Article
Construction & Building Technology
Xi Luo, Mingchen Huo
Summary: Creep deformation and creep rupture are crucial for the safety of steels operating at high temperatures. A generalized creep constitutive model has been proposed to describe typical creep curve styles, using practical creep rate curves and the classical theta projection method. The model was verified using P92 and T92 steels, demonstrating its ability to represent and predict creep behaviors in a unified and smooth manner. Two creep-life calculation methods were established based on a creep damage model, considering or not considering creep deformation.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Liudas Mazeika, Renaldas Raisutis, Audrius Jankauskas, Regina Rekuviene, Reimondas Sliteris, Vykintas Samaitis, Channa Nageswaran, Marko Budimir
Summary: Failures of welded main steam pipes in power plants are often caused by cracks in the heat-affected zone (HAZ), specifically Type IV cracks. This paper presents a high sensitivity technique using focused ultrasound for detecting creep damage, which allows for identifying the internal characteristics of the metal structure through signal processing algorithms. The technique was validated on creep-damaged samples and verified with metallographic analysis, demonstrating its ability to detect early stage creep damage.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Engineering, Multidisciplinary
M. Jakubowska, A. Wrobel, W. Manaj, A. Sypien
Summary: This paper presents the results of structure and mechanical tests on the low-alloy steel 14MoV6-3, which exhibited internal damage after long-term creep service. Mechanical properties, such as tensile strength, yield strength, and brittle transition temperature, were tested according to standards for pressure equipment. It was observed that the strength properties decreased with increasing service time. Microscopic tests using SEM revealed that cavitation cracking was the cause of damage. The study of the microstructure was also conducted using the EBSD method, providing important parameters for analyzing structural changes in fatigue and creep processes.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Review
Materials Science, Multidisciplinary
Martin Detrois, Jeffrey A. A. Hawk, Paul D. D. Jablonski
Summary: This review summarizes the recent development of creep-resistant ferritic-martensitic steels, which are essential materials used in power plants operating at high temperatures. The findings suggest that CPJ-7 steel has superior creep properties at 650 degrees C compared to other alloys, and the refined design of JMP steel shows potential for operation at the same temperature. The review also discusses the influence of various alloy elements on microstructure and mechanical properties.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Jie-lin Li, Long-yin Zhu, Ke-ping Zhou, Hui Chen, Le Gao, Yun Lin, Yan-jun Shen
Summary: The study defines rock freeze-thaw and creep damage factors based on nuclear magnetic resonance porosity and volume strain, and establishes non-linear creep damage constitutive model and freeze-thaw rock equation. The continuous damage caused by freeze-thaw cycles weakens the rock viscoplasticity and reduces the long-term strength.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Review
Materials Science, Multidisciplinary
Raheeg Ragab, Jonathan Parker, Ming Li, Tao Liu, Andy Morris, Wei Sun
Summary: This review focuses on the creep ductility of high-temperature materials, with specific attention to creep strength enhanced ferritic (CSEF) steels. The currently available creep ductility-based constitutive models are reviewed, and their predictive capabilities under multi-axial stress states are examined. The limitations and challenges of using existing models are evaluated, and the need for improved creep ductility-based models for CSEF steels is addressed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Review
Engineering, Mechanical
Xiaoping Zhou, Xiaokang Pan, Filippo Berto
Summary: This paper reviews the advancement of rock creep damage mechanics, including mechanisms, research methods, and constitutive models. The importance of creep research is emphasized, and several future research directions are pointed out.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Review
Engineering, Mechanical
Mohsin Sattar, A. R. Othman, S. Kamaruddin, Maaz Akhtar, Rashid Khan
Summary: This study presents a review of five established models for creep prediction, analyzing their significance and limitations. It explains creep phenomenon and mechanism, and provides a historical overview of the models. Through case studies, the pros and cons of using the models are highlighted, and comparisons are made among them. This review paper serves as a reliable reference for the selection of creep prediction models.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Multidisciplinary
R. Ragab, J. Parker, M. Li, T. Liu, W. Sun
Summary: This paper focuses on the creep-damage modeling of a Grade 91 pressurized header to address in-service cracking in the weldments. A multi-axial creep damage model and accelerated creep tests were used to predict crack initiation and estimate creep failure life. The predicted damage distributions and cracking in the header were in good agreement with experimental observations.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Construction & Building Technology
Xin Lyu, Ke Yang, QinJie Liu, Qiang Fu, Juejing Fang
Summary: The study on early damage and post-damage creep behavior of cement stone specimens revealed that the modified Nishihara model with damage factors effectively characterizes the creep behavior after damage, and the 80% stress ratio serves as a threshold value for early damage. The study also showed significant differences in the impact of damage amount on later creep behavior below and above the damage threshold value.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mechanics
Yanyan Huang, Xiaowu Luo, Yucun Zhan, Yan Chen, Liping Yu, Wei Feng, Jiankun Xiong, Jianping Yang, Guijun Mao, Lin Yang, Fuheng Nie
Summary: This study investigates the creep rupture behavior and microstructure changes of dissimilar welded joints of two types of martensitic heat resistant steel: F92 and Co3W2. The results indicate that the fracture position and mode change from transgranular ductile fracture in parent F92 to intergranular brittle fracture in the fine grain heat affected zone near F92, with the decrease of applied stress. The study also reveals the microstructural degradation caused by creep, including the decrease in dislocation density, precipitates coarsening, formation of dislocation cells, microvoids, macroscopic secondary cracks, and changes in fracture surface morphology.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Geological
Cheng Lyu, Deng Xu, Jianfeng Liu, Yi Ren, Chao Liang, Chengxing Zhao
Summary: Understanding the long-term creep mechanical behavior of granite is crucial for evaluating nuclear waste repository safety. Extrapolating high stress creep test results of hard rock samples to lower stress levels is unreasonable. This study conducted a 1117-day uniaxial creep test on granite at lower axial stress levels (60 and 87 MPa) to understand its long-term time-dependent deformation characteristics. The results showed that granite's creep deformation at 60 MPa and 87 MPa accounted for only 21.7% and 36% of the total deformation, respectively, while salt rock had approximately 80% creep deformation, making it difficult to detect creep in hard rock. The steady creep rate of granite was 9.14 x 10(-12) s(-1), significantly slower than that of salt rock under low stress and short-term granite creep test. The research proposed a novel nonlinear creep-damage constitutive model based on fractional derivative theory and damage mechanics to describe the long-term brittle creep characteristics of granite. This study reveals the very long-term time-dependent deformation behavior of hard rock, which is important for assessing the long-term stability of nuclear waste repositories.
Article
Engineering, Mechanical
Gerosa Riccardo, Barbara Rivolta, Carlo Gorla, Franco Concli
Summary: The present experimental work investigated the isothermal low cycle fatigue resistance of two well-known tool steels, AISI H11 and AISI H13, at different temperatures. It was found that at 550 degrees C fatigue and oxidation are the main driving mechanisms, with multiple crack nucleation observed at high temperatures.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Nicolas Di Luozzo, Sandra Cabeza, Michel Boudard, Marcelo Fontana
Summary: Transient liquid phase bonding (TLPB) welding method delivers heat simultaneously to the entire joint, resulting in lower cooling rates and lower residual stress peak magnitudes. Numerical simulation through thermal and mechanical analysis can predict residual stresses in TLPB weldments.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Christian Oberg, Baohua Zhu, Stefan Jonsson
Summary: The austenitic ductile cast iron D5S was creep tested at high temperature, exhibiting different forms of creep damage and precipitation of carbides under various stresses. Additionally, dislocation substructures were formed during the creep process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Acoustics
Jerome Combaniere, Peter Cawley, Kevin McAughey, Jochen Giese
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2019)
Article
Materials Science, Characterization & Testing
Dheeraj Velicheti, Peter B. Nagy, Waled Hassan
NDT & E INTERNATIONAL
(2019)
Article
Engineering, Multidisciplinary
Joseph Corcoran, Peter B. Nagy
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2019)
Article
Acoustics
Yuan Liu, Anton Van Pamel, Peter B. Nagy, Peter Cawley
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2019)
Article
Materials Science, Characterization & Testing
Michael Siu Hey Leung, Joseph Corcoran, Peter B. Nagy
NDT & E INTERNATIONAL
(2019)
Article
Acoustics
Stefano Mariani, Sebastian Heinlein, Peter Cawley
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2020)
Article
Acoustics
Chien An Chua, Peter Cawley, Peter B. Nagy
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2019)
Article
Engineering, Electrical & Electronic
Joseph Corcoran, Catrin M. Davies, Peter Cawley, Peter B. Nagy
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2020)
Article
Engineering, Multidisciplinary
Stefano Mariani, Yuan Liu, Peter Cawley
Summary: The research shows that temperature compensation methods developed for guided wave inspection outperform traditional baseline selection and signal stretch methods in ultrasonic structural health monitoring systems. Additionally, changes in the back wall reflection ratio can be used to track variations in the reflection coefficient, enabling the detection of smaller defects.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Yuan Liu, Peter B. Nagy, Peter Cawley
Summary: This article presents a design procedure for structural health monitoring systems based on bulk wave ultrasonic sensors. The trade-off between volume coverage and sensitivity is discussed, and a methodology using signal-to-noise maps is introduced. Experimental results show that lower frequencies can achieve higher volume coverage, which is suitable for various specific application needs.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Stefano Mariani, Peter Cawley
Summary: By adjusting guided wave signals using the newly developed location-specific temperature compensation method or the widely used optimal baseline selection technique, the defect detection performance can be significantly improved, reliably detecting damages as small as 0.1% cross section loss.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Euan Craig Rodgers, Stefano Mariani, Peter Cawley
Summary: This paper presents a novel guided wave monitoring technique for the detection of axial cracking in piping. The technique uses circumferential waves and finite element analysis to effectively detect small defect reflections. Temperature compensation allows for long-term monitoring with high probability of detection and minimal false alarms.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Acoustics
Georgios Sarris, Stewart G. G. Haslinger, Peter Huthwaite, Peter B. B. Nagy, Michael J. S. Lowe
Summary: In this study, the phenomenon of Rayleigh wave attenuation due to surface roughness is investigated using finite element modeling. The results show good agreement between the finite element results and theory in different scattering regimes, and also extend the validity of the theory.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Proceedings Paper
Materials Science, Characterization & Testing
Dheeraj Velicheti, Peter B. Nagy, Waled Hassan
45TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOL 38
(2019)
Article
Materials Science, Characterization & Testing
Bin Ma, Qingzhao Kong, Yewei Ding, Lin Chen, Weihang Gao
Summary: This study proposes an end-to-end damage detection framework that integrates emphasized channel attention, propagation, and aggregation-time-delay neural network (ECAPA-TDNN) with percussion techniques. The framework effectively detects internal damage within timber structures and distinguishes between different sizes of damage.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Zhiyuan Zhao, Lishuai Liu, Wen Liu, Da Teng, Yanxun Xiang, Fu-Zhen Xuan
Summary: The total focusing method (TFM) is a standard technique in ultrasonic phased array imaging and plays a crucial role in industrial non-destructive testing (NDT). This paper presents an improved TFM approach by formulating its imaging principle as a Boolean matrix and establishing a discretized tensor-based model. By employing sparse regularization strategy and a non-negative constraint solution algorithm, the proposed approach demonstrates superior capabilities in defect characterization and noise suppression compared to the traditional TFM.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Dongsoo Lee, Jung-Doung Yu, Seokgyu Jeong, Geunwoo Park, Jong-Sub Lee
Summary: This study suggests a more accurate method for evaluating the integrity of drilled shafts using electromagnetic waves propagating through transmission lines. The experimental results show that the location and size of sound and defect segments can be more clearly identified with the use of connectors on the transmission line.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Lu-Nan Dai, Chen-Yin Ni, Kai-Ning Ying, Ling Yuan, Zhi Yang, Wei-Wei Kan, Zhong-Hua Shen
Summary: A laser ultrasonics based frequency domain synthetic aperture focusing technology has been developed for imaging internal horizontal hole defects in bimetallic composites with a diameter of approximately 1.0 mm. The results show that this technology can improve imaging quality and locating capability, with a low testing error.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Guillermo Cosarinsky, Jorge F. Cruza, Mario Munoz, Jorge Camacho
Summary: This study develops an ultrasound imaging method for industrial and structural components, which can automatically detect the surface and estimate the probe position and orientation. By fitting the parametric models based on measured surface echoes, the method achieves the measurement of surface echoes and estimation of probe position and orientation. Validation experiments show that this method can accurately detect defects in the component under different probe positions and orientations.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
L. Gahleitner, G. Thummerer, G. Mayr, G. Mayr, P. Burgholzer, U. Cakmak
Summary: This study presents a one-dimensional photothermal method using the virtual wave concept to estimate subsurface interface parameters and demonstrates its application in layered materials. Experimental results validate the accurate estimation of interfacial parameters for the analyzed samples.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Pengxiang Ji, Yiming Jiang, Ruobing Zhao, Jing Zou
Summary: Computed laminography (CL) is a non-destructive imaging technique for plate-like samples that has challenges in exact reconstruction. Fusion laminography (FL) combines Fourier information from CL and CT to achieve precise reconstruction, showing superiority in artifact removal and edge preservation, particularly for irregular sample structures.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Guangzhi Chen, Odile Abraham, Damien Pageot, Olivier Durand, Mathieu Chekroun, Vincent Tournat
Summary: This paper investigates the application of Nonlinear Coda Wave Interferometry (NCWI) method in evaluating the nonlinear interface areas in highly heterogeneous materials. An experimental protocol is proposed and validated through numerical simulation and experimental results. The findings demonstrate that NCWI can be used to quantitatively analyze the nonlinear interface effects in complex media.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Ronghua Xu, Raul Enrique Beltran-Gutierrez, Max Kaeding, Alexander Lange, Steffen Marx, Joern Ostermann
Summary: This study compares the signal response of four different couplant materials in acoustic emission analysis and ultrasonic testing, and analyzes their impact on the signal response of a piezoelectric sensor. The results indicate that acrylic adhesive pads and hot glue demonstrate more reliable signal transmission in certain frequency ranges, while honey and vaseline perform better in other frequency ranges. Acrylic adhesive pads and honey are considered the preferred couplant materials.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Yong-Ho Kim, Jung-Ryul Lee
Summary: An artificial intelligence system for phased-array ultrasonic testing (PAUT) was developed in this study using a newly configured training dataset and neural network. Three experiments were conducted to verify its performance, showing improved classification accuracy of signals and successful data evaluation, benefiting the PAUT experts.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Shaun Mcknight, S. Gareth Pierce, Ehsan Mohseni, Christopher Mackinnon, Charles Macleod, Tom 'Hare, Charalampos Loukas
Summary: This work proposes four synthetic data generation methods to address the issue of limited training data in Non-Destructive Ultrasonic Testing. Experimental results demonstrate that these methods significantly improve the classification performance of real experimental images.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Xintao Xu, Zhixuan Chang, Eryong Wu, Shiwei Wu, Jian Chen, Keji Yang, Haoran Jin
Summary: This paper proposes a novel nozzle-side inspection method based on the data fusion of multi-view plane wave imaging (PWI) for ultrasonic non-destructive testing of nozzle-to-pipe welds. Experiments demonstrate the capability of sensitivity mappings to optimize the inspection configuration and serve as filters to fuse multi-view images. The proposed method enables accurate defect characterization and detection of slag, cracks, and lack of penetration in nozzle specimens.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Kai Wang, Zechen Luo, Shuang Xu, Wenxin Lai, Ruiqi Guan, Qijian Liu, Menglong Liu, Jing Rao, Xinlin Qing
Summary: In this study, an analytical framework is proposed to interpret the formation of defect-induced LDR in multilayered structures. By analyzing the reflections of Lamb waves at defect boundaries and obtaining the phase shift of reflected waves, the relationship between LDR frequency components and defect size is determined. Experimental validations are performed to improve the precision of defect characterization using LDR.
NDT & E INTERNATIONAL
(2024)
Article
Materials Science, Characterization & Testing
Shijie Jin, Chengjun Di, Jiakai Su, Siqi Shi, Zhongbing Luo
Summary: This paper proposes a mirrored composite-mode total focusing method (CTFM) for the quantitative detection and profile characterization of priori unknown irregular planar defects. Multiple views and normalization are used to achieve accurate imaging results.
NDT & E INTERNATIONAL
(2024)
