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Design, Analysis, and Fabrication of Lattice Structures for Structural and Thermal Applications
Design, Analysis, and Fabrication of Lattice Structures for Structural and Thermal Applications
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151422
- ISBN
- 9798382610795
- DDC
- 621
- 서명/저자
- Design, Analysis, and Fabrication of Lattice Structures for Structural and Thermal Applications
- 발행사항
- [Sl] : Carnegie Mellon University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 163 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
- 주기사항
- Advisor: Shimada, Kenji.
- 학위논문주기
- Thesis (Ph.D.)--Carnegie Mellon University, 2024.
- 초록/해제
- 요약Designing lightweight, stiff, and thermally compliant structures is an ongoing challenge in various engineering industries, especially within aerospace. Aircraft and spacecraft are designed to withstand extreme structural loads and thermal changes with the minimum amount of weight possible. Advances in computational design and analysis, as well as metal additive manufacturing (AM), have created new opportunities to design and fabricate complex structures for loading conditions seen on aircraft and spacecraft. This thesis explores the application of lattice structures to various structural and thermal aerospace applications, analyzes them under their respective loading conditions, and the utilization of metal AM to fabricate many of the designs. Using unique lattice generation methods and bimetallic lattice unit cell designs, multiple components and processes are created to advance the adoption of AM for complex structures in the aerospace field.A lattice generation method based on the bubble-mesh method is used to create tetrahedral lattice structures with the ability to alter the following geometric parameters: the cell size/lattice density, strut diameter, and intersection rounding. A relationship between these parameters is evaluated and it is found that the strut diameter and intersection rounding have the greatest structural effects on the lattice. These findings are then used to apply these lattice structures to various aerospace components such as a jet engine bracket, airplane bearing bracket, and an optical instrument mounting bracket. The FEA results show that the latticed designs can withstand their respective loading conditions. Additionally, latticed cubes are created using this lattice generation method to understand their optimal printability. FEA is used again to explore the structural and thermal behavior of the latticed cubes during the metal AM process. The latticed cubes are additively manufactured and will be scanned to validate the FEA results. The lattice generation method is then used to re-design a payload adapter to explore a self-consuming spacecraft concept. The lattice is used to reduce the weight of the structure, but the gaps of the lattice will be filled with propellant so it can be extracted and used as fuel during a satellite mission. This work focuses on the structural integrity of the latticed payload adapter, and simulations are used to understand its structural behavior. It is then additively manufactured and tested under compression to validate the simulations. Finally, a separate bimetallic triangular lattice unit cell is designed, analyzed, and tested to explore bimetallic AM for fabricating controllable coefficient of thermal expansion (CTE) structures. These bimetallic structures are created so that their geometry and CTE of their respective materials minimize their expansion in a specified direction. Computational and analytical models are developed to describe this behavior, and multi-material/bimetallic AM is used to create these structures. The structures will then undergo CTE testing and the results are used to validate the computational and analytical models.
- 일반주제명
- Mechanical engineering
- 일반주제명
- Aerospace engineering
- 일반주제명
- Engineering
- 키워드
- Designs
- 키워드
- Fabrication
- 기타저자
- Carnegie Mellon University Mechanical Engineering
- 기본자료저록
- Dissertations Abstracts International. 85-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151422
■006m o d
■007cr#unu||||||||
■020 ▼a9798382610795
■035 ▼a(MiAaPQ)AAI31294296
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a621
■1001 ▼aAgwu, Uchechukwu Uche Okechukwu.▼0(orcid)0000-0002-8793-6260
■24510▼aDesign, Analysis, and Fabrication of Lattice Structures for Structural and Thermal Applications
■260 ▼a[Sl]▼bCarnegie Mellon University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a163 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-11, Section: B.
■500 ▼aAdvisor: Shimada, Kenji.
■5021 ▼aThesis (Ph.D.)--Carnegie Mellon University, 2024.
■520 ▼aDesigning lightweight, stiff, and thermally compliant structures is an ongoing challenge in various engineering industries, especially within aerospace. Aircraft and spacecraft are designed to withstand extreme structural loads and thermal changes with the minimum amount of weight possible. Advances in computational design and analysis, as well as metal additive manufacturing (AM), have created new opportunities to design and fabricate complex structures for loading conditions seen on aircraft and spacecraft. This thesis explores the application of lattice structures to various structural and thermal aerospace applications, analyzes them under their respective loading conditions, and the utilization of metal AM to fabricate many of the designs. Using unique lattice generation methods and bimetallic lattice unit cell designs, multiple components and processes are created to advance the adoption of AM for complex structures in the aerospace field.A lattice generation method based on the bubble-mesh method is used to create tetrahedral lattice structures with the ability to alter the following geometric parameters: the cell size/lattice density, strut diameter, and intersection rounding. A relationship between these parameters is evaluated and it is found that the strut diameter and intersection rounding have the greatest structural effects on the lattice. These findings are then used to apply these lattice structures to various aerospace components such as a jet engine bracket, airplane bearing bracket, and an optical instrument mounting bracket. The FEA results show that the latticed designs can withstand their respective loading conditions. Additionally, latticed cubes are created using this lattice generation method to understand their optimal printability. FEA is used again to explore the structural and thermal behavior of the latticed cubes during the metal AM process. The latticed cubes are additively manufactured and will be scanned to validate the FEA results. The lattice generation method is then used to re-design a payload adapter to explore a self-consuming spacecraft concept. The lattice is used to reduce the weight of the structure, but the gaps of the lattice will be filled with propellant so it can be extracted and used as fuel during a satellite mission. This work focuses on the structural integrity of the latticed payload adapter, and simulations are used to understand its structural behavior. It is then additively manufactured and tested under compression to validate the simulations. Finally, a separate bimetallic triangular lattice unit cell is designed, analyzed, and tested to explore bimetallic AM for fabricating controllable coefficient of thermal expansion (CTE) structures. These bimetallic structures are created so that their geometry and CTE of their respective materials minimize their expansion in a specified direction. Computational and analytical models are developed to describe this behavior, and multi-material/bimetallic AM is used to create these structures. The structures will then undergo CTE testing and the results are used to validate the computational and analytical models.
■590 ▼aSchool code: 0041.
■650 4▼aMechanical engineering
■650 4▼aAerospace engineering
■650 4▼aEngineering
■653 ▼aAdditive manufacturing
■653 ▼aDesigns
■653 ▼aCoefficient of thermal expansion
■653 ▼aFabrication
■690 ▼a0548
■690 ▼a0538
■690 ▼a0537
■71020▼aCarnegie Mellon University▼bMechanical Engineering.
■7730 ▼tDissertations Abstracts International▼g85-11B.
■790 ▼a0041
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161624▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
