Article
Materials Science, Characterization & Testing
Zhen-Gang Feng, Xiaoran Gong, Xiangnan Li, Qi Cui, Dongdong Yao
Summary: This study investigates the effects of different polymer latex powders on high toughness concrete, and the results show that the addition of ethylene vinyl acetate and styrene butadiene can significantly improve the mechanical properties and durability of the concrete.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Marthe Loiseau, Sylvain Chataigner, Romain Creachcadec, Emilie Lepretre, Jean-Philippe Court, Marie-Odette Quemere
Summary: Structural adhesive bonding has advantages over welding and riveting. However, creep is an important long-term phenomenon that needs to be considered. Experimental investigations at the scale of the adhesive layer are necessary. The Arcan test method was chosen for its advantages and a mechanical testing machine was developed to study the creep behavior of adhesive layers.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Dongyu Xu, Huaicheng Chen, Mei Cao, Yuli Cui, Junsheng Bai, Shoude Wang
Summary: Freezing and thawing behavior is crucial for the durability of engineering structures in cold regions. This study developed an acoustic emission (AE) sensor to evaluate the freezing-thawing characteristics of concrete. The results showed that freezing-thawing cycles increased the ring down count (RDC) and decreased the accumulative energy of the concrete.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhen Liu, Xingyu Gu, Qiao Dong
Summary: A method for predicting rutting in semi-rigid pavement structures was proposed using accelerated loading tests and finite element analysis. Dynamic modulus and creep tests were conducted on three pavement materials to obtain a prediction equation, which was then validated using the falling weight deflectometer test and back-calculation modulus. The results showed that rutting deformation varied under different conditions, highlighting the need for maintenance and repair of pavement structures.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Zhengzhen Wang, Lei Huang, Guoliang Dai, Feng Li, Tianzhong Ma
Summary: The grouting effect of pile end and pile side combined post-grouting technology in cohesive soil was studied. It was found that the combined grouting significantly improved the load-bearing capacity of the piles, effectively controlled the settlement, and increased the pile end resistance and pile side friction.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
A. Rajesh, A. Sumathi, D. Gowdhaman
Summary: This study explores the use of natural fibers and bacteria to improve the healing of concrete cracks. By examining the precipitation of calcium carbonate crystals produced by bacteria, the researchers find that the selected bacteria have the ability to heal cracks and improve the mechanical and durability properties of concrete. The results suggest that natural fibers can be used as sustainable carrier material for crack healing and strength improvement in concrete.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Donghui Cheng, Ke Li, Xiaoting Wang
Summary: This study investigated the effects of carbon fiber-reinforced polymer (CFRP) on the compressive properties of reactive powder concrete (RPC) during freezing and found that low-temperature curing resulted in a significant degradation of RPC's mechanical properties. The use of CFRP and carbon fiber filaments can increase the ultimate load capacity and improve the toughness of RPC at low temperatures.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Renhe Yang, Pengyu Zhang, Dongmei Wang, Qian Sun, Tingshu He
Summary: This study tested and evaluated the carbonation resistance of sprayed concrete mixed with different liquid accelerators and attempted to establish a prediction model for carbonation depth. The influence of different liquid accelerators on carbonation resistance was explored and the porosity, pore structure distribution, and strength properties were analyzed. The results showed that different liquid accelerators had varying effects on carbonation depth. Prediction models for carbonation depth were preliminarily established.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Enlai Dong, Dingqiang Fan, Xianwei Ma, Peibo You
Summary: This paper summarizes the influencing factors, evaluation methods, and theoretical models of steel fiber dispersion in ultra-high-performance concrete (UHPC). It indicates that a scientifically designed mixture and adjustment of matrix rheological properties can improve fiber dispersion. In addition, flow induction and the wall effect can enhance the orientation of fibers and improve the performance of UHPC matrix.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Wei Zeng, Yuzhu Liu, Shangzhi Yu, Shikai Qi, He Wu, Li Liu
Summary: In this study, a PCA-adaboost.M2 algorithm based on ultrasonic guided waves is proposed for the classification and identification of rail fatigue cracks. The experimental results show that the algorithm has good performance in quantitative detection of the rail fatigue crack depth.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
Donia Ammous, Amina Kessentini, Abdelaziz Kallel, Fahmi Kammoun, Nouri Masmoudi
Summary: This study aims to develop an approach to decrease the computing complexity of the prediction module in H.264/AVC video coding. The developed software algorithm allows users to manage and monitor unmanned aerial vehicles in real time, improving network performance.
JOURNAL OF TESTING AND EVALUATION
(2024)
Review
Materials Science, Characterization & Testing
Phibadeity S. Marwein, Samarendra Nath Sur, Xiao-Zhi Gao, Debdatta Kandar
Summary: This paper introduces the development and challenges of the Internet of Vehicles (IOV), compares different architectures of IOV, and explores possible solutions. The focus of the article is on the challenges of high mobility, load balancing, security, and heterogeneity in IOV.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Materials Science, Characterization & Testing
R. Muralimohan, U. N. Kempaiah, G. B. Veeresh Kumar
Summary: This study focuses on the characteristics of hybrid metal matrix composites in terms of optical, physical, mechanical, tribological, and corrosion behavior. By reinforcing ADC12 alloy with rice husk ash and boron carbide, the researchers found that increasing the reinforcement content improves the physical and mechanical characteristics, while decreasing the elongation percentage. Moreover, the corrosion resistance of the composites also increases with higher reinforcement content, and composites with a higher percentage of reinforcement have superior wear resistance.
JOURNAL OF TESTING AND EVALUATION
(2024)
Article
Mechanics
Abhik Sur
Summary: This paper studies the photo-thermoelastic response of a finite thin strip exposed to a moving heat source, using a novel thermo-viscoelastic theory. The solutions of physical fields are evaluated and the effects of different parameters are analyzed. It is proposed that a nonlinear kernel function is superior in this context.
MECHANICS OF TIME-DEPENDENT MATERIALS
(2023)
Article
Materials Science, Characterization & Testing
E. O. Onyshchenko, V. V. Matveev, O. L. Derkach, O. E. Bohinich
Summary: This paper presents analytical and numerical methods based on finite element modeling to determine vibrodiagnostic indicators of the presence of a transverse edge crack closing in a cantilever composite beam made of orthotropic material. The study results show the effect of the crack presence on the change in the main vibration frequency and on the ratio of the amplitudes of the dominant harmonics at the main, superharmonic order 1/2, and subharmonic order 2 resonances. It is found that for a composite beam reinforced in the bending plane with unidirectional fibers with laying angles relative to the axis of 0...40 degrees, it is appropriate to use the change in the natural vibration frequency as a vibration diagnostic indicator, and for larger angles, the ratio of the amplitudes of the dominant harmonics at super- and subharmonic resonances may be practically important.
STRENGTH OF MATERIALS
(2023)
Article
Materials Science, Characterization & Testing
Philipp Thumann, Stefan Buchner, Steffen Marburg, Marcus Wagner
Summary: This paper compares the method of approximating elastic-plastic parameters proposed by Glinka with Neuber's formula and Basquin's stress-life method. Tests are conducted on 42CrMoS4-QT specimens, and it is shown that the strain-life method using Glinka's concept yields improved results in fatigue strength assessments.
Article
Mechanics
Sami F. Megahid, Ahmed E. Abouelregal, Hamid M. Sedighi
Summary: This study introduces a mathematical formulation based on the MGT equation, which accurately predicts the thermal response of human skin to temperature variations. The key differentiating factor of this model is the incorporation of the concept of time delay, effectively restricting the propagation rate of thermal energy.
MECHANICS OF TIME-DEPENDENT MATERIALS
(2023)
Article
Materials Science, Characterization & Testing
Rabboni Mike Government, Edozie Thompson Okeke
Summary: The influence of particle size on the characteristics and water absorption resistance of avocado pear wood fiber/low-density polyethylene (APWF/LDPE) composite with pretreatment was investigated. The study demonstrated that smaller fiber particle size improved the mechanical properties and water absorption resistance of the composite. The best properties were observed in the APWF/LDPE composite using 150 μm fiber particles pretreated with NaOH + CH3COOH + MAPE.
Article
Thermodynamics
Shayan Davani, Bin Zhang, Brendon Doran, Luke Hansen, Mohammad Khan, Mahdi Roodbari, Wen Jin Meng, Arden L. Moore
Summary: This study experimentally determined the pool boiling performance of four different surface types (planar, nanoscale-modified, microscale-modified, and hierarchical) in a low surface tension fluid. The best performing samples were nanoscale-modified surfaces, rather than hierarchical ones. Visual observations of vapor bubble behavior were used to explain the superior performance of the nanoscale-modified surfaces and future directions for achieving surface optimization across multiple length scales were discussed.
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
D. M. Williamson, O. J. Morley
Summary: This article investigates the impact-induced reaction of granular secondary explosives using a split Hopkinson pressure bar arrangement. By measuring the absorbed energy and reaction time, the transfer and absorption of mechanical energy in the specimens are studied. The experimental results are important for understanding the reaction mechanism and performance of explosives.
JOURNAL OF DYNAMIC BEHAVIOR OF MATERIALS
(2023)
