Article
Engineering, Multidisciplinary
Mathias Haingartner, Sandra Gschossmann, Max Cichocki, Martin Schagerl
Summary: This article introduces a new current injection pattern for electrical impedance tomography, which improves hole detection quality in carbon fiber reinforced polymer plates and allows for delamination detection. The advantages of the new pattern are demonstrated through numerical finite element analyses and experimental validation.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Instruments & Instrumentation
Wenru Fan, Chi Wang
Summary: Damage estimation is crucial for monitoring the remaining life of carbon fiber reinforced plastic/polymer (CFRP). Electrical impedance tomography (EIT) is increasingly being studied as a non-invasive and low-cost method for structural health monitoring of CFRP. A new damage estimation method (DEM) is proposed in this paper to quantify the location and area of damage, showing promising potential based on simulation and experimental results.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Materials Science, Composites
Monica Sannamani, Jinling Gao, Weinong W. Chen, Tyler N. Tallman
Summary: Carbon fiber reinforced polymers (CFRPs) are promising alternatives to traditional metals in weight-conscious applications due to their superior strength-to-weight properties. However, they are susceptible to complex and difficult-to-predict sub-surface damages. This paper investigates the application of electrical impedance tomography (EIT) to non-planar CFRP geometries and proposes a modified EIT sensitivity matrix formulation to incorporate the electrical anisotropy of the material.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
Yishuo Huang, Ming -Gin Lee, Yu-Cheng Kan, Wei -Chien Wang, Yung-Chih Wang, Wei -Bang Pan
Summary: This study explores the retrofitting of reinforced concrete beams with ultra-high-performance concrete (UHPC) or carbon fiber-reinforced polymer (CFRP). The results show that UHPC increases the ultimate load of the beams by 35% and their displacement by 26.8 mm, making it a better choice in terms of toughness and economic benefits.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Helena Rocha, Christophe Fernandes, Nelson Ferreira, Ugo Lafont, Joao P. Nunes
Summary: This study utilized EIT with a GN algorithm to detect anisotropic damage on composite laminates, finding that the technique could identify different shapes and sizes of damage, but tended to overestimate the damaged area in comparison to ultrasonic inspections.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Helena Rocha, Christophe Fernandes, Nelson Ferreira, Ugo Lafont, Joao P. Nunes
Summary: This study utilized electrical impedance tomography (EIT) with an algorithm to detect damages in composite materials, different degrees of damages were identified, but challenges were encountered in highly anisotropic materials as EIT images tend to overestimate damage areas.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Mechanics
Lili Hu, Peng Feng
Summary: The use of PS CFRP technology effectively enhances the buckling resistance of steel columns. Axial and eccentric compression tests were conducted under different conditions, analyzing the buckling capacity and failure modes, and further establishing a model of the buckling mechanism.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Qian Xue, Kai Zhang
Summary: A new method with the integrated attention mechanism of IPDC network model is proposed to address the challenges of EIT in CFRP damage detection. Simulation and prototype results demonstrate that this method can reduce artifacts in damage images, improve accuracy in damage location, and enhance the definition of damage edges.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Yu Cheng, Wenru Fan
Summary: This article proposes a U-Net combined with a shallow residual network method for the detection of damage in CFRP. The method is validated through the comparison of simulated data and experimental results.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Mechanics
Wuke Xu, Qi Wu, Hanqi Zhang, Chen Gong, Rong Wang, Jiyun Lu, Ke Xiong
Summary: The study introduced a new fiber Bragg grating-based acoustic emission sensor for intensive investigation of the damage process of a carbon-fiber reinforced plastic T-joint under loading. Experimental findings showed that the sensor effectively detected the acoustic emission signals caused by debonding and were consistent with the finite element simulation results.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Petr P. Polskoy, Dmitry Mailyan, Alexey N. Beskopylny, Besarion Meskhi, Aleksandr V. Shilov, Artur Umarov
Summary: Many studies focus on using polymer composite materials to increase the strength and stability of concrete elements. This study aimed to increase the strength and stiffness of compressed reinforced concrete elements reinforced with composite materials, and compared the bearing capacity of ten different combinations of reinforcement. The results showed that using composite materials can increase the bearing capacity by up to 41% and the stiffness by up to 30%. Recommendations were proposed for improving the calculation method for inflexible columns reinforced in the transverse direction, taking into consideration the three-dimensional stress state of concrete.
Article
Engineering, Civil
Lili Hu, Peng Feng
Summary: This paper theoretically analyzes the symmetrical global buckling behavior of imperfect prestressed CFRP laminate-reinforced steel columns with two hinged supports, and proposes calculation methods for the buckling capacity and the optimal CFRP initial prestressing force and maximum buckling capacity. Finally, a design method for PCRSCs and a design example are provided.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Engineering, Civil
Tao Wu, Yijia Sun, Xi Liu, Yantao Cao
Summary: The experimental investigation compared the flexural behavior of lightweight aggregate concrete beams reinforced and prestressed with CFRP bars, showing that prestressing force and steel fibers can reduce deflection and crack width, while longer clear span length results in wider cracks. A geometry-based model and iterative algorithm were proposed for calculating the deflection and stress increment of beams prestressed with unbonded FRP tendons.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Manufacturing
Jungsub Kim, Heebum Chun, ChaBum Lee
Summary: We propose a method for monitoring the CFRP milling process using a multi-axis displacement sensor integrated with a precision spindle system. Unlike traditional methods, our method utilizes curved-edge and capacitive sensors to measure the spindle motions and estimate cutting forces using a stiffness matrix. Additionally, we analyze time-frequency domain spectrogram images of the cutting force data to monitor and characterize CFRP defects.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Multidisciplinary
Lu Yang, Hongtao Wu, Yongnian Zhang, Hanyang Huang, Kai Liu, Bai Chen, Jiafeng Yao
Summary: A method for monitoring medaka embryo development using differential Electrical Impedance Spectroscopy (EIS) is proposed, which can extract the electrical characteristics of the embryo while eliminating the influence of electrodes and suspension. Simulation and experimental results demonstrate that this method can accurately reflect the morphological and physiological changes of the embryo.