Article
Mechanics
Wenyuan Li, Youmin Rong, Yu Huang, Long Chen, Zhihui Yang, Guojun Zhang
Summary: This paper investigates the dynamic and static mechanical behavior of short pulse laser cutting CFRP and explores the effect of cutting damage on mechanical properties. The study finds that cutting damage weakens the tensile and bending strength of CFRP plate by 11.5% and 6.2% respectively. Furthermore, large cutting damage aggravates tensile fatigue crack propagation and fiber protrusion. The research results provide important insights for damage suppression and improvement of material mechanical properties.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Optics
Maojun Li, Limei Chen, Xujing Yang
Summary: This study explored the feasibility of high-power fiber laser cutting thick CFRP laminates with a single-pass strategy, finding that appropriate laser power and cutting speed can improve surface quality effectively without causing damage due to excessive thermal energy. Successfully cutting through 10.0 mm thick CFRP laminates using high-power fiber laser and single-pass strategy was achieved in the experiment, providing benchmark data for further industrial applications.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Wenyuan Li, Youmin Rong, Yu Huang, Xinghua Chen, Long Chen, Guojun Zhang
Summary: This paper proposes a new compound cutting method to regulate the surface damage of CFRP during laser cutting process, effectively improving the processing quality and mechanical properties of CFRP.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Mechanics
Guoyi Hou, Bin Luo, Kaifu Zhang, Yingxin Luo, Hui Cheng, Sipeng Cao, Yuan Li
Summary: The study found that heat accumulation during thick CFRP drilling may result in severe damages, but the specific cutting mechanism is still unclear.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Marine
Zhenfei Guo, Ruixiang Bai, Zhenkun Lei, Hao Jiang, Jianchao Zou, Cheng Yan
Summary: The ultimate strength and failure modes of laser-welded Al-Li alloy stiffened plates were experimentally and numerically analyzed in this study. The results show that the established finite element model considering welding deformation and residual stresses can accurately predict the performance of stiffened plates.
Article
Engineering, Geological
Timo Saksala
Summary: This paper presents a numerical method to predict the temperature weakening effects on tensile and compressive strength and stiffness of granitic rock. The simulation results demonstrate the validity of the proposed approach.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Mechanics
Xiaonan Wang, Fuji Wang, Xinghai Jin, Rao Fu, Yu Shi
Summary: A novel material failure model is developed in this study to predict the orthogonal cutting of CFRP. By considering the strain rate effect, the prediction accuracy of the model is improved. The effects of processing conditions on subsurface damage are also evaluated.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Peng Wang, Zhen Zhang, Bo Hao, Shichuan Wei, Yu Huang, Guojun Zhang
Summary: Carbon fiber reinforced plastic (CFRP) is widely used in aviation, medical, and motorbike industries due to its excellent mechanical properties and corrosion resistance. Nanosecond pulsed laser is an efficient method for machining microchannels and holes in CFRP plates. A numerical model considering heterogeneity and anisotropy of nanosecond laser processing CFRP was established, and comparison of simulation and experiments under different scanning directions showed a deviation of microchannel width ranging from 5.01% to 16.99%.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Chemistry, Analytical
Max Schleier, Benedikt Adelmann, Cemal Esen, Ralf Hellmann
Summary: We propose an in situ process monitoring approach for remote fiber laser cutting, which utilizes a high-speed camera and a specifically designed image processing algorithm to distinguish between complete and incomplete cuts. The camera-based monitoring system is suitable for high-power fiber lasers and can accurately evaluate the size of the melt pool and the emitted sparks during the cutting process.
Article
Engineering, Geological
Fuxin Rui, Gao-Feng Zhao
Summary: The study aims to develop a numerical tool for quantitative investigation of laser-induced rock damage, demonstrating that the multiparameter damage model is more suitable for numerical simulation in this field through experimental tests and model establishment.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Mechanics
La Han, Junjie Zhang, Yuan Liu, Qiumei Gu, Zengqiang Li
Summary: The study reveals the thermal-mechanical coupled material removal mechanisms of CFRP composites under thermal and cryogenic pretreatments in orthogonal cutting through macro-scale finite element simulations. It also investigates the temperature-dependent material characteristics of CFRP, such as cryogenic embrittlement and thermal softening, which have significant impacts on subsequent cutting processes. Additionally, the coupling effect between fiber orientation and pretreatment temperature on CFRP cutting is addressed, providing guidelines for enhancing machinability of CFRP composites.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Manufacturing
Zhihui Yang, Ya Lu, Wenyuan Li, Chunmeng Chen, Long Chen
Summary: This paper investigates the efficiency of CFRP hole-cutting using a nanosecond laser with a multi-pass scanning strategy. The study examines the differences in material removal mechanisms at different scanning spacing and the impact of scanning spacing on processing efficiency. Results show that material removal is achieved through the combined effect of laser ablation and mechanical erosion, and that the optimal scanning spacing and number of passes can effectively improve processing efficiency. With a repetition frequency of 80 kHz and a pulse energy of 141.25 μJ, the shortest cutting time is 73.3 s with an optimal scanning spacing of 0.06 mm. When compared to a scanning spacing of 0.08 mm and three passes, this configuration is 26.8% more efficient. Additionally, as the laser repetition frequency increases, the optimal scanning spacing for processing efficiency increases while the optimal number of passes decreases.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Civil
Xinghua Chen, Wenyuan Li, Youmin Rong, Guojun Zhang, Long Chen, Yu Huang
Summary: This paper presents an assisted laser cutting technology for carbon fiber reinforced polymer (CFRP) plate using dimethicone, which effectively reduces the heat-affected zone and improves the cutting quality. Through orthogonal experiments, the optimal cutting parameters were determined, resulting in a significant reduction (85.89%) in the heat-affected zone width.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Mechanics
Jinyang Xu, Tieyu Lin, Linfeng Li, Min Ji, J. Paulo Davim, Norbert Geier, Ming Chen
Summary: This study investigates the formation mechanisms of interface damage in composite/titanium stacks during machining, with a focus on the effects of cutting sequence strategies on stress and temperature distribution. The research highlights the dominant impact of cutting sequence strategy on interface damage and reveals the coupling effects of matrix damage and interface bending. The findings provide guidance for stack machining processes and cutting sequence selection.
COMPOSITE STRUCTURES
(2022)
Article
Optics
Yaowen Wu, Guangyi Zhang, Jianxin Wang, Yang Chao, Wenwu Zhang
Summary: This study explores the application of water jet guided laser processing technology in CFRP cutting, revealing the influence of process parameters on cutting results and achieving cutting of different thicknesses of CFRP through specific methods. Additionally, the impact of carbon fiber arrangement direction and laser cutting path on damage mechanisms are analyzed for the first time in this research.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Zhi-Huan Pang, Meng Liu, Ai-Ping Luo, Yi Xu, Wen-Cheng Xu, Songnian Fu, Zhi-Chao Luo
Summary: We propose a novel mode-dependent gain equalizer using a few-mode chirped fiber Bragg grating (FM-CFBG) to effectively mitigate the mode-dependent gain in an all-fiber 2-mode EDFA. The equalizer based on FM-CFBG offers compact size, low insertion loss, and wavelength scalability, making it meaningful for long-haul MDM transmission.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yiwei Qiu, Chenliang Ding, Gangyao Zhan, Mengdi Luo, Jisen Wen, Mengbo Tang, Chun Cao, Wenjie Liu, Liang Xu, Bihu Lv, Dazhao Zhu, Cuifang Kuang, Xu Liu
Summary: This article proposes a novel method to simultaneously reduce the axial and lateral feature sizes of PPI-DLW. By employing a pseudo 3D hollow focus, a suspended nanowire with an isotropic 30-nm feature size was realized, thereby improving the capabilities of PPI-DLW for fabricating arbitrary 3D structures.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Manzhuo Wang, Jianbo Yue, Zhentao Yao, Tingyu Liu, Xiaoqiang Sun, Yuanda Wu, Daming Zhang
Summary: A silica waveguide 1×8 thermo-optic switch consisting of cascaded three-stage Mach-Zehnder interferometers (MZIs) is successfully demonstrated. The switch utilizes a multimode interference (MMI) coupler in the MMI-MZI 1×2 switch unit for its wavelength insensitivity and favorable fabrication tolerance. The switch design and optimization is based on the beam propagation method (BPM) and implemented using standard CMOS technologies. Experimental results show that the switch meets the requirements for insertion loss and crosstalk at 1550 nm wavelength, and also performs well in a wide wavelength range.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
H. M. de la Cruz, E. D. Hernandez-Campos, E. Ortiz-Ricardo, A. Martinez-Borquez, I. Rosas-Roman, V. Contreras, G. Ramos-Ortiz, B. Mendoza-Santoyo, Cecilia I. Zurita-Lopez, R. Castro-Beltran
Summary: Acoustic levitation is an important contactless manipulation technique in various fields. This study presents an affordable phased-array levitator that can stably trap micrometer dye-doped droplets in the air, enabling the creation of microlasers. The levitated microlasers exhibit comparable optical lasing features to On-a-Chip devices, with a maximum Q-factor of approximately 105 and a minimum lasing threshold of approximately 150 nJ cm-2.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yuqi Wang, Zilong Zhang, Suyi Zhao, Wei He, Xiaotian Li, Xin Wang, Yuchen Jie, Changming Zhao
Summary: This paper investigates the impact of localized defects in SLM devices on structured light generation and demonstrates the reconstructed light field results under different defect states using CGH loaded onto the DMD. The results show that central defects have minimal influence on the reconstructed light field, while edge defects have a significant impact. This study expands the application scenarios for the generation of structured light beams with SLM.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ashraf A. A. Beshr, Hossam El-Din Fawzy, Ehab A. A. Eldin, Jong Wan Hu, Fathi A. Abdelmgeed
Summary: This paper introduces the application of digital measuring techniques, specifically Digital Close Range Photogrammetry (DCRP), in the detection of deformation in post-tensioned structural elements (PTSEs). The use of digital equipment and a terrestrial laser scanner (TLS) allows for highly accurate monitoring of PTSE camber, with deviations not exceeding 0.01 mm.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Shihao Gou, Danping Huang, Shipeng Liao, Fan Luo, Yang Yuan, Liang Liu, Xiaomei Wen
Summary: This paper proposes an online intelligent detection method for cable pitch defects in the field of optical cable manufacturing. The method utilizes a multi-sensor fusion image acquisition platform and deep learning technology to achieve accurate detection of pitch defects in optical cables.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Tun-Yao Hung, David W. U. Chan, Ching-Wei Peng, Chi-Wai Chow, Hon Ki Tsang
Summary: We present the first experimental demonstration of a high-capacity short-reach optical communication link which utilizes LSTM and DNN to achieve 300 Gbit/s 8-level pulse amplitude modulation (PAM8) generated by a single microring modulator. The experimental results show that 300 Gbit/s and 270 Gbit/s PAM8 modulation can be achieved at back-to-back and after 1 km transmission respectively.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Long Zhang, Li Pei, Jianshuai Wang, Jingjing Zheng, Kaihua Hu, Zhiqi Li, Tigang Ning, Jing Li, Li Zhong, Ruisi He
Summary: The amplification of long-haul mode division multiplexing (MDM) transmission systems is currently achieved through three steps, which can result in complexity and degraded transmission performance. To address this issue, this paper proposes an in-line few-mode erbium-doped fiber amplifier (FM-EDFA) based on cladding pumping, which enables simultaneous amplification and transmission in MDM systems. Experimental results demonstrate that the in-line FM-EDFA has excellent performance and shows great potential for practical long-haul transmission systems.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Chong Wang, Miaomiao Li, Jiahao Yang, Bingli Zhu, Jianghao Han, Wenbin Dang
Summary: This paper introduces the design of drive circuits using step recovery diodes and RF bipolar transistors to produce narrow pulse lasers, achieving the reduction of system size, power consumption and cost.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ziqian Zhang, Liangyu Zhao, Chaorun Si, Yang Tian, Shilin Xu
Summary: A Hastelloy C276 coating was prepared on a martensitic stainless-steel substrate using laser melting deposition, resulting in a coating with high resistance to cavitation erosion. The coating exhibited a thick, progressively changing grain morphology from bottom to top, and the grains grew in a specific angle to the substrate plane. A compositional mixing zone was formed at the interface, forming a stable metallurgical bond. The coating showed a significantly improved hardness and enhanced resistance to cavitation erosion compared to the substrate.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Cui-Hong Li, Chao-Xiong He, Yuan-Yuan Ma, Jin-Chuan Wang, Ying Dong, Shao-Chong Zhu, Xiao-Wen Gao, Hui-Zhu Hu
Summary: In this paper, a non-contact optical measuring method for characterizing nanoparticles using optical tweezers is presented. The method relies on the optical polarization and scattering of nanoparticles, providing insights into both shape and size parameters. Experimental results show that the method can accurately measure the shape and size of nanoparticles, making it an effective tool for identifying and studying individual nanoparticles.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Magdalena Zieba, Cuma Tyszkiewicz, Katarzyna Wojtasik, Krystian Pavlov, Pawel Chaber, Ewa Gondek, Jacek Niziol, Roman Rogozinski, Pawel Kielan, Pawel Karasinski
Summary: This work presents a study on low-loss waveguide layers for planar evanescent wave sensor applications. Crack-free SiOx:TiOy composite layers with refractive indices of approximately 1.65 were fabricated using a sol-gel method and dip-coating technique. The fabricated layers exhibited good waveguide properties and optical homogeneity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yali He, Jiao Tang, Zhongyang Li, Yaowu Hu
Summary: In this paper, a lithography-free broadband absorbing metasurface consisting of Ag nanoparticles with ultrafine nanogaps is demonstrated. The experimental results and numerical simulations show that the horizontally compressed Ag nanoparticles possess smaller nanogaps for high sensitivity, uniformity, and stability. The novel substrate also exhibits insensitivity to the incident or observation angle in an ambient environment and has promising practical applications.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Linqing Li, Chengwei Yang, Zhuo Wang, Kun Xiao, Rui Min
Summary: In this study, a stretchable polymer optical fiber with a sandwich structure was proposed for sleep monitoring. The fiber improved the pressure sensitivity of the mattress and enabled the measurement of respiratory rate, heart rate, and body motion information.
OPTICS AND LASER TECHNOLOGY
(2024)