Article
Materials Science, Multidisciplinary
Zhen Yang, You Shuai, Yiqiang Kang, Shichun Zhan, Yang Li
Summary: In this study, the influence of slit tube diameter on crack propagation was explored using the transmission explosive dynamic caustics experiment method. The experiments were conducted on PMMA specimens with the slit cartridge explosion loading. The results showed a positive relationship between the diameter of the shaped charge tube and the length of the directional crack, peak value of dynamic stress intensity factor, peak value of directional crack growth speed, area of the crushing zone, and fractal dimension of box counting.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Physics, Applied
S. M. Torres, O. Y. Vorobiev, R. E. Robey, M. J. Hargather
Summary: This study investigates the fracture response of geologic materials under explosive loading using a transparent rock surrogate, PMMA. High-speed imaging and PDV were used to capture the shock propagation and fracture growth processes. The experimental results were compared to numerical simulations, showing good agreement in fracture lengths. The simulation analysis revealed that the shock drives the fracture for approximately 20 μs.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Mechanical
Chengxiao Li, Yiqiang Kang, Yuantong Zhang, Haohao Luo
Summary: This paper investigates the crack propagation behavior of a polymethyl methacrylate plate with double holes under explosive load using a new digital laser dynamic caustics system. The interaction process between the explosion stress wave and the empty hole reflected stress wave is analyzed, as well as the deflection law of the explosion crack. The relationship between the propagation distance, velocity, stress intensity factor of the explosion crack tip, and the distance between the two holes is also discussed. Additionally, numerical simulations are used to analyze the explosion process and obtain the time-varying law of the stress between the double holes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Chenglong Xiao, Renshu Yang, Jinjing Zuo, Jun Chen, Jie Zhao, Yi Yang
Summary: In order to investigate the effect of open joint on blasting damage and crack propagation, plexiglass (PMMA) specimens with open joints were studied using a digital laser dynamic caustic experimental system. The results revealed that the crack was unable to pass through the open joint, but the joint could facilitate the destruction of the medium between the borehole and the joint. Due to the impact of the reflected stress wave at the joint, the crack was no longer subjected to pure tensile stress but experienced a combined effect of tensile and shear stress. This resulted in a change in the fracture type of the crack from Type I to mixed types I and II. During the stage of reflected stress wave, the crack growth rate and intensity factor of dynamic stress increased.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Mingyuan Zhang, Liu Yang, Zhengyan Zhang, Longfei Chang, Haonan Zhu, Yingjun Li
Summary: This paper studies the influence of layer structures on the crack propagation behavior of shale. Experimental tests and quantitative analysis reveal a linear relationship between the energy release rate and crack propagation rate. The results also indicate that symmetric loading does not result in significant angle localization during crack propagation, suggesting that crack propagation behavior in shale is influenced by the interplay between energy release rates and fracture resistance.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Characterization & Testing
Yaodong Xue, Yongfeng Cheng, Qing Li, Weisheng Du, Wenlong Xu
Summary: This paper investigates the dynamic stress intensity factor (DSIF) at the crack tip of a PMMA beam with an internal offset crack under impact loading. The stress intensity factor and velocity of the mixed-mode crack tip under static and dynamic loading were derived using the transmission caustic method. Drop hammer loading tests were conducted on different specimens with biased cracks in the beam to obtain dynamic fracture mechanics parameters. The crack initiation angle and expansion path of impact-generated expansion cracks were analyzed based on theoretical analysis, and the differences between the fracture process and specimens containing internal symmetric cracks were discussed.
Article
Engineering, Mechanical
Lei Wang, Zheming Zhu, Lei Zhou, Weiting Gao, Yuqing Dong, Caoyuan Niu, Ting Ai
Summary: Dynamic experiments with a circular opening specimen model revealed that the incline angle of the circular hole has a significant impact on crack propagation trajectories and speeds, as well as the characteristics of dynamic fracture toughness during crack propagation.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Linzhi Peng, Zhongwen Yue, Xiaolei Yue, Jingsong Liu, Yaxu Qiao, Cuigang Chen, Shengnan Xu, Peng Qiu
Summary: In this experiment, strain gages and dynamic caustics were used to measure the V-notch crack initiation toughness and propagation toughness of PMMA specimens. The results obtained from strain gage measurement were consistent with those calculated using the dynamic caustics method. The experimental results showed that the V-notch crack initiation was inhibited more with larger opening angles, leading to longer crack initiation time and instantaneous cracking, while the crack propagation velocity and propagation toughness were also affected by the opening angle of the V-notch crack.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Aerospace
Siddarth Niranjan Babu, George A. Kardomateas
Summary: This paper presents closed-form expressions for the energy release rate and mode partitioning of face/core debonds in sandwich composites with orthotropic faces and core, by use of an elastic foundation analysis. The results are compared with finite element results and show very good agreement, demonstrating the effectiveness of the proposed method in capturing the behavior of debonds in sandwich composites.
Article
Materials Science, Multidisciplinary
Zhongwen Yue, Xu Wang, Peng Qiu, Linzhi Peng, Jun Zhou, Akang Li
Summary: In this study, directional fracture controlled blasting experiments were conducted on PMMA specimens using high-speed camera and optical caustics method. The effects of crack overlaps on fracture parameters were investigated, showing a sudden rise in crack velocity and mode I stress intensity factor during crack interaction. Furthermore, the variations of mode II stress intensity factors were found to be more complex, with three loading regimes observed. The study also identified an appropriate ratio of crack offset distance/horizontal distance for apparent mixed mode failure in crack overlaps.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Mechanics
Chenglong Xiao, Shuai You, Yuanyuan You
Summary: In this study, a plexiglass (PMMA) specimen was designed for dynamic impact testing using a digital laser dynamic caustics experimental system. The effect of offset distance on the dynamic fracture behavior of PMMA specimens with semicircular arc pre-cracks in two different directions was investigated. It was found that the pre-crack initiates anew when the horizontal distance between the moving crack and the semicircular arc pre-crack is small. With increasing horizontal distance, the pre-crack attracts and then repels the crack. When the distance reaches a critical threshold, the pre-crack has no significant effect on the moving crack. The conclusions are not affected by the direction of the semicircular arc pre-crack. Additionally, the crack deflection angle and horizontal offset distance follow a linear function.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Huizhen Liu, Liyun Yang, Enguang Yang, Renshu Yang
Summary: This study investigated the effects of stress waves on dynamic cracks through numerical simulation and experimental research. The results indicate that the pre-crack exhibits obvious characteristics of pure mode I crack propagation under the action of symmetrical reflected tensile waves, while the compressive stress wave has little influence on crack propagation.
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
(2023)
Article
Mechanics
Peng Xu, Renshu Yang, Yang Guo, Cheng Chen, Yang Yang, Jinjing Zuo
Summary: The interaction between cracks significantly influences the stress intensity factors and crack velocities, as well as the fracture behaviors. During crack interactions, cracks may transition from tensile to mixed tensile-shear fracture conditions, leading to changes in crack propagation direction.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Xiongwen Jiang, Wei Zhang, Dacheng Li, Tuo Chen, Yu Tang, Zitao Guo
Summary: The research on the impact of different damage cracks caused by underwater explosions on the residual capacity and dynamic response of liquid cabins is crucial for improving the design of cabin structures and the development of fluid-solid coupling theory. Experimental results indicate that in the dynamic response of thin-walled plates, the growth of cracks and bulging height do not synchronize, and the effects of crack shape and size on bulging and crack growth are attributed to the trade-off between energy leakage and bending stiffness of the target plate.
THIN-WALLED STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Chengxiao Li, Renshu Yang, Yuantong Zhang, Haohao Luo, Chen An
Summary: The study on single hole and double hole specimens using PMMA material revealed that smaller S and larger r would have a more obvious attraction to cracks in single-hole specimens; whereas the variation of S/r and r parameters in double-hole specimens had different effects on cracks.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Optics
Yin Xiao, Lina Zhou, Wen Chen
Summary: This paper introduces a correspondence imaging approach for reconstructing high-quality objects through complex scattering media. By deriving a rectified theory and introducing temporal correction, the proposed method eliminates the effect of dynamic scaling factors. Experimental results demonstrate the advantages of the proposed method over conventional methods in complex scattering environments, and it can also be combined with other methods to further enhance the quality of reconstructed objects.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zengxuan Jiang, Minghao Chao, Qingsong Liu, Bo Cheng, Guofeng Song, Jietao Liu
Summary: In this paper, a multi-focal metalens with high focusing efficiency controlled by circular polarization multiplexing is demonstrated. The metalens can generate four transversely distributed focal points under normal incidence of linearly polarized light, supporting both left-circularly polarized and right-circularly polarized conversion. Furthermore, an oblique incidence metalens is designed to achieve high total focusing efficiency for terahertz waves and provides potential new applications for polarization imaging and detection.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yiran Wang, Yu Ji, Xuyang Zhou, Xiu Wen, Yutong Li, Zhengjun Liu, Shutian Liu
Summary: This work presents a new reconstruction framework for structured illumination microscopy (SIM), which only requires four raw images and avoids extensive iterative computation. By using checkerboard pattern illumination modulation instead of sinusoidal fringe illumination, the proposed method significantly reduces image acquisition time and achieves higher image reconstruction rate. Additionally, the reconstruction process is non-iterative and not limited by the field of view size.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qian He, Li Pei, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li
Summary: This paper proposes a 3D refractive index profile visualization method to demonstrate mode activation and evolution in fiber fusion splicing. The method is validated through experimental results and provides support for various fiber splicing operations and mode coupling modulation.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Qiwei Li, Qiyu Wang, Fang Lu, Yang Cao, Xu Zhao
Summary: LSHIP is a lenslet-array-based snapshot hyperspectral imaging polarimeter that combines spectral polarization modulation with integral field imaging spectrometry. It can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Huicong Li, Bing Lv, Meng Tian, Wenzhu Huang, Wentao Zhang
Summary: This study proposes a temperature compensation scheme for unbalanced interferometers using sensing fibers with different temperature coefficients, aiming to resolve the temperature disturbance and achieve high strain resolution. The experimental results confirm the effectiveness of the proposed scheme in high-resolution, long-term, low-frequency, and static strain sensing.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hongxiang Chang, Rongtao Su, Yuqiu Zhang, Bowang Shu, Jinhu Long, Jinyong Leng, Pu Zhou
Summary: High-speed variable-focus optics provides new opportunities for fiber laser applications in various fields. This paper investigates a non-mechanical axial focus tuning method using coherent beam combining (CBC) technique and proposes a tilt modulation assisted method to extend the tuning range.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Yubo Ni, Shuai Fu, Chaoyang Su, Zhaozong Meng, Nan Gao, Zonghua Zhang
Summary: This paper proposes a surface adaptive fringe pattern generation method to accurately measure specular surfaces, eliminating the out-of-focus effect and improving measurement accuracy and reliability.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Zifan Wang, Tianfeng Zhou, Qian Yu, Zihao Zeng, Xibin Wang, Junjian Hu, Jiyong Zeng
Summary: Fast-axis collimation (FAC) lens arrays are crucial in laser systems, and their precision can be improved through the development of an optical collimation system and the use of thermal compensation to correct for non-uniform thermal expansion.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Jincheng Chen, Qiuyu Fang, Li Huang, Xin Ye, Luhong Jin, Heng Zhang, Yinqian Luo, Min Zhu, Luhao Zhang, Baohua Ji, Xiang Tian, Yingke Xu
Summary: This study developed a novel deep learning accelerated SRRF method that enables super-resolution reconstruction with only 5 low SNR images, and allows real-time visualization of microtubule dynamics and interactions with CCPs.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Pan Liu, Yongqiang Zhao, Ning Li, Kai Feng, Seong G. Kong, Chaolong Tang
Summary: This article presents a technique for inverse design of multilayer deep-etched gratings (MDEG) using a deep neural network with adaptive solution space. The proposed method trains a deep neural network to predict the probability distribution across the discretized space, enabling evaluation of an optimal solution. The results show improved efficiencies using only a reduced dataset and avoiding one-to-many mapping challenges.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Evelina Bibikova, Nazar Al-wassiti, Nataliya Kundikova
Summary: Light beams possess three types of angular momentum, namely spin angular momentum, extrinsic orbital angular momentum, and intrinsic orbital angular momentum. The interaction between these momenta leads to the spin-orbit interaction of light and topological effects. This study predicts a new topological effect resulting from the influence of extrinsic orbital angular momentum on spin angular momentum in converging asymmetrical light beams. It manifests as the transformation of linear polarized light into elliptically polarized light when an asymmetrical beam passes through the left or right half of the focal plane. The measured value of the topological circular amplitude anisotropy R was found to be R = +/- (0.60 +/- 0.08) x 10(-3). This new effect contributes to our understanding of light and has potential applications in developing sensors in optics.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Hamdy H. Wahba
Summary: This study combines multiple-beam Fizeau interference and single-shot digital holographic interferometry to study thick phase objects. By collecting optical phase at different focal planes, the angular spectrum method is used for the first time to retrieve optical phase maps through the focal depth. The proposed method proves to be effective in providing accurate numerical focusing and phase maps reconstruction.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Mohammed A. Isa, Richard Leach, David Branson, Samanta Piano
Summary: Due to the complexity of resolving object form and pose in images, new vision algorithms prioritize identification and perception over accurate coordinate measurement. However, the use of planar targets for coordinate measurement in vision systems has several drawbacks, including calibration difficulties and limited viewing angles. On the other hand, the use of sphere targets is infrequent in vision-based coordinate metrology due to the lack of efficient multi-view vision algorithms for accurate sphere measurements.
OPTICS AND LASERS IN ENGINEERING
(2024)
Article
Optics
Ildar Rakhmatulin, Donald Risbridger, Richard M. Carter, M. J. Daniel Esser, Mustafa Suphi Erden
Summary: This paper reviews the application of machine learning in laser systems. While machine learning has been widely used in general control automation and adjustment tasks, its application in specific tasks requiring skilled workforces for high-precision equipment assembly and adjustment is still limited. The paper presents promising research directions for using machine learning in mirror positional adjustment, triangulation, and optimal laser parameter selection, based on the recommendations of PRISMA.
OPTICS AND LASERS IN ENGINEERING
(2024)