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Design of Materials Tolerant to Dynamic Tensile Spall Failure
Design of Materials Tolerant to Dynamic Tensile Spall Failure
Design of Materials Tolerant to Dynamic Tensile Spall Failure

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자료유형  
 학위논문 서양
최종처리일시  
20260202105604
ISBN  
9798265407207
DDC  
540
저자명  
Frawley, Keara G.
서명/저자  
Design of Materials Tolerant to Dynamic Tensile Spall Failure
발행사항  
[Sl] : Georgia Institute of Technology, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
165 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Ramprasad, Rampi;Thadhani, Naresh.
학위논문주기  
Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
초록/해제  
요약Materials tolerant to dynamic tensile or "spall" failure are of interest for applications involving high-velocity impact and blast loading. Metals and polymers generally have favorable responses to such extreme conditions and are therefore useful materials in shock-absorbing applications, such as the automotive industry, body armor, or other protection and shielding devices. The complex stress states and high strain rates involved in events leading to spall failure are typically different from the conditions under which most material testing is conducted to determine mechanical properties. Hence, it has been difficult to predict how spall strength, i.e., resistance to dynamic tensile failure, relates with typical mechanical properties such as hardness, toughness, strength, and moduli. This work focuses on utilizing machine learning (ML) to determine the relationship between these key properties and spall strength, with the goal of developing predictive models and a better understanding of the spall response behavior of metals, alloys, and polymers.Various methods were utilized to generate databases of spall strengths and key properties of metals and polymers through literature surveys and experiments. Sources included peer-reviewed journal articles and gas gun plate-on-plate impact experiments. Data analytic methods, such as the Pearson correlation and the coefficient of determination, were used to correlate the properties to spall strength.The first main result of this work is a model that predicts the spall strength of metals and alloys. The study provides design guidelines for efficiently screening metals based on commonly available mechanical properties that most influence the spall strength values, minimizing reliance on intensive experimental procedures. Furthermore, the model has been extended to predict the spall strength values of a class of complex alloys for which there is limited data available: high entropy alloys (HEAs). The second main result is a database of the spall strengths of 23 unique polymers, either experimentally determined in this work or available in the literature. This database also includes the available mechanical and physical properties of the various polymers, and correlates those to predict the spall strength based on a physically-based energy balance model available in the literature. Additionally, an initial exploration using Molecular Dynamics (MD) calculations was conducted on a simple polymer, polyethylene, to evaluate how this computational approach might perform across a broader range of polymers. By learning more about the influence of material properties on the spall strengths of different classes of materials, we can better understand and predict the spall response of untested materials.
일반주제명  
Crystal structure
일반주제명  
Mechanical properties
일반주제명  
Polymers
일반주제명  
Polyethylene
일반주제명  
Titanium alloys
일반주제명  
Yield stress
일반주제명  
Aluminum
일반주제명  
Energy
일반주제명  
Deformation
일반주제명  
Materials science
일반주제명  
Mechanics
일반주제명  
Polymer chemistry
기타저자  
Georgia Institute of Technology.
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aFrawley,  Keara  G.
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■5021  ▼aThesis  (Ph.D.)--Georgia  Institute  of  Technology,  2024.
■520    ▼aMaterials  tolerant  to  dynamic  tensile  or  "spall"  failure  are  of  interest  for  applications  involving  high-velocity  impact  and  blast  loading.  Metals  and  polymers  generally  have  favorable  responses  to  such  extreme  conditions  and  are  therefore  useful  materials  in  shock-absorbing  applications,  such  as  the  automotive  industry,  body  armor,  or  other  protection  and  shielding  devices.  The  complex  stress  states  and  high  strain  rates  involved  in  events  leading  to  spall  failure  are  typically  different  from  the  conditions  under  which  most  material  testing  is  conducted  to  determine  mechanical  properties.  Hence,  it  has  been  difficult  to  predict  how  spall  strength,  i.e.,  resistance  to  dynamic  tensile  failure,  relates  with  typical  mechanical  properties  such  as  hardness,  toughness,  strength,  and  moduli.  This  work  focuses  on  utilizing  machine  learning  (ML)  to  determine  the  relationship  between  these  key  properties  and  spall  strength,  with  the  goal  of  developing  predictive  models  and  a  better  understanding  of  the  spall  response  behavior  of  metals,  alloys,  and  polymers.Various  methods  were  utilized  to  generate  databases  of  spall  strengths  and  key  properties  of  metals  and  polymers  through  literature  surveys  and  experiments.  Sources  included  peer-reviewed  journal  articles  and  gas  gun  plate-on-plate  impact  experiments.  Data  analytic  methods,  such  as  the  Pearson  correlation  and  the  coefficient  of  determination,  were  used  to  correlate  the  properties  to  spall  strength.The  first  main  result  of  this  work  is  a  model  that  predicts  the  spall  strength  of  metals  and  alloys.  The  study  provides  design  guidelines  for  efficiently  screening  metals  based  on  commonly  available  mechanical  properties  that  most  influence  the  spall  strength  values,  minimizing  reliance  on  intensive  experimental  procedures.  Furthermore,  the  model  has  been  extended  to  predict  the  spall  strength  values  of  a  class  of  complex  alloys  for  which  there  is  limited  data  available:  high  entropy  alloys  (HEAs).  The  second  main  result  is  a  database  of  the  spall  strengths  of  23  unique  polymers,  either  experimentally  determined  in  this  work  or  available  in  the  literature.  This  database  also  includes  the  available  mechanical  and  physical  properties  of  the  various  polymers,  and  correlates  those  to  predict  the  spall  strength  based  on  a  physically-based  energy  balance  model  available  in  the  literature.  Additionally,  an  initial  exploration  using  Molecular  Dynamics  (MD)  calculations  was  conducted  on  a  simple  polymer,  polyethylene,  to  evaluate  how  this  computational  approach  might  perform  across  a  broader  range  of  polymers.  By  learning  more  about  the  influence  of  material  properties  on  the  spall  strengths  of  different  classes  of  materials,  we  can  better  understand  and  predict  the  spall  response  of  untested  materials.
■590    ▼aSchool  code:  0078.
■650  4▼aCrystal  structure
■650  4▼aMechanical  properties
■650  4▼aPolymers
■650  4▼aPolyethylene
■650  4▼aTitanium  alloys
■650  4▼aYield  stress
■650  4▼aAluminum
■650  4▼aEnergy
■650  4▼aDeformation
■650  4▼aMaterials  science
■650  4▼aMechanics
■650  4▼aPolymer  chemistry
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■71020▼aGeorgia  Institute  of  Technology.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
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■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360679▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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