Article
Engineering, Multidisciplinary
Qi Zhang, Nhon Nguyen-Thanh, Weidong Li, A-Man Zhang, Shaofan Li, Kun Zhou
Summary: A coupling approach of the isogeometric-meshfree method and the peridynamic method is developed for static and dynamic crack propagation. The approach allows for flexible modeling of cracks while maintaining exact geometry representation. By using the balanced force principle, the isogeometric-meshfree nodes are directly coupled with peridynamic points, effectively eliminating surface effects and enforcing boundary conditions. The coupling approach achieves adaptive coupling with the same convergence rate as the isogeometric-meshfree method and is extended to crack problems with contact loading.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Farshad Rahmani, Reza Kamgar, Reza Rahgozar
Summary: This paper investigates the bending and vibration characteristics of metallic and functionally graded beam structures using the Carrera unified formulation and isogeometric analysis. Numerical examples are presented to demonstrate the accuracy and cost-effectiveness of the proposed method.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Quansheng Zang, Jun Liu, Wenbin Ye, Fan Yang, Congkuan Hao, Gao Lin
Summary: A novel plate formulation based on the isogeometric analysis and scaled boundary element method is proposed for solving static bending and free vibration problems of functionally graded material (FGM) plates. The proposed method reduces the problem dimension, accurately predicts stress distribution, and is applicable to FGM plates with complex geometries.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Yajun Cao, Huaiwei Huang, Yifei Ding
Summary: This paper proposes an isogeometric optimization method to optimize the material distribution of piezoelectric functionally graded material (PFGM) energy harvester. By conducting numerical examples, the convergence and accuracy of the optimization results, as well as the effects of the metallic volume ratio constraint and the initial design domain on the optimized material distribution, are studied.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Saifeng Zhong, Guoyong Jin, Tiangui Ye
Summary: In this paper, a combined formulation is proposed to model and optimize the material of rotning in-plane functionally graded thin-shell blades with variable thickness. The vibration characteristics of the rotating blade model are studied and the IFG volume fraction is optimized using the isogeometric approach (IGA) and metaheuristic algorithms. The effects of rotating speed, variable thickness, and IFG materials are considered in the governing equations.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
H. Nguyen-Xuan, Kim Q. Tran, Chien H. Thai, Jaehong Lee
Summary: This paper investigates a new model of porous plates called Functionally Graded Triply Periodic Minimal Surface (FG-TPMS) plates. The effective moduli and Poisson's ratio of TPMS structures are evaluated using a fitting technique based on a two-phase piece-wise function. The mechanical characteristics of the FG-TPMS plates are verified through numerical examples, demonstrating their reliability and accuracy.
COMPOSITE STRUCTURES
(2023)
Article
Mathematics, Interdisciplinary Applications
Weidong Li, Nguyen-Thanh Nhon, Qi Zhang, Hejun Du, Shaofan Li, Kun Zhou
Summary: A multigrid coupling approach of the extended isogeometric-meshfree method and bond-based peridynamics is developed for static and dynamic fracture problems. The approach divides the problem domain into two subdomains and connects them with interface meshes to capture fracture patterns.
COMPUTATIONAL MECHANICS
(2023)
Article
Mechanics
Chao Wang, Liangliang Ma, Yang Bu, Jie Zhao, Kang Hao Cheong
Summary: This study proposes an effective approach for the optimal material distribution design of bi-directional functionally graded plates (2D-FGPs) with complex shapes. By combining multi-patch isogeometric analysis and an improved multi-objective particle swarm optimization algorithm, it achieves a unified CAD/CAE optimization design of 2D-FGPs across multiple non-smooth boundaries.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Composites
Alireza Sayyidmousavi, Mehrdad Foroutan, Zouheir Fawaz
Summary: This study investigates a new class of advanced ultralight composite materials, utilizing porous polymer matrix reinforced by carbon nanotubes. The research suggests that symmetric porosity distribution type is the best choice for relatively thick cylinders, as it offers smaller mass and higher stiffness compared to other distribution types.
POLYMER COMPOSITES
(2021)
Article
Multidisciplinary Sciences
Saurav Sharma, Rajeev Kumar, Mohammad Talha, Rahul Vaish
Summary: The study investigates the possibility of achieving electrical poling in a material purely by mechanical means, utilizing the potential of coexistence of flexoelectricity and piezoelectricity. Simulation results suggest that up to 75% of the material volume can be poled. Combination of piezoelectric and flexoelectric effects enhances the equivalent piezoelectric coefficient in converse electromechanical coupling while having a detrimental effect in direct equivalent piezoelectric coefficient.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Engineering, Civil
V. Pasha Zanussi, H. Shahverdi, V. Khalafi, M. M. Navardi
Summary: The present study analyzes the nonlinear aeroelastic behavior of Functionally Graded plates with arbitrary shapes using an isogeometric approach. The aeroelastic equations and the structural dynamics equations are established to study the flutter and post-flutter behavior of the plates. The effects of shape and boundary conditions are also examined.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Quoc-Hoa Pham, Phu-Cuong Nguyen
Summary: This paper analyzes the dynamic stability behaviors of porous functionally graded microplates using a refined plate theory and modified couple stress theory within an isogeometric analysis framework. The effects of microstructure are captured by employing only one material length scale parameter. Numerical investigations are carried out to study the influences of factors such as porosity coefficient and distribution, material length scale, and load factors on dynamic instability characteristics.
COMPOSITE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Marina Alves Maia, Evandro Parente Jr, Antonio Macario Cartaxo de Melo
Summary: This work proposes an efficient methodology for the optimum design of functionally graded structures using a Kriging-based approach combined with a hybrid PSO algorithm. The surrogate model replaces high-fidelity structural responses and design variables are related to volume fraction distribution and thickness. Results demonstrate significant reduction in computational effort compared to conventional approaches.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Computer Science, Interdisciplinary Applications
Chien H. Thai, H. Nguyen-Xuan, Lieu B. Nguyen, P. Phung-Van
Summary: A size-dependent moving Kriging meshfree approach is proposed for analyzing bending, free vibration, and buckling of functionally graded microplates. The study uses virtual work principle, mixed rule for material properties, and refined plate theory to determine displacement, natural frequencies, and buckling loads of FG microplates. Results demonstrate that natural frequencies, buckling loads, and displacements of FG microplates are influenced by geometrical parameters, boundary conditions, and length-scale parameters.
ENGINEERING WITH COMPUTERS
(2022)
Article
Engineering, Multidisciplinary
Xianbo Sun, Yahui Zhang
Summary: This paper presents an adaptive stochastic isogeometric method for the nonlinear bending analysis of thin functionally graded material shells with material uncertainties. The method incorporates a second-order random field to describe the spatial randomness of material properties. An adaptive, nested, and non-intrusive Chebyshev interpolation process is formulated to approximate the response surface of random inputs. The effectiveness of the method is demonstrated through examples and the influence of the statistical characteristics of the gradient index field on the response surface analysis and the random response is investigated.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Xin Wu, Tingting Huang, Kun Zhou, Wei Dai
Summary: This paper proposes a multivariate degradation model based on the Wiener process to address the challenges of degradation modeling and reliability prediction in modern products with complex structures and multiple dependent performance indicators (PIs). The model establishes correlation among PIs by considering common underlying components called clusters and incorporates the effect of dynamic environment on degradation rate. The reliability function of the product is obtained using an approximation approach. Simulation and case studies demonstrate the effectiveness and application of the proposed model.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART O-JOURNAL OF RISK AND RELIABILITY
(2023)
Article
Mechanics
Weidong Li, Nhon Nguyen-Thanh, Hejun Du, Kun Zhou
Summary: An adaptive phase-field modeling approach is developed for the dynamic brittle fracture of composite materials subjected to impact loading. This approach is capable of capturing the dynamic fracture patterns in composite materials including matrix cracking, delamination between adjacent plies, and interaction between the two failure modes via the exploitation of interface and crack phase fields. The driving force for the crack evolution is derived by introducing the contributions of the longitudinal and transverse damage considering the tension-compression asymmetry. Moreover, an anisotropic crack surface density function is introduced by considering the material anisotropy induced by fibers. The computational efficiency of the dynamic fracture modeling is improved via the adaptive mesh refinement strategy within the framework of the isogeometric-meshfree approach. The Newmark implicit integration scheme is used for the temporal discretization of the phase-field governing equations. Finally, simulations of both mode-I and mixed-mode fracture, such as the dynamic branching and the three-point bending tests, are implemented for homogeneous materials and composites, which demonstrates the reliability of the developed approach.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Chemical
Sheng Guo, Meng Chen, Liming You, Yu Wei, Chao Cai, Qingsong Wei, Huali Zhang, Kun Zhou
Summary: This study demonstrates the potential of 3D printing in wastewater purification through the preparation of a hierarchically porous copper material. The 3D-ZVC/PMS/Vis system exhibits excellent catalytic performance in degrading organic pollutants and achieves a high degradation efficiency of tetracycline. It also shows broad pH resistance, adaptability, stability, and reusability. The degradation process involves electrons and various reactive oxygen species, with O-1(2) playing a dominant role, and the toxicity of degradation products is significantly reduced.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
S. Macrae Montgomery, Frederic Demoly, Kun Zhou, H. Jerry Qi
Summary: Digital light processing (DLP) is a widely used additive manufacturing technique with high accuracy and print speeds. Grayscale DLP printing is a new development that allows sub-pixel manipulation of printed shapes, enhancing accuracy beyond the typical capabilities. A methodology involving pixel-level grayscale control and a reaction-diffusion model is developed to predict and optimize the printed shapes. This advancement in DLP printing accuracy enables the fabrication of functional and structural components with smaller features or smoother faces.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Weidong Li, Marreddy Ambati, Nhon Nguyen-Thanh, Hejun Du, Kun Zhou
Summary: In this study, a fourth-order phase-field modeling of ductile fracture in elastic-plastic materials is conducted using an adaptive isogeometric-meshfree approach. The developed model includes the elastic contribution and the dissipated contribution due to fracture and plasticity in the total energy functional. The coupling between plasticity and fracture is achieved through a degradation function applied to the elastic energy. The model is capable of accurately regularizing sharp cracks while relaxing the mesh size requirements.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Qi Zhang, Nhon Nguyen-Thanh, Weidong Li, A-Man Zhang, Shaofan Li, Kun Zhou
Summary: A coupling approach of the isogeometric-meshfree method and the peridynamic method is developed for static and dynamic crack propagation. The approach allows for flexible modeling of cracks while maintaining exact geometry representation. By using the balanced force principle, the isogeometric-meshfree nodes are directly coupled with peridynamic points, effectively eliminating surface effects and enforcing boundary conditions. The coupling approach achieves adaptive coupling with the same convergence rate as the isogeometric-meshfree method and is extended to crack problems with contact loading.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Xiaojiang Liu, Boyuan Li, Zhongze Gu, Kun Zhou
Summary: This work achieves linear, wide-angle, and even ultra-wide-angle liquid transport by 4D printing of butterfly scale-inspired re-entrant structures. These structures enable unidirectional liquid transport and the transport angle can be adjusted by controlling the layout and Laplace pressure. Ultra-wide-angle transport is validated in both 2D and 3D space.
Article
Engineering, Manufacturing
Yanbei Hou, Ming Gao, Jiayao Chen, Wei Shian Tey, Mei Chen, Han Zheng, Boyuan Li, Lihua Zhao, Kun Zhou
Summary: A simple and cost-effective surface modification method for Fe3O4-coated aramid fibres is proposed to fabricate polyamide 12 composites by the multi jet fusion technology. The addition of Fe3O4@AF hybrids significantly improved the tensile strength, Young's modulus, and flame retardancy of the composites.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Environmental Sciences
Terence Zhi Xiang Hong, Hieu Trung Kieu, Liming You, Adrian Wing-Keung Law, Kun Zhou
Summary: In this study, molecular dynamics simulations were used to evaluate the performance of 2D HAB-derived MOF membranes in reverse osmosis seawater desalination. The CuHAB membrane showed the highest water flux, and the pore diameter of the MOFs affected the water flux as well.
Article
Nanoscience & Nanotechnology
Huijun Li, Kun Zhou
Summary: A GL-organohydrogel with longterm stability, moisture lock-in capability, and extreme-temperature tolerance has been developed for stretchable electronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Mei Chen, Yanbei Hou, Ran An, H. Jerry Qi, Kun Zhou
Summary: A 4D-printable photochromic titanium-based nanocrystal (TiNC)/LCE composite ink is developed, allowing for reprogrammable photochromism and photoactuation of a single 4D-printed architecture. The printed TiNC/LCE composite can switch colors between white and black in response to UV irradiation and oxygen exposure, and can also undergo photothermal actuation upon NIR irradiation. Through precise control over the structural design and light irradiation, the 4D-printed object can be globally or locally programmed, erased, and reprogrammed to achieve desired photocontrollable color patterns and 3D structure constructions.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Jinqiang Wang, Ruichen Wang, Zixiao Zhu, Kun Zhou, Dong Wang
Summary: This study presents the design of untethered soft robots with programmable motions and multifunctionalities using kirigami metamaterials and hard-magnetic actuation.
APPLIED PHYSICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Yujia Tian, Devesh R. Kripalani, Ming Xue, Kun Zhou
Summary: This article investigates the electronic and structural properties of the contact between gold and monolayer SnO (mSnO), and proposes the insertion of graphene at the contact interface to decouple the electronic energy levels between the metal and the semiconductor. The study provides guidance for the performance evaluation of the gold-SnO contact and the application of 2D materials in electronic devices.
Article
Chemistry, Multidisciplinary
Jiayao Chen, Ran An, Wei Shian Tey, Qingyun Zeng, Lihua Zhao, Kun Zhou
Summary: This study proposes a new method for the homogeneous dispersion of carbon nanotubes (CNTs) in elastomer composites printed via multi jet fusion using dual-functional toughness agents (TAs). The TAs not only serve as an infrared absorbing colorant for selective powder fusion but also act as strengthening and toughening fillers. By optimizing the printing parameters and agent formulation, the mechanical performance of the printed parts is maximized, resulting in significant improvements in strength and toughness in all printing orientations and alleviation of mechanical anisotropy. This in situ filler addition method using tailorable TAs has the potential to fabricate parts with site-specific mechanical properties and assist in the scalable manufacturing of 3D-printed elastomers.
Article
Automation & Control Systems
Connor D. Armstrong, Liang Yue, Frederic Demoly, Kun Zhou, H. Jerry Qi
Summary: A versatile and reconfigurable direct ink writing (DIW) manufacturing method has been developed to fabricate high-strength, self-supporting parts in unconventional printing spaces. By combining a photopolymer and a tough epoxy resin, this two-stage hybrid DIW ink enables layer-by-layer printing of complex structures and fabrication of large volume structures on diverse substrates. The method demonstrates the capability to print complex structures in inverted and horizontal environments, with the potential for applications such as enhancing functionality, repair, and structure health monitoring by appending new parts to existing structures.
ADVANCED INTELLIGENT SYSTEMS
(2023)
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)
