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Jidong KANG, James A. GIANETTO, William R. TYSON
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 546-553 doi: 10.1007/s11465-018-0501-2
Fracture toughness measurement is an integral part of structural integrity assessment of pipelines. Traditionally, a single-edge-notched bend (SE(B)) specimen with a deep crack is recommended in many existing pipeline structural integrity assessment procedures. Such a test provides high constraint and therefore conservative fracture toughness results. However, for girth welds in service, defects are usually subjected to primarily tensile loading where the constraint is usually much lower than in the three-point bend case. Moreover, there is increasing use of strain-based design of pipelines that allows applied strains above yield. Low-constraint toughness tests represent more realistic loading conditions for girth weld defects, and the corresponding increased toughness can minimize unnecessary conservatism in assessments. In this review, we present recent developments in low-constraint fracture toughness testing, specifically using single-edge-notched tension specimens, SENT or SE(T). We focus our review on the test procedure development and automation, round-robin test results and some common concerns such as the effect of crack tip, crack size monitoring techniques, and testing at low temperatures. Examples are also given of the integration of fracture toughness data from SE(T) tests into structural integrity assessment.
关键词: fracture toughness constraint effect single-edge-notched tension test pipeline structural integrity assessment
Emerging challenges to structural integrity technology for high-temperature applications
TU Shantung
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 375-387 doi: 10.1007/s11465-007-0066-y
关键词: manufacture aviation industry conversion petrochemical temperature
Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 563-570 doi: 10.1007/s11465-018-0487-9
The thermal hydraulic (TH) behavior of coo-lant water is a key factor in the structural integrity assessments on reactor pressure vessels (RPVs) of pressurized water reactors (PWRs) under pressurized thermal shock (PTS) events, because the TH behavior may affect the loading conditions in the assessment. From the viewpoint of TH behavior, configuration of plant equipment and their dimensions, and operator action time considerably influence various parameters, such as the temperature and flow rate of coolant water and inner pressure. In this study, to investigate the influence of the operator action time on TH behavior during a PTS event, we developed an analysis model for a typical Japanese PWR plant, including the RPV and the main components of both primary and secondary systems, and performed TH analyses by using a system analysis code called RELAP5. We applied two different operator action times based on the Japanese and the United States (US) rules: Operators may act after 10 min (Japanese rules) and 30 min (the US rules) after the occurrence of PTS events. Based on the results of TH analysis with different operator action times, we also performed structural analyses for evaluating thermal-stress distributions in the RPV during PTS events as loading conditions in the structural integrity assessment. From the analysis results, it was clarified that differences in operator action times significantly affect TH behavior and loading conditions, as the Japanese rule may lead to lower stresses than that under the US rule because an earlier operator action caused lower pressure in the RPV.
关键词: structural integrity reactor pressure vessel pressurized thermal shock thermal hydraulic analysis pressurized water reactor weld residual stress
An Exploration of Surface Integrity Remanufacturing for Aeroengine Components
Qiao Xiang,Yong He,Ting-hong Hou
《工程管理前沿(英文)》 2016年 第3卷 第2期 页码 107-114 doi: 10.15302/J-FEM-2016025
关键词: aeroengine component surface integrity remanufacturing surface integrity remanufacturing
Local fracture properties and dissimilar weld integrity in nuclear power plants
Guozhen WANG, Haitao WANG, Fuzhen XUAN, Shantung TU, Changjun LIU
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 283-290 doi: 10.1007/s11465-013-0250-1
In this paper, the local fracture properties in a Alloy52M dissimilar metal welded joint (DMWJ) between A508 ferritic steel and 316 L stainless steel in nuclear power plants were investigated by using the single-edge notched bend (SENB) specimens, and their use in integrity assessment of DMWJ structures was analyzed. The results show that the local fracture resistance in the DMWJ is determined by local fracture mechanism, and which is mainly related to the microstructures and local strength mismatches of materials at the crack locations. The initial cracks always grow towards the materials with lower strength, and the crack path deviation is mainly controlled by the local strength mismatch. If the local fracture properties could not be used for cracks in the heat affected zones (HAZs), interface and near interface zones, the use of the fracture properties ( -resistance curves) of base metals or weld metals following present codes will unavoidably produce non-conservative (unsafe) or excessive conservative assessment results. In most cases, the assessment results will be potentially unsafe. Therefore, it is recommended to obtain and use local mechanical and fracture properties in the integrity assessment of DMWJs.
关键词: local fracture properties dissimilar metal welded joint integrity assessment strength mismatch crack growth path
How does the improved DB mode degrade the complex integrity of infrastructure mega-projects?
Jinwen ZHANG, Yumin QIU
《工程管理前沿(英文)》 2018年 第5卷 第1期 页码 40-51 doi: 10.15302/J-FEM-2018083
关键词: Hong Kong-Zhuhai-Macao Bridge project island-tunnel subproject complex integrity complexity degradation the general contracting mode of design-build the design-build consortium
Hanlong LIU, Xuanming DING
《结构与土木工程前沿(英文)》 2009年 第3卷 第2期 页码 240-240 doi: 10.1007/s11709-009-0100-8
Experimental study of surface integrity and fatigue life in the face milling of Inconel 718
Xiangyu WANG, Chuanzhen HUANG, Bin ZOU, Guoliang LIU, Hongtao ZHU, Jun WANG
《机械工程前沿(英文)》 2018年 第13卷 第2期 页码 243-250 doi: 10.1007/s11465-018-0479-9
The Inconel 718 alloy is widely used in the aerospace and power industries. The machining-induced surface integrity and fatigue life of this material are important factors for consideration due to high reliability and safety requirements. In this work, the milling of Inconel 718 was conducted at different cutting speeds and feed rates. Surface integrity and fatigue life were measured directly. The effects of cutting speed and feed rate on surface integrity and their further influences on fatigue life were analyzed. Within the chosen parameter range, the cutting speed barely affected the surface roughness, whereas the feed rate increased the surface roughness through the ideal residual height. The surface hardness increased as the cutting speed and feed rate increased. Tensile residual stress was observed on the machined surface, which showed improvement with the increasing feed rate. The cutting speed was not an influencing factor on fatigue life, but the feed rate affected fatigue life through the surface roughness. The high surface roughness resulting from the high feed rate could result in a high stress concentration factor and lead to a low fatigue life.
关键词: roughness hardness residual stress microstructure fatigue life
Approximation of structural damping and input excitation force
Mohammad SALAVATI
《结构与土木工程前沿(英文)》 2017年 第11卷 第2期 页码 244-254 doi: 10.1007/s11709-016-0371-9
关键词: structural modal parameters damping identification method input excitation force identification Inverse problem
Fiber-reinforced composites in milling and grinding: machining bottlenecks and advanced strategies
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0680-8
关键词: milling grinding fiber-reinforced composites damage formation mechanism delamination material removal mechanism surface integrity minimum quantity lubrication
is essential for the integrity of stereociliary rootlet in cochlear hair cells in mice
Yuqin Men, Xiujuan Li, Hailong Tu, Aizhen Zhang, Xiaolong Fu, Zhishuo Wang, Yecheng Jin, Congzhe Hou, Tingting Zhang, Sen Zhang, Yichen Zhou, Boqin Li, Jianfeng Li, Xiaoyang Sun, Haibo Wang, Jiangang Gao
《医学前沿(英文)》 2019年 第13卷 第6期 页码 690-704 doi: 10.1007/s11684-018-0638-8
关键词: TPRN stereocilia stereociliary rootlet actin filament CRISPR/Cas9 hearing
Effects of green roof damping and configuration on structural seismic response
《结构与土木工程前沿(英文)》 页码 1133-1144 doi: 10.1007/s11709-023-0959-9
关键词: green infrastructure green roof structural resilience seismic design
Xinqun ZHU, Hong HAO
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 321-333 doi: 10.1007/s11709-012-0161-y
关键词: integrated structural health monitoring operational conditions vibration and guided wave
Digital image correlation-based structural state detection through deep learning
《结构与土木工程前沿(英文)》 2022年 第16卷 第1期 页码 45-56 doi: 10.1007/s11709-021-0777-x
关键词: structural state detection deep learning digital image correlation vibration signal steel frame
Ali KARIMPOUR, Salam RAHMATALLA
《结构与土木工程前沿(英文)》 2020年 第14卷 第6期 页码 1331-1348 doi: 10.1007/s11709-020-0686-4
关键词: structural model validation eigenvalue problem response surface inverse problems
标题 作者 时间 类型 操作
Recent development in low-constraint fracture toughness testing for structural integrity assessment of
Jidong KANG, James A. GIANETTO, William R. TYSON
期刊论文
Emerging challenges to structural integrity technology for high-temperature applications
TU Shantung
期刊论文
evaluation of loading conditions during pressurized thermal shock transients based on thermal-hydraulics and structural
Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI
期刊论文
An Exploration of Surface Integrity Remanufacturing for Aeroengine Components
Qiao Xiang,Yong He,Ting-hong Hou
期刊论文
Local fracture properties and dissimilar weld integrity in nuclear power plants
Guozhen WANG, Haitao WANG, Fuzhen XUAN, Shantung TU, Changjun LIU
期刊论文
How does the improved DB mode degrade the complex integrity of infrastructure mega-projects?
Jinwen ZHANG, Yumin QIU
期刊论文
Propagation characteristics of transient waves in low-strain integrity testing on cast-in-situ concrete
Hanlong LIU, Xuanming DING
期刊论文
Experimental study of surface integrity and fatigue life in the face milling of Inconel 718
Xiangyu WANG, Chuanzhen HUANG, Bin ZOU, Guoliang LIU, Hongtao ZHU, Jun WANG
期刊论文
Fiber-reinforced composites in milling and grinding: machining bottlenecks and advanced strategies
期刊论文
is essential for the integrity of stereociliary rootlet in cochlear hair cells in mice
Yuqin Men, Xiujuan Li, Hailong Tu, Aizhen Zhang, Xiaolong Fu, Zhishuo Wang, Yecheng Jin, Congzhe Hou, Tingting Zhang, Sen Zhang, Yichen Zhou, Boqin Li, Jianfeng Li, Xiaoyang Sun, Haibo Wang, Jiangang Gao
期刊论文
Development of an integrated structural health monitoring system for bridge structures in operational
Xinqun ZHU, Hong HAO
期刊论文