Article
Mathematics, Applied
Tatyana S. Petrova, Elisaveta G. Kirilova, Wilfried Becker, Jordanka A. Ivanova
Summary: This study presents an analytical modeling of the behavior of graphene/PMMA nanocomposites under hygrothermomechanical loading. The results demonstrate that the stresses in the structure vary under different loading conditions, and the possibility of interface delamination is investigated.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Engineering, Manufacturing
Hamed Fallahi, Ozge Kaynan, Amir Asadi
Summary: This study experimentally investigates the influence of the fiber-matrix interphase on the fracture toughness of fiber-reinforced composites. The width and chemical properties of the interphase zone are found to significantly affect the interfacial strength. By modifying the fiber surface with nanoparticles, the interfacial strength is improved by 76%, resulting in a more effective contribution of the matrix during fracture. This stronger interphase leads to a 183% improvement in mode I and 75% improvement in mode II interlaminar fracture toughness of the composite.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
Chunlei Song, Xiaoliang Jin
Summary: This paper presents an analytical prediction method for CFRP chip formation mode based on stress state, and validates the prediction results through orthogonal cutting experiments.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Mechanics
Koichi Mizukami, Kentaro Abe, Takehito Senga, Keiji Ogi
Summary: In this paper, a locally resonant sandwich metamaterial beam with inertial amplification mechanisms is proposed for flexural vibration attenuation. Analytical equations of motion are derived using Hamilton's principle and analytical solutions for the stopband boundary frequencies are obtained. Finite element analyses and experiments confirm the frequency response of the sandwich beam and validate the analytical solutions.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Kangkang Wang, Libin Zhao, Meijuan Shan, Haiming Hong, Jianyu Zhang
Summary: Compared to static conditions, predicting fatigue damage of delaminated composites is more challenging due to the gradual reduction in mechanical characteristics and delamination propagation, leading to catastrophic failure. A semi-analytical model was developed based on residual stiffness theory and brittle damage mechanics to evaluate failure behaviors of delaminated composites under fatigue loadings. The model included a stiffness degradation model, a residual strength model, and a failure evaluation criterion. Experimental tests validated the effectiveness and accuracy of the model. The proposed model provides important guidance for the safety design of delaminated composites under fatigue loadings.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Philipp Hahn, Harichandana Channammagari, Mathieu Imbert, Michael May
Summary: This paper presents a novel high-rate transverse crack tension (TCT) test for determining mode II fracture toughness under high strain rates. The results show that the fracture toughness of the tested composite under high-rate loading is at least 50% higher compared to quasi-static loading.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Composites
Yun Wan, Changfu Tang, Zhiyuan Jiang, Fangxin Wang, Chaojie Hu, Bin Yang
Summary: This paper investigates the application of shape memory alloy (SMA) in carbon fiber-reinforced polymer (CFRP) T-shape structures. Through tensile tests, the enhancing laws and reinforcement mechanisms are revealed. The roles of SMA in adhesive repair of permanent damage in T-joints are analyzed. Overall, SMA's advantages of super-elasticity and shape memory are utilized to improve the mechanical properties and adhesive repair of CFRP T-joints.
COMPOSITES COMMUNICATIONS
(2023)
Article
Materials Science, Composites
Qing-Qing Ni, Jun Hong, Ping Xu, Zhenzhen Xu, Kirill Khvostunkov, Hong Xia
Summary: This study proposed a new nondestructive testing method EMW-NDT using electromagnetic wave technique, showing good detection sensitivity to damages such as delamination size and thickness in CFRP composites. With huge potential, this contactless method could be widely used in the field of damage detection for CFRP composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
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
Engineering, Mechanical
Yu Gao, Shiyang Zhu, Huiming Ding, Xiaowen Song, Huanyi Hu, Han Wang, Yinglin Ke
Summary: As ultra-thick laminates are extensively used in aerospace and marine applications, understanding the effect of thickness on their compressive properties is crucial. This study investigates the influence of parameters such as fiber volume fraction, fiber waviness, void content, and free edge effect on the compressive strength of ultra-thick laminates. The results indicate that the fiber volume fraction remains relatively unchanged with increasing thickness, while fiber waviness, void content, and free edge stress significantly influence the compressive strength. Furthermore, the study proposes an empirical relationship between compressive strength and thickness, providing important theoretical and experimental references for the design of ultra-thick composite structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Composites
Ali Akbar Baharali, Ali Amin Yazdi
Summary: This study investigates the effect of carbon nano-tubes and fiber carbons on vibration frequency of delaminated anti-symmetric cross-ply cylindrical shells. By using a mixture of rule and Halpin-Tsai relation to obtain effective materials and presenting an approximate-analytical solution based on Galerkine's method, the study aims to assess the impact of various parameters on frequency ratio for CNTs reinforced anti-symmetric cross-ply delaminated composite cylindrical shells.
POLYMER COMPOSITES
(2021)
Article
Mechanics
C. Blondeau, G. A. Pappas, J. Botsis
Summary: The study found that monotonic and fatigue delamination of CP004 material showed similarities, with smooth crack growth and significant bridging, while SE-84 material exhibited different phenomena, with no bridging but matrix cohesive failure occurring under monotonic load.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Luohuan Zou, Yu Gong, Dingli Tian, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: Delamination behavior in multidirectional laminates is affected by interface angle, and investigating the effect of interface angle on delamination behavior is crucial for practical engineering. This study analyzes the effects of interface angle on the R-curve, bridging stress, and failure mechanism through experiments and numerical simulations.
THIN-WALLED STRUCTURES
(2023)
Article
Construction & Building Technology
Laurent Michel, Emmanuel Ferrier
Summary: Through experimental investigation and analytical verification, it is concluded that the use of FRP laminates on prestressed concrete joists significantly increases the response of the beams.
STRUCTURAL CONCRETE
(2022)
Article
Chemistry, Physical
Moustafa Kinawy, Felice Rubino, Giacomo Canale, Roberto Citarella, Richard Butler
Summary: Sandwich panels with composite laminate skins were tested for impact damage induced at low energy, with different failure behaviors observed in panels oriented transversally and parallel to the compressive load. Physical and visual analysis, as well as numerical simulations, were utilized to predict the local buckling failure mode and static strength of the laminate structures. The results of the tests correlated well with the analytical and numerical models.
Article
Materials Science, Multidisciplinary
Yu-Zhou Wang, Li Ma
Summary: This study investigates the acoustic performance and sound insulation applications of cylindrical sandwich structures. The theoretical model is established using the space-harmonic expansion method and the principle of virtual work, taking into account the vibro-acoustic coupling. The influence of various parameters on sound transmission loss is analyzed using both theoretical and finite element models.
ACTA MECHANICA SOLIDA SINICA
(2022)
Article
Engineering, Mechanical
Shaowei Zhu, Bing Wang, Liming Chen, Xiaojun Tan, Li Ma
Summary: This study introduces a new design strategy to improve the energy dissipation ability of parallel structures by combining multiple ST-NSS cells in parallel with a phase-differences mechanism. Experimental results verify that this strategy significantly enhances the energy dissipation ability of parallel structures and limiting the displacement range further improves this ability.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Aerospace
Ge Qi, Li Ma, Mayara Bortolotti Rossini, Kai-Uwe Schroeder
Summary: A novel satellite structure concept with composite lattice truss core sandwich panels is proposed in this investigation. Vibration tests and finite element analysis are conducted to determine the dynamic responses of the satellite structure, showing significant mass reduction and rapid assembly potential.
Article
Mechanics
Meng-Fu Guo, Hang Yang, Li Ma
Summary: This study proposes three novel 3D double arrowhead plate-lattice (DAPL) auxetic structures, and validates their enhanced stiffness and energy absorption capacity compared to truss-lattices through experiments and numerical analysis. The study also reveals that geometrical parameters have minimal influence on the elastic constants of these structures.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Wei-Ming Zhang, Zhen-Yu Li, Jin-Shui Yang, Li Ma, Zhuang Lin, Ruediger Schmidt, Kai-Uwe Schroeder
Summary: This study designed and characterized a novel two-dimensional lightweight rotationally arranged auxetic structure, and systematically investigated its elastic properties, plastic collapse stress, and specific energy absorption through theoretical calculations, numerical simulations, and experimental methods. The results showed that the structure has excellent energy absorption capacity and extreme conditions, allowing for optimization according to different requirements.
MECHANICS OF MATERIALS
(2022)
Article
Mechanics
Zhen-Yu Li, Xin-Tao Wang, Li Ma, Lin-Zhi Wu
Summary: Auxetic structures have attracted attention due to their unconventional behavior, but their low stiffness limits their application. By using high-performance carbon fiber reinforced polymer composites, a study shows that a composite structure consisting of corrugated sheets and tubes exhibits a negative Poisson's ratio effect in large compression strain range.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Ge Qi, Chen-xi Liu, Kan Feng, Li Ma, Kai-Uwe Schroeder
Summary: This study provides exact analytical solutions for stress distribution within a bundled hollow cylinder under contact tractions, addressing the non-uniformity of stress distribution and developing maximum normalized stress maps for understanding stress distribution mechanisms.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Composites
Ankang Liu, Yunlong Chen, Jiqiang Hu, Bing Wang, Li Ma
Summary: Impact resistance and damage tolerance are important factors in the design of composite structures. This study investigated the damage and failure mechanism of CF/PEEK composite laminates under low-velocity impact and compression after impact loading conditions. The effects of different stacking sequences on performance were compared. Nondestructive testing, digital image correlation, and scanning electron microscopy were used to analyze structural damage. A 3D damage model based on continuum damage mechanics was established and numerical simulations were conducted. The results validated the model and predicted the ultimate residual strength.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Wei-Ming Zhang, Meng-Fu Guo, Jin-Shui Yang, Li Ma
Summary: This paper proposes a three-dimensional mechanical metamaterial with alternating Poisson's ratios and orthogonal opposite behaviors, which can be actuated mechanically to achieve signal output and logic control, and has important implications in mechanical computing and automatic control.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Mechanics
Yanfeng Zhang, Linzhi Wu, Yuguo Sun, Li Ma, Shidong Pan, Bing Wang, Jian Xiong, Zhengong Zhou
Summary: In this study, the influence of off-axial orientation on the pin-bearing failure behavior of 3D orthogonal woven carbon/carbon composites was evaluated using a sequential multiscale modelling strategy and experimental validation. Hierarchical numerical simulation methodology was developed to obtain precise mechanical responses, and off-axial angle sensitivity analysis was conducted. The primary damage mechanism under off-axial cases was found to be a combination of material out-of-plane swelling and yarns in-plane rotation.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Hang Yang, Nicholas D'Ambrosio, Peiyong Liu, Damiano Pasini, Li Ma
Summary: Shape memory materials can maintain temporary shapes without external constraints and revert to their permanent shape upon exposure to an external stimulus. This paper introduces a new approach using 3D-printable polymeric materials that do not rely on the shape memory effect to generate a robust shape memory response. The materials' shape reconfiguration and rapid recovery are solely governed by mechanical loading and temperature change, enabling programmable multistability, hyperelasticity, giant thermal deformations, and shape memory capacity.
Article
Engineering, Civil
Zhen-Yu Li, Xin-Tao Wang, Li Ma, Lin-Zhi Wu, Lifeng Wang
Summary: The mechanical properties of stacked origami structures can be improved by introducing fiber reinforced composites. In this study, composite stacked origami structures with different stacking angles and thickness of origami sheets are designed and fabricated using a hot molding process. Finite element simulation and experimental compression tests are conducted to investigate their mechanical properties and auxetic characteristics. The effects of origami sheets thickness and stacking angles on the in-plane and out-of-plane auxetic characteristics of the structure are discussed. The failure modes of the structures during compression are analyzed, and their energy absorption capacity is compared with other honeycomb materials.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Wei-Jing Wang, Wei-Ming Zhang, Meng-Fu Guo, Jin-Shui Yang, Li Ma
Summary: This study systematically investigates the dynamic response of windmill-like star-hexagon (WSH) honeycombs through theoretical calculations, numerical simulations, and experimental methods. The static and dynamic plateau stresses of WSH honeycombs are calculated, and critical velocities leading to different deformation modes are determined. Furthermore, the gradient design of WSH honeycombs is analyzed, and the energy absorption performance of gradient WSH honeycombs is explored through numerical simulations. It is found that WSH honeycombs exhibit better energy absorption capacity than conventional honeycombs under low-velocity impact loading, and the concave angle gradient design and thickness gradient design can further enhance their energy absorption performance.
THIN-WALLED STRUCTURES
(2023)
Article
Acoustics
Yu-Zhou Wang, Li Ma
Summary: Sandwich structures, especially curved ones, have garnered significant attention due to their superior stiffness and strength. These structures are essential for meeting mechanical loads as well as thermal, acoustic, optical, and electrical challenges. This paper proposes a composite structure that combines curved shell sandwich structures with acoustic metamaterials to achieve desired mechanical and acoustic properties. The theoretical model is established using the harmonic expansion method and principle of virtual work, and the sound transmission loss (STL) performance is studied along with the impact of structural geometry and material parameters.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Yun-Long Chen, Li Ma
Summary: This article investigates the free vibration and damping characteristics of carbon fiber-reinforced sandwich cylindrical shells with 3D reentrant auxetic cores (3D RSCSs). Finite element analysis and theoretical predictions using the Rayleigh-Ritz method and third-order shear deformation theory are conducted. Experimental tests on all-composite 3D RSCSs specimens manufactured through hot press molding and interlocking assembly validate the predicted modal properties. Furthermore, the influences of fiber ply angles and geometric parameters on the natural frequency and damping loss factor are investigated.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
