Pub Date : 2024-02-24DOI: 10.1177/00219983241235151
Ziping Wang, Hangrui Cui, Yue Fei, Bingqian Li, Rahim Gorgin
The use of composite plate structures has become increasingly prevalent in industries such as civil engineering, aerospace, high-speed rail, automotive, and wind power. However, the propagation of ultrasonic Lamb waves in these structures is subject to multi-modal and frequency dispersion effects, which, coupled with the complicated anisotropic propagation mechanism of composite materials, makes it challenging to extract damage scatter signals without a health signal as a reference. In this study, we apply the frequency-wavenumber ( f- k) domain filter wavefront modal method to carbon fiber reinforced polymer (CFRP) materials and use a three-dimensional (3D) window function to achieve different modalities and their corresponding damage reflection signals in the absence of a reference dispersion curve. Single modal damage imaging is achieved using a common source method (CSM) by laser vibration scanning experiment. To effectively extract single modalities in laminate material damage detection, a 3D filter window function was constructed. Considering the skew angle correction, it can effectively remove the direct wave signal, so as to realize the imaging of the damage.
{"title":"Research laser scanning damage detection method in f-k domain for laminate composite material","authors":"Ziping Wang, Hangrui Cui, Yue Fei, Bingqian Li, Rahim Gorgin","doi":"10.1177/00219983241235151","DOIUrl":"https://doi.org/10.1177/00219983241235151","url":null,"abstract":"The use of composite plate structures has become increasingly prevalent in industries such as civil engineering, aerospace, high-speed rail, automotive, and wind power. However, the propagation of ultrasonic Lamb waves in these structures is subject to multi-modal and frequency dispersion effects, which, coupled with the complicated anisotropic propagation mechanism of composite materials, makes it challenging to extract damage scatter signals without a health signal as a reference. In this study, we apply the frequency-wavenumber ( f- k) domain filter wavefront modal method to carbon fiber reinforced polymer (CFRP) materials and use a three-dimensional (3D) window function to achieve different modalities and their corresponding damage reflection signals in the absence of a reference dispersion curve. Single modal damage imaging is achieved using a common source method (CSM) by laser vibration scanning experiment. To effectively extract single modalities in laminate material damage detection, a 3D filter window function was constructed. Considering the skew angle correction, it can effectively remove the direct wave signal, so as to realize the imaging of the damage.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"8 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-20DOI: 10.1177/00219983241236206
Abel Eslava-Hernández, Julio A Rodríguez-González, Carlos Rubio-González, Armando I Martínez-Pérez, Edgar E Vera-Cárdenas
This study presents the effect caused by the saline environment (artificial seawater) on the physical and tribological properties of laminated composite materials reinforced with aramid fibers when they are subjected to erosive wear by sand particles. Composite materials made by epoxy resin and reinforced with glass fiber, carbon fiber and hybrid fiber (aramid with carbon) were studied. The laminates were superficially reinforced with layers of Kevlar fiber and prepared by the vacuum-assisted resin infusion process. The samples were subjected to a seawater accelerated aging process at 70°C for 1122 h. To reproduce erosive wear conditions of marine structural components, sea sand was used as solid particle under conditions of 4.5 bar of pressure, impact speed of 4.7 m/s and impact angle of 90°. The results showed that aged materials absorb more impact energy with respect to unaged counterparts, causing less material loss and a less depth in the wear track. The information generated by this research work may serve for the design and durability analysis of marine structures such as tidal turbine blades.
{"title":"Effect of seawater aging on the erosive wear response of aramid fiber reinforced composites","authors":"Abel Eslava-Hernández, Julio A Rodríguez-González, Carlos Rubio-González, Armando I Martínez-Pérez, Edgar E Vera-Cárdenas","doi":"10.1177/00219983241236206","DOIUrl":"https://doi.org/10.1177/00219983241236206","url":null,"abstract":"This study presents the effect caused by the saline environment (artificial seawater) on the physical and tribological properties of laminated composite materials reinforced with aramid fibers when they are subjected to erosive wear by sand particles. Composite materials made by epoxy resin and reinforced with glass fiber, carbon fiber and hybrid fiber (aramid with carbon) were studied. The laminates were superficially reinforced with layers of Kevlar fiber and prepared by the vacuum-assisted resin infusion process. The samples were subjected to a seawater accelerated aging process at 70°C for 1122 h. To reproduce erosive wear conditions of marine structural components, sea sand was used as solid particle under conditions of 4.5 bar of pressure, impact speed of 4.7 m/s and impact angle of 90°. The results showed that aged materials absorb more impact energy with respect to unaged counterparts, causing less material loss and a less depth in the wear track. The information generated by this research work may serve for the design and durability analysis of marine structures such as tidal turbine blades.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"37 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-20DOI: 10.1177/00219983241235855
Aravind Balaji, Claudio Sbarufatti, David Dumas, Antoine Parmentier, Olivier Pierard, Francesco Cadini
The work aims to enhance the capabilities of a Finite Element tool, specifically related to a rheological thermo-chemo-viscoelastic constitutive model. This enhancement is intended to improve the tool’s ability to predict the distortions in composite parts caused by the polymerization of the thermoset composite matrix. These distortions occur due to internal residual stress generated by the inherent anisotropic properties of the thermoset composite material, including coefficients of thermal expansion and chemical shrinkage. The research work’s improvement is tied to the precise modelling of curing behaviour, which literature acknowledges as having a significant impact on manufacturing defects. In order to accommodate the influence of curing behaviour on various process variables—specifically, different thermal loading rates—a neural network model is implemented as an alternative to a standard diffusion cure-kinetics model. The neural network model is trained using Differential Scanning Calorimetry data and is integrated with the classical visco-elastic constitutive model to more accurately predict the progression of distinct thermoset resin states. This transition between cure states is assessed using two cure state variables: the degree of cure and the glass transition temperature. The enhanced predictions of state transitions lead to accurate assessments of internal residual stresses, especially when dealing with thick components subjected to thermal fluctuations. The anisotropic properties of thermoset composites, crucial for numerical analysis, are captured at various stages of cure. Ultimately, this methodology is employed to compare process-induced defects in the case study of the Z-shaped carbon/epoxy woven part, and the defects closely align with experimental measurements.
这项工作旨在增强有限元工具的功能，特别是与流变热-热-粘弹性构成模型有关的功能。这一改进旨在提高该工具预测热固性复合材料基体聚合引起的复合材料部件变形的能力。这些变形是由于热固性复合材料固有的各向异性（包括热膨胀系数和化学收缩系数）产生的内部残余应力造成的。这项研究工作的改进与固化行为的精确建模息息相关，文献承认固化行为对制造缺陷有重大影响。为了适应固化行为对各种工艺变量的影响，特别是不同的热负荷率，我们采用了神经网络模型来替代标准的扩散固化动力学模型。神经网络模型使用差示扫描量热数据进行训练，并与经典的粘弹性构成模型相结合，以更准确地预测不同热固性树脂状态的进展。固化状态之间的过渡是通过两个固化状态变量来评估的：固化程度和玻璃化转变温度。对状态转变的预测增强了对内部残余应力的准确评估，尤其是在处理受热波动影响的厚部件时。热固性复合材料的各向异性对数值分析至关重要，在固化的各个阶段都能捕捉到。最终，在 Z 形碳/环氧编织部件的案例研究中，采用这种方法比较了工艺引起的缺陷，缺陷与实验测量结果非常吻合。
{"title":"Prediction of shape distortions in thermosetting composite parts using neural network interfaced visco-elastic constitutive model","authors":"Aravind Balaji, Claudio Sbarufatti, David Dumas, Antoine Parmentier, Olivier Pierard, Francesco Cadini","doi":"10.1177/00219983241235855","DOIUrl":"https://doi.org/10.1177/00219983241235855","url":null,"abstract":"The work aims to enhance the capabilities of a Finite Element tool, specifically related to a rheological thermo-chemo-viscoelastic constitutive model. This enhancement is intended to improve the tool’s ability to predict the distortions in composite parts caused by the polymerization of the thermoset composite matrix. These distortions occur due to internal residual stress generated by the inherent anisotropic properties of the thermoset composite material, including coefficients of thermal expansion and chemical shrinkage. The research work’s improvement is tied to the precise modelling of curing behaviour, which literature acknowledges as having a significant impact on manufacturing defects. In order to accommodate the influence of curing behaviour on various process variables—specifically, different thermal loading rates—a neural network model is implemented as an alternative to a standard diffusion cure-kinetics model. The neural network model is trained using Differential Scanning Calorimetry data and is integrated with the classical visco-elastic constitutive model to more accurately predict the progression of distinct thermoset resin states. This transition between cure states is assessed using two cure state variables: the degree of cure and the glass transition temperature. The enhanced predictions of state transitions lead to accurate assessments of internal residual stresses, especially when dealing with thick components subjected to thermal fluctuations. The anisotropic properties of thermoset composites, crucial for numerical analysis, are captured at various stages of cure. Ultimately, this methodology is employed to compare process-induced defects in the case study of the Z-shaped carbon/epoxy woven part, and the defects closely align with experimental measurements.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"2016 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-19DOI: 10.1177/00219983241235857
Alireza Moradi, Reza Ansari, Mohammad Kazem Hassanzadeh-Aghdam, Jamaloddin Jamali
The optimal performance of composites enriched with hollow spheres has been reported in contemporary literature, whereas their thermal properties have received less attention. In this regard, a finite element method (FEM)-based micromechanical model has been developed systematically to investigate the role of intra-matrix embedding of hollow spheres on the thermal conductivity and coefficient of thermal expansion (CTE) of unidirectional fiber-reinforced hybrid composites. In so doing, the concept of representative volume element (RVE) considers microstructures comprising an epoxy matrix, E-glass fiber, and E-glass hollow spheres, assuming perfect bonding (ideal interface) between the components and modified approximate periodic boundary conditions. By computing the longitudinal and transverse temperature gradients generated due to the application of uniform heat flux as well as the geometrical variation in RVE owing to temperature enhancement, thermal conductivity and CTE have been respectively determined. Comprehensive evaluations have been conducted to examine the effects of microstructural-level features, including fiber volume content and orientation, plus volume content and thickness of hollow spheres, on the effective thermal conductivity and CTE of pseudo-porous ternary E-glass/epoxy composites.
当代文献报道了富含空心球复合材料的最佳性能，但对其热性能的关注较少。为此，我们系统地开发了一种基于有限元法（FEM）的微机械模型，以研究基体内嵌入空心球对单向纤维增强混合复合材料的热导率和热膨胀系数（CTE）的影响。在此过程中，代表体积元素（RVE）的概念考虑了由环氧树脂基体、E-玻璃纤维和 E-玻璃空心球组成的微结构，假设各组分之间完美粘合（理想界面），并修改了近似周期性边界条件。通过计算均匀热通量产生的纵向和横向温度梯度，以及温度升高导致的 RVE 几何变化，分别确定了热导率和 CTE。我们进行了综合评估，以研究微结构层面的特征（包括纤维体积含量和取向，以及中空球体的体积含量和厚度）对假多孔三元 E 玻璃/环氧树脂复合材料的有效热导率和 CTE 的影响。
{"title":"Numerical prediction of thermal conductivity and thermal expansion coefficient of glass fiber-reinforced polymer hybrid composites filled with hollow spheres","authors":"Alireza Moradi, Reza Ansari, Mohammad Kazem Hassanzadeh-Aghdam, Jamaloddin Jamali","doi":"10.1177/00219983241235857","DOIUrl":"https://doi.org/10.1177/00219983241235857","url":null,"abstract":"The optimal performance of composites enriched with hollow spheres has been reported in contemporary literature, whereas their thermal properties have received less attention. In this regard, a finite element method (FEM)-based micromechanical model has been developed systematically to investigate the role of intra-matrix embedding of hollow spheres on the thermal conductivity and coefficient of thermal expansion (CTE) of unidirectional fiber-reinforced hybrid composites. In so doing, the concept of representative volume element (RVE) considers microstructures comprising an epoxy matrix, E-glass fiber, and E-glass hollow spheres, assuming perfect bonding (ideal interface) between the components and modified approximate periodic boundary conditions. By computing the longitudinal and transverse temperature gradients generated due to the application of uniform heat flux as well as the geometrical variation in RVE owing to temperature enhancement, thermal conductivity and CTE have been respectively determined. Comprehensive evaluations have been conducted to examine the effects of microstructural-level features, including fiber volume content and orientation, plus volume content and thickness of hollow spheres, on the effective thermal conductivity and CTE of pseudo-porous ternary E-glass/epoxy composites.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"35 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-17DOI: 10.1177/00219983241235853
Ahmed Wagih, Harri Junaedi, Hassan A Mahmoud, Gilles Lubineau, Ajay Kumar, Tamer A Sebaey
Low damage tolerance and residual strength are the main drawbacks of carbon fiber composite laminates that limit their application in many lightweight structures. This study demonstrates the exceptional damage tolerance and high fracture toughness of carbon-Kevlar hybrid laminate, where Kevlar plies are placed between two carbon fiber face sheets. Flexural strength after damage and mode I translaminar fracture toughness of carbon and Kevlar and the hybrid laminates were evaluated using three-point bending and single-edge notched bending tests, respectively. The damage mechanisms in the three configurations were investigated using micro-computed tomography and correlated with their mechanical responses. The results showed that the hybrid laminate could sustain 70% of the laminate strength after fiber damage occurs and can sustain the same strength for large strains, unlike carbon and Kevlar fiber laminates, where they both lose their mechanical integrity after fiber breakage. Moreover, this laminate showed 200% and 170% larger specific absorbed energy than carbon and Kevlar laminates, respectively. The improvement can be justified by the propagation of fiber breakage at three different positions in the Kevlar core and the delamination at the carbon-Kevlar interface that allowed larger energy dissipation during fracture. Additionally, it showed 21% and 42.7% larger absolute and specific fracture toughness, respectively, than the carbon fiber laminate.
{"title":"Enhanced damage tolerance and fracture toughness of lightweight carbon-Kevlar fiber hybrid laminate","authors":"Ahmed Wagih, Harri Junaedi, Hassan A Mahmoud, Gilles Lubineau, Ajay Kumar, Tamer A Sebaey","doi":"10.1177/00219983241235853","DOIUrl":"https://doi.org/10.1177/00219983241235853","url":null,"abstract":"Low damage tolerance and residual strength are the main drawbacks of carbon fiber composite laminates that limit their application in many lightweight structures. This study demonstrates the exceptional damage tolerance and high fracture toughness of carbon-Kevlar hybrid laminate, where Kevlar plies are placed between two carbon fiber face sheets. Flexural strength after damage and mode I translaminar fracture toughness of carbon and Kevlar and the hybrid laminates were evaluated using three-point bending and single-edge notched bending tests, respectively. The damage mechanisms in the three configurations were investigated using micro-computed tomography and correlated with their mechanical responses. The results showed that the hybrid laminate could sustain 70% of the laminate strength after fiber damage occurs and can sustain the same strength for large strains, unlike carbon and Kevlar fiber laminates, where they both lose their mechanical integrity after fiber breakage. Moreover, this laminate showed 200% and 170% larger specific absorbed energy than carbon and Kevlar laminates, respectively. The improvement can be justified by the propagation of fiber breakage at three different positions in the Kevlar core and the delamination at the carbon-Kevlar interface that allowed larger energy dissipation during fracture. Additionally, it showed 21% and 42.7% larger absolute and specific fracture toughness, respectively, than the carbon fiber laminate.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"4 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-05DOI: 10.1177/00219983241232194
Mehdi Farajpour, Mehdi A Najafabadi
The objective of this study was to examine the in-plane shear properties of filament-wound composite cylinders and assess the associated damage mechanisms using acoustic emission techniques. Two distinct composite materials, namely carbon/epoxy and glass epoxy, were manufactured for this purpose. The cylinders were subjected to torsion load conditions in accordance with ASTM D5448. Throughout the testing process, various parameters such as torque, angle of torsion, and strain were meticulously recorded. Additionally, the acoustic emission sensors were utilized to capture signals indicating the occurrence of damages. The findings of the study indicate that the in-plane shear strength and shear modulus of the carbon/epoxy specimens surpass those of the glass/epoxy counterparts. The results from acoustic emission testing indicated that in the CFRP specimens, there were no instances of fiber/matrix debonding. Instead, the main mode of damage observed was fiber breakage, accounting for approximately 71% of the total damage detected. On the other hand, in the GFRP specimens, the primary damage mechanism was found to be fiber/matrix debonding, making up approximately 50% of the overall damage recorded.
{"title":"In-plane shear damages consideration of hoop wound composite cylinders using acoustic emission method","authors":"Mehdi Farajpour, Mehdi A Najafabadi","doi":"10.1177/00219983241232194","DOIUrl":"https://doi.org/10.1177/00219983241232194","url":null,"abstract":"The objective of this study was to examine the in-plane shear properties of filament-wound composite cylinders and assess the associated damage mechanisms using acoustic emission techniques. Two distinct composite materials, namely carbon/epoxy and glass epoxy, were manufactured for this purpose. The cylinders were subjected to torsion load conditions in accordance with ASTM D5448. Throughout the testing process, various parameters such as torque, angle of torsion, and strain were meticulously recorded. Additionally, the acoustic emission sensors were utilized to capture signals indicating the occurrence of damages. The findings of the study indicate that the in-plane shear strength and shear modulus of the carbon/epoxy specimens surpass those of the glass/epoxy counterparts. The results from acoustic emission testing indicated that in the CFRP specimens, there were no instances of fiber/matrix debonding. Instead, the main mode of damage observed was fiber breakage, accounting for approximately 71% of the total damage detected. On the other hand, in the GFRP specimens, the primary damage mechanism was found to be fiber/matrix debonding, making up approximately 50% of the overall damage recorded.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"2016 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139951927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-02DOI: 10.1177/00219983241230740
Esranur Yuksel, Osman Eksik, Hanzade Haykiri-Acma, Serdar Yaman
The pairs of nanofillers prepared by graphene nanoplatelets (GNPs) and multi-walled carbon nanotubes (MWCNTs) were added to the epoxy matrix in various ratios to produce hybrid epoxy nanocomposites. The effects of the presence of these nanofillers at 0.1–0.4 wt.% on the mechanical and thermal properties were tested. Likewise, carbon fiber reinforced MWCNT/GNP modified epoxy nanocomposite laminates were also manufactured and tested. The dispersion of nanofiller in the polymer matrix was evaluated by Scanning Electron Microscopy (SEM). It was determined that the hybrid composite consisting of a MWCNT:GNP ratio of 1:3 and a nanofiller ratio of 0.3 wt.% showed the best mechanical properties with a tensile strength of 75.1 MPa. The presence of GNPs and MWCNT nanofillers in epoxy/carbon fiber laminates influenced positively the tensile strength and strain but negatively the elastic modulus. Glass transition temperature of epoxy increased from 87.25°C to 114.67°C for MWCNT:GNP ratio of 1:1 (0.3 wt.%).
{"title":"Mechanical properties of a carbon fiber reinforced epoxy resin composite improved by integrating multi-walled carbon nanotubes and graphene nanoplatelets","authors":"Esranur Yuksel, Osman Eksik, Hanzade Haykiri-Acma, Serdar Yaman","doi":"10.1177/00219983241230740","DOIUrl":"https://doi.org/10.1177/00219983241230740","url":null,"abstract":"The pairs of nanofillers prepared by graphene nanoplatelets (GNPs) and multi-walled carbon nanotubes (MWCNTs) were added to the epoxy matrix in various ratios to produce hybrid epoxy nanocomposites. The effects of the presence of these nanofillers at 0.1–0.4 wt.% on the mechanical and thermal properties were tested. Likewise, carbon fiber reinforced MWCNT/GNP modified epoxy nanocomposite laminates were also manufactured and tested. The dispersion of nanofiller in the polymer matrix was evaluated by Scanning Electron Microscopy (SEM). It was determined that the hybrid composite consisting of a MWCNT:GNP ratio of 1:3 and a nanofiller ratio of 0.3 wt.% showed the best mechanical properties with a tensile strength of 75.1 MPa. The presence of GNPs and MWCNT nanofillers in epoxy/carbon fiber laminates influenced positively the tensile strength and strain but negatively the elastic modulus. Glass transition temperature of epoxy increased from 87.25°C to 114.67°C for MWCNT:GNP ratio of 1:1 (0.3 wt.%).","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"122 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139952013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.1177/00219983241231833
Oussama Ferfari, Ahmed Belaadi, Messaouda Boumaaza, Salah Amroune, Hassan Alshahrani, Mohammad KA Khan
Explore the intriguing world of natural fibers, where Syagrus Romanzoffiana (SR) fibers out as a viable alternative to synthetic and glass fibers in composite materials. Dive into the eco-friendly attraction of SR fibers, which are renowned for their natural degradation and ecologically favorable properties. This novel work investigates the performance characterization of 40 mm gauge-length (GL) SR fibers under quasi-static pressures using rigorous tensile testing. The mystery develops when 200 fibers are examined in seven different test groups, revealing the effect of test quantity ( N) on tensile strength, Young’s modulus, and fracture strain. Given the intrinsic diversity of natural fibers, the study applies strong statistical approaches such as least squares (LS) and maximum likelihood (ML) estimations, as well as two- and three-parameter Weibull distributions. Witness the thorough dispersion and probability analysis, which culminates in an enthralling one-factor analysis of variance (ANOVA) across the seven test groups ( N = 30, 60, 90, 120, 150, 180 and 200) for each tensile strength characteristic. Join us on this scientific trip as we uncover the mysteries and promise of Syagrus Romanzoffiana fibers to shape the future of composite materials.
{"title":"Mechanical properties and statistical analysis of Syagrus Romanzoffiana palm cellulose fibers","authors":"Oussama Ferfari, Ahmed Belaadi, Messaouda Boumaaza, Salah Amroune, Hassan Alshahrani, Mohammad KA Khan","doi":"10.1177/00219983241231833","DOIUrl":"https://doi.org/10.1177/00219983241231833","url":null,"abstract":"Explore the intriguing world of natural fibers, where Syagrus Romanzoffiana (SR) fibers out as a viable alternative to synthetic and glass fibers in composite materials. Dive into the eco-friendly attraction of SR fibers, which are renowned for their natural degradation and ecologically favorable properties. This novel work investigates the performance characterization of 40 mm gauge-length (GL) SR fibers under quasi-static pressures using rigorous tensile testing. The mystery develops when 200 fibers are examined in seven different test groups, revealing the effect of test quantity ( N) on tensile strength, Young’s modulus, and fracture strain. Given the intrinsic diversity of natural fibers, the study applies strong statistical approaches such as least squares (LS) and maximum likelihood (ML) estimations, as well as two- and three-parameter Weibull distributions. Witness the thorough dispersion and probability analysis, which culminates in an enthralling one-factor analysis of variance (ANOVA) across the seven test groups ( N = 30, 60, 90, 120, 150, 180 and 200) for each tensile strength characteristic. Join us on this scientific trip as we uncover the mysteries and promise of Syagrus Romanzoffiana fibers to shape the future of composite materials.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"30 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139951983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-29DOI: 10.1177/00219983241230381
Zhihua Xiong, Yang Meng, Chenyu Zhao, Yuqing Liu, Xiaoyu Liu
To investigate the fatigue performance of perforated and bolted pultruded Glass Fiber Reinforced Polymer (GFRP) laminates, a series of tests are conducted including static tensile and cyclic fatigue test, while Digital Image Correlation (DIC) and CT tests were implemented to monitor strains around the perforations and damage developed in the samples subjected to tensile and fatigue tests respectively. The stress concentrations of the cyclic loaded perforated GFRP laminates are discussed based on the experiment results. Due to the stress limitation of single bolted laminates, the diameter to width ratio is suggested to be less than 0.3. The GFRP laminates with double holes have a better fatigue performance than that of single hole, which is called the double-hole effect. This effect is also found in double bolted GFRP laminates. Considering the strength of the laminates between the holes and to unify the requirement, the critical distance to width ratio is suggested to be 1.6 and the diameter to width ratio should be less than 0.3.
{"title":"Fatigue performance investigation of perforated and bolted pultruded glass fiber reinforced polymer laminates based on experiment and digital images","authors":"Zhihua Xiong, Yang Meng, Chenyu Zhao, Yuqing Liu, Xiaoyu Liu","doi":"10.1177/00219983241230381","DOIUrl":"https://doi.org/10.1177/00219983241230381","url":null,"abstract":"To investigate the fatigue performance of perforated and bolted pultruded Glass Fiber Reinforced Polymer (GFRP) laminates, a series of tests are conducted including static tensile and cyclic fatigue test, while Digital Image Correlation (DIC) and CT tests were implemented to monitor strains around the perforations and damage developed in the samples subjected to tensile and fatigue tests respectively. The stress concentrations of the cyclic loaded perforated GFRP laminates are discussed based on the experiment results. Due to the stress limitation of single bolted laminates, the diameter to width ratio is suggested to be less than 0.3. The GFRP laminates with double holes have a better fatigue performance than that of single hole, which is called the double-hole effect. This effect is also found in double bolted GFRP laminates. Considering the strength of the laminates between the holes and to unify the requirement, the critical distance to width ratio is suggested to be 1.6 and the diameter to width ratio should be less than 0.3.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"37 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139951913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-29DOI: 10.1177/00219983241230379
Naruki Ichihara, Masahito Ueda, Tomohiro Yokozeki
The topology and fiber orientation of fiber-reinforced composite structures must be designed computationally to fully demonstrate their anisotropic mechanical properties. Optimization of the topology and fiber orientation is performed either sequentially or concurrently. In the sequential method, topology optimization is performed first, followed by fiber orientation optimization. This separated optimization process does not consider material anisotropy during the topology optimization process. The concurrent method has the potential to realize better results by considering the anisotropic properties during topology optimization. However, the concurrent method often obtains locally optimal solutions because of material anisotropy in the initial optimization process. A continuation approach for anisotropy, which starts with weak anisotropy and then improves the anisotropy gradually, resolves this issue. This paper proposes a new concurrent optimization that can control the growth of anisotropy. The growth of anisotropy affects the topology, which is used to determine a better structure. Optimization results were obtained serially by varying the growth of anisotropy, which allowed a highly optimal topology and fiber orientation to be explored by considering their anisotropic nature.
{"title":"Penalized anisotropy: Controlling anisotropy growth in concurrent optimization of topology and fiber orientation for orthotropic composite materials","authors":"Naruki Ichihara, Masahito Ueda, Tomohiro Yokozeki","doi":"10.1177/00219983241230379","DOIUrl":"https://doi.org/10.1177/00219983241230379","url":null,"abstract":"The topology and fiber orientation of fiber-reinforced composite structures must be designed computationally to fully demonstrate their anisotropic mechanical properties. Optimization of the topology and fiber orientation is performed either sequentially or concurrently. In the sequential method, topology optimization is performed first, followed by fiber orientation optimization. This separated optimization process does not consider material anisotropy during the topology optimization process. The concurrent method has the potential to realize better results by considering the anisotropic properties during topology optimization. However, the concurrent method often obtains locally optimal solutions because of material anisotropy in the initial optimization process. A continuation approach for anisotropy, which starts with weak anisotropy and then improves the anisotropy gradually, resolves this issue. This paper proposes a new concurrent optimization that can control the growth of anisotropy. The growth of anisotropy affects the topology, which is used to determine a better structure. Optimization results were obtained serially by varying the growth of anisotropy, which allowed a highly optimal topology and fiber orientation to be explored by considering their anisotropic nature.","PeriodicalId":15489,"journal":{"name":"Journal of Composite Materials","volume":"53 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139951910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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