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Effect of Single and Multistage Mandrel Forming on U-Shaped, Thin-Walled Metal Ellows-Type Expansion Joints
Effect of Single and Multistage Mandrel Forming on U-Shaped, Thin-Walled Metal Ellows-Type Expansion Joints
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153132
- ISBN
- 9798346830511
- DDC
- 001
- 저자명
- Magesh, Agraja.
- 서명/저자
- Effect of Single and Multistage Mandrel Forming on U-Shaped, Thin-Walled Metal Ellows-Type Expansion Joints
- 발행사항
- [Sl] : Purdue University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 203 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Sundararajan, Raji.
- 학위논문주기
- Thesis (Ph.D.)--Purdue University, 2024.
- 초록/해제
- 요약This study investigated the effects of single-stage and multi-stage (two, three, or four) mandrel cold-forming processes on stainless steel U-shaped, thin-walled profiles, with a particular focus on their impact on stress. These profiles, commonly used as metal expansion joints (also known as compensators or bellows), are essential components in industries such as aerospace, energy, and piping systems. The need for these joints to absorb thermal expansion and mechanical movement while maintaining structural integrity makes precise forming processes critical. In particular, the investigation examined the effects of incrementally increasing the number of forming stages, from one to four, on profile geometry, with particular emphasis on thickness variation, consistency, and stress distribution. Profile geometry and thickness were assessed using three-dimensional scanning, a coordinate measuring machine, and ultrasonic thickness measuring techniques. While these methods have limitations, they provide valuable insights into the formed profiles. Increasing the number of forming stages up to four reduced thickness variation by up to 5%, producing profiles that were more closely aligned with the theoretical design specifications. Stress, a crucial factor in the long-term performance of metal expansion joints, was also reduced by increasing the number of forming stages by up to 6% with four stages. Further reductions in stress and thickness variation could be achieved with more than four stages, though the improvements became less significant. A formula was developed to determine the minimum number of forming stages (Nmin) required for thin-walled U-profiles. Depending on the application, additional stages beyond Nminimproved profile accuracy and further reduced stress, offering manufacturers flexibility in meeting performance requirements.
- 일반주제명
- Software
- 일반주제명
- Cold
- 일반주제명
- Investigations
- 일반주제명
- Metal forming
- 일반주제명
- Design specifications
- 일반주제명
- Aerospace engineering
- 일반주제명
- Stress concentration
- 일반주제명
- Stress analysis
- 일반주제명
- Vibration
- 일반주제명
- Linear equations
- 일반주제명
- Metal fatigue
- 일반주제명
- Decision making
- 일반주제명
- Flexibility
- 일반주제명
- Stainless steel
- 일반주제명
- Deformation
- 일반주제명
- Geometry
- 일반주제명
- Materials science
- 기타저자
- Purdue University.
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798346830511
■035 ▼a(MiAaPQ)AAI31786111
■035 ▼a(MiAaPQ)Purdue27695127
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a001
■1001 ▼aMagesh, Agraja.
■24510▼aEffect of Single and Multistage Mandrel Forming on U-Shaped, Thin-Walled Metal Ellows-Type Expansion Joints
■260 ▼a[Sl]▼bPurdue University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a203 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Sundararajan, Raji.
■5021 ▼aThesis (Ph.D.)--Purdue University, 2024.
■520 ▼aThis study investigated the effects of single-stage and multi-stage (two, three, or four) mandrel cold-forming processes on stainless steel U-shaped, thin-walled profiles, with a particular focus on their impact on stress. These profiles, commonly used as metal expansion joints (also known as compensators or bellows), are essential components in industries such as aerospace, energy, and piping systems. The need for these joints to absorb thermal expansion and mechanical movement while maintaining structural integrity makes precise forming processes critical. In particular, the investigation examined the effects of incrementally increasing the number of forming stages, from one to four, on profile geometry, with particular emphasis on thickness variation, consistency, and stress distribution. Profile geometry and thickness were assessed using three-dimensional scanning, a coordinate measuring machine, and ultrasonic thickness measuring techniques. While these methods have limitations, they provide valuable insights into the formed profiles. Increasing the number of forming stages up to four reduced thickness variation by up to 5%, producing profiles that were more closely aligned with the theoretical design specifications. Stress, a crucial factor in the long-term performance of metal expansion joints, was also reduced by increasing the number of forming stages by up to 6% with four stages. Further reductions in stress and thickness variation could be achieved with more than four stages, though the improvements became less significant. A formula was developed to determine the minimum number of forming stages (Nmin) required for thin-walled U-profiles. Depending on the application, additional stages beyond Nminimproved profile accuracy and further reduced stress, offering manufacturers flexibility in meeting performance requirements.
■590 ▼aSchool code: 0183.
■650 4▼aSoftware
■650 4▼aCold
■650 4▼aInvestigations
■650 4▼aMetal forming
■650 4▼aDesign specifications
■650 4▼aAerospace engineering
■650 4▼aStress concentration
■650 4▼aStress analysis
■650 4▼aVibration
■650 4▼aLinear equations
■650 4▼aMetal fatigue
■650 4▼aDecision making
■650 4▼aFlexibility
■650 4▼aStainless steel
■650 4▼aDeformation
■650 4▼aGeometry
■650 4▼aMaterials science
■690 ▼a0538
■690 ▼a0794
■71020▼aPurdue University.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0183
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165170▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


