Thin-Walled Structures最新文献

{"title":"Achieving ultralow and highly isotropic thermal conductivity in coherent Si3N4 ceramics heterostructure: A machine learning potential-based molecular dynamics simulation study","authors":"Xiaoqian Gao ,&nbsp;Shu Lin ,&nbsp;Chuankui Xiao ,&nbsp;Jing Wan ,&nbsp;Yilun Liu ,&nbsp;Huasong Qin","doi":"10.1016/j.tws.2025.113751","DOIUrl":"10.1016/j.tws.2025.113751","url":null,"abstract":"<div><div>Achieving ultralow and highly isotropic thermal conductivity in thin-walled ceramic materials is critical for advanced thermal management and energy applications. In this study, we employ a machine learning potential-based molecular dynamics (MD) simulation to investigate the thermal transport properties of coherent silicon nitride (Si₃N₄) heterostructures. Our non-equilibrium molecular dynamics (NEMD) simulations, performed on samples with effective lengths ranging from 20 to 160 nm and considered temperatures between 300 K and 1200 K, reveal that the coherent <em>α</em>/<em>β</em>‑Si₃N₄ heterostructure exhibits dramatically reduced thermal conductivity compared to Si₃N₄ uniphases. Notably, the coherent <em>α</em>/<em>β</em>‑Si₃N₄ heterostructure demonstrates an ultralow and nearly isotropic thermal conductivity, with an extrapolated infinite-length value of approximately 5.69 W m⁻¹K⁻¹. This performance is attributed to a significantly reduced phonon mean free path resulting from the coherent interfaces, which mitigates the excitation of additional phonon modes. Furthermore, temperature-dependent analyses reveal an anomalous “thermal skip” behavior linked to partial phase transitions that modulate phonon scattering. These findings underscore coherent heterostructuring as a promising strategy for tailoring the thermal properties of Si₃N₄ ceramics for thermoelectric and thermal protection applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113751"},"PeriodicalIF":6.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From low velocity to real ammo impact behaviour of advanced aramid and UHMWPE composites","authors":"I. Rubio ,&nbsp;B. Valverde-Marcos ,&nbsp;J.A. Loya ,&nbsp;M.H. Miguélez","doi":"10.1016/j.tws.2025.113715","DOIUrl":"10.1016/j.tws.2025.113715","url":null,"abstract":"<div><div>This work presents a comparative analysis of the impact behavior high-specific-strength fiber-reinforced composite materials, specifically Aramid and UHMWPE, both widely used in the development of personal protective systems. For this study, specimens of the same thickness were considered to analyze the influence of areal density. The performance of these materials was evaluated under different impact scenarios representative of service conditions, including low-velocity impact using a drop tower, ballistic fragment impact, and ballistic impact with non-penetrating live ammunition. For each type of test, the energy absorption capacity and the extent of induced damage were analyzed using non-destructive inspection techniques, such as computed tomography. The results indicate that UHMWPE exhibits a significantly higher energy absorption capacity than the aramid fiber composite (20% in low and more than 70% in high velocity impacts, approximately); however, it also presents a greater extent of damage, which could compromise the structural integrity and safety of the component. Finally, it is concluded that the development of hybrid protective systems that combine these materials according to the different mechanical solicitations they may be exposed to could provide a more optimized performance compared to the independent use of each material.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113715"},"PeriodicalIF":6.6,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-velocity impact behavior of inert and reactive PELE projectiles against thin-walled targets","authors":"Wei Xian Lim ,&nbsp;Siyan Deng ,&nbsp;Qingjun Yu ,&nbsp;Wei Liang Goh ,&nbsp;Hay Yee Serene Chan ,&nbsp;Huey Hoon Hng","doi":"10.1016/j.tws.2025.113728","DOIUrl":"10.1016/j.tws.2025.113728","url":null,"abstract":"<div><div>Reactive projectiles offer enhanced lateral effects via impact-induced energy release, yet existing modeling approaches often lack the ability to accurately capture the complex interplay between mechanical fragmentation and chemical reactions. This work addresses this limitation by exploring the fragmentation dynamics, lateral dispersion, and reactivity of Penetrators with Enhanced Lateral Effects (PELE) containing inert (PTFE) and novel reactive fillings (BDO-FP/CuO/Al and Viton/Al), impacting thin-walled metallic plates at an initial velocity around 1000 m/s. Experiments employed a two-stage helium gas gun with high-speed cameras and flash X-ray imaging to visualize projectile–target interactions and perforation characteristics. Numerical simulations were conducted using Smoothed Particle Hydrodynamics (SPH) in LS-DYNA, incorporating Johnson–Cook constitutive laws, stochastic fracture models, and Ignition and Growth Reactive Model equations of state derived from <em>Ab Initio</em> molecular dynamics (AIMD) and computational fluid dynamics (CFD). Experimental results revealed that reactive fillings, particularly Viton/Al, exhibited significantly higher reaction intensity, characterized by intense combustion flashes and broader fragment dispersion with more severe perforation damage compared to inert PTFE. SPH simulations effectively reproduced these phenomena, capturing axial velocity attenuation and radial fragmentation, although minor discrepancies remained in dispersion magnitudes and local perforation geometries. Product species analysis showed that Viton/Al rapidly decomposes into abundant gas-phase species, driving pressure buildup and accelerating combustion. BDO-FP/CuO/Al exhibited delayed, multi-stage decomposition with larger fragments and slower energy release. By integrating experiments with SPH, AIMD, and CFD modeling techniques, this work provides comprehensive insights into PELE behaviors and facilitates the optimization of reactive material formulations for enhanced lateral damage effects.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113728"},"PeriodicalIF":5.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144716126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strain-induced twist regulation in bilayer graphene via lattice symmetry-broken","authors":"Zhi-Na Zhao ,&nbsp;Jian-Gang Guo ,&nbsp;Ying Liu ,&nbsp;Xin-Liang Li","doi":"10.1016/j.tws.2025.113748","DOIUrl":"10.1016/j.tws.2025.113748","url":null,"abstract":"<div><div>Interlayer rotation can regulate the mechanical, electrical, and optical properties of two-dimensional (2D) materials. Strain engineering is considered to be an effective method to control the interlayer twist angle of 2D materials. Strain-induced twist angle regulation in bilayer graphene via lattice symmetry-broken has not been reported. Based on the Kolmogorov–Crespi (KC) potential and Fourier expansion, the relationship between strain, interlayer energy landscape, and stable twist angle of the bilayer graphene was established. Combined with molecular dynamics (MD) simulations, the strain-induced evolution of three critical interfacial properties in bilayer graphene systems was investigated: interlayer energy landscape, stable twist angle, and moiré patterns. Energy minimization analysis shows that under the uniaxial tensile strain, the first stable twist angle is quasi-periodic regulated and size-dependent. The mechanism of angular regulation originates from strain-induced transformations in the interlayer energy landscape. Tensile strain regulates the interlayer energy landscape by promoting the evolution of the interfacial lattice moiré patterns, and thus regulates the stable twist angle within a certain range. This study presents a theoretical approach to regulate the interlayer stable angle of 2D materials by tensile strain, which provides theoretical support for the design of tunable twist electronic devices.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113748"},"PeriodicalIF":6.6,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of multiple freeplay and nonlinear damping on the nonlinear aeroelastic response of wing-control surface-tab system","authors":"Xin Wu ,&nbsp;Gaolei Li ,&nbsp;Yuan Yue","doi":"10.1016/j.tws.2025.113710","DOIUrl":"10.1016/j.tws.2025.113710","url":null,"abstract":"<div><div>This study investigates the nonlinear aeroelastic responses of a thin-walled wing model that integrates the main wing, control surface, and tab. The nonlinear equations of motion are formulated based on unsteady aerodynamic theory for thin wings (flat plates) in incompressible flow, incorporating the nonlinear effects of freeplay and damping in the control surface and tab. Bifurcation analysis is conducted as a function of airspeed using the pseudo-arclength continuation method combined with the deflation technique. The effects of different freeplay configurations on the onset of flutter and post-flutter dynamics are examined. Multi-degree-of-freedom cell mapping with numerical integration is used to track the evolution of the basins of attraction. Furthermore, the role of nonlinear damping location and intensity in flutter suppression and stability control is assessed. The results show that tab freeplay has a more significant dynamic impact than control surface freeplay, leading to diverse oscillations, including limit cycle, quasi-periodic, and chaotic types, with frequent flutter mode switching. Further analysis reveals that the system may exhibit multistability across different airspeed ranges. This behavior is closely tied to the structure of the basins of attraction and is influenced by freeplay nonlinearity and nonlinear damping. Additionally, unique isolated limit cycle branches appear in bifurcation diagrams, indicating significant flutter mode changes rarely observed in low-speed systems. The findings also show that nonlinear damping effectively suppresses flutter, reduces bifurcation occurrences, and improves system stability. Notably, nonlinear damping in the tab enhances stability more effectively than it does on the control surface.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113710"},"PeriodicalIF":6.6,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physics-informed KAN-coupled FEM for deformation analysis of complex shells","authors":"Min-Zhan Huang ,&nbsp;Yu-Xiang Peng ,&nbsp;Zhen-Tao Jiang ,&nbsp;Peng-Nan Sun ,&nbsp;Cai-Xia Jiang","doi":"10.1016/j.tws.2025.113725","DOIUrl":"10.1016/j.tws.2025.113725","url":null,"abstract":"<div><div>This study addresses the challenges of weak geometric adaptability and low computational accuracy in Physics-Informed Neural Networks (PINNs) for predicting static mechanical responses of complex shell structures. Despite growing applications of PINNs in shell static analysis, their use for complex geometries like stiffened shells remains hindered by limited network capacity, subpar training accuracy, and ineffective physical constraint enforcement. No reliable PINN solutions currently exist for such complex geometries. We propose an innovative computational framework that deeply integrates the Finite Element Method (FEM) with Physics-Informed Kolmogorov–Arnold Networks (PIKANs). The framework spatially discretizes shell structures using FEM, solves shell governing equations at each grid node, and establishes the neural network’s loss function based on these equations. Building on this foundation, an improved High-Order ReLU-KAN (HRKAN) is employed to construct the FEM-PIKAN computational model, which innovatively introduces sigmoid activation functions at the hidden layer inputs to significantly enhance the network’s nonlinear mapping capability. To validate the method’s effectiveness, systematic studies are conducted on four typical shell structures — flat plate, cylindrical shell, stiffened plate, and stiffened cylindrical shell — under body force, surface pressure, and concentrated loads. Additionally, the static response of a simplified submarine pressure hull subjected to complex loading scenarios was predicted. The results demonstrate that the proposed FEM-PIKAN method accurately predicts the static responses of various complex shell structures, providing a new paradigm for efficient and high-precision analysis of such structures. The source code is available at <span><span>https://github.com/whatuphmz/FEM-PIKAN</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113725"},"PeriodicalIF":5.7,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration isolation of fluid-conveying pipes with parallel retaining clips","authors":"Yao Chen ,&nbsp;Feng Liang ,&nbsp;Tian Nan ,&nbsp;Ji-Hou Yang ,&nbsp;Xiao-Dong Yang","doi":"10.1016/j.tws.2025.113744","DOIUrl":"10.1016/j.tws.2025.113744","url":null,"abstract":"<div><div>Retaining clips are indispensable components in aircraft engines, applied to secure oil pipes and enhance their stiffness. This paper develops a fluid-conveying pipe with multiple parallel retaining clips, which function as isolators to prevent vibrations from foundation excitations. The nonlinear governing equation is formulated using the Hamilton principle and discretized by the Galerkin method. The complex frequencies are obtained and validated via finite element (FE) simulation and comparison with existing literature, whereby the pipe stability is examined. The vibration isolation performance is evaluated in terms of the amplitude-frequency response and displacement transmissibility, which are attained by the harmonic balance method (HBM) combined with the arc-length continuation method, and are further verified using the Runge-Kutta (R-K) procedure. Numerical results demonstrate the excellent stability and vibration isolation performance achieved by the arranged retaining clips. However, they are sensitive to the clip parameters, including stiffness, damping, installation position and clip number. The fluid-structure interaction (FSI) broadens the high-frequency vibration isolation bands of the retaining clips, but it reduces the stability of the system. Therefore, a careful balance of various system parameters is required to ensure both robust stability and efficient vibration isolation.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113744"},"PeriodicalIF":6.6,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexural buckling and flexural–torsional buckling behaviour of S960 ultra-high strength steel (UHSS) welded T-section columns","authors":"Jinpeng Cheng ,&nbsp;Andi Su ,&nbsp;Ke Jiang ,&nbsp;Ou Zhao","doi":"10.1016/j.tws.2025.113745","DOIUrl":"10.1016/j.tws.2025.113745","url":null,"abstract":"<div><div>The structural behavior and resistance of S960 ultra-high strength steel (UHSS) welded T-section columns were investigated through comprehensive tests and numerical simulations in this paper. The experimental program was conducted on a total of ten S960 UHSS welded T-section column specimens, including the material tensile coupon tests, the measurements of initial geometric imperfections and the pin-ended column tests. In addition to the experiments, numerical simulations were performed. The finite element (FE) models were initially developed and validated in accordance with the test results, and then the validated FE models were utilized for parametric studies to generate additional numerical data. The applicability of the relevant design clauses in the European, American and Australian codes was evaluated based on test and numerical data pool. The evaluation results indicated that all three design standards offered rather conservative resistance predictions for S960 UHSS welded T-section columns failing by flexural buckling and flexural‒torsional buckling. Finally, a new design method based on the continuous strength method has been proposed, offering more accurate resistance predictions than the current design provisions.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113745"},"PeriodicalIF":6.6,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and experimental analyses of the coupled impact of corrosion and cracks on the ultimate strength of stiffened plates","authors":"Krzysztof Woloszyk ,&nbsp;Alicja Bera ,&nbsp;Jakub Kowalski ,&nbsp;Emil Roch ,&nbsp;Yordan Garbatov","doi":"10.1016/j.tws.2025.113711","DOIUrl":"10.1016/j.tws.2025.113711","url":null,"abstract":"<div><div>The objective of this study was to analyse how corrosion and cracks acting simultaneously affect the compressive strength of stiffened plates used in ship structures. The analysis covered experiments and numerical simulations. It was found that corrosion and cracks progressing together can significantly reduce the strength of these plates, especially slender ones, which may lose up to 60% of their capacity compared to intact plates. Due to its widespread nature, corrosion tends to impact strength more than cracking, leading to a considerable loss of stiffness crucial for preventing buckling. The employed Finite Element analyses were consistent with experimental results, validated by modern techniques such as Digital Image Correlation. This model effectively captured the effects of corrosion degradation and cracks on thin-walled structures but showed some discrepancies, particularly with slender plates. These analyses enhance the understanding of how complex ageing phenomena impact the integrity of steel structural components. Future research should investigate how these degradation mechanisms affect ship hulls, employing random modelling techniques for consequence reliability analysis. Additionally, further experiments on complex structural components will be important.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113711"},"PeriodicalIF":5.7,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient neural network approach for comprehensive analysis of fixed-guided beams","authors":"Fanhui Meng ,&nbsp;Bo Qi ,&nbsp;Zijian Jing ,&nbsp;Jin Wang ,&nbsp;Xin Li ,&nbsp;Junli Guo","doi":"10.1016/j.tws.2025.113732","DOIUrl":"10.1016/j.tws.2025.113732","url":null,"abstract":"<div><div>This paper conducts a research on the full-process mechanical behavior analysis of fixed guided beams. Compared with traditional neural network prediction technologies, there are significant differences in data characteristics, specifically manifested in a large number of output parameters and a small number of input parameters. Compared with network models such as MLP widely used in engineering, the prediction network model based on decision trees not only has higher accuracy but also features lower computational requirements. A fixed-step dataset of mechanical properties is generated through elliptic integration, and the trained decision tree-based neural network achieves excellent performance under multiple evaluation criteria. Finally, experimental results indicate that there are unpredictable factors between the theoretical and actual values of fixed guided beams, further elaborating on the application prospects of neural network technology in the future.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"216 ","pages":"Article 113732"},"PeriodicalIF":5.7,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}