Article
Automation & Control Systems
Xiaobo Wang, Chaosheng Song, Lulu Li, Feng Jiao
Summary: This article analyzes the influence of fiber cutting angle on cutting force in carbon fiber-reinforced plastics (CFRP). A theoretical model is established for ultrasonic assisted cutting force, and experiments are conducted to compare it with normal cutting. The results show that ultrasonic assisted cutting can reduce cutting force, and the fiber cutting angle has a significant impact on tangential force.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Ci-Rong Huang, Bing-Mai Liao, Chen-Yu Kai, Cheng-Mu Su, Jui-Pin Hung
Summary: This study investigates the effects of process parameters on cutting force and delamination in ultrasonic vibration-assisted drilling of CFRPs. Experimental analysis and regression models were used to predict and analyze the evolution of cutting force. The results provide insights for selecting appropriate drilling parameters to minimize cutting force on CFRP composites.
Article
Automation & Control Systems
Ting Qin, Zhixian Zhong, Hui Jiao, Liao Zhou, Yuxing Huang, Yuhong Long
Summary: This study explores the method of low-damage gas-assisted laser processing of carbon fiber reinforced plastics. It investigates the impact of three gas-assisted methods (coaxial nitrogen, coaxial oxygen, and coaxial oxygen paraxial nitrogen compound) on cutting quality using a QCW450 quasi-continuous fiber laser cutting machine. The study also uses a single-factor experiment method to analyze the effects of laser peak power, scanning speed, and gas pressure on processing quality, focusing on the size of the heat-affected zone, cutting depth, and width of the upper slit. The research provides insights into the action mechanism of gas-assisted laser processing of carbon fiber reinforced plastics.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Xinyu Zhao, Ke Chen, Min Guo, Chenxi Li, Chenyang Li, Guangyin Zhang, Zhenfeng Gong, Zhi Zhou, Wei Peng
Summary: We proposed and designed a high-sensitivity fiber-optic photoacoustic gas analyzer based on resonant Herriott multipass cell and fiber-optic cantilever acoustic sensor. The experimental results showed that the system achieved a minimum detection limit of 3.7 ppb for CH4 and demonstrated good stability.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Construction & Building Technology
Se-Eon Park, Jeong-Il Choi, Huy Hoang Nguyen, Quang-Hieu Luong, Phu'o'ng Hoang Nguyen, Bang Yeon Lee
Summary: This paper presents a new type of sustainable and ultra-ductile cementless composites. By replacing cement and fibers with alkali-activated materials and short selvedge fibers, respectively, the composites show improved compressive strength and tensile behavior. The sustainable indicators, including embodied energy, carbon dioxide emission, and material cost, are significantly enhanced by incorporating cementless binders and short selvedge fibers. Additionally, the tensile toughness of the composites reinforced by short selvedge fibers is 1.3 to 12 times higher than that of previously reported highly ductile composites.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Manufacturing
Jewook Yang, Jae-Hyuk Choi, Jinhyeok Jang, Hyonwoo Pang, Jeong-Min Cho, Woong-Ryeol Yu
Summary: A progressive pseudograin damage accumulation (PPDA) model is proposed to predict the fatigue life of short fiber-reinforced plastics (SFRPs). The model combines the viscoelastic-viscoplastic (VEVP) two-step homogenization theory and Chaboche fatigue damage model. Each representative volume element (RVE) of SFRPs is decomposed into pseudograins, and the fatigue life of each pseudograin is predicted using a master S-N curve. The overall failure of RVE is predicted by a PPDA model, which takes into account the stress concentration of the living pseudograins and results in non-linear fatigue damage evolution. The PPDA model is implemented into ABAQUS, and the predicted fatigue lifetime agrees well with experimental data.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Review
Engineering, Manufacturing
Joerg Hohe, Achim Neubrand, Sascha Fliegener, Carla Beckmann, Michael Schober, Klaus-Peter Weiss, Simon Appel
Summary: The demand for lightweight fuel vessels for future launch vehicles in aerospace technology and hydrogen technology in terrestrial applications has led to the need for validated procedures for assessing fiber reinforced plastic structures under cryogenic environments. This study focuses on the assessment of FRP materials under cryogenic temperatures, covering aspects such as strength, toughness, failure mechanisms, and characterization procedures for material data determination.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Tolga Topkaya, Yuan Gao, Philippe H. Geubelle
Summary: This study investigates the manufacturing of short-fiber-reinforced polymeric matrix composites based on frontal polymerization (FP) using numerical analysis and analytical predictions. The results show the dependence of the steady-state front velocity and inclination angle on the fiber orientation angle and volume fraction.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Mechanics
Xiaofan Xu, Xiaoliang Jin
Summary: This paper investigates the effects of fiber orientation and oblique angle on cutting forces and surface damage in the oblique cutting process of unidirectional CFRP. A 3-D finite element model is proposed to simulate the cutting process and the results are validated through experiments.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Chao Zhang, Yuxiang Huang, Chongcong Tao, Jinhao Qiu, Hongli Ji
Summary: This study presents a guided wave based fatigue property evaluation method for characterizing matrix crack accumulation in fiber reinforced plastics (FRPs). A finite element model is developed to simulate fatigue induced matrix cracks, and the mode conversion effect of guided waves is investigated. The results show that the guided wave characteristic MCI is more sensitive to the degree of matrix crack accumulation compared to macroscopic stiffness.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Jae-Yeon Yang, Dong-Kyu Kim, Woong Han, Jong-Yeon Park, Kwan-Woo Kim, Byung-Joo Kim
Summary: In this study, natural fiber-reinforced polylactic acid (NFRP) composite materials were prepared by adding nucleating agents (NAs) and natural fiber (NF) to improve the thermal stability and mechanical properties of polylactic acid (PLA). The results showed that the addition of nucleating agents significantly increased the thermal stability and crystallinity of the composite, while the changes in thermal stability and mechanical properties were insignificant when the concentration of nucleating agents reached a certain value.
Article
Construction & Building Technology
Yasin Onuralp Ozkilic, Alexey N. Beskopylny, Sergey A. Stelmakh, Evgenii M. Shcherban, Levon R. Mailyan, Besarion Meskhi, Andrei Chernilnik, Oxana Ananova, Ceyhun Aksoylu, Emrah Madenci
Summary: This article explores the possibility of creating lightweight expanded-clay fiber concrete (ECFC) with improved characteristics through the use of dispersed organic fibers. It is found that the reinforcement of ECFC with plant fibers has a positive effect on its mechanical properties, with sisal fibers performing better than coconut fibers. The addition of fibers results in significant increases in compressive and flexural strength, as well as improvements in the constructive quality values of ECFC.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Optics
I Sakaev, A. A. Ishaaya
Summary: The study introduces a strategy to reduce excessive melting at the top edge of the cut in laser assisted oxygen cutting of mild carbon steel, demonstrating high-quality cuts in 20 mm thick workpieces and lower quality separation in up to 40 mm steel thickness. The experimental results highlight the potential of high-power diode sources in LASOX cutting and the capability of compact and lightweight diode-based systems in cutting thick sections of mild steel.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Environmental
Valentin Sommer, Grit Walther
Summary: Establishing recycling and recovery infrastructures for innovative materials like high-performance composites is challenging, with the need for development of secondary markets and incentives for co-processing. Future recycling of CFRP depends on secondary markets, while GFRP is mainly combusted or co-processed. Political decision makers should focus on supporting the development of secondary markets and providing incentives for co-processing to overcome capacity limitations.
Review
Polymer Science
Pi-Yu Chen, Ran Feng, Ying Xu, Ji-Hua Zhu
Summary: This paper provides an overview of the current status of carbon fiber-reinforced plastics (CFRP) waste and presents a systematic review of recycling technologies. It discusses various methods such as mechanical recycling, thermal decomposition, chemical solvent degradation, and the organic alkali/organic solvent method for recycling resins. The study highlights the significance of the organic alkali/organic solvent method as a reference for carbon fiber recycling and reviews the utilization of recycled carbon fibers (rCFs) in different application domains. The paper identifies research limitations and areas that require further attention in recycling techniques and rCFs utilization, while also providing a future prospect on the recycling and reusing of CFRP waste.
Article
Optics
Florian Bienert, Thomas Graf, Marwan Abdou Ahmed
Summary: This paper presents a theoretical investigation on the application of laser interference lithography for the exposure of linear gratings. The focus is on the geometry of the interference lines on the substrate, specifically their period and orientation, depending on the illumination geometry determined by the setup.
Article
Materials Science, Multidisciplinary
David Brinkmeier, Daniel Holder, Andre Loescher, Christoph Roecker, Daniel J. Foerster, Volkher Onuseit, Rudolf Weber, Marwan Abdou Ahmed, Thomas Graf
Summary: Commercial ultrafast lasers with kW power levels show potential for high-volume manufacturing, but limitations such as particle shielding, atmosphere breakdown, and heat accumulation need to be addressed. Experimental validation of a thermal model for AISI 304 steel drilling highlights the importance of a critical heat accumulation threshold. A processing map summarizes these limits and provides guidance for parameter selection and laser suitability, stressing the importance of process parallelization.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Gerd Reichardt, Manuel Henn, Paul Reichle, Georg Umlauf, Kim Riedmueller, Rudolf Weber, Jakob Barz, Mathias Liewald, Thomas Graf, Guenter E. M. Tovar
Summary: In the deep drawing process, lubricants are essential to prevent wear and surface damage, but traditional options pose environmental and health risks, leading to research on a new system using liquid carbon dioxide and nitrogen gas introduced through micro-holes. Further investigations are focused on the lubrication medium's impact on tool wear.
Article
Optics
Christoph Roecker, Pascal Weinert, Philippe Villeval, Dominique Lupinski, Martin Delaigue, Clemens Hoenninger, Rudolf Weber, Thomas Graf, Marwan Abdou Ahmed
Summary: This study reports on the analysis of nonlinear absorption in lithium triborate (LBO) for second and third harmonic generation. The absorption coefficients were estimated using thermographic imaging and numerical modeling, and high power harmonic generation results were obtained.
Article
Optics
Pavel A. Chizhov, Maxim S. Komlenok, Vitali V. Kononenko, Vladimir V. Bukin, Alexander A. Ushakov, Vladislava V. Bulgakova, Andrey A. Khomich, Andrey P. Bolshakov, Vitaly Konov, Sergey Garnov
Summary: This study successfully achieved the generation of terahertz radiation in a nitrogen-doped single-crystal diamond material and investigated the performance of diamond antennas with different dopant levels. The results revealed a low saturation level for high-nitrogen-containing diamond substrates, indicating the potential of doped diamond as a material for high-efficiency large-aperture photoconductive antennas.
Article
Chemistry, Analytical
Maxim S. Komlenok, Margarita A. Dezhkina, Vadim S. Sedov, Oleg A. Klimenko, Sergey A. Dyakov, Nikolay A. Gippius
Summary: This paper reports on the laser microstructuring of thin nanocrystalline diamond membranes for the first time. A diamond membrane with a two-dimensional periodic array of closely located chiral elements was fabricated to demonstrate the possibility of microstructuring. The fabrication technique is described, and the measured infrared transmission spectra of the fabricated membrane are presented. The theoretical study shows that the metamembrane supports quasiguided modes and exhibits circular dichroism in transmission. The developed technique has potential applications in infrared photonics and can pave the way for new-generation infrared filters for circular polarization.
Article
Nanoscience & Nanotechnology
Marwan Abdou Ahmed, Frieder Beirow, Andre Loescher, Tom Dietrich, Danish Bashir, Denys Didychenko, Anton Savchenko, Christof Pruss, Marina Fetisova, Fangfang Li, Petri Karvinen, Markku Kuittinen, Thomas Graf
Summary: This study demonstrates the intracavity generation of beams with radial polarization using circular grating waveguide output couplers and the conversion of femtosecond laser pulses from linear to azimuthal polarization using a nanograting-based polarization converter. The optimization of the duty cycle and geometrical profile of the gratings can enhance the stability and performance of the polarization function.
Article
Optics
Vitali V. Kononenko, Maxim S. Komlenok, Pavel A. Chizhov, Vladimir V. Bukin, Vladislava V. Bulgakova, Andrey A. Khomich, Andrey P. Bolshakov, Vitaly I. Konov, Sergey V. Garnov
Summary: The efficiency of terahertz radiation generation from nitrogen-doped diamonds was studied in relation to optical excitation intensity. The nitrogen concentration in the diamonds was measured and a correlation was observed between the doping level and the performance of diamond-based antennas, demonstrating the potential of doped diamond as a highly efficient material for photoconductive antennas.
Article
Chemistry, Physical
Vitali V. Kononenko, Kuralay K. Ashikkalieva, Natalia R. Arutyunyan, Alexey M. Romshin, Taras Kononenko, Vitaly Konov
Summary: We conducted an experimental study on laser-induced plasma in a gold aqueous solution and explored the correlation between plasma properties and the rate of gold nanoparticles synthesis. The concentration of photo-excited carriers was measured using pump-probe and scattering microscopy techniques. The experimental data helped us identify the ionization mechanisms in liquid water and link them to the synthesis of nanoparticles.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Optics
Taras Kononenko, Dmitry N. Sovyk, Vitaly V. Kononenko, Vitaly Konov
Summary: This study focuses on the influences of laser fluence, spot size, and spot overlapping on the surface roughening and ablation productivity of silicon during laser milling. An optimized process for silicon milling is proposed, which involves reducing the laser fluence by enlarging the laser spot and maintaining a low ratio of spot displacement to spot radius. Numerical simulations are conducted to determine the dominant factor in surface roughening under different processing conditions.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Nikolay Kurochitsky, Pavel Pivovarov, Maxim Rybin, Elena Obraztsova
Summary: A new method for fabricating graphene field emitters on various substrates at room temperature and in ambient environment is presented. The desired shape and orientation of graphene flakes along the field are achieved through blister-based laser-induced forward transfer of high-quality single-layer graphene synthesized by chemical vapor deposition. This technique allows the formation of emitting crumpled graphene patterns without compromising the quality of initially synthesized graphene.
Article
Materials Science, Multidisciplinary
K. K. Ashikkalieva, T. V. Kononenko, E. E. Ashkinazi, E. A. Obraztsova, A. A. Mikhutkin, A. A. Timofeev, V. I. Konov
Summary: This paper examines the nanostructured interior and conductive characteristics of graphitized wires formed inside diamond crystals using laser microstructuring. The study finds that rotating the laser beam inside the crystal changes the arrangement of the nanoplates, but has little influence on the macroscopic conductivity of the wires. However, increasing the laser pulse width increases both the wire conductivity and the thickness of the nanoplates.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Optics
Vitali V. V. Kononenko, Evgeny V. V. Zavedeev, Taras V. V. Kononenko, Vladimir V. V. Bukin, Vitaly I. I. Konov
Summary: This paragraph discusses the propagation of a graphitization wave through a diamond crystal under multipulse laser irradiation, which is largely a self-guided process. The authors develop new approaches to control laser graphitization for 3D laser microstructuring inside a diamond crystal. Two techniques are investigated: laser seed damage followed by exposure at lower laser fluence to restrict the graphitization wave propagation, and formation of a dominant microfracture perpendicular to the laser beam to guide the growth of graphitized threads.
Article
Optics
Taras Viktorovich Kononenko, Kuralai Khamitzhanovna Ashikkalieva, Vitali Viktorovich Kononenko, Evgeny Viktorovich Zavedeev, Margarita Alexandrovna Dezhkina, Maxim Sergeevich Komlenok, Evgeny Evseevich Ashkinazi, Vladimir Valentinovich Bukin, Vitaly Ivanovich Konov
Summary: Recently, it was discovered that a nitrogen-doped diamond-based photoconductive antenna (PCA) can be effectively excited by the second harmonic of a Ti:sapphire laser. The THz emission performance of the PCA can be significantly improved by creating a stronger electric field between closely located electrodes. To achieve a uniform electric field, deep-buried graphite electrodes were fabricated inside the diamond crystal. Different PCAs with various electrode interspaces were tested and compared.
Article
Physics, Multidisciplinary
T. V. Kononenko, K. K. Ashikkalieva, V. V. Kononenko, A. P. Bol'shakov, V. G. Ral'chenko, V. I. Konov
Summary: A technique of two-stage three-dimensional mapping is proposed to study the optical breakdown threshold in diamond crystals. The first stage involves irradiating the diamond with high-energy ultrashort laser pulses to initiate microbreakdowns, causing the formation of graphite microinclusions. The second stage measures the absolute value of the breakdown threshold by identifying the minimum laser pulse energy required for the formation of a graphite microinclusion. This technique revealed abnormal crystal zones in synthetic diamond single crystals, where the breakdown threshold changes by a factor of more than 10.
PHYSICS OF WAVE PHENOMENA
(2023)
