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Anisotropic Deformation Mechanisms of Stress Relaxation in Zircaloy-4 Cladding From Pellet-Cladding Interactions
Anisotropic Deformation Mechanisms of Stress Relaxation in Zircaloy-4 Cladding From Pellet-Cladding Interactions
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152736
- ISBN
- 9798384455646
- DDC
- 539.76
- 저자명
- Nelson, Malachi.
- 서명/저자
- Anisotropic Deformation Mechanisms of Stress Relaxation in Zircaloy-4 Cladding From Pellet-Cladding Interactions
- 발행사항
- [Sl] : University of California, Berkeley, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 142 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Hosemann, Peter.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Berkeley, 2024.
- 초록/해제
- 요약Increases to reactor power cause fuel pellet thermal expansion which can impose strain generating high stresses in the cladding and potentially lead to a breach in the fuel system. This phenomenon is known as a pellet-cladding interaction and the stress accumulation and retention during such an event is highly relevant to the fuel performance. This dissertation investigates the anisotropic deformation mechanisms controlling mechanical behavior of cold-worked stress-relieved Zircaloy-4 under pellet-cladding interaction conditions through mechanical testing, microstructure characterization, and stress analysis. Two loading modes are used to compare the effects of different stress states. These include axial tension which is commonly used to measure the mechanical properties, and internal pressurization loading which better simulates pellet-cladding loading conditions. It is hypothesized that the cladding subjected to internal pressure loaded will display enhanced stress relaxation due to increased stress and defect accumulation during loading and more competitive slip system activity during relaxation. Results confirm these hypotheses and find that the rate-limiting deformation mechanism during relaxation is screw dislocation glide on prismatic planes limited by edge dislocation jog and dipole climbing on basal planes. Differences in stress and defect accumulation are observed and do affect the stress relaxation behavior, but the dissertation finds that the primary reason for enhanced relaxation is because internal pressure loading imposes higher resolved shear stresses on basal slip systems which accelerates the rate-limiting deformation mechanism.
- 일반주제명
- Nuclear engineering
- 일반주제명
- Energy
- 일반주제명
- Materials science
- 일반주제명
- Engineering
- 키워드
- Anisotropy
- 키워드
- Zircaloy
- 기타저자
- University of California, Berkeley Nuclear Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798384455646
■035 ▼a(MiAaPQ)AAI31491385
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a539.76
■1001 ▼aNelson, Malachi.
■24510▼aAnisotropic Deformation Mechanisms of Stress Relaxation in Zircaloy-4 Cladding From Pellet-Cladding Interactions
■260 ▼a[Sl]▼bUniversity of California, Berkeley▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a142 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Hosemann, Peter.
■5021 ▼aThesis (Ph.D.)--University of California, Berkeley, 2024.
■520 ▼aIncreases to reactor power cause fuel pellet thermal expansion which can impose strain generating high stresses in the cladding and potentially lead to a breach in the fuel system. This phenomenon is known as a pellet-cladding interaction and the stress accumulation and retention during such an event is highly relevant to the fuel performance. This dissertation investigates the anisotropic deformation mechanisms controlling mechanical behavior of cold-worked stress-relieved Zircaloy-4 under pellet-cladding interaction conditions through mechanical testing, microstructure characterization, and stress analysis. Two loading modes are used to compare the effects of different stress states. These include axial tension which is commonly used to measure the mechanical properties, and internal pressurization loading which better simulates pellet-cladding loading conditions. It is hypothesized that the cladding subjected to internal pressure loaded will display enhanced stress relaxation due to increased stress and defect accumulation during loading and more competitive slip system activity during relaxation. Results confirm these hypotheses and find that the rate-limiting deformation mechanism during relaxation is screw dislocation glide on prismatic planes limited by edge dislocation jog and dipole climbing on basal planes. Differences in stress and defect accumulation are observed and do affect the stress relaxation behavior, but the dissertation finds that the primary reason for enhanced relaxation is because internal pressure loading imposes higher resolved shear stresses on basal slip systems which accelerates the rate-limiting deformation mechanism.
■590 ▼aSchool code: 0028.
■650 4▼aNuclear engineering
■650 4▼aEnergy
■650 4▼aMaterials science
■650 4▼aEngineering
■653 ▼aAnisotropy
■653 ▼aMechanical testing
■653 ▼aMicrostructure characterization
■653 ▼aPellet-cladding interaction
■653 ▼aStress relaxation
■653 ▼aZircaloy
■690 ▼a0552
■690 ▼a0794
■690 ▼a0791
■690 ▼a0537
■71020▼aUniversity of California, Berkeley▼bNuclear Engineering.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0028
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163653▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
