Article
Engineering, Multidisciplinary
Peixiang Sun, Haidong Jia, Jiaming Chen, Xueda Li, Bin Han
Summary: In this study, a strain concentration characterization method is proposed for variable wall thickness joints. A finite element model is established to evaluate different factors such as misalignment, weld strength matching, pipes strength configuration, and heat affected zone (HAZ) softening on root strain concentration. It is found that misalignment is the main factor causing strain concentration, while larger misalignment, lower weld strength matching, and higher pipe strength lead to higher strain concentration. However, a high strain concentration can induce material damage and provide conditions for crack initiation and propagation in the root.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Multidisciplinary
Kyung-Dong Bae, Yun-Jae Kim, Seung-Jae Kim, Ho-Wan Ryu, Young-Jin Oh
Summary: This paper proposes the concept of an equivalent through-wall cracked pipe for evaluating the maximum bending load of a complex cracked pipe. The equivalent pipe has the same outer radius and through-wall crack length as the complex cracked pipe, with only the equivalent pipe thickness being variable. A systematic FE damage analysis shows that the equivalent pipe thickness is linearly dependent on the relative surface crack depth of the complex crack, regardless of materials. Elastic-plastic fracture mechanics analysis using the proposed concept demonstrates good agreement between predicted maximum loads and experimental data for existing complex cracked pipe tests, indicating that existing fracture mechanics methods for through-wall cracked pipes can be used to determine the maximum bending load of a complex cracked pipe.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Civil
Wenying Zhang, Xiangzhi Xu, Yang Liu, Cheng Yu, Xuechun Liu, Zhiqiang Xie
Summary: The North American specifications provide tabulated values and equations for designing cold-formed steel framed shear walls with steel sheet sheathing. Research has shown that increasing the thickness and screw density can enhance the shear strength of high-strength CFS framed shear walls.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Environmental
Xiaoshu Yan, Tao Lin, Xiaoxiang Wang, Shisheng Zhang, Kemei Zhou
Summary: This study investigates the contributions of biofilms to disinfection byproduct formation in engineered water systems. The biofilms on different types of water supply pipes show significant differences in growth, morphology, organic components, and bacterial diversity. The extracellular polymeric substance secreted by the biofilm plays a crucial role in disinfection byproduct formation. Nitrogenous disinfection byproducts demonstrate higher toxicity potentials in the biofilms compared to carbonaceous disinfection byproducts.
Article
Engineering, Civil
He-Gao Wu, Jin-Hong Yu, Chang-Zheng Shi, Zhu Ma
Summary: This paper presents a comprehensive numerical investigation on the interaction between large-diameter buried steel pipes and soil, showing that pipe deformation and soil pressure are significantly influenced by factors such as pipe diameter, water weight, and internal water pressure. The results also indicate that the elastic modulus and friction coefficients of the backfill have strong effects on pipe deformation and soil pressure.
KSCE JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Dong Zhang, Xiaoben Liu, Yue Yang, Pengchao Chen, Han Zhang, Xiaobin Hou, Hong Zhang
Summary: This study conducts tensile experiments and analysis on specimens with unequal wall thickness across welding seam using digital image correlation technology, and investigates the influence of transition length and form on fracture behavior of welded joints of unequal wall thickness pipelines. Additionally, a three-dimensional finite element model of welded joints with oblique line and circular arc transitions is established, and its accuracy is verified. The research results provide guidance for the design and safety evaluation of welded joints with unequal wall thickness.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2023)
Article
Polymer Science
Tangqing Kuang, Jiamin Wang, Hesheng Liu, Zhihuan Yuan
Summary: Gas-Projectile-Assisted Injection Molding (G-PAIM) is a new injection molding process that improves upon the Gas-Assisted Injection Molding (GAIM) process by introducing a projectile. The study compared and investigated the short-shot and overflow methods of both G-PAIM and GAIM processes in terms of pipe wall thickness and uniformity. The results showed that the G-PAIM molded pipe had thinner and more uniform wall thickness compared to the GAIM molded pipe, and the wall thickness of the G-PAIM-O molded pipe was the most uniform. The study also found that the gas injection delay time and gas injection pressure had significant effects on the wall thickness of the G-PAIM-O pipes.
Article
Materials Science, Characterization & Testing
Samuel Yu, Winnie Wai-sze Chung, Tom Chun-wai Lau, Wallace Wai-lok Lai, Janet Fung Chu Sham, Chun Yiu Ho
Summary: This study investigated the problem of external pipewall thinning in steel pipes caused by external corrosion in hostile underground environment using active infrared thermography. A model system was prepared to imitate the underground environment and wall thinning was studied by capturing thermograms inside the pipe. The study developed a rapid approach in classifying defect's residual thickness by utilizing two parameters - defect's peak thermal contrast and estimated area from infrared images.
NDT & E INTERNATIONAL
(2023)
Article
Engineering, Multidisciplinary
Hong Quang Pham, Trung Kien Nguyen, Quang Ngan Pham, Van Sy Le, Minh Hung Vu, Thi Thuy Truong, Chau Vi Khang Ngo, CheolGi Kim, Sidina Wane, Azzedine Bousseksou, Ferial Terki, Quang Hung Tran
Summary: The magnetic flux density method is suitable for monitoring wall thinning in pipes. However, quantifying gradual reduction is challenging due to the small signal being hindered by noise in magnetic field measurements. This study presents a high-precision instrument for accurately measuring small thickness reductions. By optimizing the size of the magnetizer and using an ultrahigh-sensitivity magnetometer, reliable and reproducible measurements can be achieved.
Article
Mechanics
Deao Kong, Ping Zhou, Chenggao Li, Bin Hong, Guijun Xian
Summary: This study quantitatively investigated the effects of pipe and crack geometry, CFRP properties, and prestress levels on the Mode I stress intensity factor (SIF) of a prestressed CFRP-wrapped steel pipe with a through-walled crack through dimensional and finite element analysis. The results showed that the SIF was affected by the radius and wall thickness of the pipe, as well as the stiffness of the CFRP and the level of prestress. An empirical equation for calculating the Mode I SIF in the CFRP-wrapped thin-walled pipe with a through-walled crack was proposed, along with a mechanical method to calculate the decrement of pipe substrate bearing internal pressure caused by prestress.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Marine
Ruilin Xia, Chen Jia, Changyong Liu, Puyuan Liu, Sumei Zhang
Summary: This study investigates the corrosion characteristics of steel pipe piles in the East China Sea. The results show that the remaining thickness and roughness of the piles exhibit non-uniform features. The piles experience double-sided corrosion in the splash and tidal zones, while only one-sided corrosion on the outer surface in the immersion zone. The splash zone shows the most severe corrosion damage. Additionally, the extreme value analysis indicates that the minimal values of the remaining thickness follow a generalized extreme value distribution.
Article
Nuclear Science & Technology
Delin Rao, Bo Kuang, Xian Zhang, Shuyan Zhang
Summary: Through the single-phase flow accelerated corrosion (FAC) test loop, it was found that A335P11 steel may be one of the preferred pipe materials for the CAP1400 nuclear power plant secondary loop, with a lower wall thinning rate compared to 20# steel elbow.
ANNALS OF NUCLEAR ENERGY
(2021)
Article
Engineering, Manufacturing
Hardik D. Vyas, Kush P. Mehta, Vishvesh Badheka, Bharat Doshi
Summary: The study found that dissimilar friction welding between ETP-Cu and SS of grade 304 L can produce strong joints with excellent leak-proof ability and strength, with noticeable microstructure changes on the Cu side but not on the SS side. The continuity of welding was observed at the periphery of the pipe configuration with the presence of a continuous reaction layer containing Cu and Fe elements at the joint interface.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Computer Science, Interdisciplinary Applications
Mansour Bagheri, Shun-Peng Zhu, Mohamed El Amine Ben Seghier, Behrooz Keshtegar, Nguyen-Thoi Trung
Summary: This study presents an iterative bi-loop framework for fuzzy reliability analysis of corroded pipelines to evaluate various fuzzy-random variables.Fuzzy reliability index calculations are found to be significantly influenced by corrosion defect depth and operating pressure, indicating the importance of considering these factors in reliability analysis.
ENGINEERING WITH COMPUTERS
(2021)
Article
Engineering, Civil
Cancan Yang, Yu-Chen Chou, Chung-Chan Hung
Summary: This research investigates the benefits and limitations of using high-strength steel in wall piers through experimental investigation. The results show that a 50% reduction in high-strength steel reinforcement has minor influence on the failure mode and lateral load-resisting capability of wall piers, but it affects the flexure-shear interaction and ultimate load resisting mechanism.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
Maciej Witek
ENGINEERING FAILURE ANALYSIS
(2016)
Article
Engineering, Multidisciplinary
Lukasz Mazurkiewicz, Michal Tomaszewski, Jerzy Malachowski, Kamil Sybilski, Mikhail Chebakov, Maciej Witek, Peter Yukhymets, Roman Dmitrienko
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2017)
Article
Engineering, Civil
Maciej Witek, Anatolii Batura, Igor Orynyak, Mykhailo Borodii
ENGINEERING STRUCTURES
(2018)
Article
Energy & Fuels
Maciej Witek
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2018)
Article
Engineering, Mechanical
Maciej Witek
ENGINEERING FAILURE ANALYSIS
(2019)
Article
Chemistry, Physical
Maciej Witek
Summary: This study evaluates the burst pressure and structural integrity of a steel pipeline based on in-line inspection results, focusing on grouping criteria of closely spaced defects and their impact on pipeline strength. Results show that groups of closely-spaced defects behave similarly to individual flaws in terms of burst pressure and pipeline failure probability.
Article
Energy & Fuels
M. Witek, F. E. Uilhoorn
Summary: This paper investigates the impact of failure of key elements in transmission networks on the security of natural gas delivery. A framework combining probabilistic integrity studies and hydraulic analysis is proposed. The introduction of a volumetric loss factor quantifies the effect of network failure, while the estimation of rupture probability and fine-tuning of the flow model enhance the evaluation of the system's gas delivery capacity to customer nodes.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Mechri Abdelghani, Ghomari Tewfik, Maciej Witek, Djouadi Djahida
Summary: This paper presents an accurate description of stress distribution and stress concentration determination around a spherical cavity embedded in a cylinder under internal pressure only. By combining different methods and formulating new analytical relations, the study finds that stress concentration factors are not constant and vary with factors such as cavity depth and Poisson ratio, regardless of the geometry of the cylinder.
Article
Chemistry, Physical
Djouadi Djahida, Ghomari Tewfik, Maciej Witek, Mechri Abdelghani
Summary: This paper presents a new calculation procedure for determining the effective thickness of composite repairs for corroded pipelines, which aims to avoid overestimation or underestimation. Finite element analysis was used to validate the results, showing that the proposed solution effectively reduces the thickness of the sleeve compared to current industrial standards.
Article
Thermodynamics
Maciej Witek, Ferdinand Uilhoorn
Summary: This paper examines the impact of hydrogen blended natural gas on linepack energy under emergency pipeline operation scenarios, providing valuable insights for pipeline operators to assess supply security.
ARCHIVES OF THERMODYNAMICS
(2022)
Article
Thermodynamics
Maciej Witek, Ferdinand Uilhoorn
ARCHIVES OF THERMODYNAMICS
(2020)
