Composite Structures最新文献

{"title":"Investigation on the recycling potential of additively manufactured carbon fiber reinforced PA 6.6","authors":"C. Lohr ,&nbsp;A. Trauth ,&nbsp;J. Schukraft ,&nbsp;S. Leher ,&nbsp;K.A. Weidenmann","doi":"10.1016/j.compstruct.2024.118683","DOIUrl":"10.1016/j.compstruct.2024.118683","url":null,"abstract":"<div><div>Carbon fiber reinforced polymers (CFRP) are already used in a wide range of applications such as automotive, aerospace and renewable energy industries and demand on this material class is increasing steadily. As demand increases, the amount of CFRP waste, either from production or at the end of life of components, increases simultaneously and sustainable solutions such as disposal, reuse or recycling of fiber reinforced materials getting more and more important.</div><div>In this paper one possibility for recycling short carbon fiber reinforced polyamide 6.6 (CF/PA 6.6) is presented. The recycling process includes shredding of the material, drying and filament extrusion to enable a reuse of the material with an additive manufacturing process. The focus of this investigation is on the mechanical properties of the recycled filaments itself as well as on the 3D printed specimen considered recycled filaments. The properties at different stages of the short carbon fiber reinforced polyamide 6.6 recycling process were investigated, including the juvenile CF/PA 6.6 as well as specimens made from one- or two-times recycled material. Mechanical performance was evaluated by tensile, bending and impact testing. Experimental results pointed out that no significant difference in performance of juvenile and recycled materials was observed for tensile and flexural loads. The impact strength of the recycled specimen decreased to a small extent.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118683"},"PeriodicalIF":6.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663532","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}

{"title":"Experimental and numerical investigations of interlaminar shear behaviors of CFRP composites at cryogenic and high temperatures","authors":"W.J. Huang ,&nbsp;Y.T. Li ,&nbsp;Y.M. Zhang ,&nbsp;Z.M. Xiao ,&nbsp;W.G. Li","doi":"10.1016/j.compstruct.2024.118681","DOIUrl":"10.1016/j.compstruct.2024.118681","url":null,"abstract":"<div><div>The interlaminar shear strength and failure modes of carbon fiber reinforced polymer composites at different temperatures ranged from 90 K to 353 K were thoroughly investigated by the short beam shear tests. Considering the three different lay-up configurations, i.e., unidirectional, cross-ply and angle-ply, the results showed that the interlaminar shear strength of the unidirectional laminates increased by 67.5 % with the decrease of temperature from room temperature down to 90 K, while they were insignificantly affected by cryogenic temperature for both the cross-ply and angle-ply laminates. A numerical model of short beam shear behavior was developed to calculate the interlaminar shear strength, and the results were found to be in a good agreement with the experimental data. Furthermore, the observations of fracture surfaces using a scanning electron microscope provided the insights into the failure modes of the laminates at the microscopic scale. At 90 K the delamination in the unidirectional laminates was obvious, extending toward to the edge of the specimen. In the cross-ply laminates, a few large penetrating cracks appeared in the mid-plane, several small matrix cracks and voids were obvious in the fracture surface of the specimen. Additionally, the multiple cracks formed by the delamination were observed in the angle-ply laminates.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118681"},"PeriodicalIF":6.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663464","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}

{"title":"Mechanical properties of diamond-type triply periodic minimal surface structures fabricated by photo-curing 3D printing","authors":"Chengjun Zeng ,&nbsp;Junqi Hu ,&nbsp;Liwu Liu ,&nbsp;Wei Zhao ,&nbsp;Xiaozhou Xin ,&nbsp;Xuehao Song ,&nbsp;Yanju Liu ,&nbsp;Jinsong Leng","doi":"10.1016/j.compstruct.2024.118695","DOIUrl":"10.1016/j.compstruct.2024.118695","url":null,"abstract":"<div><div>Triply periodic minimal surface (TPMS) structures have attracted significant attention owing to their smooth surface configuration and parametric modeling properties. In this study, photo-curing 3D printing was employed to generate diamond-type TPMS structures, and micro-CT scanning revealed the presence of internal defects within the 3D printed TPMS structures. Two key design variables were explored: volume fraction and unit cell size. Quasi-static compression experiments were conducted to delve into the compression properties and energy absorption capabilities of the 3D printed TPMS structures. The findings reveal that increasing the volume fraction significantly enhances the compressive modulus, ultimate strength, and energy absorption capacity of TPMS structures. Additionally, increasing the cell size improves compression properties and energy absorption per unit volume. To predict the coupling effect of volume fraction and unit cell size on the compression performance of TPMS structures, a bivariate quadratic regression model was established. In addition, TPMS structures were subjected to load-unload cyclic experiments, shedding light on the evolution patterns of residual strain and hysteresis energy during cyclic loading. It provides insights into the design of reusable and fatigue-resistant diamond-type TPMS structures for various engineering applications.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118695"},"PeriodicalIF":6.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663460","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}

{"title":"Tomographic modeling and internal structure analysis of engineering textiles: A parametric approach","authors":"Bin Yang ,&nbsp;Cédric Béguin ,&nbsp;Philippe Causse ,&nbsp;Yuwei Feng ,&nbsp;Jihui Wang","doi":"10.1016/j.compstruct.2024.118679","DOIUrl":"10.1016/j.compstruct.2024.118679","url":null,"abstract":"<div><div>Tomographic modeling of textiles is attractive for numerical investigation of composites due to its ability to reveal the internal architecture. However, reliability is notably dependent on geometrical modeling accuracy, which is still challenging. This paper addresses existing issues using a parametric approach that relies on statistical resampling and spatial autocorrelated prediction. The proposed strategy involves three stages: first, an explicit representation of each fiber tow is derived from the segmented images through statistical resampling in the parametric domain, which is subsequently mapped back to the physical domain according to known spatial autocorrelation. It allows depicting tow surfaces with varying levels of detail. Second, the tow trajectory is parameterized and subjected to a smoothing process, thereby identifying the local fiber orientation as its tangent vector. Finally, the normal cross-sections of tows are solved as intersecting implicit planes with a parametric tubular surface thanks to the parametric representation. This allows evaluating the spatial architectural variability in tows with notable waviness. Examinations were performed by contrasting the proposed approach with existing techniques. This new approach demonstrated better consistency with the ground truth while bringing additional benefits to the geometry reconstruction.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118679"},"PeriodicalIF":6.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663461","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}

{"title":"The role of impact energy and silica concentration on dynamic impact and quasi-static puncture resistance of fabrics treated with shear-thickening fluids","authors":"Abdulhalim Aşkan ,&nbsp;Murat Aydın","doi":"10.1016/j.compstruct.2024.118689","DOIUrl":"10.1016/j.compstruct.2024.118689","url":null,"abstract":"<div><div>The primary objective of this study is to reveal the role of shear-thickening fluids on the low-speed impact behavior and quasi-static puncture resistance conditions of impregnated p-aramid fabric. This was achieved by progressively increasing the silica ratio methodically. Rheological experiments indicated that 60% represents a crucial threshold for silica content, over which the rheological performance of fluids markedly improves. The impregnated targets exhibited a substantial increase in both dynamic impact and quasi-static puncture resistance in comparison to the neat fabric. Results from tests using the same amount of impact energy showed that impregnated targets had much better impact resistance (ranging from 30.5% to 119.2%) and better energy absorption (ranging from 22.9% to 61.3%) than the untreated targets. In quasi-static tests, impregnated targets exhibited significantly higher puncture resistance, ranging from 42.3% to 90.46%, compared to the neat fabric. The enhanced performance of impregnated targets was ascribed to the presence of interfiber friction, the thickening mechanism of the fluid, and the hardness of the particles. Compared to the neat fabric, the performance enhancement achieved in dynamic impact tests is greater than that observed in quasistatic tests. The variation in performance was associated with the contact area of the threat with the target. Due to the intense force exerted by the knife tip, its contact area with the target is smaller in comparison to that of the impactor. This caused the particle hardness and thickening mechanism to play a lesser role in quasi-static tests compared to impact tests. In addition, to reveal the effect of impact energy, tests were carried out at three different impact energy levels: 20J, 40J, and 60J. The impact resistance of both neat and impregnated textiles improved as the impact energy went up. Nevertheless, the neat fabric exhibited a greater augmentation in resistance in contrast to the impregnated one.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118689"},"PeriodicalIF":6.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663531","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}

{"title":"Reliability-based multi-objective optimization design of composite patch repair structure using artificial neural networks","authors":"Yubo Zhao ,&nbsp;Shanyong Xuan ,&nbsp;Yuan Wang ,&nbsp;Yongbin Li ,&nbsp;Xuefeng Yao","doi":"10.1016/j.compstruct.2024.118692","DOIUrl":"10.1016/j.compstruct.2024.118692","url":null,"abstract":"<div><div>Due to the parameter differences and the existence of random factors, the performance of composite repair structure shows a large dispersion. In order to obtain stronger, lighter and more reliable repair structure, multi-objective optimization design of carbon fiber reinforced polymers (CFRP) laminate repair structure is investigated by combining the reliability theory, artificial neural networks and the genetic algorithm. First, a 3D simulation model of the composite laminate patch repair structures is established using the 3D Hashin criterion and the cohesive region model. Then, the Latin Hypercube sampling (LHS) method is used to realize the random sampling, and the strength proxy model of the repair structure is established by using Back-propagation artificial neural network, further a multi-objective optimization model with tensile strength, reliability and weight as objective functions is built considering the design parameters and the random parameters. Finally, NSGAⅡalgorithm is used to solve the multi-objective optimization problem, and a set of solutions on the Pareto front surface are obtained, also the optimal design parameters of the composite repair structure meets the requirements is obtained.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118692"},"PeriodicalIF":6.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663535","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}

{"title":"A multi-linear constitutive relation considering the temperature effect on quasi-static mode I delamination in UD/MD laminates","authors":"Luohuan Zou ,&nbsp;Yu Gong ,&nbsp;Dingli Tian ,&nbsp;Yuting Gao ,&nbsp;Jianyu Zhang ,&nbsp;Libin Zhao ,&nbsp;Ning Hu","doi":"10.1016/j.compstruct.2024.118691","DOIUrl":"10.1016/j.compstruct.2024.118691","url":null,"abstract":"<div><div>In this study, a multi-linear constitutive relation taking into account temperature and fiber bridging is proposed for characterizing delamination behavior in composite laminates under various temperature conditions. An approach combining analytical solution and <em>J</em>-integral is also established for determining the cohesive parameters in the multi-linear constitutive relation. To validate the proposed constitutive relation, mode I quasi-static delamination experiments of unidirectional (UD) and multidirectional (MD) carbon/bismaleimide laminates are carried out at 25 ℃ (room temperature), 80 °C and 130 ℃. The experimental results show that the increasing temperature resulted in a monotonic increase in the fracture toughness of the UD laminates while affect the fracture toughness of MD laminates slightly. A FE model is established with the implementation of the proposed multi-linear constitutive relation using UMAT subroutine. Good agreements between the experimental and simulated results demonstrate the validity of the proposed constitutive relation, with the relative difference of peak load between predicted and experimental values less than 8.2 % and the relative difference of initial and steady-state fracture toughness between predicted and tested results less than 15 %. This study provides the possibility to numerically study the temperature effect on the delamination behavior of laminates and has promising applications in the damage tolerance design of composite structures.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118691"},"PeriodicalIF":6.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663533","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}

{"title":"Hybrid composite-metal structure response to post-impact compression – Experimental and numerical study","authors":"Piotr Podolak,&nbsp;Patryk Jakubczak,&nbsp;Jarosław Bieniaś","doi":"10.1016/j.compstruct.2024.118685","DOIUrl":"10.1016/j.compstruct.2024.118685","url":null,"abstract":"<div><div>Numerical analysis of the post-impact damage propagation process during CAI tests on titanium-based fibre metal laminates was conducted, and the model was validated by collation of mechanical parameters predicted by it with experimental results. Delaminations induced by the impact were claimed as the hotspot for other modes propagation in most of studied cases and intensively propagated shortly before reaching peak compressive force. Metal – composite interfaces away from impact surface were locations of most intensive delamination propagation during CAI, constituting 63.5 % of overall damage area for titanium-carbon laminate and 81.6 % for titanium-glass laminate. Similarly to delaminations, damage due to fibre and matrix compression propagated from impact point and lead to significant load-carrying ability loss even in low volumes. Propagation of fibre and matrix tension was connected more to buckling progression, than post-impact damage and had the highest volumetric share in composite layers damage modes (max 13.5 % for titanium-carbon laminate and 8.3 % for titanium-glass laminate).</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118685"},"PeriodicalIF":6.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592590","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}

{"title":"A rotating triangular auxetic perforated plate: Structural design and characteristic analysis","authors":"Tao Xue,&nbsp;Wei Zhong Jiang,&nbsp;Yi Zhang,&nbsp;Nian Ci Du,&nbsp;Jun Wen Shi,&nbsp;Yi Chao Qu,&nbsp;Xin Ren","doi":"10.1016/j.compstruct.2024.118684","DOIUrl":"10.1016/j.compstruct.2024.118684","url":null,"abstract":"<div><div>Auxetic metamaterials have garnered extensive attention over the past few decades due to their exceptional and superior mechanical properties. However, owing to their unique porous structure, it is challenging to ensure that structures possess strong energy absorption capabilities while exhibiting excellent auxetic characteristics. This study introduces a rotating triangular auxetic metamaterial (RTAM) by perforating traditional rigid rotating triangles. Quasi-static compression tests and numerical simulations are conducted on the new structure to investigate the effects of wall thickness and re-entrant angle of the triangular perforated plate on mechanical properties and Poisson’s ratio. The plateau stress and specific energy absorption (SEA) of RTAM are 4 and 10 times higher than that of traditional trichiral auxetic metamaterials (TCAM), respectively. With an increase in wall thickness, both plateau stress and SEA of the structure are improved significantly. As the re-entrant angle increases, the SEA of the structure initially decreases and then increases. RTAM achieves both lightweight structure and ideal mechanical performance, providing an approach for manufacturing lightweight and high-strength auxetic metamaterials, with significant potential applications in the field of energy absorption.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118684"},"PeriodicalIF":6.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663529","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}

{"title":"Extension of the crack equivalent method applied to mode II fracture of thermoplastic composites bonded joints using the ENF test","authors":"J.P. Reis ,&nbsp;M.F.S.F. de Moura ,&nbsp;R.D.F. Moreira","doi":"10.1016/j.compstruct.2024.118687","DOIUrl":"10.1016/j.compstruct.2024.118687","url":null,"abstract":"<div><div>Thermoplastic based composites (TPC) have emerged as a new generation of eco-friendly materials with tougher matrices capable of overcoming the major weaknesses of the thermoset counterparts related with poor resistance to delamination and recycling difficulties. Although TPC materials present low surface energy, adhesive bonding is still effective when the requirements for fusion bonding procedures are not met. Recent advances in adhesive technology have unveiled two-part acrylic adhesive specifically designed for low energy surfaces, characteristic of TPC materials. In this work, unidirectional carbon-reinforced polyamide 6 (CF/PA6) bonded joint was characterized under pure mode II loading using end-notched flexure (ENF) test. The experimental fracture tests revealed unstable crack propagation and a data reduction scheme based on the equivalent crack concept was developed to obtain the strain energy release rate distribution along the crack front for the specimen’s length beyond the actuator central loading point. The proposed procedure was successfully validated using a finite element analysis including a cohesive zone modelling and applied to the experimental results. The obtained <em>Resistance</em>-curves showed that this adhesive is capable to provide a significant bonding resistance in pure mode II loading even in low energy surfaces characteristic of TPC materials.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"352 ","pages":"Article 118687"},"PeriodicalIF":6.3,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592591","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}