Article
Mechanics
Yangyang Yin, Shaowei Hu, Chaofeng Liang, Yueyang Sun
Summary: Expressions of crack extension resistance for a general three-point bending concrete specimen were developed. The effects of span/height ratios on fracture processes were studied using two types of specimens. Results showed that crack extension resistance curves increased with crack propagation, and were not affected by span/height ratios. The calculated crack tip opening displacement was not affected by specimen span but increased with specimen height. Stability analysis of crack propagation was also described based on the crack extension resistance curves.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Mohammod Minhajur Rahman, Xudong Zhao, Tommaso D'Antino, Francesco Focacci, Christian Carloni
Summary: This study presents three-point bending fracture tests on glass fiber-reinforced polymer (GFRP) reinforced concrete notched beams, and compares them with plain concrete specimens. The results can help understand the fracture behavior of this type of specimens and provide parameters for analysis.
Article
Engineering, Civil
Jingwu Bu, Xudong Chen, Shengshan Guo, Jinhua Zhang
Summary: Three-point bending tests were conducted on notched concrete beams under various cyclic loading regimes, with digital image correlation (DIC) method used to monitor crack propagation. The study found that fatigue fracture life decreases with increasing loading levels, while residual crack mouth opening displacement (CMOD) accumulates and fracture stiffness degrades with the loading process. The length of fracture process zone (FPZ) and effective crack length were linearly related before the critical crack tip opening displacement (CTOD) value is exceeded. Furthermore, the length of FPZ and effective crack length showed different behaviors under cyclic envelope loading compared to constant-amplitude loading, with discrepancies between values calculated by two-parameter model (TPM) and DIC methods.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Junwei Liu, Humaira Kanwal, Can Tang, Wenfeng Hao
Summary: This study focused on the mechanical properties of 3D printed lattice-reinforced concrete and compared different lattice structures. The results showed that lattice could significantly improve the mechanical properties of concrete, with the rhombicuboctahedron (RO) lattice being the most effective in enhancing the bearing capacity of concrete specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mechanics
Luis M. P. Matos, Joaquim A. O. Barros, Antonio Ventura-Gouveia, Rui A. B. Calcada
Summary: This paper presents the development of a new inverse analysis approach to derive fracture parameters of fibre reinforced concrete using experimental data. The approach is based on a global fitting strategy and relies on a bounded multi-variable nonlinear least squares fitting algorithm. The performance and predictive potential of the proposed approach are assessed using experimental results from literature.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Huiheng Lian, Xinjian Sun, Zhenpeng Yu, Yaojie Lian, Lei Xie, Anxiong Long, Zhixuan Guan
Summary: The fracture properties of concrete are significantly influenced by size effect and strain rate effect. Parameters such as fracture load, fracture energy, and crack initiation toughness show variations with changes in strain rate and span to height ratio. The rapid crack propagation period and strain rate effect tend to weaken with increasing span to height ratio.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Yun-Qiao Deng, Yuner Huang, Ben Young
Summary: This paper investigates the behavior of concrete-filled high strength steel tubular (CFHSST) beams through experimental tests. The results show that filling high strength steel tubes with concrete significantly improves their moment capacity and ductility. The suitability of current design provisions for CFHSST sections subjected to bending is also evaluated.
THIN-WALLED STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Yasir M. Alharthi, Ibrahim A. Sharaky, Ahmed S. Elamary, Abdulaziz Al-Sharef, Abdulrahman Al-Salmi, Abdulaziz Al-Sufyani, Omar Al-Osaimi, Ali Al-Mufti
Summary: An experimental investigation was conducted to study the behavior of composite-reinforced concrete/steel beams under flexure. The study focused on the effect of shear connectors on crack propagation and widening along the slab. The results showed that the shape of the shear connectors was the key factor influencing the performance of the concrete part.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Mechanics
Yangyang Yin, Shaowei Hu, Jijian Lian, Run Liu
Summary: The fracture properties of concrete subjected to drying-wetting cycles in different types of sulfate solutions were investigated using experimental and analytical methods. The results show that the fracture toughness of concrete initially increases and then decreases with corrosion time, and the length of the fracture process zone (FPZ) increases linearly with crack propagation and gradually decreases. The DIC technique is proven to be effective in identifying fracture path and determining the evolution of the FPZ with high accuracy.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Aijun Li, Zijiang Yang, Shizhong Liu, Yanhai Liu, Heng Liu
Summary: The purpose of this study is to investigate the flexural fatigue properties of reinforced ultra-high performance concrete (RUHPC) T-beams, and composite T-beams of normal-strength concrete-RUHPC (NC-RUHPC) and damaged reinforced concrete (RC) strengthened with RUHPC (RC-RUHPC) under constant-amplitude low-cycle fatigue tests. The test results show that one main crack is only formed near the midspan in the later stage of fatigue loading, other bending cracks are micro-cracks, and their propagation is slow and short. The fatigue fracture of steel bars embedded in tested beams occurs after more than 3.7 million cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Construction & Building Technology
Hongniao Chen, Dengkai Liu
Summary: This study investigated the fracture and damage characteristics of high-strength concrete using cyclic loading and digital image correlation technique. The experimental results showed that the bearing capacity, deformation performance, and fracture energy of HSC were not affected by the loading and unloading process. Under cyclic loading, the residual crack mouth opening increased as the crack mouth opening displacement increased, while the load degradation rate decreased.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Mechanical
Dechun Lu, Zhiqiang Song, Guosheng Wang, Xiuli Du
Summary: A numerical model of a three-point bending concrete beam with an initial crack is established using the viscoelastic peridynamic method. The model's accuracy and rationality are verified by comparing the fracture modes calculated by this model with experimental results. The paper analyzes the angle of crack propagation and the evolution of energy, displacement, strain, and strain rate in the beam using the verified numerical model. The coupling influence law of the initial crack and loading velocity on the fracture mode of the beam is obtained based on 24 numerical examples with different initial crack positions and loading velocities.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Civil
Yuanlong Yang, Wentao Liang, Qingjie Yang, Yu Cheng
Summary: This paper discussed a new web-embedded steel-concrete composite beam (WTSCB), which eliminates the need for shear connector welds. The study included push-out tests to investigate shear properties of the connectors, bending tests on WTSCB specimens, and proposed design methods based on Eurocode 4.
ENGINEERING STRUCTURES
(2021)
Article
Chemistry, Physical
Julia Blazy, Lukasz Drobiec, Pawel Wolka
Summary: Fiber reinforcement is commonly used in various structural elements, with metallic fibers having well-documented mechanical properties compared to non-metallic fibers, especially those with new polymer fibers. Standardized testing methods for concrete with polymer fibers are lacking, making their application more challenging. Testing showed improved flexural tensile strength and ductility in fiber-reinforced concrete, but varied results in compressive strength. New formulas were proposed for concrete with polymer fibers. Digital Image Correlation was successfully used to analyze crack behavior in the concrete samples.
Article
Mechanics
Ali Fallah Pour, Rupesh K. Verma, Giang D. Nguyen, Ha H. Bui
Summary: This paper focuses on the transition from diffuse to localized failure of sandstone and concrete specimens under uniaxial compression and the correlation between macro responses and localized deformations at different stages of deformation. The Digital Image Correlation (DIC) technique is used to obtain full-field strain evolution, which enables the identification of bifurcation from homogeneous to localized deformation. The results show different bifurcation characteristics of sandstone, normal strength concrete, and high strength concrete under uniaxial compression. The transition from diffuse to localized failure is found to be gradual even for very brittle behavior with snap-back. Statistical distribution of strain and its evolution during this transition are investigated to provide a lower-scale form of strain distribution and evolution.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Lukasz Skarzynski, Ireneusz Marzec, Krzysztof Drag, Jacek Tejchman
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2020)
Article
Materials Science, Multidisciplinary
J. Kozicki, J. Tejchman
Article
Polymer Science
Piotr P. Szewczykowski, Lukasz Skarzynski
Article
Engineering, Mechanical
L. Skarzynski, I Marzec, J. Tejchman
INTERNATIONAL JOURNAL OF FATIGUE
(2019)
Article
Materials Science, Multidisciplinary
L. Skarzynski, J. Tejchman
MATERIALS CHARACTERIZATION
(2019)
Article
Engineering, Geological
M. Krzaczek, M. Nitka, J. Kozicki, J. Tejchman
Article
Construction & Building Technology
Lukasz Skarzynski
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Lukasz Skarzynski, Ireneusz Marzec
Summary: The paper presents experimental and numerical investigations of shear fracture in rectangular concrete beams reinforced with steel or basalt bar under quasi-static three point bending. Various techniques were used to study and analyze the shear fracture process zone and material micro-structure, air voids, and shear cracking characteristics. The results of experiments and numerical simulations showed satisfactory agreement in terms of failure mechanism, load-bearing capacity, and cracking patterns.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Lukasz Skarzynski, Jacek Tejchman
Summary: This study investigated the fracture process of reinforced concrete beams under quasi-static three-point bending, with a focus on crack formation and load-deflection diagrams. The use of basalt reinforcement resulted in steeper diagonal shear cracks, higher crack volume, and wider maximum crack width, as well as increased deflection and crack inclination. The relationship between crack volume and beam deflection was found to be bi-linear, with both aggregate breakage and crack branching observed during beam bending.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
P. Jasik, J. Franz, D. Kedziera, T. Kilich, J. Kozicki, J. E. Sienkiewicz
Summary: In this theoretical study, the two-channel decay process of the diatomic silver anion (Ag2-) was investigated by calculating ground state potential energy curves, estimating electron autodetachment lifetimes, and implementing quantum dynamics methods for rotational dissociation. The results were verified by comparison with experimental data.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Janek Kozicki, Anton Gladky, Klaus Thoeni
Summary: This paper discusses the implementation of arbitrary precision calculations in the open-source discrete element framework YADE, enabling its use in new fields such as quantum mechanics. The addition of support for high-precision types improves the accuracy of the computation results.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Lukasz Skarzynski, Katarzyna Kibort, Aleksandra Malachowska
Summary: This paper presents experimental investigations on the protective ability of concrete covers against rebar corrosion in reinforced concrete cubes. The concrete sample was subjected to a chloride-induced environment to induce corrosion, and the corrosion effects were studied through detailed measurements and analyses. The results showed that despite the accelerated corrosion environment, the concrete cover exhibited a protective ability against rebar corrosion.
Article
Materials Science, Characterization & Testing
Erwin Wojtczak, Magdalena Rucka, Lukasz Skarzynski
Summary: The paper presents a study on the continuous-time monitoring of mechanical degradation in concrete cubes during splitting, using integrated coda wave interferometry (CWI), digital image correlation (DIC), and X-ray micro-computed tomography (micro-CT). DIC and micro-CT techniques were employed to analyze the fracture process, while CWI method showed promise in assessing damage level based on changes in decorrelation between coda wave signals. This research has potential applications in early detection of concrete element damage.
NDT & E INTERNATIONAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Janek Kozicki
Summary: This article presents a fast and high-precision C++ implementation of the semi-global time propagation algorithm for molecular systems. It can describe time-dependent processes after excitation by femto-and attosecond laser pulses, and it works with an arbitrary user supplied Hamiltonian for nonlinear problems.
COMPUTER PHYSICS COMMUNICATIONS
(2023)
Article
Optics
J. Kozicki, P. Jasik, T. Kilich, J. E. Sienkiewicz
Summary: We investigate the dynamics of multiple coupled states in the NaRb dimer under the influence of an arbitrary time-dependent external field, examining the femtosecond laser-driven excitation and spin-orbit mediated dissociation. The dimer is excited from the ground triplet state to the 1 3 11 state using a femtosecond laser impulse, and the singlet-triplet transition is facilitated by the spin-orbit coupling between the 1 3 11 and 2 1 E+ states. Optimized laser impulse parameters are used to obtain maximum yield in electronic states correlating to the first excited atomic asymptote. Detailed population statistics and power-law decay of these states are observed. The analysis of population oscillations enables determination of the optimal time delay for dumping the molecule to its absolute ground state.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
