Composites Part A: Applied Science and Manufacturing最新文献_第10页

Controllable and lightweight ZIF-67@PAN derived Co@C nanocomposites with tunable and broadband microwave absorption 具有可调宽带微波吸收的可控轻质 ZIF-67@PAN 衍生 Co@C 纳米复合材料

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-09-02 DOI: 10.1016/j.compositesa.2024.108445

{"title":"Controllable and lightweight ZIF-67@PAN derived Co@C nanocomposites with tunable and broadband microwave absorption","authors":"","doi":"10.1016/j.compositesa.2024.108445","DOIUrl":"10.1016/j.compositesa.2024.108445","url":null,"abstract":"<div><p>Metal-organic framework-based carbon–carbon composite represent a novel class of microwave-absorbing materials (MAMs). However, obtaining lightweight and highly efficient absorbers with a lower filling ratio and larger effective absorption bandwidth (EAB) poses a challenge. In this study, we developed a controllable preparation method for ZIF-67 template polyacrylonitrile-wrapped nanocomposite (ZIF-67@PAN) precursor. This was achieved through radical polymerization of acrylonitrile (AN) initiated by azobisisobutyronitrile (AIBN). Subsequent annealing at high temperatures produced a lightweight nitrogen and oxygen-doped graphite layer-wrapped Co@C smart material (Co@C<sub>1</sub>, Co@C<sub>2</sub>, and Co@C<sub>3</sub>) with tunable microwave absorption properties (MAP). The results demonstrate that Co@C<sub>2</sub> achieved a minimum reflection loss (RL<sub>min</sub>) value of −50.20 dB at a thickness of 2.0 mm with an EAB of 6.1 only at a filler content of only 13 %. Therefore, this work offers a controllable preparation method and introduces a simple and facile approach for creating efficient, lightweight micro and nano-sized microwave-absorbing materials.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pyrolysis front detection in carbon phenolic composites using x-ray computed tomography 利用 X 射线计算机断层扫描检测碳酚醛复合材料中的热解前沿

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-09-02 DOI: 10.1016/j.compositesa.2024.108444

{"title":"Pyrolysis front detection in carbon phenolic composites using x-ray computed tomography","authors":"","doi":"10.1016/j.compositesa.2024.108444","DOIUrl":"10.1016/j.compositesa.2024.108444","url":null,"abstract":"<div><p>Carbon phenolic composites are used as thermal protection systems (TPS) materials on space capsules to protect them from the hot aerothermal environment. The phenolic resin in the composite material decomposes (pyrolyzes) at low temperatures resulting in a pyrolysis front within the material. The detection of the pyrolysis front after exposure to heat has historically been achieved by physically sectioning cross-sections of the material. We combine the phase contrast retrieval method to reconstruct x-ray computed tomography scans along with image convolution to identify the pyrolysis front in carbon phenolic composites. Unlike the standard filtered back projection method that captures only the carbon phase, the phase contrast retrieval method uses both the attenuation coefficients and refractive indices to illuminate all three phases (carbon, resin, and voids) of carbon phenolic composites. Image convolution is applied on scans reconstructed using the phase contrast retrieval method to develop a density map of the composite to locate the pyrolysis front. The analysis is performed on a sample of phenolic impregnated carbon ablator that was tested in an arc-jet facility. For the sample analyzed, the depth of the pyrolysis front from the surface of the sample is calculated to be 2.150 ± 0.148 mm. Although the proposed approach is applied to detect the pyrolysis front, the tools can be used to illuminate the structure of any carbon phenolic composite, and we propose the use of the phase contrast retrieval method as a methodological standard to analyze carbon phenolic composites used on space capsules.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

4D printing of Nd-Fe-B composites with both shape memory and permanent magnet excitation deformation 具有形状记忆和永磁激励变形的钕铁硼复合材料的 4D 印刷

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-09-01 DOI: 10.1016/j.compositesa.2024.108443

引用次数: 0

Effect of stacking pattern of multilayered polyetheretherketone/boron nitride composites on the mechanical and thermal properties: Experiments and molecular dynamics simulations 多层聚醚醚酮/氮化硼复合材料的堆叠模式对机械和热性能的影响：实验与分子动力学模拟

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-31 DOI: 10.1016/j.compositesa.2024.108441

{"title":"Effect of stacking pattern of multilayered polyetheretherketone/boron nitride composites on the mechanical and thermal properties: Experiments and molecular dynamics simulations","authors":"","doi":"10.1016/j.compositesa.2024.108441","DOIUrl":"10.1016/j.compositesa.2024.108441","url":null,"abstract":"<div><p>The effect of stacking patterns in multilayered polyetheretherketone (PEEK)/boron nitride (BN) composites was investigated to improve the thermal conductivity and mechanical properties. The thick PEEK and BN layers in the multilayered composite were the best multilayer structure, resulting in high mechanical properties and in-plane thermal conductivity due to the many strong electrostatic interaction sites between boron nitride nanosheets (BNNSs). Molecular dynamics simulations were used to clarify the enhanced mechanism of multilayered structure on thermal conductivity. The multilayered structure with combinations of PEEKs and thick BN layers composed of large BNNSs led to the optimization of heat transfer due to the effective phonon transfer path. The best multilayered composite had the highest in-plane thermal conductivity, which was 471% higher than that of a PEEK. This study provides information about the filler size and stacking patterns for more effective multilayer structures with polymer and filler layers to achieve high performance on mechanical and thermal properties.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic carbon nanotube ＋ carbon-coated iron nanoparticle polymer composites: Electrical, magnetic, and mechanical properties 碳纳米管＋碳包覆铁纳米粒子聚合物复合材料的协同作用：电学、磁学和力学性能

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-30 DOI: 10.1016/j.compositesa.2024.108439

{"title":"Synergistic carbon nanotube ＋ carbon-coated iron nanoparticle polymer composites: Electrical, magnetic, and mechanical properties","authors":"","doi":"10.1016/j.compositesa.2024.108439","DOIUrl":"10.1016/j.compositesa.2024.108439","url":null,"abstract":"<div><p>Composite multifunctionality enabled by nanofiller modification has been widely explored in diverse applications. To date, work in this area has focused overwhelmingly on polymers modified with only a single type of nanofiller. Even studies that use more than one type of filler generally do so in order to achieve just a single type of multifunctionality—for example, modification with a combination of carbon nanotubes (CNTs) and graphene for higher electrical conductivity. Much less work has been done in the area of modifying polymers with multiple nanofiller types having dissimilar properties. To that end, we modify a representative polymer (epoxy) with a combination of multi-walled (MW)CNTs and carbon-coated iron nanoparticles (CCFeNPs). These phases give rise to combined electrical and magnetic properties in the MWCNT ＋ CCFeNP composite. DC and AC conductivity, permittivity, permeability, elastic modulus, and piezoresistive gauge factor were measured for varying relative concentrations of MWCNTs and CCFeNPs. Synergistic effects were observed, such as higher electrical conductivity and magnetic permeability in MWCNT ＋ CCFeNP composites. More specifically, composites containing 0.4 wt% MWCNT ＋ 0.1 wt% CCFeNP increased in DC conductivity by 0.5-0.6 S/m compared to 0.5 wt% MWCNT-only specimens. Furthermore, 0.1 wt% MWCNT ＋ 0.4 wt% CCFeNP composites showed a magnetic saturation increase of 1.66 × 10<sup>−4</sup> emu/cm<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> over 0.5 wt% CCFeNP-only composites.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142122251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hierarchical modification of bimodal grain structure in Al/Ti laminated composites for extraordinary strength-ductility synergy 分层修饰铝/钛层压复合材料中的双峰晶粒结构，实现超凡的强度-电导率协同效应

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-30 DOI: 10.1016/j.compositesa.2024.108438

引用次数: 0

Synergy performance of hybrid fiber-reinforced ultra-high-performance cementitious composites with low fiber contents 低纤维含量混合纤维增强超高性能水泥基复合材料的协同性能

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-30 DOI: 10.1016/j.compositesa.2024.108423

{"title":"Synergy performance of hybrid fiber-reinforced ultra-high-performance cementitious composites with low fiber contents","authors":"","doi":"10.1016/j.compositesa.2024.108423","DOIUrl":"10.1016/j.compositesa.2024.108423","url":null,"abstract":"<div><p>This study aims to assess the synergistic tensile performance resulting from the hybridization of long and short fibers. Three types of long steel,fibers, i.e., twisted, hooked, and smooth fibers, along with two types of short fibers, i.e., smooth and polyamide fibers, were incorporated into ultra-high-performance concrete (UHPC) at a total volume content of 1.5%. To predict the tensile resistance of the hybridizations, various machine learning models, including artificial neural network (ANN), decision tree (DT), random forest (RF), and support vector machine (SVM), were applied by utilizing a significant number of collected experimental results. Experimental findings demonstrated that the hybridization of long and short fibers effectively enhanced tensile resistance compared to mono fibers. These hybridizations exhibited negative synergy factors in post-cracking strength but positive synergy factors in both strain capacity and specific work to fracture. Predictions using machine learning models revealed that the RF model exhibited outstanding performance in predicting the tensile resistance of the hybridizations. Furthermore, the compressive strength of the matrix was found to be the most important factor affecting post-cracking strength, whereas fiber length had the most substantial impact on the strain capacity.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142148942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of sandwich test coupons with continuous protective layers for accurate determination of the tensile failure strain of unidirectional carbon fibre reinforced composites 开发带连续保护层的夹层测试券，用于准确测定单向碳纤维增强复合材料的拉伸破坏应变

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-30 DOI: 10.1016/j.compositesa.2024.108440

{"title":"Development of sandwich test coupons with continuous protective layers for accurate determination of the tensile failure strain of unidirectional carbon fibre reinforced composites","authors":"","doi":"10.1016/j.compositesa.2024.108440","DOIUrl":"10.1016/j.compositesa.2024.108440","url":null,"abstract":"<div><p>Recently introduced unidirectional (UD) carbon fibre reinforced epoxy (CF/EP) tensile test coupons with continuous protective layers were developed further by comparing three coupon designs with different layer integration techniques. Consistent experimental data was generated with high sample number and low scatter. Thermal residual strains were considered in case of two coupon designs where the layers were integrated at elevated temperature. A curve-fitting-based strength evaluation method is proposed for the sandwich coupons since this parameter cannot be evaluated directly. The sandwich type coupons yielded statistically significant increase in their average failure strain compared to that of the baseline tabbed coupons. In contrast, the three sandwich coupon types did not show significant differences. Therefore, the sandwich coupon type made by bonding cured UD composite layers together at room temperature is proposed for further application as they allow for full delamination at CF/EP layer fracture and do not require thermal strain correction during the evaluation.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1359835X24004378/pdfft?md5=b3b0c189a2fb8ef2c1f5f4780ff4aefe&pid=1-s2.0-S1359835X24004378-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible sandwich-structured silver nanowire/exfoliated graphite platelet/aramid nanofiber composite films with excellent EMI shielding, thermal conduction and Joule heating performances 具有优异电磁干扰屏蔽、热传导和焦耳热性能的柔性夹层结构银纳米线/片状石墨/芳纶纳米纤维复合薄膜

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-29 DOI: 10.1016/j.compositesa.2024.108433

{"title":"Flexible sandwich-structured silver nanowire/exfoliated graphite platelet/aramid nanofiber composite films with excellent EMI shielding, thermal conduction and Joule heating performances","authors":"","doi":"10.1016/j.compositesa.2024.108433","DOIUrl":"10.1016/j.compositesa.2024.108433","url":null,"abstract":"<div><p>Multifunctional flexible sandwich-structured EMI shielding silver nanowire/exfoliated graphite platelet/aramid nanofiber (AgNW/EGP/ANF) composite films with excellent thermal conduction and Joule heating abilities were successfully prepared by a layer-by-layer vacuum filtration technique. The construction of EGP/ANF layer on the two sides is crucial in achieving outstanding thermal conductivity (TC) and contributes partial EMI shielding effectiveness (SE) for the composite films. The introduction of an ultrathin, dense, and sintered AgNW/ANF layer endows the composite films with significant enhancements in electrical conductivity and EMI SE. As a result, the optimal 30 μm-thick composite films with an AgNW loading of 35 wt% exhibit excellent EMI SE values of 69.0 dB in the X-band and 78.4 dB in the Ka-band and a superior in-plane TC of 48.7 W m<sup>−1</sup> K<sup>−1</sup>. Besides, the prepared composite films present an outstanding Joule heating performance. Briefly, the sandwich-structured composite films show huge potential in advanced portable and wearable electronic applications.</p></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":null,"pages":null},"PeriodicalIF":8.1,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142096939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deep learning-based microstructure analysis of multi-component heterogeneous composites during preparation 基于深度学习的多组分异质复合材料制备过程中的微观结构分析

IF 8.1 2区材料科学

Composites Part A: Applied Science and Manufacturing Pub Date : 2024-08-28 DOI: 10.1016/j.compositesa.2024.108437

引用次数: 0