今日更新：Composite Structures 4 篇，Composites Part A: Applied Science and Manufacturing 2 篇，Composites Part B: Engineering 3 篇，Composites Science and Technology 5 篇
Composite Structures
The effect of span length on the flexural properties of glass and basalt fiber reinforced sandwich structures with balsa wood core for sustainable shipbuilding
Mohamed Chairi, Jalal El Bahaoui, Issam Hanafi, Federica Favaloro, Chiara Borsellino, Fabia Galantini, Guido Di Bella
doi:10.1016/j.compstruct.2024.118187
跨长对可持续造船用玻璃玄武岩纤维增强轻木芯夹层结构抗弯性能的影响
The current research aims to analyze the mechanical characterization of sandwich materials through a three-point flexural test. The sandwich structures in question composed of balsa wood as a core and four different types of fiber reinforced vinyl ester composite facesheets, namely Glass, Basalt, Glass/Carbon, and Basalt/Carbon. The sandwich panels were prepared using the vacuum infused processing method. The primary objective of this investigation is to explore the feasibility of utilizing basalt fibers for the production of structural parts in shipbuilding and replacing the already existed glass fibers. The flexural test was carried out with using three-point flexural test with varying the span length from 120 mm, 180 mm, 220 mm. Additionally, an analysis of variance (ANOVA) was then carried out to compare the mean values of properties deduced from these tests. The results showed that using basalt fibers instead of glass fiber reinforced enhanced the flexural stiffness of the sandwich structure. The flexural strength and modulus are shown to depend on span length and fiber type. The flexural modulus increases with an increase in span length. Similarly, flexural strength increases in glass fiber-based structures, while a slight reduction is observed in basalt fiber-reinforced structures the larger span length. The findings of this research suggest that basalt fibers hold potential as a replacement for glass fibers in producing structural components in shipbuilding. These results offer valuable information that can aid in the design and optimization of sandwich materials in shipbuilding.
Energy absorption behavior of aramid/DCPD backing to determining the blunt trauma criterion of a human head in a ballistic helmet
Kayode Olaleye, Dariusz Pyka, Adam Kurzawa, Mirosław Bocian, Krzysztof Jamroziak
doi:10.1016/j.compstruct.2024.118172
芳纶/DCPD的能量吸收行为为确定防弹头盔中人头部钝性损伤标准提供依据
The research involved analyzing a material solution for a 9 mm Full Metal Jacket (FMJ) Parabellum loaded with ballistic impact on a resin laminate strengthened with extra aramid layers. The goal of this research is to determine the impact of material (aramid/DCPD) layer thickness on the energy absorption performance of the laminate for blunt trauma as blunt criterion (BC). For this purpose, aramid fiber laminate with dicyclopentadiene (DCPD) resin matrix was prepared. Laminate samples were tested on the drop test and were subjected to ballistic loads. The ABAQUS/Explicit program and finite element method were used to conduct the study. Individual material systems' optimal solutions were created using numerical analysis, and they were then classified using the mass-efficiency criterion. The numerical results were compared with the experimental using samples prepared according to the modeling methods. Selected results were shown and discussed in the later part of the paper.
Uncertain stochastic vibration characteristic analysis of composite laminated rectangular plate based on improved kriging model
Yugeng Chen, Rui Zhong, Qingshan Wang, Liming Chen, Bin Qin
doi:10.1016/j.compstruct.2024.118180
基于改进kriging模型的复合材料叠合矩形板不确定随机振动特性分析
The stochastic vibration analysis of composite laminated structures has been conducted extensively in the field of structural dynamics. Existing studies in this field are primarily conducted based on deterministic structural parameters, whereas the effects of parametric uncertainties on the stochastic vibration characteristics of composite laminated structures are disregarded. This study investigates a composite laminated rectangular plate by considering the effect of interval uncertainty in the intrinsic parameters and load on its stochastic vibration characteristics. A rapid analysis model for the structural stochastic vibration characteristics is established based on an improved kriging model. Additionally, an innovative approach that combines the improved kriging model with intelligent optimization is proposed to solve problems pertaining to uncertainty-propagation analysis of structures. Based on this method, an uncertainty-propagation analysis of structural stochastic vibration responses is efficiently implemented. The effectiveness of the proposed method is demonstrated by comparing the results with those obtained from Monte Carlo simulation. The numerical results indicate that different uncertain factors exert varying degrees of effect on the stochastic vibration characteristics of the plate. Finally, the effects of density, elastic modulus ratio, fiber orientation and load on the interval fluctuation patterns of uncertain responses are discussed.
Quasi-static and dynamic behavior analysis of 3D CFRP woven laminated composite auxetic structures for load-bearing and energy absorption applications
Ehsan Etemadi, Minglonghai Zhang, Mohaddeseh Gholikord, Keda Li, Mabel Mei Po Ho, Hong Hu
doi:10.1016/j.compstruct.2024.118182
三维CFRP编织层合复合材料减振结构的准静动态性能分析
This paper investigated the quasi-static and dynamic behavior of 3D auxetic metamaterial structures made from carbon fiber reinforced polymer (CFRP) laminated composite. The aim of the study was to enhance design methodologies for load-bearing and energy absorption applications of these 3D novel structures, filling the research gap in understanding their response to quasi-static and especially dynamic loadings. The two novel 3D structures were designed and fabricated by using an interlocking assembly method based on the 2D auxetic CFRP sheets, which were formed with hybrid double-arrow-head with re-entrant and star unit-cells and made with plain weave carbon epoxy prepregs. The finite element (FE) method was adopted to analyze the mechanical characteristics of the structures under the quasi-static and dynamic loading, and Hashin failure criteria were used to define damage in the structures. The study showed that the designed 3D auxetic CFRP structures simultaneously exhibit superior auxeticity, load-bearing, and energy absorption capacity.
This article is based on the supersonic directly connected wind tunnel. Through a specially designed experimental chamber, combined with infrared temperature measurement, high-speed camera, etc., in-situ monitoring of composite materials under airflow at Ma 3.0 with a total temperature of 950 ∼ 1473K was carried out. The dimensional analysis method was used to propose dimensionless parameters to characterize the thermal coupling caused by high-speed airflow thermal shock. Research has shown that the thermal coupling effect of supersonic airflow causes uneven temperature inside the material, and the thermal stress caused by temperature gradient changes (including increasing and decreasing processes) is the main reason for material damage. The damage of ceramic matrix composites under thermal shock mainly manifests as a decrease in surface roughness, surface fiber fracture and a decrease in elastic modulus. In addition, the study also found that there are damage thresholds for the thermal shock effect of airflow at different total temperatures, which helps to further understand the thermomechanical damage mechanism and degradation law of composite structure under high-temperature transient conditions.
本文基于超音速直连风洞。通过专门设计的实验舱，结合红外测温、高速摄像等手段，对复合材料在 Ma 3.0 气流下的总温度 950 ∼ 1473K 进行了原位监测。利用尺寸分析方法提出了表征高速气流热冲击引起的热耦合的无量纲参数。研究表明，超音速气流的热耦合效应导致材料内部温度不均匀，温度梯度变化（包括上升和下降过程）引起的热应力是材料损伤的主要原因。陶瓷基复合材料在热冲击下的损伤主要表现为表面粗糙度下降、表面纤维断裂和弹性模量降低。此外，研究还发现不同总温下气流热冲击效应存在损伤阈值，有助于进一步了解高温瞬态条件下复合材料结构的热力学损伤机理和降解规律。
Compression and hydrothermal ageing after impact of carbon fibre reinforced epoxy laminates
Rowan L. Caldwell, Peter Davies, Mael Arhant, B. Gangadhara Prusty
doi:10.1016/j.compositesa.2024.108258
碳纤维增强环氧层压板冲击后的压缩和水热老化
This paper proposes a new methodology for the assessment of seawater ageing effects on impact-damaged composite laminates. CF/Epoxy laminates which were unimpacted, and impacted at 30 J, 60 J, and 90 J by hemispherical and conical impactors were subject to 4 months hydrothermal ageing in renewed natural seawater at 60 +/-2 °C. The majority of water uptake by impacted laminates (0.05 wt% − 0.3 wt%) occurred in the first 24 h and is believed to be held in damage cavities by capillary mechanisms. The increase in diffusive water uptake rate by the matrix due to impact damage was only small, at less than 0.008 wt%.mm.hr−0,5, compared with the total diffusive water uptake rate of 0.1 wt%.mm.hr−0,5. Hydrothermal ageing reduced the residual compressive strength of pristine laminates by 25 % and impact-damaged laminates by 8 % to 16 % for impacts between 30 J and 90 J.
Biomimetic papilla texture by femtosecond laser for high-strength CFRTP/A6061-T6 FSSW hybrid structures
Xiaoyang Bi, Hua Liu, Yan Li, Mengjia Xu, Zhenmin Wang
doi:10.1016/j.compositesb.2024.111500
飞秒激光对高强度CFRTP/A6061-T6 FSSW杂化结构的仿生乳 头织构
The lightweight design concept in structural applications has generated interest in hybrid structures of carbon-fiber-reinforced thermoplastics (CFRTP) and metals as attractive structure components. However, these hybrid structures face challenges due to the significant differences in physical and chemical properties between CFRTP and metals, resulting in limited strength and rendering them unsuitable for advanced transportation. To address these limitations, the current research focuses on creating a biomimetic texture on A6061-T6 (6061) surfaces using femtosecond laser to manufacture high-strength hybrid structures, inspired by organismal body surfaces. The CFRTP and 6061 were joined by friction stir spot welding (FSSW). The femtosecond laser treatment produces double-scale roughness on 6061 surfaces and causes carbon to absorb into alumina. These changes in physical and chemical structures enhance the compatibility between 6061 and CFRTP. The biomimetic rough aluminum surface creates effective mechanical interlock at the interface with CFRTP, preventing the initiation and propagation of fracture cracks. The presence of absorbed carbon enhances the Al-O covalency, which influences the bonding behavior at CFRTP/6061 interfaces. The improved compatibility, mechanical interlock, and enhanced bonding behavior synergistically strengthen the joint strength of CFRTP/6061 hybrid structure modified by the biomimetic papilla structure. Current biomimetic design strategy inherits the remarkable natural wisdom and is expected to provide valuable insights for the development and application of CFRTP/metal hybrid structures.
From experimental testing to computational modelling: A review of shape memory alloy fiber-reinforced concrete composites
Alireza Tabrizikahou, Mieczysław Kuczma, Christoph Czaderski, Moslem Shahverdi
doi:10.1016/j.compositesb.2024.111530
从实验测试到计算模型:形状记忆合金纤维增强混凝土复合材料综述
Shape memory alloys (SMAs) have unique characteristics, such as the shape memory effect, which allows them to recover their initial shape after being deformed when stimulated, and pseudoelasticity, which enables them to accommodate large deformation without residual strains after being unloaded. SMAs may be used as short fibers in fiber-reinforced concrete (FRC) composites to pre-stress, heal fractures, and re-center themselves. As a result, SMA-FRC is a potential alternative to conventional construction materials in a wide range of applications. SMA-FRC composite application and modeling may present challenges, such as computational modeling complexities, practical constraints regarding fiber volume fraction, fiber-to-concrete adhesion strength, and the complex temperature-based activation of SMA fibers embedded in concrete. Despite these challenges and difficulties, significant work toward resolution is being made, making SMA-FRC an innovative technology with many potential research and development alternatives. This article presents an overview of experimental testing, computational methods, limitations, and future research potential for SMA-FRC composite materials. The study also looks at practical applications of SMA fibers in concrete composites including beam–column junctions, pre-stressing, and self-healing, as well as major developments and implications. The advantages and limits of several computational strategies for studying SMA-FRCs are discussed. The research suggests multiscale modeling as an effective approach for analyzing SMA-FRC, and a unique example of SMA-FRC multiscale modeling is briefly demonstrated. In conclusion, this research emphasizes the significant potential of SMA-FRC composites as novel construction materials with prospective practical applications, as well as the importance of multiscale modeling in SMA-FRC computational modeling.
Coating effect of metal organic complex (Co-DTPMP) layer on enhancing PEC water oxidation performance of BiVO4 photoanode
Alaa Magdy Saad, Mostafa Saad Sayed, Amr Hussien Mady, Woo Kyoung Kim
doi:10.1016/j.compositesb.2024.111534
金属有机配合物(Co-DTPMP)涂层对提高BiVO4光阳极PEC水氧化性能的影响
Photoelectrochemical (PEC) water splitting is a promising method for transforming solar energy into clean and sustainable energy. However, PEC is severely limited, and they cannot achieve the predicted photocurrent density owing to the severe photochemical deterioration of the electrode and the recombination of photogenerated carriers. In this study, BiVO4/Co- diethylenetriamine Penta (methylene phosphonic acid) (BVO/Co-DTPMP) co-catalyst was successfully prepared as a nanoporous photoanode. Diethylenetriamine Penta (methylene phosphonic acid) was crosslinked with Co ions and coated on the BiVO4 surface by successive ionic layer adsorption and reaction (SILAR) to reduce fast recombination, which correlated with the BiVO4 photoanode. Various characterization and PEC measurements were conducted, revealing that the co-catalyst thin layer enhanced the charge separation and electrons transfer which significantly affected on the PEC performance of BiVO4, and the current density by BVO/Co-DTPMP was 4 mA cm−2 at 1.23 V vs. RHE. Furthermore, the co-catalyst exhibited improved charge transport and long-term stability.
光电化学水分解是一种很有前途的将太阳能转化为清洁和可持续能源的方法。然而，PEC受到严重限制，由于电极严重的光化学劣化和光生载流子的重组，它们无法达到预期的光电流密度。本研究成功制备了BiVO4/Co-二乙烯三胺五亚甲基膦酸(BVO/Co- dtpmp)共催化剂作为纳米孔光阳极。二乙烯三胺五(亚甲基膦酸)与Co离子交联，并通过连续离子层吸附和反应(SILAR)涂覆在BiVO4表面，以减少快速复合，这与BiVO4光阳极相关。各种表征和PEC测量结果表明，共催化剂薄层增强了BiVO4的电荷分离和电子转移，显著影响了BiVO4的PEC性能，BVO/Co-DTPMP在1.23 V时的电流密度为4 mA cm−2。此外，共催化剂表现出更好的电荷输运和长期稳定性。
Composites Science and Technology
Comparison of piezoresistive sensitivity based on the size of silica as secondary filler on hybrid CNT composites
Kun-Woo Nam, Oh-Nyoung Hur, Byung-Ho Kang, Sung-Hoon Park
doi:10.1016/j.compscitech.2024.110642
杂化碳纳米管复合材料中二次填料二氧化硅尺寸对压阻灵敏度的影响
Recent research has increasingly focused on the potential applications of carbon nanotube (CNT) hybrid composites in wearable sensor technologies. Piezoresistivity, which is characterized by the ability to detect alterations in electrical resistance in response to external forces, is a pivotal attribute of resistive sensors. Numerous studies have attempted to improve this performance by incorporating secondary fillers. Despite extensive efforts to comprehend the influence of the dimensions of secondary fillers on electrical conductivity under static and dynamic conditions, notable confusion persists in the literature regarding the comparative analysis of the effects of nano- and microscale secondary fillers. In this study, two distinct sizes of silica particles were introduced as secondary fillers in CNT/polymer composites, followed by a rigorous comparative analysis of their mechanical and electrical properties under static conditions. Furthermore, this study assessed the influence of the silica particle size on the electrical resistance under dynamic tensile conditions, elucidating its impact on the conductive network.
Microstructural Evolution of Highly Aligned Discontinuous Fiber Composites during Longitudinal Extension in Forming
Thomas A. Cender, Pavel Simacek, John W. Gillespie, Suresh G. Advani
doi:10.1016/j.compscitech.2024.110649
高对准不连续纤维复合材料纵向拉伸成形过程中的显微组织演变
The longitudinal extensional viscosity of a highly aligned discontinuous fiber (ADF) thermoplastic matrix composite is investigated to develop a model and validate microstructural evolutionary mechanisms. Samples stretched at constant temperature and strain rate are shown to exhibit a strain softening behavior. X-ray CT analysis and optical micrographs show that the composite microstructure deconsolidates before forming and evolves with deformation. The conventional unit cell micromechanical model includes the effects of matrix viscosity, fiber aspect ratio and fiber volume fraction. This model is modified to include the stiffening effect of fiber spacing variability, and the softening effects of porosity and decreasing fiber overlap length with elongation. Calibration of the model reveals that matrix shear strain rate is an order of magnitude higher than previously predicted due to local fiber spacing. This effect is captured by a fiber spacing variability parameter which scales average spacing down by an order of magnitude. The observed strain softening behavior is described and a combinations of fiber overlap length reduction and local fiber spacing increase.
High-performance fiber-reinforced thermoset composites (FRTCs) are highly demanded in modern society but are challenged because they depend on nonrenewable fossil-based feedstocks, are hard to recycle after service, and lack advanced functions. Here, we report a methodology to fabricate sustainable, recyclable, high-performance, and multifunctional FRTCs from renewable feedstocks such as vanillin, glycerol triglycidyl ether, 1,10-diaminodecane, and basalt fiber. We designed a mussel-inspired approach to prepare high conductive basalt fiber (CBF), and combined the CBF with a fully biobased covalent adaptable network (CAN) based on dynamic imine bonds to produce the composites i.e., CAN/CBF laminar composites through a solvent-free method. The CAN/CBF composites showed highly reinforced mechanical properties and multiple functionalities including electromagnetic interference shielding, shape memory and self-adhesion characters through combination in the advantages and functions of both CAN and CBF. Furthermore, we demonstrate that the CAN matrix and the reinforced CBF can be recycled separately and can be further reformed to the CAN/CBF composites due to the dynamic nature of the CAN matrix. Our study thus provides an urgently applicable approach for advanced manufacturing toward the green and circular advanced composites economy.
Rutger Kok, Ramón Cuvillo, Verónica Rodríguez-García, Jesús Pernas, José Alfonso Artero-Guerrero, Roberto Guzmán de Villoria, Francisca Martínez-Hergueta
doi:10.1016/j.compscitech.2024.110636
自动铺放先进铺层复合材料的低速冲击响应
This study explores the influence of the internal architecture in the low-velocity impact response of Automated Fiber Placement Advanced Placed Ply laminates. AP-PLY laminates with different lay-up are subjected to low velocity impact and compression after impact experiments. Different performance in terms of damage tolerance is obtained as a function of their internal architecture. Triaxial and quasi-isotropic AP-PLY configurations presented a reduced extension of the delamination in comparison to cross-ply panels. As a result, the cross-ply configuration exhibited a drastic loss in residual strength of 49.1% when subjected to 50 J of impact energy. Numerical simulations were employed to provide insight into the deformation and failure mechanisms (e.g., matrix cracking of directly impacted yarns, delamination or tow debonding), and assess the performance of AP-PLY against conventional angle-ply laminates, predicting larger delamination for the latter, showing the potential of the AP-PLY architecture to produce laminates with improved low-velocity impact performance.
Piezoresistivity Analyses of GNP-filled Composite Piezoresistor Under Cycling Loading and Correlation with The Monte Carlo Percolation Model
Melike Nur Önder, Mehmet Ali Gülgün, Melih Papila
doi:10.1016/j.compscitech.2024.110641
循环加载下gnp填充复合压敏电阻的压阻分析及其与蒙特卡罗渗流模型的相关性
This paper presents a composite piezoresistor made of graphite paste and graphene nano-platelets (GNP). We focused on fluctuations in the gauge factor of piezoresistive composites and their dependence on the amplitude of strain cycles. A three-dimensional Monte Carlo percolation model was created. The model examines how the interactions between fillers and deformation-driven geometric changes could affect piezoresistivity. The present model of the composite piezoresistor simulates the percolation path for conduction through tunneling and capacitive interaction of particle pairs. Strain cycles of different amplitudes (loading parameter) and Poisson’s ratios (material parameter) are the variables of the analyses by the model. During the loading, the algorithm simulates the cross-sectional shrinkage of the matrix given the Poisson’s ratio. Shrinkage of the matrix enhances the conductance while the extension decreases it. Simulations demonstrated that the impact of the shrinkage on piezoresistivity varies with the amplitude of the strain. The results of the experimental plan for the composite piezoresistors are qualitatively in line with the simulations verifying the dominant influence of variations in extension/shrinkage amplitude as the main reason for a degrading gauge factor.
