Article
Polymer Science
Xian Liu, Linxin Wang, Quantian Luo, Zhonghao Bai, Qing Li, Jian Hu
Summary: This study investigates the applicability of a new formulation involving finite width for predicting the residual properties of laminated plates. Experimental and theoretical analyses were conducted on carbon-fiber-reinforced plastic (CFRP) laminates with different notch shapes and sizes. The results demonstrate the effectiveness of the new formula in evaluating the tensile properties of notched fiber-reinforced laminates and reveal the significant effects of notch size on strength prediction and the influence of fiber direction on fracture mode.
Article
Engineering, Civil
Linhai Huang, Yin Tao, Jin Sun, Diantang Zhang, Junhua Zhao
Summary: In recent years, the low-velocity impact behaviors of carbon/epoxy composite laminates have been extensively studied using various numerical modeling approaches, but the computation accuracies of these approaches have rarely been compared and reported. To explore a high-precision modeling approach, a numerical study was conducted to compare the effects of different failure criteria, evolution methods, and interface models. The results indicate that the impact responses of the material are more influenced by the evolution methods rather than the failure criteria, and the numerical results using the Puck criterion, linear evolution method, and finite-thickness cohesive elements are in the best agreement with the experimental data.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Composites
Jing Ye, Yan Gao, Yushan Wu, Cheng Liu, Jiale Dong, Huan Wang, Bo Su, Hua-Xin Peng
Summary: A new method called nano-scale electrochemical sculpture (NES) has been developed to enhance the bonding strength of fiber metal laminates (FMLs-NES). Through systematic investigation and comparison with traditional surface treatments, it has been found that FMLs-NES exhibits the smallest damage area and energy absorption, while maintaining structural integrity after impact. Finite element simulations have also provided insights into the impact damage progression and failure mechanisms, and the validated finite element model can be used to optimize the stacking sequence and predict residual strength after impact.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Lunan Wei, Jun Chen
Summary: This study presented an integrated three-dimensional finite element model for imaging barely visible impact damage (BVID) in carbon fiber reinforced plastic using pre-modulated wave technique. The proposed numerical methodology was experimentally validated and the severity of damage was quantified based on vibration measurements. The results showed that this approach could accurately identify the location of BVID and evaluate its severity.
COMPOSITE STRUCTURES
(2023)
Article
Acoustics
Zhenhua Chen, Guochen Xu, Lu Wei, Chenggeng Li, Lu Chao
Summary: A new nonlinear Lamb wave imaging method for detecting Barely Visible Impact Damage (BVID) in Carbon Fiber Reinforced Polymer (CFRP) laminates is proposed in this study. The research results indicate that the Damage Index (DI) based on the relative non-linear coefficient has higher detection sensitivity for low-energy impact damage, and the new method can display the BVID and the extension of macro damage intuitively.
Article
Chemistry, Physical
Yansong Zhu, Yueke Ming, Ben Wang, Yugang Duan, Hong Xiao, Chenping Zhang, Jinru Sun, Xiangyu Tian
Summary: This paper investigates the impact of lightning damage on carbon-fiber-reinforced polymers (CFRPs) and finds that increasing material thickness can mitigate damage, while increasing the conductivity in the vertical fiber direction can reduce damage in the fiber direction. Thickness and conductivity in the fiber direction are important considerations in structural design. Additionally, increasing the thermal conductivity along the fiber direction can accelerate the heat dissipation process after a lightning strike.
Article
Materials Science, Composites
J. L. Liu, J. Zhi, H. L. Wong, E. S. Sugeng, T. E. Tay, V. B. C. Tan
Summary: The effect of ply blocking on high-speed impact of CFRP laminates is investigated. It is found that ply blocking significantly affects the ballistic limit and modes of damage. As the level of ply blocking increases, resistance to fiber damage increases but it becomes easier for projectiles to slip through between fibers. A new laminate layup is designed to mitigate the effects of ply blocking.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Naidan Hou, Renxi Zhao, Jian Li, Xuan Wang, Xi Li, Hao Cui, Yulong Li
Summary: This study investigates the damage caused by rain erosion on aircraft during supersonic flight through high-speed waterjet impact experiments on composite laminates. The experiment and simulation results confirm the effectiveness of the numerical methods used. The study finds that water-hammer pressure, stagnation pressure, and stress wave propagation are the main failure mechanisms for matrix damage in CFRP impacted by waterjets. The velocity and diameter of the waterjets are crucial factors affecting the extent of damage on CFRP.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Mechanics
Yu Gong, Xinjian Chen, Wangchang Li, Libin Zhao, Junan Tao, Jianyu Zhang, Ning Hu
Summary: The effects of stacking sequence on the R-curve and traction-separation relation in unidirectional and multidirectional CFRP DCB laminates were systematically investigated, showing strong influence on fiber bridging length, steady-state fracture toughness, and maximum bridging stress. However, there was no clear relationship between these factors and the stacking sequence. The obtained traction-separation relations were successfully integrated into a tri-linear cohesive zone model and numerical results agreed well with test results, demonstrating applicability for delamination modeling in composite laminates with fiber bridging effects.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Evren Sonat, Sezer Ozerinc
Summary: The study shows that increasing scarf angle reduces the tensile strength of the repaired composite structures, resulting in different types of failure. Finite element analysis using cohesive zone modeling accurately predicts the experimentally observed response, with stress concentration distribution over the bonding area playing a crucial role in determining the failure type. Further investigation reveals that adhesive defects can significantly decrease the strength of the bonded specimens.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Yinyuan Huang, Felix Thompson EShun, Junfeng Hu, Xutong Zhang, Jianping Zhao, Siqi Zhang, Rui Qian, Zhou Chen, Dingding Chen
Summary: This study investigates the low-velocity impact response of continuous CFRP and UACS laminates with vertical slits under drop-weight impact. The results show that the delamination damage of UACS laminates increases with the increase of impact energy. Moreover, compared to continuous CFRP laminates, UACS laminates have an approximately 80% increase in energy absorption at 7 J.
Article
Materials Science, Composites
Johannes Reiner, Navid Zobeiry, Reza Vaziri
Summary: A simple and efficient finite element modelling approach is presented for simulating the residual strength of carbon fiber reinforced composite laminates after impact, with results showing reasonable predictions for different laminate structures and errors ranging from 10% to 30%.
COMPOSITES COMMUNICATIONS
(2021)
Article
Mechanics
Congzhe Wang, Anastasios P. Vassilopoulos, Thomas Keller
Summary: This study numerically investigated the two-dimensional delamination growth in FRP laminates under Mode I loading condition using finite element analyses. The results showed that flatter pre-crack or loading zone shapes could result in higher initial structural stiffness and less uniform distribution of the strain energy release rate along the pre-crack perimeter. The final crack shape was dependent on the loading zone shape and area, but the effects were relatively weak.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Civil
Qihui Lyu, Ben Wang, Zhenqiang Zhao, Zaoyang Guo
Summary: This study explores the impact of carbon/glass hybrid laminates' stacking sequences on the impact resistance and damage tolerances of fiber-reinforced composites. Through various tests, the study compares conventional non-hybrid laminates with carbon-fiber-reinforced plastic and glass-fiber-reinforced plastic to different configurations of carbon/glass hybrid laminates. The study also proposes an integrated computational damage model that predicts the impact damage and residual compressive strength of the different configurations of hybrid laminates. The results demonstrate that carbon/glass hybrid laminates exhibit excellent impact resistance and residual compressive strengths due to the hybrid synergistic effects. Additionally, the validated integrated finite element model enables the optimized design of carbon/glass composite laminates with different configurations, providing valuable guidance for future engineering applications.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Danhui Yang, Viska Wei, Zeren Jin, Zhibo Yang, Xuefeng Chen
Summary: In this study, a novel multi-scale damage model based on the parametric finite-volume direct averaging micromechanics theory, extended finite element method, and clustering algorithm is proposed. The model utilizes a specially designed clustering method based on manifold approximation and projection to group unit cell subvolumes with similar mechanical responses. The clustered unit cell is then combined with XFEM to enable the transmission of damage information between different scales. The model considers three damage mechanisms of laminates and incorporates a shear nonlinear matrix to capture the unique nonlinear behavior of laminates. Experimental results and simulations demonstrate the effectiveness of the proposed model.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Nanoscience & Nanotechnology
Junfeng Cui, Liang Ma, Guoxin Chen, Nan Jiang, Peiling Ke, Yingying Yang, Shiliang Wang, Kazuhito Nishimura, Javier Llorca
Summary: This article reports the abnormal phenomenon that twin boundaries weaken the strength of body-centered cubic (BCC) tungsten. [1-11]-oriented W nanowires with (121) twin planes and free of dislocations were fabricated, and in situ tensile tests were performed. The fracture strength of the twinned W nanowire was found to be 13.7 GPa, 16% lower than that of the single-crystal W nanowire (16.3 GPa). The weakening mechanism was revealed to be the early nucleation of a crack at the intersection of the twin boundary with the surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
David Aveiga, David Garoz Gomez, Davide Mocerino, Bernardo Lopez-Romano, Carlos Gonzalez
Summary: This study analyzes the ply-ply and ply-tool friction coefficients for UD AS4/8552 Carbon/Epoxy prepreg. A pull-out test method was employed to determine the friction coefficients at different velocities, pressures, and temperatures related to the thermoforming process conditions, providing a detailed report of friction parameters and mechanisms. Using the Lubrication Theory approach, an analytical model was developed based on the Stribeck curve and Reynolds equation, accurately predicting friction coefficients for prepreg composite materials in the mentioned process and contact conditions.
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: A dual-textured Mg-6.5 Zn alloy with limited yield asymmetry is studied. The deformation mechanisms responsible for the behavior are analyzed and it is found that compressive deformation is accommodated by basal slip and extension twinning, while tensile deformation promotes basal and nonbasal slip. The contribution of rotated grains leads to similar values of the yield strength in tension and compression.
Article
Engineering, Mechanical
Mingdi Yu, Yuchi Cui, Jingya Wang, Yiwen Chen, Zhigang Ding, Tao Ying, Javier Llorca, Xiaoqin Zeng
Summary: The presence of Y and Ca in a magnesium-based alloy led to a significant increase in the critical resolved shear stress (CRSS) for different deformation mechanisms, including basal slip, pyramidal slip, and tensile twin nucleation. This change in CRSS altered the dominant deformation mechanisms in polycrystals, replacing tensile twinning with prismatic slip during compressive deformation. The reduction of twinning and the activation of prismatic slip were responsible for the high tensile ductility of the alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Review
Chemistry, Physical
Antonio Vazquez-Lopez, Xiang Ao, Jose Sanchez del Rio Saez, De-Yi Wang
Summary: Currently, the high concentration of particulate matter (PMs) in the air poses a growing hazard to human health. The use of triboelectric nanogenerators (TENGs) has emerged as a useful technology for filtering PMs with potentially low environmental impact. This review summarizes the advancements and effectiveness of TENGs in triboelectric air filters (TAFs) and face mask systems (TFMs) against PMs, bacteria, and viruses, and discusses prospects, environmental concerns, and potential challenges.
Article
Chemistry, Multidisciplinary
Antonio Vazquez-Lopez, Jose Sanchez del Rio Saez, Jimena de la Vega, Xiang Ao, De-Yi Wang
Summary: Since the COVID-19 pandemic, face masks have become mandatory in many countries and an effective approach to combat the virus. Triboelectric nano-generators (TENGs) have been proposed for designing effective face masks with novel functionalities. This study introduces the use of an all-fabric TENG made of high molecular weight polyethylene (UHMWPE) and cotton fabric for detecting breath and triggering alarms. The study also demonstrates the remote transmission of breathing signals and anomaly warnings via Wi-Fi and LoRa.
Article
Materials Science, Composites
Junchen Xiao, Jose Hobson, Arnab Ghosh, Maciej Haranczyk, De-Yi Wang
Summary: With the increasing practical applications of polymeric materials, there is a surging demand for high-performance flame-retardant polymer composites. Machine learning models based on the Random Forest algorithm were developed to accurately predict the performance of flame-retardant materials. The models achieved high accuracy in predicting important flame-retardancy-evaluating parameters and revealed the complex influence of feature groups on target properties.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Biomedical
Sasa Kovacevic, Wahaaj Ali, Emilio Martinez-Paneda, Javier LLorca
Summary: A phase-field model is developed to simulate the corrosion of Mg alloys in body fluids, capturing both uniform and pitting corrosion. The model takes into account the synergistic effect of aggressive environments and mechanical loading in accelerating corrosion kinetics. It has the potential to assess the service life and optimize the design of Mg-based biomedical devices, promoting the development of Mg alloys as biodegradable implant materials.
ACTA BIOMATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Wei Shao, Jose Manuel Guevara-Vela, Antonio Fernandez-Caballero, Sha Liu, Javier LLorca
Summary: The solid-state region of the Ni-Al phase diagram is predicted accurately by combining first-principles calculations and Monte Carlo simulations. The computed phase diagram agrees well with the experimental phase diagram and provides additional information about the phase boundary between AlNi3 and Ni below 300 K. The study also analyzes the individual contributions of vibrational entropy and magnetic effects to the stability and solubility of different phases.
Article
Mechanics
Spyridon Psarras, Raul Munoz, Mazdak Ghajari
Summary: This study investigates the damage tolerance of carbon fibre reinforced polymer plates used in aircraft fuselage under multi-site impacts. A new fixture and compression-after-impact rig were designed for sequential low-velocity impacts on plates with different thicknesses. Experimental results show that multi-site impacts decrease the residual strength of thin plates but not thick plates. A finite element model explains the difference and suggests that the buckled shape prior to failure is changed by the second impact in thin plates.
COMPOSITE STRUCTURES
(2023)
Article
Polymer Science
Yu-Yao Liu, Juan Pedro Fernandez Blazquez, Guang-Zhong Yin, De-Yi Wang, Javier Llorca, Monica Echeverry-Rendon
Summary: This study presents a strategy for manufacturing biodegradable and biocompatible 3D printable biomaterials with tunable mechanical properties and degradation rate for tissue regeneration scaffolds. The PCEC copolymers synthesized in this study showed tunable mechanical properties and degradation rate, as well as excellent cytocompatibility and cell attachment. It was also demonstrated that PCEC scaffolds with excellent dimensional accuracy and controlled microporosity can be manufactured using 3D printing.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Agricultural Engineering
Xiaolu Li, Jose Sanchez del Rio Saez, Antonio Vazquez-Lopez, Xiang Ao, Raquel Sanchez Diaz, De-Yi Wang
Summary: This study proposes a strategy for fabricating wallpaper-based smart fire-warning systems using eco-friendly cellulose paper. The system is produced through a simple dip-coating technique and offers flexibility, rapid low-temperature warning, and novel local and remote wireless signal conversion capability. The system balances flexibility and flame retardancy, provides fast low-temperature warning within 2 seconds under 250 degrees C, and allows for wireless transmission of collected luminosity and temperature data to local and remote computers. This work contributes to the development of low-temperature smart fire-warning systems with wireless warning signal transmission for smart and efficient fire detection.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Materials Science, Composites
Xiang Ao, Junchen Xiao, Jose Hobson, Jimena de la Vega, Guangzhong Yin, Maria Luisa Puertas Cuadron, Antonio Esteban Cubillo, Carlos Gonzalez, De-Yi Wang
Summary: This study investigates the use of a bilayer protective coating to enhance the fire safety and post-fire mechanical properties of fiber-reinforced polymer composites (FRPs). The results show that the bilayer coating can delay the decomposition of the polymer matrix, while also providing good thermal insulation capabilities and retaining the original tensile strength.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Miguel Hernandez-del-Valle, Christina Schenk, Lucia Echevarria-Pastrana, Burcu Ozdemir, Enrique Dios-Lazaro, Jorge Ilarraza-Zuazo, De-Yi Wang, Maciej Haranczyk
Summary: This article presents an automated robotized workflow for producing test specimens of new thermoplastic polymers using 3D printing and evaluating their mechanical properties through the Charpy impact test. The workflow involves pellet-based 3D printers, a collaborative robot manipulator, a balance and camera vision system, and an automated impact tester instrument. Two approaches, design of experiment and Bayesian optimization, are investigated to control the workflow and identify acceptable 3D print parameters.
