Composite Structures最新文献

英文中文

Effect of prepreg ply thickness and orientation on tensile properties and damage onset in carbon-fiber composites for cryogenic environments

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-21 DOI: 10.1016/j.compstruct.2025.118996

Eduardo Szpoganicz , Fabian Hübner , Uwe Beier , Matthias Geistbeck , Maximilian Korff , Ling Chen , Youhong Tang , Tobias Dickhut , Holger Ruckdäschel

This study addresses the effects of laminate design on the damage and failure behaviour of carbon-fiber reinforced composites with varying ply thicknesses and stacking configurations under cryogenic temperatures. The aim was to observe the ultimate tensile performance and in-situ onset of damage at 296 and 77 K environments, combining microscopy and simulation analyses. Laminates with fiber areal weights of 140, 70 and 45 g/m² were stacked in 2 different quasi-isotropic configurations. The results show that ultimate tensile properties are improved at 77 K, though failure strain slightly decreases. Thinner ply laminates with 70 and 45 g/m² showed a 15–20 % improvement in cryogenic tensile failure-strain, while damage onset shifted from 0.5 % to 0.8 % of strain. Adding off-axis plies improved laminates by 10–15 %, preventing damage onset up to failure. Microscopy and simulation analyses showed good agreement with the in-situ signal for the onset of damage, indicating matching levels of delamination failure initiation measured at 77 K. No transverse microcracks were observed, and permeation measurements showed no significant leakage increase after delamination onset. Ultimately, this work introduces a novel integrated approach by combining in-situ cryogenic testing, damage onset methodology, fractography, simulation analysis, and gas permeation measurements.

本研究探讨了在低温条件下，不同层厚和堆叠结构的层压板设计对碳纤维增强复合材料的损伤和失效行为的影响。目的是结合显微镜和模拟分析，观察 296 K 和 77 K 环境下的极限拉伸性能和原位损伤的发生。以两种不同的准各向同性配置堆叠了纤维平均重量分别为 140、70 和 45 g/m2 的层压板。结果表明，虽然破坏应变略有下降，但在 77 K 时极限拉伸性能有所改善。70克/平方米和45克/平方米的薄层板在低温拉伸破坏应变方面提高了15%-20%，而破坏开始应变从0.5%提高到0.8%。添加离轴层后，层压板的性能提高了 10-15%，防止了损坏的发生直至破坏。显微镜分析和模拟分析表明，损害发生时的原位信号与在 77 K 温度下测量到的分层破坏起始水平相吻合。没有观察到横向微裂缝，渗透测量结果表明，分层发生后泄漏量没有显著增加。最终，这项工作通过将原位低温测试、损伤发生方法、断裂学、模拟分析和气体渗透测量相结合，引入了一种新颖的综合方法。

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引用次数: 0

Blast resistance of sandwich structures consisting of re-entrant honeycombs reinforced by catenary

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-20 DOI: 10.1016/j.compstruct.2025.118995

Zhen Zou , Fengxiang Xu , Xiaoqiang Niu , Yifan Zhu , Zhoushun Jiang

In order to further improve the blast resistance of re-entrant honeycomb (RH) cored sandwich panels while ensuring manufacturability, a sandwich panel consisting of RH reinforced by catenary is proposed, and its blast resistance is evaluated through the finite element method validated by the explosion experiments of reinforced RH (RRH) cored sandwich panels. The numerical results show that the RRH core can achieve an 18.7% decline in the maximum deflection of back facesheets, and a 25.7% increase in energy absorption, compared to the classic RH core with the same relative density. When RRH and RH cores share the same thickness, the former can achieve a 76.1% decrease in the maximum deflection of back facesheets and a 10.4% improvement in energy absorption. Furthermore, the deformation behavior of sandwich panels and core units is analyzed to determine that both the formation of more plastic hinges and a larger deformation region than those observed in classic RH cores promote the better blast resistance of RRH cored sandwich panels. Additionally, a parametric analysis is carried out to suggest that increasing the core thickness and catenary height of RRH units can further improve the anti-blast performance.

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引用次数: 0

Data-Driven Mean-Field Homogenization: Enhancing the accuracy of the Mori-Tanaka method

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-20 DOI: 10.1016/j.compstruct.2025.118985

Witold Ogierman

The Mori-Tanaka method is well-known for its good predictive capabilities and excellent time efficiency. However, a significant weakness of the Mori-Tanaka method is its decreasing accuracy as the volume fraction of particles increases. Therefore, this paper focuses on developing a new approach to improve stiffness predictions for particle-reinforced composites across a wide range of particle volume fractions by using a mixed data-driven and mean-field homogenization modelling strategy. The basic idea is to modify the strain concentration tensor by fitting the results of Mori-Tanaka homogenization to data generated using numerical full-field homogenization based on the representative volume element (RVE). The modified tensor can then replace the original strain concentration tensor within the established framework of Mori-Tanaka homogenization to predict the effective stiffness. The results obtained using the proposed approach are in good agreement with those provided by full-field finite element-based homogenization. Moreover, the results obtained through Mori-Tanaka and double inclusion methods have been added for reference. The presented results demonstrate the potential of the proposed data-driven mean-field model as an efficient approach for addressing the micromechanics of particle-reinforced composites.

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引用次数: 0

Mechanical behaviors of glulam beam-to-column joints strengthened with fiber-reinforced polymer composites: Experimental investigation, numerical analysis and ANN prediction model

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-19 DOI: 10.1016/j.compstruct.2025.118983

Yasemin SIMSEK TURKER, Semsettin KILINCARSLAN, Mehmet AVCAR

Because of its respective advantages, such as high load-bearing capacity relative to their bulk, low embodied carbon and renewable properties, and sustainability, wood is becoming more popular in engineering structures. Due to several effects, some deterioration occurs in wood structures over time, and the load-bearing elements lose their properties, especially the beam-to-column joints. This study investigates the mechanical behaviors of basalt fiber-reinforced polymer (BFRP) and carbon fiber-reinforced polymer (CFRP) glulam beam-to-column joints. Beam-to-column connections are realized using three methods and are wrapped 2, 3, and 4-times. Cycle loading load–displacement experiments are performed on beam-to-column joints. Vital mechanical behaviors, including maximum load-carrying capacity, energy consumption capacity, and stiffness value, are investigated. The data obtained from the experimental study are estimated by creating a model with artificial neural networks (ANNs) and finite element (FE) analysis. The obtained findings show that the effect of reinforcement improves the rigidities, energy consumption capabilities, and load-carrying capacities of beam-to-column joints. In addition, it is observed that the load-carrying capacity of beam-to-column joints increases with the increase in the number of plies. Furthermore, it is determined that the mechanical behaviors of the beam-to-columns strengthened with CFRPs are better than those for BFRPs.

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引用次数: 0

Bio-inspired elastic metamaterial by B-form DNA: Programmable dual helix structures for low-frequency longitudinal wave prohibition

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-19 DOI: 10.1016/j.compstruct.2025.118986

Yumei Chen , Lei Yang , Jia Lou , Ji Wang , Matteo Filippi , Erasmo Carrera , Xiang Fang

Motivated by the attractive mechanical properties and the wealth of biological genetic information carried by the DNA structures, we proposed a novel B-form DNA Dual Helix Metamaterial (DHM) in this paper, which has programmable longitudinal wave propagation properties. A dual helix DNA metamaterial is first designed to follow the natural geometry of the B-form DNA structures. To mimic the programming of genetic information in DNA, four types of mass blocks, each made from different materials (i.e., iron, aluminum, nylon, and foam), are selected to serve as the base pairs within the 3D-printed dual helix frame. The elastic wave propagation properties of the DHM, which have unitary mass blocks of different materials, are first compared to comprehend the encoding characteristics of the dual helix metamaterials. After that, a mixed model of DHM, comprising randomly arranged mass blocks, is used to reveal the extensive programmable features for elastic wave propagation. In addition, the influence of the structure parameters, including the helix’s size and the base plates’ thickness, are investigated. Finally, a laser vibrometer system is used to validate the analysis of the proposed elastic metamaterial, experimentally. The investigation in this paper paves the way for broadband low-frequency vibration isolation for engineering applications.

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引用次数: 0

The impact of additive manufacturing induced geometric defects on auxetic lattices

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-19 DOI: 10.1016/j.compstruct.2025.118968

Garth C. Egan, Alexander J. Angilella, Casey R. Corrado, William V. Skelton Jr

While additive manufacturing (AM) has enabled fabrication of intricate features necessary for metamaterials and other lattice structures, it may introduce defects when designs approach the resolution limits of a system. This work examined and quantified the effects of geometric deviations that resulted from AM processes. Reentrant auxetic cells were manufactured at a variety of scales (wall thicknesses of 125–1000 µm) using stereolithography (SLA) and powder bed fusion (PBF). Part inspection revealed a range of small-scale geometric defects, including variation of 20–25 % in the wall thickness when fabricating samples with dimensions approaching the minimum feature size of a printer. Agreement with simulations also grew worse with decreasing sizes, but some defects could be incorporated into the simulations to improve alignment with experiment. Based on these results, it is recommended that the impact of fabrication defects be accounted for when features size approaches approximately 3x the characteristic size of the printing process.

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引用次数: 0

Dynamic and static behaviour of geopolymer concrete for sustainable infrastructure development: Prospects, challenges, and performance review

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-18 DOI: 10.1016/j.compstruct.2025.118984

Amer Hassan, Chunwei Zhang

Geopolymer concrete (GPC) is increasingly recognized as a sustainable and environmental option to conventional concrete due to its utilization of industrial byproducts. This paper thoroughly investigates the dynamic and static behaviour of GPC, focusing on its mechanical properties, durability, and resistance to impact and seismic loads. Also, this article compares the experimental results reported in previous studies with a predicted model to justify the results obtained by experiments. According to the evaluation and review of previous studies, it could be summarised that no individual factor influences the structural properties of GPC. Additionally, efforts should be made to determine the interrelationship between various factors in order to facilitate the creation of a GPC that is both cost-effective and sustainable for the environment. Further, emphasis is placed on fibre reinforcement, which enhances the material’s dynamic performance. Also, the dynamic behaviour of GPC, including impact and seismic resistance, is still uncertain due to the lack of studies on this subject, and more investigation on this matter must be undertaken to generate a comprehensive picture of the dynamic behaviour of these materials before introducing them to the industry.

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引用次数: 0

Free vibrations of higher-order quasi-3D viscoelastic bi-directional functionally graded plates

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-17 DOI: 10.1016/j.compstruct.2025.118972

Behrouz Karami , Mergen H. Ghayesh , Nicholas Fantuzzi , Krzysztof Kamil Żur

This study introduces a quasi-3D shear deformation theory to analyse the coupled eight-parameter dynamics of bi-directional functionally graded Kelvin-Voigt viscoelastic plates. By focusing on the quasi-3D formulation, this work uniquely captures the influence of continuous axial and thickness gradation in material properties, utilising a power-law rule to determine effective properties. Viscoelasticity is modelled using the Kelvin-Voigt model to incorporate the energy dissipation of the composite plate structure. Eight governing equations, which are coupled through the in-plane and out-of-plane motions including stretching, are derived via Hamilton’s variational principle. A multi-modal discretisation is conducted using a weighted-residual method as the proposed solution for the in-plane and out-of-plane displacements. Thereafter, a numerical technique is employed to solve the resultant equations, obtaining both the real and imaginary parts of the natural frequencies. The proposed model is validated for the natural frequencies with an elastic counterpart from the literature; a homogenous version of the model is also validated against literature. The results obtained not only provide a comprehensive understanding of how the bi-directional functionally graded viscoelastic material and geometrical parameters influence the coupled eight-parameter dynamics of composite straight plates, but also propose a reliable benchmark for such systems through a quasi-3D model. The investigation revealed that the difference in frequency resulting from the application of both 2D and quasi-3D theories is most dominant in the case of thick plates.

{"title":"Free vibrations of higher-order quasi-3D viscoelastic bi-directional functionally graded plates","authors":"Behrouz Karami , Mergen H. Ghayesh , Nicholas Fantuzzi , Krzysztof Kamil Żur","doi":"10.1016/j.compstruct.2025.118972","DOIUrl":"10.1016/j.compstruct.2025.118972","url":null,"abstract":"<div><div>This study introduces a quasi-3D shear deformation theory to analyse the coupled eight-parameter dynamics of bi-directional functionally graded Kelvin-Voigt viscoelastic plates. By focusing on the quasi-3D formulation, this work uniquely captures the influence of continuous axial and thickness gradation in material properties, utilising a power-law rule to determine effective properties. Viscoelasticity is modelled using the Kelvin-Voigt model to incorporate the energy dissipation of the composite plate structure. Eight governing equations, which are coupled through the in-plane and out-of-plane motions including stretching, are derived via Hamilton’s variational principle. A multi-modal discretisation is conducted using a weighted-residual method as the proposed solution for the in-plane and out-of-plane displacements. Thereafter, a numerical technique is employed to solve the resultant equations, obtaining both the real and imaginary parts of the natural frequencies. The proposed model is validated for the natural frequencies with an elastic counterpart from the literature; a homogenous version of the model is also validated against literature. The results obtained not only provide a comprehensive understanding of how the bi-directional functionally graded viscoelastic material and geometrical parameters influence the coupled eight-parameter dynamics of composite straight plates, but also propose a reliable benchmark for such systems through a quasi-3D model. The investigation revealed that the difference in frequency resulting from the application of both 2D and quasi-3D theories is most dominant in the case of thick plates.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"359 ","pages":"Article 118972"},"PeriodicalIF":6.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Static analysis of FGM plates using a general higher-order shear deformation theory

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-16 DOI: 10.1016/j.compstruct.2025.118944

Abdullah Müsevitoğlu , Atilla Özütok , J.N. Reddy

In Functionally Graded Materials (FGMs) material properties vary continuously through the thickness, avoiding any material mismatch. Cracking and delamination are common problems in laminated composite materials, primarily due to material discontinuities between layers, and FGM plates overcome this drawback. The present study focuses on the static analysis of FGM plates using a general High-Order Shear Deformation Theory. The governing equations are derived using the principle of virtual displacements. The Gâteaux differential approach was employed to reformulate the governing equations to construct the mixed finite element model of the FGM plates. The behavior of FGM plates under sinusoidal and uniform loading, with simply supported and clamped boundary conditions was investigated. The results for the displacement, force, and moment components were examined based on multiple different thickness functions (f(z)). The obtained results were compared with those from different theories in the literature, and it was found that the results are consistent and accurate.

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Buckling and bending analysis of FGP nanoplates resting on Pasternak foundation considering non-local and surface effects simultaneously using pb2-Ritz method

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-16 DOI: 10.1016/j.compstruct.2025.118971

Xuan-Trung Dang , Van-Long Nguyen , Minh-Tu Tran , Bich-Phuong Nguyen-Thi , Tien-Thinh Le

For nanoplate structures, due to the large surface-area-to-volume ratio, surface stress exhibits a great influence on the mechanical behavior of the structure. This paper develops a semi-analytical solution using the pb2-Ritz method for bending and buckling analysis of functionally graded porous nanoplates, considering simultaneously non-local and surface effects. The equilibrium equations for the nanoplate on the Pasternak elastic foundation according to Reddy’s third-order shear deformation theory are established based on the principle of minimum potential energy. The critical load in buckling analysis and deflection in the nanoplate subjected to bending are determined through semi-analytical solutions for different types of boundary conditions. The influence of the surface effect, non-local parameters, material parameters, elastic foundation and boundary conditions on the bending and buckling behaviors of the nanoplate is demonstrated through numerical examples. The numerical solutions and theoretical advances reported here provide important insights for surface energy and nonlocal theories of nanoplate structures.

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