Advanced Engineering Materials最新文献

Metamaterial Lattice Structures

The cover uses two colors to represent optimization strategies of “data-driven” (blue) and “mathematics-driven” (magenta). The main part is the stacked lattice structure, which points to the narrative object of the article. The top gear represents that the lattice structure will be used in advanced engineering fields after sufficient optimization. Further information can be found in the Review by Hong Zhang (10.1002/adem.20251701).

Thermomechanical Metamaterials

The cold spray technique, primarily meant for component repair applications, preserves the original material properties owing to non-melting, producing dense, well-adhered coatings with minimal oxidation or thermal distortion. The image illustrates the powder metals being deposited on the substrate from a spray gun, with a magnified inset showing the jetting behavior of individual particle during high-energy impact. The orientation maps of the powders in-flight and after coating, highlights the microstructural evolution in each impacted particle viz-a viz the whole coating. More information can be found in the Research Article by Malar Vadani, Sabeur Msolli, Ayan Bhowmik, and co-workers (10.1002/adem.202501848).

Ring–Arc Honeycomb Metamaterial Structures

Metamaterial structures have attracted significant attention owing to their superior energy absorption capabilities. The cover image showcases a novel ring–arc honeycomb (RAH) metamaterial structure, characterized by its distinctive double-plateau stress response. In comparison to the conventional re-entrant hexagonal (RE) honeycomb, the RAH structure exhibits a 282% enhancement in plateau stress and a 191% improvement in specific energy absorption, thereby demonstrating markedly improved energy dissipation capacity. Further information can be found in the Research Article by Tao Fu, Shengfei Wu, and Liang San (10.1002/adem.20251584).

Thermomechanical Metamaterials

The diode-engineered heat regulation pipe features a concentric structure with radial thermal diode units around a central water channel. In insulation mode (left), the diodes block heat loss in low temperatures; in absorption mode (right), they harvest external heat in high temperatures. This bidirectional design enables precise, energy-efficient thermal management of fluid transport. More information can be found in the Research Article by Jaehyung Ju and co-workers (10.1002/adem.202501280).

Composite Metal Foam

Entrapped air inside the airtight porosities of composite metal foam provides lightweightness and cushion-ability. This could boost the safety of a tank car upon impact, thereby protecting the environment from HAZMAT spillage and fire. More information about the results of both experimental and numerical approaches can be found in the Research Article by Afsaneh Rabiei and Aman Kaushik (10.1002/adem.202501605).

Dual-Material Deformable Units

In their Research Article (10.1002/adem.202501200), Zhutong Li, Xiang Peng, and co-workers investigate modular and programmable deformable structures based on the rigid-flexible combination of PLA and TPU. Results show that leveraging the modular and parametric design advantages of multi-material structures enables deformation modes such as expansion, bending, and torsion, and provides the capability for multi-modal coordinated deformation.

Electrospinning is a versatile technique for producing polymer nanofibrous fabrics with enhanced functionalities, making it attractive for next-generation respiratory protection. A major limitation of electrospun filters designed for submicron aerosol capture at ≥99.99% efficiency is their comparatively high breathing resistance relative to conventional glass fiber and expanded polytetrafluoroethylene (ePTFE) media. To address this limitation, this study introduces micropleated filters made by multiple-jet needleless electrospinning, where nanofibers are deposited onto uniaxially prestretched textile substrates. Upon release, the substrates contracted to their original dimensions, forming densely packed micro-pleats that increased the effective surface area without altering the overall filter size. Prestretching the substrate to 225% prior to nanofiber deposition produced a twofold increase in quality factor compared with nanofiber mats deposited on unstretched substrates, driven by improved submicron aerosol filtration and reduced pressure drop. The micro-pleated filters achieved quality factors exceeding 0.26 Pa⁻¹, comparable to high-performance ePTFE-based military gas mask filters and more than three times higher than glass fiber filters. The micropleated filters also outperformed ePTFE filters in capturing and releasing aerosolized MS2 bacteriophage. These findings demonstrate that micropleated electrospun filters offer a promising pathway toward high-efficiency, multifunctional filtration systems applicable to defense, healthcare, and environmental protection.

To investigate the effect of cell orientations on the compressive properties of Kelvin foams and compare them with Weaire–Phelan (W-P) foams, a semi-closed-cell Kelvin foam with a relative density (ρ_r) of 20% is 3D printed, followed by a quasi-static compression experiment to validate the ABAQUS model. Subsequently, ABAQUS is performed to analyze the compression behaviors of Kelvin foams with different cell orientations and ρ_r, and W-P foams with various ρ_r. The results indicate that compressive strength (σ_pk) of Kelvin/W-P foams is primarily governed by the number of vertical faces in unit cells, as these faces bear the primary load during service. Energy absorption (EA) is influenced not only by vertical faces but also by the cells′ deformation modes and stacking configuration. At low ρ_r, the W-P foams exhibit the highest EA due to the complex spatial distribution of cell faces and densely packed stacking of unit cells. With increasing ρ_r, Kelvin foams with various cell orientations gradually exhibit more EA than those of W-P foams, attributed to transitions in cell deformation mechanisms and stacking patterns. This article not only advances the modeling and fabrication of Kelvin/W-P lattice structures but also provides mechanical insights into the evolutionary advantages of foam self-organization.

This study introduces a novel auxetic metamaterial structure specifically engineered for protective sports equipment through a parametric design and additive manufacturing approach. Drawing inspiration from the intricate patterns of traditional Persian Lori rugs, a reentrant tubular lattice is conceived as a three-dimensional metamaterial capable of exhibiting a tunable negative Poisson's ratio. The structure is fabricated using high-resolution digital light processing (DLP) 3D printing with an ABS-like photopolymer, enabling precise reproduction of the complex geometry. Systematic variation of two key geometric parameters, wall thickness (0.8, 1.0, 1.2 mm) and cell width (2.75, 4.0, 5.25 mm), allowed rigorous parametric control of mechanical behavior. Combined finite-element analysis and experimental compression testing verified exceptional tunability in stiffness, energy absorption, and Poisson's ratio, which ranged from −1.09 to −2.3. The configuration with 1.2 mm thickness and 5.25 mm width demonstrated the highest stiffness and impact-energy absorption, highlighting its potential for helmets, elbow pads, and similar high-impact gear. The integration of culturally inspired geometry, metamaterial design principles, and precision DLP 3D printing establishes a unique pathway for next-generation protective equipment, showcasing how parametric control of auxetic metamaterials can simultaneously achieve lightweight construction, superior energy dissipation, and enhanced user comfort.

This study develops a novel melt foaming technique for fabricating aluminum foam-filled tubes (FFTs) with in situ bonding. Through a high-temperature foaming process within a dynamically rotating mold, the foam and tube of FFT are cofabricated. The microstructure of FFT is observed, and the compression performance of FFT is also explored. The results demonstrate that the plateau stress of FFT is 25.50 MPa. The energy absorption and specific energy absorption of FFT are 12.75 MJ m⁻³ and 15.0 kJ kg⁻¹, respectively. Due to the in situ bonding, the energy absorption of FFT is increased by 87.2%. The stress remains stable in the axial compression process, and no macroscopic fracture occurs in FFT. Finite element models based on specimens are reconstructed by X-ray tomography. The tensile test is applied to the tube of FFT to obtain the parameters of the finite element simulation. The results of the finite element simulation also show that the composite structure of FFT deforms cooperatively in axial compression. The purpose of this study is to provide a high-efficiency strategy for achieving a composite structure aluminum foam with superior energy absorption and overcoming bonding failure during the deformation process.