Composite Structures最新文献

Structure failure and strength evaluation of honeycomb-based sandwich composites under variable hydro-thermal-mechanical load

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-30 DOI: 10.1016/j.compstruct.2024.118763

Y.J. Cui , Q. Zhou , Z.H. Xu , B.L. Wang , X.Q. Fang , K.F. Wang , B. Wang

{"title":"Structure failure and strength evaluation of honeycomb-based sandwich composites under variable hydro-thermal-mechanical load","authors":"Y.J. Cui , Q. Zhou , Z.H. Xu , B.L. Wang , X.Q. Fang , K.F. Wang , B. Wang","doi":"10.1016/j.compstruct.2024.118763","DOIUrl":"10.1016/j.compstruct.2024.118763","url":null,"abstract":"<div><div>The high-strength and lightweight sandwich structures have broad application prospect in aerospace, wind turbine generator, traffic and civil engineering. The sandwich structures usually service with severe environment and complicated mechanical load, structure failure and strength prediction are crucial issues. Under time-varying and optional position hydro-thermal–mechanical loading, this paper systematically analyzes strength failure, buckling and delamination of a sandwich beam with carbon fiber-reinforced polymer face sheet and aluminum honeycomb core. Effects of elastic boundary conditions, hydrothermal stress, configuration of honeycomb cell and thickness of face sheet on failure pattern and critical failure loading are evaluated. The theoretical deformation model is verified by performing a bending experiment of cantilever beam. For the honeycomb core with small re-entrant angle and shot horizontal cell wall, the sandwich cantilever beam occurs strength failure of face sheet and delamination is happened in simply supported beam. With increase of re-entrant angle and cell wall length, buckling of horizontal cell wall becomes the primary failure pattern of sandwich beam. With thickness increase of face sheet, the failure pattern switches from face sheet’s strength failure to delamination. The critical load for delamination decreases to a volley value and then increases with thickness of face sheet.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"354 ","pages":"Article 118763"},"PeriodicalIF":6.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comparative study on drilling characteristics of unidirectional thermosetting CF/epoxy and thermoplastic CF/PEEK composites

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-29 DOI: 10.1016/j.compstruct.2024.118764

Zhijian Meng, Shunuan Liu, Shiming Liang, Tao Wang, Bin Luo, Kaifu Zhang

{"title":"A comparative study on drilling characteristics of unidirectional thermosetting CF/epoxy and thermoplastic CF/PEEK composites","authors":"Zhijian Meng, Shunuan Liu, Shiming Liang, Tao Wang, Bin Luo, Kaifu Zhang","doi":"10.1016/j.compstruct.2024.118764","DOIUrl":"10.1016/j.compstruct.2024.118764","url":null,"abstract":"<div><div>Thermoplastic carbon fiber reinforced polyetheretherketone (CF/PEEK) composites are increasingly utilized as substitutes for thermosetting carbon fiber reinforced epoxy (CF/epoxy) composites in high-end equipment, due to their superior mechanical performance and sustainable manufacturability. For both composite components, drilling is an indispensable operation in the manufacturing process. To distinguish the drilling characteristics of the two composites, comparative experiments on drilling unidirectional CF/epoxy and CF/PEEK under different parameters were conducted in this paper. Several aspects, including chip formation, drilling temperature, thrust force, hole damage, and dimensional accuracy, were examined. Particularly, the impact of fiber cutting angle on exit and hole wall damage was considered. Results demonstrate that due to the higher ductility and toughness of PEEK, CF/PEEK produces continuous chips, higher drilling temperatures, higher thrust forces, and smaller damage areas than that of CF/epoxy. However, CF/PEEK has more serious hole wall subsurface damage and poorer dimensional accuracy since PEEK is sensitive to temperature. Consequently, unlike CF/epoxy, increasing spindle speeds at the low feed cannot improve the hole quality of CF/PEEK. Moreover, the hole damage distribution of both composites is strongly associated with the fiber cutting angle. This study provides guidance for high-performance machining of CF/PEEK.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"354 ","pages":"Article 118764"},"PeriodicalIF":6.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring deformability in 3D tufted composite reinforcements: Understanding bending behaviors in forming applications

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-29 DOI: 10.1016/j.compstruct.2024.118753

Hao Shen , Jue Zhao , Shenglei Xiao , Peng Wang

{"title":"Exploring deformability in 3D tufted composite reinforcements: Understanding bending behaviors in forming applications","authors":"Hao Shen , Jue Zhao , Shenglei Xiao , Peng Wang","doi":"10.1016/j.compstruct.2024.118753","DOIUrl":"10.1016/j.compstruct.2024.118753","url":null,"abstract":"<div><div>In simulations, the bending stiffness of fibrous reinforcements plays a crucial role in accurately predicting the morphology of wrinkle defects during the forming process. Three-dimensional (3D) tufted reinforcements exhibit distinct bending behaviors compared to traditional two-dimensional (2D) reinforcements due to the presence of tufting yarns in the thickness direction. This study employs cantilever bending tests to measure the bending stiffness of tufted reinforcements, examining the effects of various parameters, including tufting points, tufting distribution, number of layers, and tufting loop length, on their bending behavior. The experimental results show that through-thickness tufting yarns significantly enhance the bending stiffness of multilayered reinforcements, but have little impact on single-layer reinforcements. The improvement in bending stiffness is nonlinearly related to the number of tufting points, fabric layers, and tufting loop length, while tufting distribution has no effect. The underlying mechanisms of these tufting parameters are analyzed, and an analytical model is developed to explain the influence of tufting loop length.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"354 ","pages":"Article 118753"},"PeriodicalIF":6.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lamb wave S0/A0 mode conversion for imaging the internal structure of composite panel

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-28 DOI: 10.1016/j.compstruct.2024.118748

T. Wandowski, M. Radzienski, P. Kudela

{"title":"Lamb wave S0/A0 mode conversion for imaging the internal structure of composite panel","authors":"T. Wandowski, M. Radzienski, P. Kudela","doi":"10.1016/j.compstruct.2024.118748","DOIUrl":"10.1016/j.compstruct.2024.118748","url":null,"abstract":"<div><div>Stiffened structures are utilised in various industries and their structural assessment is of paramount importance. In this paper, a novel, automated algorithm for internal structure imaging based on S<sub>0</sub>/A<sub>0</sub> mode conversion effect is proposed. Moreover, a contrast indicator for the quantitative characterisation of structure imaging results was introduced. The research is exclusively experimental and focuses on fibre-reinforced, stiffened aerospace composite panel. Both non-contact (air-coupled transducer-ACT) and contact (piezoelectric transducer-PZT) methods of elastic wave generation were investigated. Low-frequency (40 kHz) wave generation was applied to ACT and PZT, while high-frequency excitations (100 kHz and 180 kHz) were analysed for the PZT. The results obtained for both excitation methods were compared. Full wavefield signals of elastic wave propagation were registered with a scanning laser Doppler vibrometer. The S<sub>0</sub>/A<sub>0</sub> mode conversion observed on the specimens stiffeners led to the development of a new algorithm based on time–space guided wave signal filtering, which enables the imaging of the internal structure of the stiffened panel. The efficacy of the developed algorithm was proved to be higher than conventional weighted RMS (WRMS) and wave irregularity mapping (WIM) algorithms. The proposed method allows for the generation of easily interpretable maps illustrating discontinuities in the examined structure. The contrast indicator is two times higher for the proposed MCWA than for WRMS and WIM for wave frequency 100 kHz and three times higher for frequency 180 kHz.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118748"},"PeriodicalIF":6.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-point bending behaviors of sandwich beams with data-driven 3D auxetic lattice core based on deep learning

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-28 DOI: 10.1016/j.compstruct.2024.118751

Xi Fang, Hui-Shen Shen, Hai Wang

{"title":"Three-point bending behaviors of sandwich beams with data-driven 3D auxetic lattice core based on deep learning","authors":"Xi Fang, Hui-Shen Shen, Hai Wang","doi":"10.1016/j.compstruct.2024.118751","DOIUrl":"10.1016/j.compstruct.2024.118751","url":null,"abstract":"<div><div>In this paper, flexural behavior of a novel sandwich beam featuring a 3D auxetic lattice core developed using an inverse design method powered by deep learning under three-point bending is investigated. Specifically, the bending behavior and effective Poisson’s ratio (EPR) of such beams under large deflection is demonstrated. With inverse design method based on conditional generative deep learning model, finite element analysis (FEA) results indicate that the sandwich beams with data-driven auxetic core have superior bending behavior compared to those obtained through forward topology optimization in previous studies. In order to validate the mechanical performances of data-driven 3D auxetic lattice structures and further explore the influence of incline angle on the EPR, experimental tests under uniform pressure are carried out with metal specimens fabricated through selective laser melting manufacturing process. Comprehensive FE simulations, incorporating analytical model and temperature-dependent material properties explore the effect of various factors on the bending behavior and EPR as the beam undergoes large deflection. Results demonstrate that functionally graded configurations, length-to-thickness ratio, facesheet-to-core thickness ratio, truss radii, and thermal environmental conditions will significantly affect the flexural behavior and EPR of the data-driven sandwich beam.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"354 ","pages":"Article 118751"},"PeriodicalIF":6.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrasonic detection and evaluation of delamination defects in carbon fiber composites based on finite element simulation

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-28 DOI: 10.1016/j.compstruct.2024.118749

Ziang Jing , Gaoshen Cai , Xiang Yu , Bingxu Wang

{"title":"Ultrasonic detection and evaluation of delamination defects in carbon fiber composites based on finite element simulation","authors":"Ziang Jing , Gaoshen Cai , Xiang Yu , Bingxu Wang","doi":"10.1016/j.compstruct.2024.118749","DOIUrl":"10.1016/j.compstruct.2024.118749","url":null,"abstract":"<div><div>Delamination defects are prone to occur during the production and use of carbon fiber composites, which seriously affect the mechanical properties of the material. The production cost of carbon fiber composites is high, and it is difficult to create defect samples. In light of this, a method for ultrasonic testing of delamination defects in carbon fiber composites based on finite element simulation was studied, and the test results were evaluated accordingly. First, a finite element model of the carbon fiber composite material was established using COMSOL software, and ultrasonic testing was employed to detect delamination defects of varying sizes and positions. Next, ultrasonic detection signals and sound field cloud images were obtained through simulation. Finally, quantitative positioning detection was conducted by fabricating laminated carbon fiber composite samples with embedded delamination defects. The results indicate that the finite element model accurately reflects the sound field propagation of ultrasonic waves. The simulated and experimental waveform signals show high consistency in both amplitude and time-domain positioning, with an error margin within 3%. The simulation model exhibits good reliability. This study provides a time-saving, labor-saving, and cost-effective approach for the detection and analysis of defects in carbon fiber composites.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118749"},"PeriodicalIF":6.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A multi-scale uncertainty analysis method based on the Hermite–Chebyshev polynomials for dynamic responses of FRP composite structures with hybrid uncertainties

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-26 DOI: 10.1016/j.compstruct.2024.118713

Sheng-Yu Qian , Xiao-Yi Zhou , Neng-Wei Wang

引用次数: 0

Characterization of Direct Ink Writing carbon fiber composite structures with serial sectioning and DREAM.3D

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-26 DOI: 10.1016/j.compstruct.2024.118730

Kenneth M. Clarke , Michael Groeber , John Wertz , Andrew Abbott , Roneisha Haney , Michael Chapman

{"title":"Characterization of Direct Ink Writing carbon fiber composite structures with serial sectioning and DREAM.3D","authors":"Kenneth M. Clarke , Michael Groeber , John Wertz , Andrew Abbott , Roneisha Haney , Michael Chapman","doi":"10.1016/j.compstruct.2024.118730","DOIUrl":"10.1016/j.compstruct.2024.118730","url":null,"abstract":"<div><div>Direct Ink Writing (DIW) combines the flexibility of 3D printing with increased material applications such as thermoset carbon fiber composites, ceramic composites, and metals. The usefulness of direct ink writing, like many additive manufacturing (AM) processes, remains limited for reasons ranging from quality control to lack of process parameter optimization. This study looks to introduce a methodology for characterizing direct ink written carbon fiber composites to facilitate exploration into the relationships between process parameters and material structure. The presented study utilized nine 3D specimens of direct ink writing carbon fiber composites printed with varying process parameters – speed differential, layer height, step-over distance, and nozzle diameter – as the data set. The data was collected with an automatic serial sectioning system, LEROY, from the Air Force Research Laboratory. The collected data was processed in DREAM.3D and analyzed with statistical comparisons of 2D orientation distributions of the fibers, 2D size distributions of the voids, and 2D shape distributions of the voids.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118730"},"PeriodicalIF":6.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical prediction of impact damage in thick fabric composite laminates 厚织物复合材料层压板冲击损伤的数值预测

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-26 DOI: 10.1016/j.compstruct.2024.118726

Niels van Hoorn , Sergio Turteltaub , Christos Kassapoglou , Wouter van den Brink

{"title":"Numerical prediction of impact damage in thick fabric composite laminates","authors":"Niels van Hoorn , Sergio Turteltaub , Christos Kassapoglou , Wouter van den Brink","doi":"10.1016/j.compstruct.2024.118726","DOIUrl":"10.1016/j.compstruct.2024.118726","url":null,"abstract":"<div><div>A simulation methodology for assessing the damage in thick fabric Carbon Fibre Reinforced Polymer (CFRP) composite laminates under low- and high-velocity impacts is presented. It encompasses steps for calibration, verification, and validation of the elastic and fracture material properties as well as determination of model parameters for the numerical simulations. Damage is modelled using a discrete fracture approach with cohesive interface elements that capture individual cracks occurring in and between plies. For computational efficiency, the method is implemented in a two-dimensional (2D) axi-symmetric model. Results from double-cantilever beam, end-notched flexure, and quasi-static indentation experiments align well with numerical simulations and serve to calibrate and verify the implementation of the discrete fracture approach. The methodology is extended to dynamic impact analysis to predict damage mechanisms, force–displacement histories, and is validated using test results. This methodology combines meaningful insight in the failure mechanisms with a manageable computational effort, achieving a factor 50 improvement compared to a benchmark. A parametric analysis summarised in failure maps relates damage mechanisms to impact energy, mass, and laminate thickness. The proposed methodology strikes a balance between computational efficiency and accuracy, making it a valuable tool for optimum design and certification of thick CFRP composite laminates under impact.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118726"},"PeriodicalIF":6.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722731","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

Geometrically nonlinear analysis of composite beams based on global–local superposition

IF 6.3 2区材料科学

Composite Structures Pub Date : 2024-11-26 DOI: 10.1016/j.compstruct.2024.118732

Alfredo R. de Faria , Jürgen A. Baier-Saip , André S. de Lima

{"title":"Geometrically nonlinear analysis of composite beams based on global–local superposition","authors":"Alfredo R. de Faria , Jürgen A. Baier-Saip , André S. de Lima","doi":"10.1016/j.compstruct.2024.118732","DOIUrl":"10.1016/j.compstruct.2024.118732","url":null,"abstract":"<div><div>A composite beam finite element is designed to capture through-thickness effects, specifically normal stress and strain and transverse shear, in the context of geometrically nonlinear analyses. The starting point for the formulation is a similar element already proposed for linear analyzes based on a global–local superposition approach, where local functions are defined in each layer of the laminate, and global functions are defined along the thickness. The consistency of the kinematic hypotheses is guaranteed by imposing the continuity equations of displacements through the thickness, the force balance equations along the thickness, directly or indirectly, by imposing the continuity of transverse stresses, and by applying the boundary conditions on the lower and upper surfaces of the elements. In the context of nonlinear analyzes, the imposition of continuity of displacements is straightforward. However, the continuity of the transverse stresses needs to be carefully imposed, as the relevant stresses are the second order Piola-Kirchhoff stresses and the strains are the Green-Lagrange strains, consistent with the total Lagrangian approach used. The constitutive equations are written in incremental form and a detailed analysis is conducted to ensure that the stresses and strains involved are physically consistent across the different reference frames employed. In order to assess the accuracy of the numerical model implemented, a unique semi-analytical technique is developed to obtain the response of asymmetrical laminated beams under compression.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"353 ","pages":"Article 118732"},"PeriodicalIF":6.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0