Pub Date : 2025-03-22DOI: 10.1016/j.compstruct.2025.119107
Jinze Cui , Xiyan Li , Yutai Luo, Simin Zhang, Feng Bao, Jiali Yu, Huichao Liu, Caizhen Zhu, Jian Xu
The primary obstacle to enhancing the mechanical performance of CF/PEEK composites is the insufficient interfacial bonding strength and poor impregnation properties. The present study addresses this issue by focusing on the development of a highly heat-resistant and easily soluble poly (aryl ether ketone) (PFEEK) interfacial binder as well as a processing technology for chopped ultra-thin CF tapes. As a result, the CF/PEEK-2 composites (Mw: 12000 g/mol) exhibited optimal mechanical performance with interlaminar shear strength (ILSS), tensile strength, tensile modulus, tensile toughness, flexural strength, and flexural modulus of 86.0 MPa, 772.9 MPa, 50.2 GPa, 13.5 MJ/m3, 878.5 MPa, and 47.8 GPa, respectively, which can be attributed to the excellent impregnation properties and wettability of the CF bundles and PEEK matrix. Therefore, a heat-resistant (Tg > 250°C; Td5% > 485°C) and diffluent PFEEK binder will provide crucial guidance for further large-scale applications of high-end CF/PEEK composites.
{"title":"Enhanced impregnation behavior and interfacial bonding of CF/PEEK composites by regulating molecular weight of poly (aryl ether ketone) interfacial binder","authors":"Jinze Cui , Xiyan Li , Yutai Luo, Simin Zhang, Feng Bao, Jiali Yu, Huichao Liu, Caizhen Zhu, Jian Xu","doi":"10.1016/j.compstruct.2025.119107","DOIUrl":"10.1016/j.compstruct.2025.119107","url":null,"abstract":"<div><div>The primary obstacle to enhancing the mechanical performance of CF/PEEK composites is the insufficient interfacial bonding strength and poor impregnation properties. The present study addresses this issue by focusing on the development of a highly heat-resistant and easily soluble poly (aryl ether ketone) (PFEEK) interfacial binder as well as a processing technology for chopped ultra-thin CF tapes. As a result, the CF/PEEK-2 composites (<em>Mw</em>: 12000 g/mol) exhibited optimal mechanical performance with interlaminar shear strength (ILSS), tensile strength, tensile modulus, tensile toughness, flexural strength, and flexural modulus of 86.0 MPa, 772.9 MPa, 50.2 GPa, 13.5 MJ/m<sup>3</sup>, 878.5 MPa, and 47.8 GPa, respectively, which can be attributed to the excellent impregnation properties and wettability of the CF bundles and PEEK matrix. Therefore, a heat-resistant (<em>T<sub>g</sub></em> > 250°C; <em>T<sub>d5%</sub></em> > 485°C) and diffluent PFEEK binder will provide crucial guidance for further large-scale applications of high-end CF/PEEK composites.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"362 ","pages":"Article 119107"},"PeriodicalIF":6.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683616","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}
Pub Date : 2025-03-22DOI: 10.1016/j.compstruct.2025.119116
Yunpeng Ye, Xia Zheng, Chengliang Zhou, Xingong Li
Achieving integration of strong electromagnetic wave (EMW) absorption and wide absorption bandwidth through a single-component carbonaceous absorber is still considered a huge challenge due to the impedance mismatch and limited loss mechanisms. Herein, a reed-derived carbon/epoxy (RC/EP) composite absorber with ultra-wide absorption bandwidth and highly strong EMW absorption was fabricated by simultaneous regulation on the micro-structure of RC and establishment of macro-gradient of RC in EP matrix. The compartmentalized structure and gradient distribution of the optimized RC in the EP matrix boosted the reflection and scattering of the EMW, contributing outstanding impedance matching and synergetic EMW dissipation. Therefore, the RC/EP composite with the thickness of 2.0 mm presented a minimum reflection loss (RLmin) of −54.3 dB and an effective absorption bandwidth (EAB) of 6.12 GHz. Varying the content and distribution of RC, the EAB of the RC/EP can cover 99.7 % of the whole Ku band. In addition, the stealth performance of RC/EP absorbing materials under actual far-field conditions is confirmed using Computer Simulation Technology (CST). This work provides a new way to realize a single-component carbonaceous absorber with both broadband and strong EMW absorbing capability, which can satisfy a wide range of applications in the fields of electronics, medical protection, and architectural invisible materials.
由于阻抗失配和有限的损耗机制，通过单组分碳质吸波材料实现强电磁波（EMW）吸收和宽吸收带宽的一体化仍被认为是一个巨大的挑战。在此，通过同时调节 RC 的微观结构和在 EP 基质中建立 RC 的宏观梯度，制备了一种具有超宽吸收带宽和高强电磁波吸收能力的芦苇衍生碳/环氧（RC/EP）复合吸收体。优化的 RC 在 EP 基体中的分区结构和梯度分布增强了对电磁波的反射和散射，有助于实现出色的阻抗匹配和协同电磁波耗散。因此，厚度为 2.0 mm 的 RC/EP 复合材料的最小反射损耗（RLmin）为 -54.3 dB，有效吸收带宽（EAB）为 6.12 GHz。通过改变 RC 的含量和分布，RC/EP 的 EAB 可以覆盖整个 Ku 波段的 99.7%。此外，利用计算机仿真技术（CST）证实了 RC/EP 吸收材料在实际远场条件下的隐身性能。这项工作为实现具有宽带和强电磁波吸收能力的单组分碳质吸收体提供了一条新途径，可满足电子、医疗防护和建筑隐形材料等领域的广泛应用。
{"title":"Macro-Micro structure engineering for reed-derived biochar composites to achieve synergetic dissipation capacities towards wide-band and strong electromagnetic wave absorption","authors":"Yunpeng Ye, Xia Zheng, Chengliang Zhou, Xingong Li","doi":"10.1016/j.compstruct.2025.119116","DOIUrl":"10.1016/j.compstruct.2025.119116","url":null,"abstract":"<div><div>Achieving integration of strong electromagnetic wave (EMW) absorption and wide absorption bandwidth through a single-component carbonaceous absorber is still considered a huge challenge due to the impedance mismatch and limited loss mechanisms. Herein, a reed-derived carbon/epoxy (RC/EP) composite absorber with ultra-wide absorption bandwidth and highly strong EMW absorption was fabricated by simultaneous regulation on the micro-structure of RC and establishment of macro-gradient of RC in EP matrix. The compartmentalized structure and gradient distribution of the optimized RC in the EP matrix boosted the reflection and scattering of the EMW, contributing outstanding impedance matching and synergetic EMW dissipation. Therefore, the RC/EP composite with the thickness of 2.0 mm presented a minimum reflection loss (RL<sub>min</sub>) of −54.3 dB and an effective absorption bandwidth (EAB) of 6.12 GHz. Varying the content and distribution of RC, the EAB of the RC/EP can cover 99.7 % of the whole Ku band. In addition, the stealth performance of RC/EP absorbing materials under actual far-field conditions is confirmed using Computer Simulation Technology (CST). This work provides a new way to realize a single-component carbonaceous absorber with both broadband and strong EMW absorbing capability, which can satisfy a wide range of applications in the fields of electronics, medical protection, and architectural invisible materials.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"363 ","pages":"Article 119116"},"PeriodicalIF":6.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697469","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}
Pub Date : 2025-03-21DOI: 10.1016/j.compstruct.2025.119100
Chang Su, Wei Guan, Hengshan Hu
Porous materials have enormous potential for constructing miniaturized phononic crystals (PCs) for high-frequency sound isolation and noise attenuation applications owing to their unique mechanical properties. This study established a theoretical model of elastic waves in microscale PCs formed by periodic arrangements of fluid-saturated porous materials and investigated the complex band structures of obliquely incident longitudinal waves in a one-dimensional case. The proposed model added the couple-stress theory to the Biot theory to take into account the size effect caused by the solid skeleton’s internal microstructures. The results showed that in the presence of wave-type conversion, there were three types of Bloch waves in the PCs, and an anti-crossing band gap was generated between each of the two waves. The shear-wave velocity and band-gap frequency increased considerably when the size effect was considered. The characteristic length and porosity of the softer material in the composition had the same impact on the band structure, and their increases can lead to a widening in the absolute band gaps. As the thickness difference between the two constituent materials of PCs decreased, the band gaps became increasingly noticeable.
{"title":"Complex band structures of one-dimensional fluid-saturated porous phononic crystals in microscale","authors":"Chang Su, Wei Guan, Hengshan Hu","doi":"10.1016/j.compstruct.2025.119100","DOIUrl":"10.1016/j.compstruct.2025.119100","url":null,"abstract":"<div><div>Porous materials have enormous potential for constructing miniaturized phononic crystals (PCs) for high-frequency sound isolation and noise attenuation applications owing to their unique mechanical properties. This study established a theoretical model of elastic waves in microscale PCs formed by periodic arrangements of fluid-saturated porous materials and investigated the complex band structures of obliquely incident longitudinal waves in a one-dimensional case. The proposed model added the couple-stress theory to the Biot theory to take into account the size effect caused by the solid skeleton’s internal microstructures. The results showed that in the presence of wave-type conversion, there were three types of Bloch waves in the PCs, and an anti-crossing band gap was generated between each of the two waves. The shear-wave velocity and band-gap frequency increased considerably when the size effect was considered. The characteristic length and porosity of the softer material in the composition had the same impact on the band structure, and their increases can lead to a widening in the absolute band gaps. As the thickness difference between the two constituent materials of PCs decreased, the band gaps became increasingly noticeable.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"364 ","pages":"Article 119100"},"PeriodicalIF":6.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785323","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}
Pub Date : 2025-03-21DOI: 10.1016/j.compstruct.2025.119112
Xingya Xiao, Weiwei Qu, Di Yang, Yinglin Ke
With the advent of automated fiber placement (AFP) machines, curvilinear tow paths are more prevalent within complex laying surfaces. However, the tow-steered pattern poses a challenge to the manufacturing process, easily causing manufacturing defects such as fiber wrinkle and gap/overlap. Therefore, it is necessary to analyze and improve the laying feasibility of the designed structure. This work applies the circulation and divergence of the orthogonal vector field to conduct a pre-analysis of the manufacturing performance (path parallelism and steering radius) of the designed fiber directions represented by angle parameterization, and provides a numerical solution for triangle mesh. In addition, path breakpoints associated with triangular gaps are considered as singularities in vector field, and their distribution probability is predicted with vector circulation. The validity of key metrics has been verified through typical ply surfaces. These analytical metrics facilitates a reasonable assessment of the manufacturability of the design site prior to actual placement, reducing manufacturing challenges. Their applications are explored in guidelines selection and breakpoint editing. Finally, an efficient smoothing optimization with complex form is proposed to enhance manufacturability of the design field. The experiments show that these metrics and optimization are suitable for complex open and rotating surfaces.
{"title":"Field-based pre-analysis and optimization for manufacturing feasibility of automated fiber placement path planning","authors":"Xingya Xiao, Weiwei Qu, Di Yang, Yinglin Ke","doi":"10.1016/j.compstruct.2025.119112","DOIUrl":"10.1016/j.compstruct.2025.119112","url":null,"abstract":"<div><div>With the advent of automated fiber placement (AFP) machines, curvilinear tow paths are more prevalent within complex laying surfaces. However, the tow-steered pattern poses a challenge to the manufacturing process, easily causing manufacturing defects such as fiber wrinkle and gap/overlap. Therefore, it is necessary to analyze and improve the laying feasibility of the designed structure. This work applies the circulation and divergence of the orthogonal vector field to conduct a pre-analysis of the manufacturing performance (path parallelism and steering radius) of the designed fiber directions represented by angle parameterization, and provides a numerical solution for triangle mesh. In addition, path breakpoints associated with triangular gaps are considered as singularities in vector field, and their distribution probability is predicted with vector circulation. The validity of key metrics has been verified through typical ply surfaces. These analytical metrics facilitates a reasonable assessment of the manufacturability of the design site prior to actual placement, reducing manufacturing challenges. Their applications are explored in guidelines selection and breakpoint editing. Finally, an efficient smoothing optimization with complex form is proposed to enhance manufacturability of the design field. The experiments show that these metrics and optimization are suitable for complex open and rotating surfaces.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"363 ","pages":"Article 119112"},"PeriodicalIF":6.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738007","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}
Pub Date : 2025-03-21DOI: 10.1016/j.compstruct.2025.119106
Jiahui Yan , Yingli Li , Guohui Yin , Gengwang Yan , Heow Pueh Lee
Recent advances in multifunctional acoustic metamaterials have highlighted the need for broadband sound absorption with ventilation functionality. This study introduces a Multi-order Coiled-up Channels lined with Porous Material (MCCPM) design, which integrates multi-order cavity resonances with viscous-thermal dissipation of porous materials to enhance absorption efficiency across a wide frequency range while enabling air ventilation. MCCPM system demonstrates robust absorption efficiency across variations in porous material type, incident angle, temperature and ventilation area ratio. To optimize the design process, an inverse design method is introduced, employing a Genetic Algorithm (GA)-controlled Deep Neural Network (DNN) model, which achieves a 4000-fold improvement in computational efficiency compared to traditional finite element method (FEM). By specifying the desired absorption frequency range and physical constraints, the hybrid DNN-GA approach generates weighted-optimized MCCPM structures that achieve impressive performance metrics: average sound absorption coefficients of 0.76, 0.81, and 0.77, with corresponding half-absorption bandwidth ratios of 79.5 %, 100 %, and 89.3 % across customized frequency ranges of 200–600 Hz, 600–1000 Hz, and 300–1000 Hz, respectively. This deep learning-based inverse design approach paving the way for breakthroughs in multifunctional metamaterials research, offering new avenues for applications in noise control, ventilation systems, and sustainable building technologies.
{"title":"Inverse-designed multifunctional metamaterials for broadband acoustic absorption and ventilation","authors":"Jiahui Yan , Yingli Li , Guohui Yin , Gengwang Yan , Heow Pueh Lee","doi":"10.1016/j.compstruct.2025.119106","DOIUrl":"10.1016/j.compstruct.2025.119106","url":null,"abstract":"<div><div>Recent advances in multifunctional acoustic metamaterials have highlighted the need for broadband sound absorption with ventilation functionality. This study introduces a Multi-order Coiled-up Channels lined with Porous Material (MCCPM) design, which integrates multi-order cavity resonances with viscous-thermal dissipation of porous materials to enhance absorption efficiency across a wide frequency range while enabling air ventilation. MCCPM system demonstrates robust absorption efficiency across variations in porous material type, incident angle, temperature and ventilation area ratio. To optimize the design process, an inverse design method is introduced, employing a Genetic Algorithm (GA)-controlled Deep Neural Network (DNN) model, which achieves a 4000-fold improvement in computational efficiency compared to traditional finite element method (FEM). By specifying the desired absorption frequency range and physical constraints, the hybrid DNN-GA approach generates weighted-optimized MCCPM structures that achieve impressive performance metrics: average sound absorption coefficients of 0.76, 0.81, and 0.77, with corresponding half-absorption bandwidth ratios of 79.5 %, 100 %, and 89.3 % across customized frequency ranges of 200–600 Hz, 600–1000 Hz, and 300–1000 Hz, respectively. This deep learning-based inverse design approach paving the way for breakthroughs in multifunctional metamaterials research, offering new avenues for applications in noise control, ventilation systems, and sustainable building technologies.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"362 ","pages":"Article 119106"},"PeriodicalIF":6.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683532","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}
Pub Date : 2025-03-21DOI: 10.1016/j.compstruct.2025.119103
Ming-Cian Syu, Tungyang Chen
We present an exact analysis of tunable thermal metamaterials made of composite cylinder or sphere with imperfect interface effects. The composite cylinder or sphere is composed of an isotropic core coated with a layer of curvilinearly anisotropic material. The interface between the core and the anisotropic layer could be imperfectly bonded, either with low-conductivity or high-conductivity type of interface. Based on an effective medium theory of neutral inclusion, we show that it is possible to balance in different ways among the material and geometric parameters, together with bonding parameters, so that the composite cylinder or sphere is thermally transparent to the background medium. We show how these parameters will affect the thermal intensity within our targeted region, either greatly enhanced or shielded. Remarkably, we show that there exists an interesting link between the core conductivity and the imperfect interface parameter for either type of imperfect interface, highlighting how the effect of core conductivity can be correlated exactly to the effect of bonding imperfectness. We also validate our analytic results with numerical simulations based on finite element calculations. Our findings provide insightful guidance towards the understanding of thermal transport mechanism across imperfect interfaces in thermal metamaterials.
{"title":"Thermal transparency of tunable thermal metamaterials composed of composite cylinder or sphere with imperfect interface","authors":"Ming-Cian Syu, Tungyang Chen","doi":"10.1016/j.compstruct.2025.119103","DOIUrl":"10.1016/j.compstruct.2025.119103","url":null,"abstract":"<div><div>We present an exact analysis of tunable thermal metamaterials made of composite cylinder or sphere with imperfect interface effects. The composite cylinder or sphere is composed of an isotropic core coated with a layer of curvilinearly anisotropic material. The interface between the core and the anisotropic layer could be imperfectly bonded, either with low-conductivity or high-conductivity type of interface. Based on an effective medium theory of neutral inclusion, we show that it is possible to balance in different ways among the material and geometric parameters, together with bonding parameters, so that the composite cylinder or sphere is thermally transparent to the background medium. We show how these parameters will affect the thermal intensity within our targeted region, either greatly enhanced or shielded. Remarkably, we show that there exists an interesting link between the core conductivity and the imperfect interface parameter for either type of imperfect interface, highlighting how the effect of core conductivity can be correlated exactly to the effect of bonding imperfectness. We also validate our analytic results with numerical simulations based on finite element calculations. Our findings provide insightful guidance towards the understanding of thermal transport mechanism across imperfect interfaces in thermal metamaterials.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"363 ","pages":"Article 119103"},"PeriodicalIF":6.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714339","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}
Pub Date : 2025-03-21DOI: 10.1016/j.compstruct.2025.119104
Muhammad Hanif , Li Zhang , Abdul Hakim Shah , Zhangwei Chen
Electrically conductive polymer composites have emerged as a pivotal material in polymer science, offering enhanced properties by integrating conductive nanofillers with pure polymers. The material extrusion-based (MEX) 3D printing of these composites is well-known for yielding high-quality parts. In this study, a novel approach involving a modified four-extrusion strategy was utilized to synthesize a reinforced conductive poly(lactic) acid polymer composite with reduced graphene oxide (RGO) and short glass fibers (SGFs). This work comprehensively studies the thermal degradation, thermodynamic, morphological, and electrical properties, alongside with a focus on optimizing the MEX 3D printing process for enhanced performance. Optimal printing parameters significantly influencing the surface roughness and tensile properties of the printed parts were found, including a layer thickness of 0.10 mm, a nozzle temperature of 205 °C, a flat print orientation, an infill speed of 72.55 mm/s, and an infill density of 99.9 %. The minimum surface roughness was achieved for the PLA composites is 3.67 µm (14.6 %) lower than the pure PLA. The incorporation of nanofillers will improve the layer deposition and accumulation of materials. The incorporation of reinforcements into the composite material resulted in substantial improvements in the overall performance, with tensile strength, yield strength, breaking strength, and elastic modulus being increased by 85.4 %, 58.4 %, 101 %, and 128 %, respectively. The composites developed in this research exhibit promising potential for applications within the electrical and electronics industries, showcasing their versatility and performance advantages in advanced material science.
{"title":"Material extrusion 3D printing of synergistically enhanced conductive poly(lactic) acid polymer composites with reduced graphene oxide and glass fibers for high-performance electronic applications","authors":"Muhammad Hanif , Li Zhang , Abdul Hakim Shah , Zhangwei Chen","doi":"10.1016/j.compstruct.2025.119104","DOIUrl":"10.1016/j.compstruct.2025.119104","url":null,"abstract":"<div><div>Electrically conductive polymer composites have emerged as a pivotal material in polymer science, offering enhanced properties by integrating conductive nanofillers with pure polymers. The material extrusion-based (MEX) 3D printing of these composites is well-known for yielding high-quality parts. In this study, a novel approach involving a modified four-extrusion strategy was utilized to synthesize a reinforced conductive poly(lactic) acid polymer composite with reduced graphene oxide (RGO) and short glass fibers (SGFs). This work comprehensively studies the thermal degradation, thermodynamic, morphological, and electrical properties, alongside with a focus on optimizing the MEX 3D printing process for enhanced performance. Optimal printing parameters significantly influencing the surface roughness and tensile properties of the printed parts were found, including a layer thickness of 0.10 mm, a nozzle temperature of 205 °C, a flat print orientation, an infill speed of 72.55 mm/s, and an infill density of 99.9 %. The minimum surface roughness was achieved for the PLA composites is 3.67 <!--> <!-->µm (14.6 %) lower than the pure PLA. The incorporation of nanofillers will improve the layer deposition and accumulation of materials. The incorporation of reinforcements into the composite material resulted in substantial improvements in the overall performance, with tensile strength, yield strength, breaking strength, and elastic modulus being increased by 85.4 %, 58.4 %, 101 %, and 128 %, respectively. The composites developed in this research exhibit promising potential for applications within the electrical and electronics industries, showcasing their versatility and performance advantages in advanced material science.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"362 ","pages":"Article 119104"},"PeriodicalIF":6.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683534","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}
Pub Date : 2025-03-21DOI: 10.1016/j.compstruct.2025.119109
T. Wang , O. Menshykov , M. Menshykova
This study introduces the innovative two-level semi-analytical solution to predict failure in thick-walled composite pipes under complex loading conditions, including combined axial, pressure, torsion, and bending loads. Rooted in 3D elasticity theory, the model uses a stress superposition method to calculate stresses in composite pipes under combined symmetric and asymmetric loads, demonstrating appropriate agreement with FE models developed for validation.
A comprehensive parametric study examines the influence of winding angle, stacking sequence, and load magnitude on failure behaviour, utilizing three distinct failure criteria. The results unveil significant coupling effects between design parameters and loading conditions, providing crucial insights into failure modes and their locations. The developed analytical model and maximum load diagram serve as powerful and efficient tools for engineers, enabling sophisticated failure analysis and optimal design under complex loading conditions. In particular, it was found that combinations of low and medium winding angles offer superior anti-failure performance.
{"title":"Composite pipes failure under combined axisymmetric and asymmetric loading: Semi-analytical solution and stress superposition","authors":"T. Wang , O. Menshykov , M. Menshykova","doi":"10.1016/j.compstruct.2025.119109","DOIUrl":"10.1016/j.compstruct.2025.119109","url":null,"abstract":"<div><div>This study introduces the innovative two-level semi-analytical solution to predict failure in thick-walled composite pipes under complex loading conditions, including combined axial, pressure, torsion, and bending loads. Rooted in 3D elasticity theory, the model uses a stress superposition method to calculate stresses in composite pipes under combined symmetric and asymmetric loads, demonstrating appropriate agreement with FE models developed for validation.</div><div>A comprehensive parametric study examines the influence of winding angle, stacking sequence, and load magnitude on failure behaviour, utilizing three distinct failure criteria. The results unveil significant coupling effects between design parameters and loading conditions, providing crucial insights into failure modes and their locations. The developed analytical model and maximum load diagram serve as powerful and efficient tools for engineers, enabling sophisticated failure analysis and optimal design under complex loading conditions. In particular, it was found that combinations of low and medium winding angles offer superior anti-failure performance.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"363 ","pages":"Article 119109"},"PeriodicalIF":6.3,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704943","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}
Pub Date : 2025-03-20DOI: 10.1016/j.compstruct.2025.119095
Haoyu Wang , Ning Guo , Zexing Yu , Dongwu Li , Chao Xu
Bistable composite column-shell structures are extensively employed in aerospace deployable systems, with curling being the primary method for storage and deployment. To streamline the FE (FE) modeling of the curling process and investigate the strength characteristics, this paper proposed a simplified finite element method (FEM) for bistable composite column-shell structures based on a reverse modeling approach. Firstly, based on the theory of the ploy region of the bistable column-shell structures, a reverse modeling method is proposed, which is capable of obtaining the geometrical configurations of the bistable column-shells under the fixed boundary conditions at one end. The accuracy of the reverse modeling result is verified by using the experimental method and the FEM. Then, based on the reverse modeling approach, a simplified FEM is developed, with both experimental and simulation results confirming its comparable accuracy to the traditional FEM. Finally, using this simplified FEM, the effects of ply angle and single-layer thickness on the structural strength during the curling process are analyzed, and guidelines for selecting optimal design parameters are provided.
{"title":"Simplified FE modeling of bistable column-shell structures and strength analysis during the curling process","authors":"Haoyu Wang , Ning Guo , Zexing Yu , Dongwu Li , Chao Xu","doi":"10.1016/j.compstruct.2025.119095","DOIUrl":"10.1016/j.compstruct.2025.119095","url":null,"abstract":"<div><div>Bistable composite column-shell structures are extensively employed in aerospace deployable systems, with curling being the primary method for storage and deployment. To streamline the FE (FE) modeling of the curling process and investigate the strength characteristics, this paper proposed a simplified finite element method (FEM) for bistable composite column-shell structures based on a reverse modeling approach. Firstly, based on the theory of the ploy region of the bistable column-shell structures, a reverse modeling method is proposed, which is capable of obtaining the geometrical configurations of the bistable column-shells under the fixed boundary conditions at one end. The accuracy of the reverse modeling result is verified by using the experimental method and the FEM. Then, based on the reverse modeling approach, a simplified FEM is developed, with both experimental and simulation results confirming its comparable accuracy to the traditional FEM. Finally, using this simplified FEM, the effects of ply angle and single-layer thickness on the structural strength during the curling process are analyzed, and guidelines for selecting optimal design parameters are provided.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"362 ","pages":"Article 119095"},"PeriodicalIF":6.3,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697095","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}
Pub Date : 2025-03-20DOI: 10.1016/j.compstruct.2025.119115
Qi Liu , Jin-Shui Yang , Yuan-Yuan Tang , Yao-Yao Xu , Hao Han , Yong-Le Fan , Shuang Li , Lin-Zhi Wu
To achieve low-frequency broadband sound absorption and enhanced mechanical strength, this study proposes a novel carbon fiber composite corrugated resonator metamaterial (CCRM). The CCRM is designed based on principle of the Helmholtz Resonator (HR) and fabricated by using computer numerical control (CNC) cutting technology. The sound absorption coefficient reaches up to 0.9 in the frequency range of 500–1000 Hz. The absorbed wavelength is 13 times the thickness of the structure. Experimental, theoretical, and numerical analyses confirm that the broadband absorption is due to the parallel coupling of the resonators. Additionally, uniaxial compression tests demonstrate the CCRM’s superior specific stiffness, specific strength, and sound absorption-to-thickness ratio, which is highlighting the mechanical robustness. By revealing the dependences of sound absorption performance on the geometric parameters and arrangement of the HR structures, this study provides a foundational exploration for the development of new multifunctional acoustic metamaterials. The optimized design of CCRM shows great potential for applications in complex engineering environments such as aerospace, railways, and automotive industries.
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