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Computational Modeling of Fracture Behavior of Rubber-Like Materials
Computational Modeling of Fracture Behavior of Rubber-Like Materials
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105625
- ISBN
- 9798265427885
- DDC
- 306
- 서명/저자
- Computational Modeling of Fracture Behavior of Rubber-Like Materials
- 발행사항
- [Sl] : Stanford University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 253 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Linder, Christian.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2024.
- 초록/해제
- 요약Rubber-like materials are an evergreen and ubiquitous class of materials renowned for their wideranging practical utility. Their exceptional properties, including remarkable stretchability, low modulus, and high toughness, render them indispensable across various engineering domains such as automotive, packaging, petroleum, and aviation industries. Moreover, they find extensive applications in emerging fields like stretchable electronics, soft robotics, and implantable sensors. Among them, certain materials like natural rubber stand out for their superior qualities compared to their counterparts. Numerous efforts have been made to elucidate the underlying mechanisms behind its exceptional properties, with strain-induced crystallization (SIC) emerging as a key phenomenon believed to enhance fracture resistance. Moreover, SIC is also observed in polymer melts during industrial processing, where it can be harnessed to tailor the properties of finished products. Therefore, understanding and modeling the behavior of these materials hold significant importance. Given that their toughness and stretchability are their hallmark advantages, comprehending their fracture behavior is essential for designing applications resilient to failure. However, due to the complexity of the phenomenon, there is a lack of studies focusing on this aspect. Hence, this thesis aims to fill this gap by focusing on computationally modeling the fracture behavior of rubber-like materials, with particular emphasis on those exhibiting strain-induced crystallization.To simplify the modeling of this complex phenomenon, we approach it systematically by dividing the problem into manageable parts and addressing them individually. Initially, we focus on modeling the effect of strain-crystallization in delaying fracture initiation. This is achieved by proposing an internal energy-based failure criterion that incorporates the energy required for crystallite distortion. However, to extend the model to predict fracture propagation, a robust multiscale fracture model becomes necessary. Therefore, we couple a multiscale polymer model for non-crystallizing rubbers with the phase field fracture approach, wherein we assume that macroscale damage is driven by the breaking of microscale molecular bonds. Nevertheless, like many existing models in the literature,this model also predicts isotropic network deformation at the microscale, which is not physically realistic and poses challenges in capturing crystal orientations. Consequently, we propose a novel framework to capture anisotropic network deformations at the microscale for non-crystallizing rubbers. Given the importance of capturing the incompressible behavior of rubber-like materials, we introduce a mixed formulation and enforce the constraint using the augmented Lagrangian method. Finally, combining the model capturing the effects of strain-crystallization on fracture initiation and the robust multiscale model developed earlier, we present a simple fracture model for straincrystallizing rubbers, while also accounting for the weak anisotropy resulting from the evolution of crystallites.All of these studies employ a microscale polymer chain model, which assumes that the chains are made up of a number of freely jointed elastic chain segments, thus enabling the consideration of both entropy and molecular bond distortions within the chains. The deformations occurring at the microscale level in these chains are then linked to the macroscale loading using an appropriate network model. Finally, the macroscale model is proposed by incorporating the effects from the chains, bulk and the other necessary quantities. To validate the effectiveness of these models, rigorous comparisons are conducted with experimental data, thus ensuring that the models accurately capture the behavior of rubber-like materials under various complex conditions, thereby enhancing their predictive capabilities and applicability in real-world scenarios.
- 일반주제명
- Families & family life
- 일반주제명
- Crystallization
- 일반주제명
- Rubber
- 일반주제명
- Social support
- 일반주제명
- Visualization
- 일반주제명
- Personality
- 일반주제명
- Social psychology
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798265427885
■035 ▼a(MiAaPQ)AAI32316548
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a306
■1001 ▼aArunachala, Prajwal Kammardi.
■24510▼aComputational Modeling of Fracture Behavior of Rubber-Like Materials
■260 ▼a[Sl]▼bStanford University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a253 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Linder, Christian.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2024.
■520 ▼aRubber-like materials are an evergreen and ubiquitous class of materials renowned for their wideranging practical utility. Their exceptional properties, including remarkable stretchability, low modulus, and high toughness, render them indispensable across various engineering domains such as automotive, packaging, petroleum, and aviation industries. Moreover, they find extensive applications in emerging fields like stretchable electronics, soft robotics, and implantable sensors. Among them, certain materials like natural rubber stand out for their superior qualities compared to their counterparts. Numerous efforts have been made to elucidate the underlying mechanisms behind its exceptional properties, with strain-induced crystallization (SIC) emerging as a key phenomenon believed to enhance fracture resistance. Moreover, SIC is also observed in polymer melts during industrial processing, where it can be harnessed to tailor the properties of finished products. Therefore, understanding and modeling the behavior of these materials hold significant importance. Given that their toughness and stretchability are their hallmark advantages, comprehending their fracture behavior is essential for designing applications resilient to failure. However, due to the complexity of the phenomenon, there is a lack of studies focusing on this aspect. Hence, this thesis aims to fill this gap by focusing on computationally modeling the fracture behavior of rubber-like materials, with particular emphasis on those exhibiting strain-induced crystallization.To simplify the modeling of this complex phenomenon, we approach it systematically by dividing the problem into manageable parts and addressing them individually. Initially, we focus on modeling the effect of strain-crystallization in delaying fracture initiation. This is achieved by proposing an internal energy-based failure criterion that incorporates the energy required for crystallite distortion. However, to extend the model to predict fracture propagation, a robust multiscale fracture model becomes necessary. Therefore, we couple a multiscale polymer model for non-crystallizing rubbers with the phase field fracture approach, wherein we assume that macroscale damage is driven by the breaking of microscale molecular bonds. Nevertheless, like many existing models in the literature,this model also predicts isotropic network deformation at the microscale, which is not physically realistic and poses challenges in capturing crystal orientations. Consequently, we propose a novel framework to capture anisotropic network deformations at the microscale for non-crystallizing rubbers. Given the importance of capturing the incompressible behavior of rubber-like materials, we introduce a mixed formulation and enforce the constraint using the augmented Lagrangian method. Finally, combining the model capturing the effects of strain-crystallization on fracture initiation and the robust multiscale model developed earlier, we present a simple fracture model for straincrystallizing rubbers, while also accounting for the weak anisotropy resulting from the evolution of crystallites.All of these studies employ a microscale polymer chain model, which assumes that the chains are made up of a number of freely jointed elastic chain segments, thus enabling the consideration of both entropy and molecular bond distortions within the chains. The deformations occurring at the microscale level in these chains are then linked to the macroscale loading using an appropriate network model. Finally, the macroscale model is proposed by incorporating the effects from the chains, bulk and the other necessary quantities. To validate the effectiveness of these models, rigorous comparisons are conducted with experimental data, thus ensuring that the models accurately capture the behavior of rubber-like materials under various complex conditions, thereby enhancing their predictive capabilities and applicability in real-world scenarios.
■590 ▼aSchool code: 0212.
■650 4▼aFamilies & family life
■650 4▼aCrystallization
■650 4▼aRubber
■650 4▼aSocial support
■650 4▼aVisualization
■650 4▼aPersonality
■650 4▼aIndividual & family studies
■650 4▼aSocial psychology
■690 ▼a0628
■690 ▼a0451
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360831▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


