In the functional structures of aerospace carbon fiber-reinforced polymer (CFRP) composites, achieving the simultaneous enhancement of electromagnetic interference (EMI) shielding performance and mechanical properties remains a critical challenge. In this work, an efficient CFRP interfacial modification strategy combining electrodeposition with vacuum heat treatment is proposed to address the inherent trade-off between shielding effectiveness and mechanical performance of CFRP-EMI shielding materials. A neuronal-like micro-nano Ni coating is fabricated on carbon fiber surfaces to enhance electromagnetic shielding capacity. The formed discontinuous Ni─C miscible regions, Ni/NiO/C heterogeneous multiphases, and nanoporous structures effectively improve the interfacial integration between the matrix and coating, as well as the mechanical properties. In the X-band, the reflection loss, absorption loss, and total EMI shielding effectiveness are increased by 33%, 18.6%, and 22.5%, respectively, while the ductility is improved by 201.78%, realizing the synergistic promotion of electromagnetic shielding and mechanical performance. Combined with experimental characterization and molecular dynamics analysis, the growth mechanism of polycrystalline phases during interfacial evolution is further clarified. This study innovatively proposes a high-efficiency and controllable design strategy for advanced CFRP-EMI functional materials, which provides a promising solution for the application of lightweight, high-strength, and self-adaptive electromagnetic shielding in the design of next-generation multifunctional aerospace structures.

Functional structures that combine thermal protection with load-bearing capabilities represent an effective solution to hypersonic thermal-protection challenges. Here, we propose a Janus-like bio-inspired strategy for integrally 3D-printed bimetallic metamaterials. Inspired by shell bilayers, a heat-resistant AlSiFeMnNiMg alloy and a SiC-reinforced AlSi10Mg are arranged as an architected pair and fabricated via dual-hopper selective laser melting, with SiC volume fractions of 0, 4, and 8 vol%. In situ SEM tensile tests at 25°C and 250°C show that damage is confined to a narrow transition zone. Once one side softens, the bimetallic architecture redirects load to the other, forming non-percolating high-stress paths and stabilizing the plateau response. Quasi-static compression of Gyroid TPMS lattices with different SiC contents maps the composition-temperature space. Across temperatures, structures with 4 vol% SiC improve specific energy absorption by 11.72% and 18.67% in room temperature and by 10.28% and 18.8% in 250°C, achieving synergistic mechanical improvement and a stable energy-absorbing plateau under extreme environments. Relative to 0 and 8 vol%, where modulus mismatch precipitates premature localized collapse, 4 vol% SiC promotes a distributed shear-band network that delays failure and elevates load capacity. This work provides a practical pathway toward thermally protective and load-bearing integrated components for aerospace applications.

Composite wings with inherent morphological integration characteristics can demonstrate exceptional load-bearing and aerodynamic performance through thoughtful design, garnering significant interest from researchers in recent years. This paper addressed the optimization challenge related to the coupling of the main structural layout, dimensions, and layup sequence of composite wings. By taking into account design constraints such as strength, stiffness, mode, and manufacturing processes, we proposed a dual-layer optimization strategy for topology and size based on the concept of the ground structural method. Optimization and solution were achieved using duality theory, ultimately leading to a collaborative layout-size optimization design for composite materials. Furthermore, the methodology was validated using a UAV’s all-composite wing as a case study. The results confirmed the strong effectiveness and practicality of the collaborative optimization approach discussed in this paper.

Woven composite structures are inherently influenced by uncertainties across multiple scales, ranging from constituent material properties to mesoscale geometric variations. These uncertainties give rise to both spatial autocorrelation and cross-correlation among material parameters, resulting in stochastic strength performance and damage morphology at the macroscopic structural level. This study established a comprehensive multiscale uncertainty quantification framework to systematically propagate uncertainties from the microscale to the macroscale. A novel dual-correlation sampling approach, based on multivariate random field (MRF) theory, was proposed to simultaneously capture spatial autocorrelation and cross-correlation with clear physical interpretability. This method enabled a realistic representation of both inter-specimen variability and intra-specimen heterogeneity of material properties. Experimental validation via in-plane tensile tests demonstrated that the proposed approach accurately predicts not only probabilistic mechanical responses but also discrete damage morphology in woven composite structures. In contrast, traditional independent sampling methods exhibited inherent limitations in representing spatially distributed correlations of material properties, leading to inaccurate predictions of stochastic structural behavior. The findings offered valuable insights into structural reliability assessment and risk management in engineering applications.

Hydrogels are recognized as promising biomaterials in tissue engineering, playing key roles as adhesives, patches, dressings, and scaffolds for tissue repair. Their interactions with tissues, from the cellular to the entire tissue interface level, have made bioinspired surface modification a significant research focus. This review systematically examines the progress in hydrogel-based tissue engineering, emphasizing the benefits of interface modifications. It highlights key design principles, including surface structure optimization, material selection, crosslinking techniques, and advanced manufacturing strategies such as 3D bioprinting and electrospinning. The review discusses three core strategies: controlling hydrogel surface structures, chemical composition, and functionality. It explores the use of natural and synthetic materials, along with common physical and chemical crosslinking methods. Additionally, it evaluates the role of techniques such as grafting, coating, electrospinning, patterning, and 3D printing in creating bioinspired surfaces that closely mimic native tissue environments, enhancing tissue regeneration. The effectiveness of these surfaces in soft and hard tissue repair is assessed, suggesting that recent advancements offer valuable insights for hydrogel design and application, while outlining future directions for achieving successful tissue engineering outcomes, improving clinical therapeutic strategies, and expanding hydrogel-based technologies in regenerative medicine.

In the aviation industry, enhancing the corrosion resistance of metal components is crucial. Nickel coatings are commonly used for their protective properties, but they often have defects like porosity and coarse grains. This study investigates the addition of cerium (Ce), a rare earth element, to improve nickel coatings’ performance. NiCoCe alloy layers were electroplated onto Q235 steel, a material used in aircraft structures. The coatings were then modified through heat treatment and evaluated for corrosion resistance using immersion tests and electrochemical experiments. Results showed that at a current density below 0.04 A/cm2, increasing the current density refined the coating’s grains, enhancing compactness and corrosion resistance. However, excessive current density led to coarser grains and more surface defects, reducing corrosion resistance. The addition of Ce improved corrosion resistance by refining the grains. Heat treatment at 300–500 °C decreased corrosion resistance due to grain growth and reduced stability of surface oxides. These findings are significant for developing advanced coatings for aviation materials, where superior corrosion resistance is essential for aircraft component longevity and safety.

Magnesium (Mg) - Lithium (Li) alloys are the world's lightest alloys and thus have great application potential in the field of lightweight materials. Alloy element doping is a key strategy to enhance the thermomechanical properties of Mg-Li alloys, and first-principles calculations based on density functional theory (DFT) have become an important means to explore the doping strengthening mechanism. However, most existing studies adopt a top-down analysis approach, and the explanation of the strengthening mechanism of doped atoms is still shallow, failing to fully leverage the economic and efficiency advantages of computer-aided technology. This work systematically sorts out the core role of DFT in explaining the strengthening mechanism of metals, and through the construction of theoretical models and simulation calculations, reveals the electronic structure and chemical bond change rules at the atomic scale; it focuses on reviewing how DFT has helped to analyze the influence mechanisms of different doped elements on the crystal structure, mechanical properties, and corrosion resistance of Mg-Li alloys during their development process; and it discusses the application of DFT in the functional design of Mg-Li alloys. The research points out that the current application of DFT has limitations such as insufficient multi-scale coupling analysis and lagging experimental verification. Therefore, it is proposed to combine molecular dynamics simulation and high-throughput computing to provide theoretical support for the precise design and industrial application of doping strengthening of Mg-Li alloys, which has important scientific significance and practical value for promoting the development of the lightweight materials field.

The difference in the reactivity of carbon/carbon (C/C) composite constituents leads to complex oxidation morphology, which poses a challenge to the prediction of material decomposition and mechanical property degradation in an oxidizing environment. In this paper, a PD-FEM coupling approach is proposed to analyze the oxidation morphology evolution and through-thickness compressive failure after oxidation of C/C composites. For the oxidation analysis, a peridynamic oxidation model is developed to capture the oxidation interface of C/C composites at microscale and mesoscale. Based on the oxidation morphology, the microcracking-based finite element model is employed to calculate the compression failure. This approach is validated by the oxidation experiments and the experiments of compression after oxidation. Finally, the oxidation mechanism at different scales and the effect of oxidation on the compression failure behavior of C/C composites are investigated.

This study develops an Al-Si-Fe-Mn-Ni alloy featuring fine grains and stable grain boundaries to meet the stringent load-bearing requirements of additively manufactured components operating in high-temperature environments. By leveraging solid-solution and precipitation-strengthening mechanisms, we introduce Fe and Ni, two common transition-metal elements, to form high-density, thermally stable intermetallic compounds, which subsequently stabilize the grain boundary structure of the SLM-printed alloy. Mn addition further facilitates the precipitation of Al6Mn strengthening phases. These synergistic strengthening mechanisms lead to exceptional mechanical performance, with the composites achieving a tensile strength of 556 MPa and elongation of 5.3% at 25 degrees C and 372 MPa and 14.3% at 200 degrees C. Furthermore, the ultimate compressive strength of the G-type TPMS scaffold fabricated from this Al-Si-Fe-Mn-Ni alloy exhibits a 144% increase at 25 degrees C and 157% at 200 degrees C compared to AlSi10Mg. This study proposes a straightforward, reliable, and cost-effective strategy for designing a high-performance Al-Si alloy, offering a promising pathway for enhancing mechanical reliability and expanding industrial applications in extreme environments.

With the advancement of wearable and implantable medical devices, hydrogel flexible bioelectronic devices have attracted significant interest due to exhibiting tissue -like mechanical compliance, biocompatibility, and low electrical resistance. In this study, the development and comprehensive performance evaluation of poly(acrylic acid)/ N,N ' -bis(acryloyl) cystamine/ 1-butyl-3-ethenylimidazol-1-ium:bromide (PAA/NB/IL) hydrogels designed for flexible sensor applications are introduced. Engineered through a combination of physical and chemical crosslinking strategies, these hydrogels exhibit strong mechanical properties, high biocompatibility, and effective sensing capabilities. At 95 % strain, the compressive modulus of PAA/NB/IL 100 reach up to 3.66 MPa, with the loading -unloading process showing no significant hysteresis loop, indicating strong mechanical stability and elasticity. An increase in the IL content was observed to enlarge the porosity of the hydrogels, thereby influencing their swelling behavior and sensing functionality. Biocompatibility assessments revealed that the hemolysis rate was below 5 %, ensuring their suitability for biomedical applications. Upon implantation in rats, a minimal acute inflammatory response was observed, comparable to that of the biocompatibility control poly(ethylene glycol) diacrylate (PEGDA). These results suggest that PAA/NB/IL hydrogels hold promise as biomaterials for biosensors, offering a balance of mechanical integrity, physiological compatibility, and sensing sensitivity, thereby facilitating advanced healthcare monitoring solutions.

Abstract The application of high-strength, high-modulus carbon fiber with excellent properties such as high modulus, conductivity, and thermal conductivity has been increasingly widespread in aerospace flight, deep space exploration, and near-space vehicles. In recent years, with the continuous enhancement of functional requirements for products in these domains, there is a growing need to optimize the typical structure of such carbon fibers to enhance their load-bearing capacity. Therefore, in this study, we first conducted basic mechanical performance tests on specimens of T1100/5405 composite materials to obtain fundamental mechanical performance parameters of the material. Subsequently, compression and bending performance tests were performed on a typical hat-shaped structure to understand its actual load-bearing capacity and failure modes. The results indicate that the compressive failure load and bending failure load of the hat-shaped structure are 474.44 kN and 27.365 kN, respectively. Additionally, by combining the fundamental mechanical performance parameters of the composite material, the mechanical performance of the hat-shaped structure was simulated and verified using finite element analysis software, with the model validated using experimental data. Finally, layering parameters of the established finite element model were optimized, resulting in an increase of the structure’s load-bearing capacity under compression and bending loads to 662.629 kN and 31.9059 kN, respectively. In conclusion, the optimization approach presented in this paper for the T1100/5405 composite material’s hat-shaped structure is efficient. It yields noticeable improvements, significantly enhancing the load-bearing capacity of the typical structure in various application scenarios.

Developing patches that effectively merge intrinsic deformation characteristics of cardiac with superior tunable mechanical properties remains a crucial biomedical pursuit. Currently used traditional block-shaped or mesh patches, typically incorporating a positive Poisson's ratio, often fall short of matching the deformation characteristics of cardiac tissue satisfactorily, thus often diminishing their repairing capability. By introducing auxeticity into the cardiac patches, this study is trying to present a beneficial approach to address these shortcomings of the traditional patches. The patches, featuring the auxetic effect, offer unparalleled conformity to the cardiac complex mechanical challenges. Initially, scaffolds demonstrating the auxetic effect were designed by merging chiral rotation and concave angle units, followed by integrating scaffolds with a composite hydrogel through thermally triggering, ensuring excellent biocompatibility closely mirroring heart tissue. Tensile tests revealed that auxetic patches possessed superior elasticity and strain capacity exceeding cardiac tissue's physiological activity. Notably, Model III showed an equivalent modulus ratio and Poisson's ratio closely toward cardiac tissue, underscoring its outstanding mechanical potential as cardiac patches. Cyclic tensile loading tests demonstrated that Model III withstood continuous heartbeats, showcasing outstanding cyclic loading and recovery capabilities. Numerical simulations further elucidated the deformation and failure mechanisms of these patches, leading to an exploration of influence on mechanical properties with alternative design parameters, which enabled the customization of mechanical strength and Poisson's ratio. Therefore, this research presents substantial potential for designing cardiac auxetic patches that can emulate the deformation properties of cardiac tissue and possess adjustable mechanical parameters.

The mechanical behaviors of hybrid metal-composite joints with different protrusion densities were investigated by combining numerical and experimental methods. High-fidelity finite element models that considered the failure modes of all components were developed, and specimens based on metal additive manufacturing technology were tested under quasi-static tensile load to verify the numerical calculations. The results showed that the load capacity and the dominant fracture mode of joints were significantly affected by the metal protrusion density. The failure mechanisms of joints under different protrusion conditions exhibited a clear difference, which proved the possibility of an optimal and functional joint design.

为了提升航空专业协同育人水平,以西北工业大学民航学院航空专业本科生主干课程为对象,探讨航空专业"课程思政—虚拟实践—科研育人"协同育人体系的构建与框架优化方法,初步建立以培养高素质航空人才为主要目标、以开发典型案例数据库为主要手段、以形成示范性教学方法为主要措施的航空专业协同育人体系,旨在为航空及相关专业协同育人改革提供参考.

In this paper, a peridynamic model based on generalized thermoelastic theory is derived by irreversible thermodynamics. This model avoids the spatial derivative and can be easily applied to generalized ther-moelastic problems with discontinuities. The transient temperature response is captured using the non -Fourier CattaneoVernotte (C-V) model. The interaction integral is employed to calculate the transient ther-mal stress intensity factors (TSIFs). Numerical examples are presented for analyzing the effects of crack orientation angle and multi-crack distribution on transient thermoelastic response. And the crack propa-gation behavior under non-Fourier thermal shock is further discussed in detail. It is found that with the increase of the angle between inner crack and heating boundary, the sensitivity of mode-I TSIFs to the non-Fourier effect increases, while the sensitivity of mode-II TSIFs to the non-Fourier effect decreases. This peridynamic model may be useful for understanding the crack behaviors of thermal protection ma-terials under thermal shock.& COPY; 2023 Elsevier Ltd. All rights reserved.

不具有独立法人资格的中外合作办学机构(非法人机构)是新时代培养具有中国情怀和国际视野的未来人才的重要阵地.系统、全面构建非独立法人中外合作办学机构思政育人体系,是非法人机构落实立德树人根本任务的理论自觉和实践担当.本研究在分析非法人机构思政育人体系构建的必要性、厘清非法人机构思政教育内涵和目标的基础上,以西北工业大学伦敦玛丽女王大学工程学院思政育人体系构建为例,分析非法人机构在思政育人的实践困境,建议非法人机构创新完善思政育人体系,提升育人主体合力;分类引导思政教育重点,夯实育人要素基础;整合育人资源,构建全方位育人格局.

In this paper, the transient temperature response of a cracked plate under thermal shock is investigated. To eliminate the problems caused by the assumption of infinite heat prop-agation speed, the non-Fourier heat transfer theory is adopted. A peridynamic model is developed to consider the non-Fourier effect, the orthotropy of thermal conductivity, and the crack thermal resistance. This model avoids the spatial derivative and is efficient to analyze the problems with discontinuities. Based on the Kapitza thermal resistance model, a thermal resistance bond is proposed to deal with the uninsulated crack. The explicit and implicit discrete schemes of peridynamic formulation are presented to solve the temper-ature field. The model is verified by the analytical solution and excellent agreements are obtained. For the non-Fourier phenomenon observed in bismuth, numerical examples are presented for analyzing the effects of crack thermal resistance, crack orientation angle, and multi-crack distribution on non-Fourier heat transfer. & COPY; 2022 Elsevier Inc. All rights reserved.

Due to the coupling effects between stresses in different directions, the mechanical behavior of an advanced composite material under multiaxial loading is extremely complex. In this study, the influence of through-thickness compressive stress on the interlaminar shear performance of a carbon fiber-reinforced composite was experimentally investigated. Hollow cylindrical unidirectional laminate specimens were fabricated to conduct combined compression-shear tests, and the fracture morphologies of the specimens were characterized to reveal their failure behavior. The results indicate that a moderate compression load significantly enhanced the shear properties of the laminate by inhibiting crack propagation and improving the friction effect. The shear strength and modulus of a laminate specimen subjected to combined stresses improved up to a maximum of 76% and 231%, respectively, over those of an equivalent specimen subjected to pure shear. However, as the applied through-thickness load approached the compressive strength of the laminate, the specimen shear capacity began to decline owing to the transition of fracture mechanisms. Indeed, the specimens exhibited mixed failure modes corresponding to the different stress states, which were induced by the combined effects of through-thickness compressive and shear stresses. As the applied through-thickness compressive stress increased, the dominant failure mode of the laminate specimen changed from fiber-matrix debonding to fiber shearing and then to fiber breakage, resulting in various shear performances.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

The oxidation induced by coating cracking is a general failure mode of high-temperature composites such as C/C and C/SiC. However, this failure mode has not been fully investigated due to the lack of a method suitable for both crack simulation and oxidation interface capture. In this paper, a coupled thermo-mechanical-oxygenic peridynamic model is proposed for SiC-coated C/C composites in an oxidizing environment. The ordinary state-based peridynamics is extended to plane strain thermoelastic problems for orthotropic media to calculate the crack distribution. Cracks in the coating are modeled as oxygen diffusion channels and the peridynamic oxidation equation is developed to simulate the oxidation of the C/C substrate. Furthermore, the peridynamic non-Fourier heat transfer equation is employed to consider the finite thermal propagation speed and the model is validated by experimental results. Numerical examples are presented to investigate the oxidation failure after thermal shock, non-Fourier thermal shock fracture, and stress oxidation failure of SiC-coated C/C composites.

针对3 种不同搭接板厚度的铝合金和碳纤维增强树脂(Carbon fiber reinforced polymers,CFRP)复合材料三钉螺栓连接结构,分别进行了常温(25℃)和高温(150℃)环境下的准静态拉伸力学性能测试.同时建立有限元三维模型,结合Hashin失效准则和渐进损伤准则进行数值模拟分析,获得了结构的高温承载特性与损伤演化规律.研究结果表明,对于D1、D2、D3 这 3 种不同铝合金厚度的连接结构,在 150℃时的极限载荷试验值相对 25℃分别降低 6.63%、13.07%、8.48%,且常温环境下3 种结构破坏模式分别为铝合金拉伸断裂、复合材料挤压失效、复合材料拉伸断裂,而在150℃高温环境下,3 种结构损伤模式都为复合材料孔边的挤压剪切失效.