Article
Chemistry, Analytical
Long Tian, Tong Ding, Bing Pan
Summary: In this study, a generalized SF calibration model based on a distortion-free pinhole imaging model was proposed for high-quality displacement measurement in off-axis DIC-based video deflectometer. The experimental results demonstrated that under specific conditions, this method can provide more accurate results.
Article
Engineering, Multidisciplinary
Yusheng Wang, Zhixiang Huang, Pengfei Zhu, Rui Zhu, Tianci Hu, Dahai Zhang, Dong Jiang
Summary: Digital image correlation (DIC) accurately measures subpixel displacement field based on speckle images. To address the high data transmission and storage requirements caused by extensive high-resolution images, a framework combining image compression techniques with DIC methods is proposed. The framework reduces the memory footprint of images while preserving the primary speckle features with subpixel errors.
Article
Materials Science, Ceramics
Xuefeng Teng, Shuangqi Lyu, Xiaoan Hu, Yun Jiang, Xiangfan Nie, Xin Liu, Longbiao Li
Summary: This study investigates the deformation response and failure behavior of a plain-woven C/SiC composite under on-axis and off-axis tensile loading. The study highlights the influence of the woven architecture on mechanical properties and strain distribution, and demonstrates that different loading directions result in different failure modes. The width of the off-axis specimen is found to greatly influence the mechanical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Multidisciplinary
Ryan Spencer, Shailesh Alwekar, Eonyeon Jo, Ahmed Arabi Hassen, Seokpum Kim, Uday Vaidya
Summary: A digital image correlation (DIC) nondestructive evaluation (NDE) method has been developed for determining fiber orientation in composite materials. This method measures the strain difference axial and transverse to the fiber axis to determine fiber orientation. Results showed that the strain transverse to the fiber axis was greater than the longitudinal strain, indicating that the fiber direction resists expansion. DIC provides a full-field qualitative measurement with high resolution, and fills the gap/limitations of complementary NDE methods.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Optics
Pavel A. Cheremkhin, Ekaterina A. Kurbatova, Nikolay N. Evtikhiev, Vitaly V. Krasnov, Vladislav G. Rodin, Rostislav S. Starikov
Summary: A digital micromirror device (DMD) is capable of 2D- and 3D-scene reconstruction by displaying diffractive and holographic optical elements, with the highest frame rates achievable through binarization of these elements. Error diffusion is a commonly used implementation for hologram binarization, with various methods available for optically recorded off-axis digital hologram binarization.
Article
Materials Science, Multidisciplinary
Adel Esmaeili, Ehsan Ghane, Bijan Mohammadi
Summary: This study presents a theoretical framework for extracting mixed-mode stress intensity factors and T-stress in off-axis laminated composites using digital image correlation (DIC). The effects of DIC parameters on the accuracy of the experimental results are investigated. Finite element simulation is also utilized to compare and verify the results.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Engineering, Multidisciplinary
Shujun Ma, Yu Luo, Yantao Yu, Shiliang Wang
Summary: This study proposes a numerical method using a patch-based inpainting algorithm to eliminate the tilt and spherical phase aberrations in off-axis digital holographic microscopy. The results from both experiment and simulation show that the proposed method has good robustness and accuracy in phase retrieval.
Article
Chemistry, Multidisciplinary
Xianfeng Xu, Xinwei Wang, Hao Wang
Summary: An approach is proposed to recover and locate the original object image in off-axis digital holography by multiplexing holograms. The recording configuration is designed by introducing an additional plane wave to carry the information of the tilt angle of the reference wave. Theoretical analysis of the intensity distribution in a hologram plane and the spatial spectrum of two sets of holograms in the Fourier domain is conducted. Numerical simulations and optical experiments are performed to demonstrate the feasibility and efficiency of the proposed design.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Yifan Ma, Yazhi Li, Lu Liu
Summary: An experimental method is developed for non-standard off-axis tension tests of unidirectional composites. A new oblique end-tab design eliminates stress concentration and in-plane bending moment induced by off-axis tension loading. Finite element analysis and experiments on PEEK/AS4 unidirectional thermoplastic composites were conducted to evaluate the proposed testing method's effectiveness. Simulation and test results show that the use of oblique end-tabs eliminates stress concentration and bending movements.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
S. Z. H. Shah, P. S. M. Megat-Yusoff, Tahir Sharif, Syed Zahid Hussain, R. S. Choudhry
Summary: This study presents a comparison of off-axis tensile performance between two types of 3D fibre reinforced composites with different matrices. The results show that thermoplastic composites are notch insensitive and have higher failure strains and energy absorption compared to thermoset composites.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Multidisciplinary
John Holmes, Silvano Sommacal, Raj Das, Zbigniew Stachurski, Paul Compston
Summary: This study investigates the deformation response of multi-ply woven composites at different angles by combining digital image correlation (DIC) and 3D micro-computed tomography (mu CT). Significant mechanical property variances and topographical/strain differences were observed between orientations due to layer alignment. Additionally, inter-tow and intra-tow shearing during off-axis extension and corresponding fiber reorientation were identified, highlighting the benefits of combining DIC and mu CT.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Environmental
Jian Xu, Zhipeng Wu, Minghui Zhang, Weihang Ye, Songhe Wang
Summary: Basalt fiber is an effective reinforcement agent for loess engineering, altering the failure mode and mechanical properties of the soil. The fiber content and length affect the strength and deformation of the samples, with the optimal reinforcement effect observed at a fiber content of 0.6% and a fiber length of 12 mm. The distribution uniformity of the fibers is related to the soil strength.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Optics
Naru Yoneda, Yusuke Saita, Takanori Nomura
Summary: Common-path off-axis single-pixel holographic imaging (COSHI) is proposed to obtain complex amplitude information using an in-line interferometer and a single-pixel detector. COSHI is robust to disturbances and requires fewer measurements compared to conventional single-pixel digital holography. The method is theoretically confirmed and numerical and experimental results demonstrate its feasibility.
Article
Mechanics
Anqi Li, Joris J. C. Remmers, Marc G. D. Geers, Thierry J. Massart
Summary: The mechanical response of woven composites under off-axis tensile loading is influenced by damage in the yarn-yarn and yarn-matrix interfaces, causing yarns to rotate and reorient. Updating the material axes during loading is important to achieve realistic results, which can be done using a fiber frame stress rate description or a hyperelastic model. This study reformulates the definition of the fiber frame for woven composites and extends the implementation for an implicit solver in ABAQUS. The simulation results demonstrate a realistic stiffness evolution induced by fiber reorientations compared to the standard ABAQUS implementation.
COMPOSITE STRUCTURES
(2023)
Article
Optics
Huaying Wang, Kunge Li, Xianan Jiang, Jieyu Wang, Xiaolei Zhang, Xu Liu
Summary: In this paper, a preprocessing method based on deep learning is proposed to suppress the main source of noise in the hologram acquisition process - the zero-order image. A generative adversarial network is applied to remove the zero-order image from off-axis digital holograms. The proposed method simplifies data preparation by using simulated data instead of experimental data in training the network. Experimental results demonstrate the successful suppression of zero-order image and high-quality reconstruction of different types of images. This method shows high efficiency and excellent robustness.
OPTICS COMMUNICATIONS
(2023)
Review
Green & Sustainable Science & Technology
Jun Zhou, Lu Wang
Article
Mechanics
Lingfeng Zhang, Weiqing Liu, Lu Wang, Zhibin Ling
COMPOSITE STRUCTURES
(2019)
Review
Green & Sustainable Science & Technology
Wenxian Ma, Chunxiang Yin, Jun Zhou, Lu Wang
Article
Engineering, Chemical
Jian Liu, Kong Yue, Liqin Xu, Jinhao Wu, Zhangjing Chen, Lu Wang, Weiqing Liu, Weidong Lu
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2020)
Article
Engineering, Chemical
Honglei Xie, Li Wan, Bo Wang, Haiping Pei, Weiqing Liu, Kong Yue, Lu Wang
ADVANCES IN POLYMER TECHNOLOGY
(2020)
Article
Construction & Building Technology
Kong Yue, Jinhao Wu, Liqin Xu, Zhongqiu Tang, Zhangjing Chen, Weiqing Liu, Lu Wang
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Forestry
Kong Yue, Xulei Song, Xuekai Jiao, Lu Wang, Chong Jia, Zhangjing Chen, Weiqing Liu
WOOD AND FIBER SCIENCE
(2020)
Article
Engineering, Civil
L. Wang, Y. W. Zhang, J. C. M. Ho, M. H. Lai
ENGINEERING STRUCTURES
(2020)
Article
Mechanics
Yun Zhang, Weiqing Liu, Chunxiang Yin, Yali Ma, Lu Wang
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Construction & Building Technology
Yongwang Zhang, Lu Wang, Li Chen
Summary: This paper proposed an energy-based time equivalent approach (EBTEA) for evaluating the fire resistance of timber components in realistic design fire scenarios, and the validity of the method was verified. The method was further simplified by analyzing key factors of energy equivalence and using nonlinear fitting methods to predict equivalent fire resistance of timber components under realistic design fire scenarios.
STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS
(2021)
Article
Chemistry, Physical
Yongwang Zhang, Lu Wang
Summary: The study focused on the critical conditions and prediction methods of flashover fires in large-space timber structures. Simulations were conducted using the Fire Dynamics Simulator, and a temperature-time model and mathematical formula were established to accurately predict flashover induction time. This research can serve as a reference for performance-based fire safety design of large-space timber structures.
Article
Construction & Building Technology
Hao Zhou, Weidong Lu, Binhui Lu, Lu Wang, Yingwei Bao, Jun Zhang, Zhentao Chen
Summary: Compared to traditional timber boards, timber-concrete composite (TCC) boards have higher rigidity and bearing capacity, improved vibration behavior, and better performance under seismic conditions. However, their combustibility results in charring when exposed to fire, making fire safety of this material essential. In this research, fire exposure tests and residual load-carrying capacity tests were conducted on full-scale composite boards, two of which were protected with an innovative gypsum board. The results showed that the innovative protection effectively improved fire resistance of the TCC boards. Finite element models were also used to study temperature distribution and load-carrying capacity, demonstrating high accuracy and applicability. The findings of this study are valuable for fire design in engineering.
Article
Ecology
Jingsong Huang, Lu Wang
Summary: This paper presents experimental and numerical investigations on the progressive collapse behavior of a two-story glulam frame when exposed to fire. Experimental results show that the failure time of the middle column is 16.8 min, and the time to determine the progressive collapse is 17.17 min. Numerical simulation results agree well with the experimental results, revealing the mechanism of frame collapse due to the catenary effect.
Article
Green & Sustainable Science & Technology
Yun Zhang, Lingfeng Zhang, Zhiwei Shan, Lu Wang, Weiqing Liu
JOURNAL OF RENEWABLE MATERIALS
(2019)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)