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Multiscale Modeling with Meshfree Methods- [electronic resource]
Multiscale Modeling with Meshfree Methods - [electronic resource]
Multiscale Modeling with Meshfree Methods- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101921
ISBN  
9798380622196
DDC  
519
저자명  
Xu, Wentao.
서명/저자  
Multiscale Modeling with Meshfree Methods - [electronic resource]
발행사항  
[S.l.]: : Columbia University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(162 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
주기사항  
Advisor: Fish, Jacob;Spiegelman, Marc.
학위논문주기  
Thesis (Ph.D.)--Columbia University, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Multiscale modeling has become an important tool in material mechanics because material behavior can exhibit varied properties across different length scales. The use of multiscale modeling is essential for accurately capturing these characteristics and predicting material behavior. Mesh-free methods have also been gaining attention in recent years due to their innate ability to handle complex geometries and large deformations. These methods provide greater flexibility and efficiency in modeling complex material behavior, especially for problems involving discontinuities, such as fractures and cracks. Moreover, mesh-free methods can be easily extended to multiple lengths and time scales, making them particularly suitable for multiscale modeling.The thesis focuses on two specific problems of multiscale modeling with mesh-free methods. The first problem is the atomistically informed constitutive model for the study of high-pressure induced densification of silica glass. Molecular Dynamics (MD) simulations are carried out to study the atomistic level responses of fused silica under different pressure and strain-rate levels, Based on the data obtained from the MD simulations, a novel continuum-based multiplicative hyper-elasto-plasticity model that accounts for the anomalous densification behavior is developed and then parameterized using polynomial regression and deep learning techniques. To incorporate dynamic damage evolution, a plasticity-damage variable that controls the shrinkage of the yield surface is introduced and integrated into the elasto-plasticity model. The resulting coupled elasto-plasticity-damage model is reformulated to a non-ordinary state-based peridynamics (NOSB-PD) model for the computational efficiency of impact simulations. The developed peridynamics (PD) model reproduces coarse-scale quantities of interest found in MD simulations and can simulate at a component level. Finally, the proposed atomistically-informed multiplicative hyper-elasto-plasticity-damage model has been validated against limited available experimental results for the simulation of hyper-velocity impact simulation of projectiles on silica glass targets.The second problem addressed in the thesis involves the upscaling approach for multi-porosity media, analyzed using the so-called MultiSPH method, which is a sequential SPH (Smoothed Particle Hydrodynamics) solver across multiple scales. Multi-porosity media is commonly found in natural and industrial materials, and their behavior is not easily captured with traditional numerical methods. The upscaling approach presented in the thesis is demonstrated on a porous medium consisting of three scales, it involves using SPH methods to characterize the behavior of individual pores at the microscopic scale and then using a homogenization technique to upscale to the meso and macroscopic level. The accuracy of the MultiSPH approach is confirmed by comparing the results with analytical solutions for simple microstructures, as well as detailed single-scale SPH simulations and experimental data for more complex microstructures.
일반주제명  
Applied mathematics.
일반주제명  
Mechanics.
일반주제명  
Computer science.
키워드  
Asymptotic expansion
키워드  
Constitutive modeling
키워드  
Mesh-free methods
키워드  
Molecular dynamics
키워드  
Multiscale modeling
키워드  
Peridynamics
기타저자  
Columbia University Applied Mathematics
기본자료저록  
Dissertations Abstracts International. 85-04B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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 008240612s2023      us  |||||||||||||||c||eng  d
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■00520240214101921
■006m          o    d                
■007cr#unu||||||||
■020    ▼a9798380622196
■035    ▼a(MiAaPQ)AAI30690516
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a519
■1001  ▼aXu,  Wentao.
■24510▼aMultiscale  Modeling  with  Meshfree  Methods▼h[electronic  resource]
■260    ▼a[S.l.]:▼bColumbia  University.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(162  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-04,  Section:  B.
■500    ▼aAdvisor:  Fish,  Jacob;Spiegelman,  Marc.
■5021  ▼aThesis  (Ph.D.)--Columbia  University,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aMultiscale  modeling  has  become  an  important  tool  in  material  mechanics  because  material  behavior  can  exhibit  varied  properties  across  different  length  scales.  The  use  of  multiscale  modeling  is  essential  for  accurately  capturing  these  characteristics  and  predicting  material  behavior.  Mesh-free  methods  have  also  been  gaining  attention  in  recent  years  due  to  their  innate  ability  to  handle  complex  geometries  and  large  deformations.  These  methods  provide  greater  flexibility  and  efficiency  in  modeling  complex  material  behavior,  especially  for  problems  involving  discontinuities,  such  as  fractures  and  cracks.  Moreover,  mesh-free  methods  can  be  easily  extended  to  multiple  lengths  and  time  scales,  making  them  particularly  suitable  for  multiscale  modeling.The  thesis  focuses  on  two  specific  problems  of  multiscale  modeling  with  mesh-free  methods.  The  first  problem  is  the  atomistically  informed  constitutive  model  for  the  study  of  high-pressure  induced  densification  of  silica  glass.  Molecular  Dynamics  (MD)  simulations  are  carried  out  to  study  the  atomistic  level  responses  of  fused  silica  under  different  pressure  and  strain-rate  levels,  Based  on  the  data  obtained  from  the  MD  simulations,  a  novel  continuum-based  multiplicative  hyper-elasto-plasticity  model  that  accounts  for  the  anomalous  densification  behavior  is  developed  and  then  parameterized  using  polynomial  regression  and  deep  learning  techniques.  To  incorporate  dynamic  damage  evolution,  a  plasticity-damage  variable  that  controls  the  shrinkage  of  the  yield  surface  is  introduced  and  integrated  into  the  elasto-plasticity  model.  The  resulting  coupled  elasto-plasticity-damage  model  is  reformulated  to  a  non-ordinary  state-based  peridynamics  (NOSB-PD)  model  for  the  computational  efficiency  of  impact  simulations.  The  developed  peridynamics  (PD)  model  reproduces  coarse-scale  quantities  of  interest  found  in  MD  simulations  and  can  simulate  at  a  component  level.  Finally,  the  proposed  atomistically-informed  multiplicative  hyper-elasto-plasticity-damage  model  has  been  validated  against  limited  available  experimental  results  for  the  simulation  of  hyper-velocity  impact  simulation  of  projectiles  on  silica  glass  targets.The  second  problem  addressed  in  the  thesis  involves  the  upscaling  approach  for  multi-porosity  media,  analyzed  using  the  so-called  MultiSPH  method,  which  is  a  sequential  SPH  (Smoothed  Particle  Hydrodynamics)  solver  across  multiple  scales.  Multi-porosity  media  is  commonly  found  in  natural  and  industrial  materials,  and  their  behavior  is  not  easily  captured  with  traditional  numerical  methods.  The  upscaling  approach  presented  in  the  thesis  is  demonstrated  on  a  porous  medium  consisting  of  three  scales,  it  involves  using  SPH  methods  to  characterize  the  behavior  of  individual  pores  at  the  microscopic  scale  and  then  using  a  homogenization  technique  to  upscale  to  the  meso  and  macroscopic  level.  The  accuracy  of  the  MultiSPH  approach  is  confirmed  by  comparing  the  results  with  analytical  solutions  for  simple  microstructures,  as  well  as  detailed  single-scale  SPH  simulations  and  experimental  data  for  more  complex  microstructures.
■590    ▼aSchool  code:  0054.
■650  4▼aApplied  mathematics.
■650  4▼aMechanics.
■650  4▼aComputer  science.
■653    ▼aAsymptotic  expansion
■653    ▼aConstitutive  modeling
■653    ▼aMesh-free  methods
■653    ▼aMolecular  dynamics
■653    ▼aMultiscale  modeling
■653    ▼aPeridynamics
■690    ▼a0364
■690    ▼a0346
■690    ▼a0984
■71020▼aColumbia  University▼bApplied  Mathematics.
■7730  ▼tDissertations  Abstracts  International▼g85-04B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0054
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16935346▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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