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Reduced-Order Modelling of Residual Stresses and Distortions in Welded and Additively Manufactured Components
Reduced-Order Modelling of Residual Stresses and Distortions in Welded and Additively Manu...
Reduced-Order Modelling of Residual Stresses and Distortions in Welded and Additively Manufactured Components

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자료유형  
 학위논문 서양
최종처리일시  
20260202103642
ISBN  
9798314874219
DDC  
620
저자명  
Jin, Zetao.
서명/저자  
Reduced-Order Modelling of Residual Stresses and Distortions in Welded and Additively Manufactured Components
발행사항  
[Sl] : University of Michigan, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
227 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Advisor: Dong, Pingsha.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2025.
초록/해제  
요약Welding, particularly in its modern forms such as fusion-based additive manufacturing (AM), has been viewed as a key enabler for advancing Construction 4.0 to support environmental sustainability and national security. A major challenge in the design and manufacture of welded structures is how to effectively estimate residual stresses and distortions that have been shown to impact not only manufacturability but also the structure's fitness-for-service (FFS). Excessive distortions can lead to time-consuming and costly rework in downstream modular assembly and introduce secondary bending stress that can have detrimental effects on fatigue performance. These issues become even more pronounced as lightweight designs are increasingly adopted. Due to the complex multi-physics and multi-scale nature of residual stress generation in welding and AM processes, particularly in structural contexts, direct numerical modeling for engineering applications still remains impractical even with today's computational power, in addition to the fact that some aspects of high-temperature material behaviors under rapid melting, heating, and cooling conditions are still not fully understood. Available experimental residual stress measurement methods are limited in applicability, particularly for actual components, and are subject to interpretation, resulting in significant variability as documented in the literature. A critical assessment of the state-of-the-art research on residual stress generation mechanisms suggests that a reduced-order modeling procedure should be considered. As such, a physics-based analytical model can be introduced for capturing the lower-order parameters governing residual stress development, while the finite element method can be used to extend the analytical model to complex structural configurations, e.g., additively manufactured components. Along this line, this study demonstrates that a characteristic residual stress distribution for FFS purposes can be captured using an analytical scheme based on two key parameters: (1) the plastic zone (its size and shape), and (2) the limit elastic strain state within the plastic zone. To further improve its applicability to lightweight thin section structures, the analytical method has been further extended by introducing a novel heat source modeling method. The closed-form plastic zone estimation method coupled with a novel analytical thermomechanical model has been shown to provide an effective estimation of full field residual stress distributions for various engineering components, e.g., pressure vessels and piping components. Additionally, a physically consistent two-dimensional finite element modeling procedure is developed to estimate residual stress under three-dimensional welding conditions, which incorporates an analytical heat flow solution and a sub-domain-based model. The framework's effectiveness is validated by time-dependent and sequentially coupled thermomechanical simulations and well-documented experimental data. The presented reduced-order modeling framework provides a physically sound and computationally efficient solution for consistently estimating residual stresses and distortions in welded and AM components. A key contribution of this work is that the resulting residual stress solutions have been selected for adoption by the international FFS code, i.e., API 579 RP-1/ASME FFS-1 Annex 9D for prescribing residual stress distributions for performing fracture mechanics-based FFS assessment. The framework also includes a robust distortion estimation procedure that enables efficient modular design and assembly of advanced lightweight structures. In addition, the reduced-order modeling procedure is shown to be highly effective for characterizing residual stress and distortion development in AM components, which is an important element in achieving rapid qualification and certification for deploying metal AM components in safety-critical applications.
일반주제명  
Engineering
일반주제명  
Naval engineering
일반주제명  
Mechanical engineering
일반주제명  
Materials science
키워드  
Residual stress
키워드  
Welding
키워드  
Additive manufacturing
키워드  
Reduced-order modelling
키워드  
Finite element
키워드  
Fitness-for-service assessment
기타저자  
University of Michigan Naval Architecture & Marine Engineering
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

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■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2025
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■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
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■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2025.
■520    ▼aWelding,  particularly  in  its  modern  forms  such  as  fusion-based  additive  manufacturing  (AM),  has  been  viewed  as  a  key  enabler  for  advancing  Construction  4.0  to  support  environmental  sustainability  and  national  security.  A  major  challenge  in  the  design  and  manufacture  of  welded  structures  is  how  to  effectively  estimate  residual  stresses  and  distortions  that  have  been  shown  to  impact  not  only  manufacturability  but  also  the  structure's  fitness-for-service  (FFS).  Excessive  distortions  can  lead  to  time-consuming  and  costly  rework  in  downstream  modular  assembly  and  introduce  secondary  bending  stress  that  can  have  detrimental  effects  on  fatigue  performance.  These  issues  become  even  more  pronounced  as  lightweight  designs  are  increasingly  adopted.  Due  to  the  complex  multi-physics  and  multi-scale  nature  of  residual  stress  generation  in  welding  and  AM  processes,  particularly  in  structural  contexts,  direct  numerical  modeling  for  engineering  applications  still  remains  impractical  even  with  today's  computational  power,  in  addition  to  the  fact  that  some  aspects  of  high-temperature  material  behaviors  under  rapid  melting,  heating,  and  cooling  conditions  are  still  not  fully  understood.  Available  experimental  residual  stress  measurement  methods  are  limited  in  applicability,  particularly  for  actual  components,  and  are  subject  to  interpretation,  resulting  in  significant  variability  as  documented  in  the  literature.  A  critical  assessment  of  the  state-of-the-art  research  on  residual  stress  generation  mechanisms  suggests  that  a  reduced-order  modeling  procedure  should  be  considered.  As  such,  a  physics-based  analytical  model  can  be  introduced  for  capturing  the  lower-order  parameters  governing  residual  stress  development,  while  the  finite  element  method  can  be  used  to  extend  the  analytical  model  to  complex  structural  configurations,  e.g.,  additively  manufactured  components.  Along  this  line,  this  study  demonstrates  that  a  characteristic  residual  stress  distribution  for  FFS  purposes  can  be  captured  using  an  analytical  scheme  based  on  two  key  parameters:  (1)  the  plastic  zone  (its  size  and  shape),  and  (2)  the  limit  elastic  strain  state  within  the  plastic  zone.  To  further  improve  its  applicability  to  lightweight  thin  section  structures,  the  analytical  method  has  been  further  extended  by  introducing  a  novel  heat  source  modeling  method.  The  closed-form  plastic  zone  estimation  method  coupled  with  a  novel  analytical  thermomechanical  model  has  been  shown  to  provide  an  effective  estimation  of  full  field  residual  stress  distributions  for  various  engineering  components,  e.g.,  pressure  vessels  and  piping  components.  Additionally,  a  physically  consistent  two-dimensional  finite  element  modeling  procedure  is  developed  to  estimate  residual  stress  under  three-dimensional  welding  conditions,  which  incorporates  an  analytical  heat  flow  solution  and  a  sub-domain-based  model.  The  framework's  effectiveness  is  validated  by  time-dependent  and  sequentially  coupled  thermomechanical  simulations  and  well-documented  experimental  data.  The  presented  reduced-order  modeling  framework  provides  a  physically  sound  and  computationally  efficient  solution  for  consistently  estimating  residual  stresses  and  distortions  in  welded  and  AM  components.  A  key  contribution  of  this  work  is  that  the  resulting  residual  stress  solutions  have  been  selected  for  adoption  by  the  international  FFS  code,  i.e.,  API  579  RP-1/ASME  FFS-1  Annex  9D  for  prescribing  residual  stress  distributions  for  performing  fracture  mechanics-based  FFS  assessment.  The  framework  also  includes  a  robust  distortion  estimation  procedure  that  enables  efficient  modular  design  and  assembly  of  advanced  lightweight  structures.  In  addition,  the  reduced-order  modeling  procedure  is  shown  to  be  highly  effective  for  characterizing  residual  stress  and  distortion  development  in  AM  components,  which  is  an  important  element  in  achieving  rapid  qualification  and  certification  for  deploying  metal  AM  components  in  safety-critical  applications.
■590    ▼aSchool  code:  0127.
■650  4▼aEngineering
■650  4▼aNaval  engineering
■650  4▼aMechanical  engineering
■650  4▼aMaterials  science
■653    ▼aResidual  stress
■653    ▼aWelding
■653    ▼aAdditive  manufacturing
■653    ▼aReduced-order  modelling
■653    ▼aFinite  element
■653    ▼aFitness-for-service  assessment
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■690    ▼a0468
■690    ▼a0794
■71020▼aUniversity  of  Michigan▼bNaval  Architecture  &  Marine  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
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■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358091▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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