Release 3.2.12