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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...
Effect of Single and Multistage Mandrel Forming on U-Shaped, Thin-Walled Metal Ellows-Type Expansion Joints

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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  
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MARC

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■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.

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