关键词： 生物活性材料   骨感染   抗菌   骨再生   骨组织工程   复合材料   可视化分析  

摘要： 背景:随着对生物活性材料的深入研究,各类生物活性材料已成为抗骨感染的重要研究手段与治疗方法。目的:通过对生物活性材料治疗骨感染的相关文献进行可视化分析,探明该领域的研究现状。方法:以中国知网与Web of Science核心合集数据库为检索平台,检索生物活性材料治疗骨感染的相关文献,筛选后导入CiteSpace软件,对发文量、研究机构、作者、文献共被引、关键词等进行可视化分析。结果与结论:(1)根据文献检索及筛选得出中国知网共计纳入相关文献149篇,Web of Science核心合集数据库纳入相关文献1031篇,其中中国发文量最大,美国发文量中心性最高。(2)Web of Science核心合集数据库中发文前3的机构为上海交通大学、四川大学、中国科学院,中国知网发文前3的机构为第三军医大学、昆明医科大学、南方医科大学,其中SHUAI CJ及BOCCACCINI AR两位教授发文最多,HENCH LL教授被引用最高,《Biomaterials》杂志被引用最多。(3)Web of Science核心合集数据库中关键词出现频率最高的前3位为scaffolds、in vitro、bone,中国知网中关键词出现频率最高的前3位为骨髓炎、骨缺损、骨感染,结合关键词及文献共被引分析发现,该领域的研究热点为生物材料与抗菌性能、复合材料与多功能设计以及组织工程与骨再生3个方面。

关键词： Composites   Load transfer   Nacre   Bioinspired   Architected materials  

摘要： Nacre exhibits excellent mechanical properties attributed to the staggered alignment of inorganic minerals and bio-organic materials. This study aims to understand how stress transfers from macro-scale loading conditions to the staggered architecture, revealing multiple stress transfer modes in nacre-like composites under off-axis tensile loading conditions. We propose an innovative off-axis tension-shear chain model, which predicts the trend of the equivalent modulus. Systematic optimization reveals a counter-intuitive result: the equivalent modulus at a certain angle can be smaller than the equivalent moduli in both principal directions, and this phenomenon differs from the monotonic behavior commonly observed in continuous fiber composite materials. © The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Discontinuous curved fiber reinforced composites (DCFRCs)   Representative volume element (RVE)   Modified RSA algorithm   Modified rule-of-mixture   Elastic properties   Fiber waviness  

摘要： The present study proposes a modified random sequential absorption (RSA) algorithm to generate a representative volume element (RVE) model for predicting the elastic properties of discontinuous curved fiber reinforced composites (DCFRCs) with varying fiber waviness functions and orientations. A small-move method was proposed to modify the traditional RSA algorithm. In comparison with the original RSA algorithm, the generation efficiency of the proposed modified RSA algorithm increased by over 40%, and the achievable maximum fiber volume fraction could reach up to 15% with a fiber aspect ratio of 15. The generated RVE model was utilized in conducting finite element analysis to investigate the effect of fiber waviness and wavy functions on the elastic properties of DCFRCs. Finally, a modified rule-of-mixture was proposed to predict the elastic properties of DCFRCs with various fiber orientations. The results indicated that the elastic properties predicted by the modified rule-of-mixture were in good agreement with those obtained from the RVE model, thereby demonstrating its effectiveness.

关键词： 钢结构   约束支撑   抗震设计   新型复合材料   桥梁结构设计  

摘要： 为了提高土木工程桥梁结构的承载能力、耐久性和抗震性能,本文以某市跨江大桥为例,通过对新型符合材料性能和应用场景的介绍,分析了新型符合材料在土木工程桥梁设计中的关键技术和应用方案,提出了基于新型符合材料的土木工程桥梁结构设计改进方案,研究结果表明,经过改进后的设计方案,土木工程桥梁的承载能力、耐久性和抗震性能都有所增强。因此,该改进方案为土木工程桥结构的设计提供了新的设计思路。

关键词： High-G droplets   Composite substrate   Wetting profile   Hypergravity condition   Scaling law   Energy distribution  

摘要： The wetting phenomenon of composite substrates in hypergravitational environment has a huge application in electronic devices and astronaut healthcare in aerospace missions. In the present contribution, the governing equation of high-G droplets on the composite substrate is firstly established in the hypergravitational environment. Meanwhile, the apparent contact angles at the contact line between droplets and substrates with different stiffness gradients are achieved. Then, we analyze the effects of hypergravity factor and the substrate stiffness on the wetting profile of high-G droplets. By introducing the droplet volume and contact angle into the Bond number, the scaling law of the high-G droplet profile is established, and we find that the contact radius of the droplet R/S-0.5 has a linear relationship with rho omega(2)rl(2)S/(gamma(LV)theta), while the droplet height H/S-0.5 has a power-law relationship with rho omega(2)rl(2)S / (gamma(LV)theta). Finally, we explain the profiles of high-G droplets during the wetting process by illustrating energy components of the entire system and find that the substrate with positive triangular stiffness and inverted triangular stiffness show opposite evolution laws. On a substrate with inverted triangular stiffness, the gravitational potential energy is more dominant.

关键词： Porous metal-matrix nanocomposite   Graphene nanoplatelets   Rotating microbeams   Modified couple stress theory   Dynamics   Thermal buckling  

摘要： A comprehensive dynamic model for thermal buckling, elastic vibration and transient response analysis of rotating nano-composite porous metal-matrix microbeams reinforced with graphene nanoplatelets (GNPs) under a uniform thermal gradient is proposed. Various pore distribution patterns are considered together with different GNPs dispersion rules according to the specific functions. The extended rule of mixture and Halpin-Tsai micromechanics model are employed to evaluate the effective material properties of the nanocomposites. Based on the modified couple stress theory and the improved third-order shear deformation theory, the dynamic equations of the rotating microbeam are established by the Lagrange's equation. The Chebyshev-based Galerkin method is adopted to discretize these equations, which are then solved by the complex modal analysis and Runge-Kutta-Merson method. Convergence study and comparisons with previous literature are conducted for validation of the present method. A parametric study performed analyzes the effects of angular velocity, thickness-to-length scale parameter ratio, porosity coefficient, weight fraction and geometry of GNPs together with distribution patterns of GNPs and pore on the critical buckling temperature rise, fundamental frequency and time-dependent response of the rotating nanocomposite microbeams. The results reveal significant effects of these parameters on the relevant mechanical behaviors, some of which are even contrary to expectations. Therefore, it is necessary to further study this kind of rotating nanocomposite structures for the optimal design.

关键词： 产教融合   飞机复合材料结构修理   教学改革   人才培养  

摘要： 为深化高职院校产教融合,坚持立德树人根本任务,以“飞机复合材料结构修理”课程为例,明晰教学目标,整合资源,重构教学内容,设置多层级递进式综合教学过程,即每个教学任务以“PDCA”(Plan、Do、Check、Action)循环教学法为主线,实施四阶段教学,根据多层级、多环节数据支撑进行综合性考核评价,并对教学内容设计、教学策略、教学过程、评价结果进行分析。

关键词： 生物质   相变材料   多孔碳   盐碱改性   复合材料  

摘要： 以天然生物质材料甘蔗渣为碳源,在氮气气氛下,用不同温度对其进行热处理,使生物质材料炭化并进一步石墨化转化,采用真空熔融浸渍法制备出具有生物质天然孔结构的多孔高导热碳基载体材料。为进一步提高载体材料在相变材料上的吸附率,采用不同质量的碱盐氢氧化钾(KOH)对炭化后的原料进行改性,制备了一系列形貌稳定的复合材料,并对其进行了泄漏实验,最终通过相关计算得到复合相变材料的最大吸附率。通过扫描电子显微镜(scanningelectronmicroscope,SEM)、傅氏转换红外线光谱分析仪(Fouriertransform-infrared spectroscopy,FT-IR)、热重分析仪(thermogravimetric analyzer,TG)、多功能X射线衍射仪(X-ray diffractometer,XRD)等仪器,采用差示扫描量热法(differentialscanningcalorimetry,DSC)、比表面及孔径分析法(Brunauer-Emmett-Teller,BET)等方法,对载体材料和复合材料的结构进行表征以及性能测试。结果表明,在750℃炭化后,用质量比为1∶4的KOH进行改性后制备得到的复合相变材料的吸附率最佳,为73.59%。XRD、FT-IR、SEM和TG结果表明,通过物理混合工艺制备的复合材料具有良好的化学相容性和耐热性。与以往的研究相比,本文制备的复合相变材料具有一定的竞争优势。

关键词： Carbon nanotubes  

摘要： Taking aero-engine compressor blades as the engineering background, the rotating blades were simplified into carbon nanotube reinforced composite (CNTRC) cantilever thin plates with pre-installation and torsion angles. The geometrical and physical parameters of CNTRC rotating blades were calculated by differential geometry theory and the extended rule of mixture. Considering the influence of centrifugal force, based on Kirchhoff hypothesis and Novozhilov theory, the partial differential kinetic equations of CNTRC rotating blades were established by Hamilton's principle. The partial differential equations of motion were discretised into ordinary differential equations by the Galerkin method. The free vibration characteristics of the CNTRC rotating blades were investigated. The effects of pre-installation angle, torsion angle, carbon nanotube volume fractions, carbon nanotube distributions, rotational speed, and hub radius on the natural frequencies of CNTRC rotating blades were analysed in detail. © 2025 Chinese Vibration Engineering Society. All rights reserved.