Thin-Walled Structures最新文献

{"title":"Experimental and numerical analysis on progressive failure of hat-stiffened composite panels under four-point bending: effect of skin stiffness variation","authors":"Tianyu Wu ,&nbsp;Jiafan Feng ,&nbsp;Bojian Li ,&nbsp;Bowen Gong ,&nbsp;Yuzhong Ge ,&nbsp;Wenting Ouyang ,&nbsp;Huan Wang ,&nbsp;Han Wang ,&nbsp;Hua-Xin Peng","doi":"10.1016/j.tws.2026.114665","DOIUrl":"10.1016/j.tws.2026.114665","url":null,"abstract":"<div><div>Hat-stiffened composite panels are critical structural components of aircraft fuselages, resisting significant bending loads under service conditions. Increasing skin stiffness is considered an approach to enhance their bending performance. In this study, specimens with three skin configurations were used, namely SP-12 (12-ply skin), SP-16 (16-ply skin), and SP-26 (26-ply skin). The effect of varying skin stiffness on four-point bending process was investigated through experiment and progressive damage simulation. It was observed that SP-12 exhibited brittle failure characterized by a single load drop, while SP-16 and SP-26 exhibited progressive failure characterized by multiple load drops. Higher skin stiffness significantly enhanced both initial damage load and final debonding failure load, while reducing the bending deformation. This was because increasing skin stiffness required higher load to drive bending deformation, while the interface strength was not enhanced. Varying skin stiffness altered the shear stress distribution, leading to additional debonding and changes in fracture mode at stringer-filler co-curing interface in SP-16 and SP-26. Delamination also occurred at stringer corners in these specimens affected by higher damage load. This also caused severe intralayer damage and cracks under higher load-bearing capability induced by skin stiffness increasing. Based on the above observations, this study provides insights into improving the bending performance of hat-stiffened composite panels.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114665"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387277","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":"Designing lightweight nanolattices: multiscale optimization of geometry and size effects","authors":"Hyoui Yoon ,&nbsp;Hyobi Lee ,&nbsp;Sangryun Lee","doi":"10.1016/j.tws.2026.114704","DOIUrl":"10.1016/j.tws.2026.114704","url":null,"abstract":"<div><div>Lattice–truss structures have emerged as lightweight architected materials capable of achieving exceptional stiffness-to-weight ratios through geometry-driven design. Nanolattice architectures—composed of periodic networks of nanoscale beams—offer an opportunity to realize lightweight yet mechanically robust materials, whose properties can surpass those of bulk alternatives. However, the mechanical behavior of nanolattices remains difficult to predict accurately, as intrinsic size effects due to surface stresses can substantially alter nanolattice properties. Although multiscale approaches coupling atomistic simulations with continuum models have been employed, the individual contributions of surface-induced stresses and geometric design to nanolattice stiffness have not been clearly distinguished. To address this issue, this study introduces a unified multiscale framework that explicitly separates and quantifies surface-stress effects and beam geometry effects in nanolattice structures. By coupling molecular statics (MS) simulations with finite element analysis (FEA), the mechanical behaviors of body-centered (BC) and octet-truss (OT) lattices are evaluated under controlled beam geometries and lattice size variations. The results demonstrate that the optimal geometries identified at the continuum scale remain valid at the nanoscale when surface effects are incorporated. Surface-stress-corrected MS results exhibit strong agreement with FEA predictions, confirming that geometry-driven stress redistribution, rather than intrinsic surface tension, governs the effective stiffness response. Both BC and OT lattices exhibit a size-dependent stiffening trend, originating from the increase in the axial stiffness of individual nanobeams as their diameter decreases. These findings elucidate how geometry, scale, and surface energy collectively govern mechanical stiffness in nanolattices, providing fundamental design guidelines for lightweight and high-stiffness nanoscale architectures.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114704"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386404","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":"Local buckling behaviour and design of laser-welded stainless steel I-section stub columns after exposure to elevated temperatures","authors":"Shuai Li ,&nbsp;Fangying Wang ,&nbsp;Tong Guo","doi":"10.1016/j.tws.2026.114682","DOIUrl":"10.1016/j.tws.2026.114682","url":null,"abstract":"<div><div>Laser welding is a high precision joining technique that uses a focused laser beam to fuse metals with minimal heat input. Compared with conventional arc welding, it produces deep and narrow welds with limited thermal distortion and reduced residual stresses, thereby ensuring high fabrication accuracy and favourable mechanical performance. Recently, laser-welded stainless steel structural members have been gaining attraction in offshore and marine engineering applications, where durability and corrosion resistance are critical. Nevertheless, stainless steels exhibit pronounced degradation in mechanical properties when exposed to elevated temperatures, highlighting the necessity for reliable assessments of post-fire residual resistances to support cost-effective retrofitting and reuse. This paper presents experimental and numerical studies on the local buckling behaviour and residual cross-section compression resistances of laser-welded stainless steel I-section stub columns after exposure to elevated temperatures. An experimental study was firstly performed, which included heating and cooling of stub column specimens as well as post-fire initial local geometric imperfection measurements and 24 concentric compression tests, with the exposure temperatures ranging from 30 °C to 1000 °C and their influences on post-fire residual resistances discussed. A subsequent numerical study was conducted to repeat the test results and used to carry out parametric studies to generate additional numerical data. Due to the lack of specific design codes for stainless steel structures after exposure to elevated temperatures, the relevant design rules at ambient temperature, as given in the European code, American specification and continuous strength method, were evaluated, using post-fire material properties, for their applicability to laser-welded stainless steel I-section stub columns after exposure to elevated temperatures. The evaluation results revealed that (i) two sets of codified ambient temperature slenderness limits were accurate and safe when used for cross-section classification of laser-welded stainless steel I-section stub columns after exposure to elevated temperatures, (ii) both design codes led to slightly conservative post-fire residual resistance predictions, and (iii) the continuous strength method resulted in an improved level of design accuracy and consistency over the codified design rules, owing to the rational consideration of the favourable strain hardening of stainless steels and constituent plate element interactions within cross-sections.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114682"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386406","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":"Non-planar additive manufacturing continuous fiber reinforced composite curved grid structure and its impact characterization","authors":"Shouling Ding ,&nbsp;Bin Zou ,&nbsp;Qingyang Liu ,&nbsp;Jiabing Zhu ,&nbsp;Xinfeng Wang ,&nbsp;Zhiqi Liu","doi":"10.1016/j.tws.2026.114701","DOIUrl":"10.1016/j.tws.2026.114701","url":null,"abstract":"<div><div>The escalating applications of curved grid structures have imposed increasingly stringent demands on their performance. To leverage the excellent mechanical properties of continuous fibers alongside the design flexibility provided by additive manufacturing, it is essential to investigate non-planar additive manufacturing techniques for continuous fiber curved grid structures. This paper proposes a fiber staggered path planning method for grid structures, and curved grid structure specimens were manufactured using non-planar 3D printing. Experiments were conducted to examine the dynamic response and failure modes of curved grid specimens with varying structures and fiber materials under low-speed impact loads. The results indicate that during the impact process, the impact force threshold corresponding to the onset of fiber damage in the tilted grid specimens increases significantly, showing a 55.2% improvement compared to the vertical grid structures. This enhancement improves impact load resistance and reduces damage. Furthermore, among the tilted grid structures, the Kevlar fiber specimens demonstrate superior energy absorption capabilities, achieving an absorption rate of 97.7% without any fiber damage, thereby exhibiting enhanced impact resistance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114701"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386407","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":"Compact neural network-enhanced synthesis of a novel decoupled 2-DOF tilt stage based on graded auxetic and contracting honeycomb","authors":"Tingting Ye ,&nbsp;Zhao Feng ,&nbsp;Yangmin Li","doi":"10.1016/j.tws.2026.114697","DOIUrl":"10.1016/j.tws.2026.114697","url":null,"abstract":"<div><div>Given the increasing demands for large strokes with low coupling for micro/nanomanipulation, a novel compact tilt stage is proposed based on the graded auxetic metamaterial to provide two degrees-of-freedom (DOFs) rotation motions in this paper. Firstly, graded auxetic and contracting structured honeycombs are designed with parallel combinations to provide amplified displacements driven by piezoelectric stacks, applying the orthogonal layering configuration with spatial distribution to alleviate rotation coupling. Compared with other tilt stages, larger rotation stroke and lower rotation coupling are yielded with compact dimension, attributed to intensive honeycomb structures. Then, the attention mechanism is involved in a compact neural network model to predict boundary conditions of the elliptical integral model, improving accuracy and simplifying derivation. Through sensitivity analysis and parametric optimization, the structural parameters are determined. To validate the effectiveness of design and modeling, the prototype of the proposed 2-DOF tilt stage is fabricated with the volume of 29*29*32 mm<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>. Experimental results show the rotation strokes of 17.98 and 18.82 mrad, with the coupling ratio of 0.46% and 0.45%, respectively.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114697"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386449","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":"Refined geometry reconstruction and force identification of cable net structures using 3D point clouds","authors":"Jinzhi Wu,&nbsp;Sifan Feng,&nbsp;Yu Xue,&nbsp;Guojun Sun","doi":"10.1016/j.tws.2026.114651","DOIUrl":"10.1016/j.tws.2026.114651","url":null,"abstract":"<div><div>Accurate identification of cable forces is critical for the construction monitoring and long-term health assessment of large-span cable net structures. Conventional techniques—such as force sensors and frequency-based methods—often suffer from high costs, limited measurement coverage, and inaccuracies caused by complex boundary conditions. To address these limitations, this study proposes a refined global force identification framework that integrates geometry reconstruction from 3D laser-scanned point clouds with equilibrium-based self-stress analysis. Unlike simplified \"line-point\" models, the proposed approach accounts for the volumes of joints. A four-step automated procedure is developed to remove redundant objects, segment cable members, extract cable axes, and assemble rigid-body joint models. Based on this refined geometric model, self-stress modes satisfying equilibrium conditions are obtained. The global cable forces are then derived by determining the combination coefficients of self-stress modes using a limited subset of measured forces. By employing alternative self-stress modes, the method achieves robustness against measurement noise. Numerical simulations verified accuracy within 3% under ±5 mm geometric errors, while experimental validation on a cable net structure achieved a mean relative error of 9.89%. The findings demonstrate the potential of this method for efficient global force identification in cable net structures.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114651"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386821","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":"Theoretical-experimental investigation on mechanical response of Al honeycomb sandwich under static compression and high-velocity impact","authors":"Raffaele Barbagallo ,&nbsp;Giuseppe Bua ,&nbsp;Girolamo Costanza ,&nbsp;Fabio Giudice ,&nbsp;Giuseppe Mirone ,&nbsp;Andrea Sili ,&nbsp;Maria Elisa Tata","doi":"10.1016/j.tws.2026.114673","DOIUrl":"10.1016/j.tws.2026.114673","url":null,"abstract":"<div><div>This paper reports a theoretical-experimental investigation aimed at characterizing the penetration behavior and ballistic limit, the energy absorption capabilities, and the impact force attenuation effect of an Al alloy sandwich panel with honeycomb core 50 mm thick, under normal impact by spherical projectiles. The analytical model used to estimate the ballistic limit has been developed according to the energy conservation-based approach, which allows to evaluate the effect of dissipation mechanisms through the elements constituting the sandwich panel. The experimental investigation has been conducted under quasi-static and high-velocity impact conditions (150–250 m/s), characterizing the out-of-plane compressive behavior and the dynamic response (ballistic limit, absorbed energy, impact force). The theoretical and experimental investigations as a whole outline an integrated approach where analytical modeling, calibrated and validated by experimental results, can be adapted to each specific application, and allows to characterize and predict the potential of the honeycomb core as an effective element for energy dissipation, and impact force attenuation, so to define the actual role for the overall penetration behavior. As main results of the investigation, for the starting configuration of the sandwich a ballistic limit of 195 m/s, an average value of energy absorption of 40.37 J, with about only 15% due to the honeycomb, and an average value of maximum impact load of 0.776 kN has been found, with substantial consistency between experimental and theoretical results. Projections by varying the main geometric parameters of the honeycomb allow to define high-potential conditions for energy absorption increase and further impact force attenuation.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114673"},"PeriodicalIF":6.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386836","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":"Experimental investigation and finite element analysis of steel frame infill CLT panel hybrid structure","authors":"Yinlan Shen ,&nbsp;Ziyang Nie ,&nbsp;Shijie Xiang ,&nbsp;Guofang Wu","doi":"10.1016/j.tws.2026.114976","DOIUrl":"10.1016/j.tws.2026.114976","url":null,"abstract":"<div><div>This study presents an experimental and numerical investigation into the hysteretic behavior and lateral load-resisting performance of a steel-frame-infilled cross-laminated timber (CLT) shear wall system with bracket-type connections. Quasi-static cyclic tests were conducted on half-scale specimens: a pure steel frame (PF) and a steel–CLT hybrid wall (FSW). The validation of the numerical model of the hybrid steel-CLT wall was conducted through experimental data in OpenSEES. Furthermore, a series of parametric analyses were performed to examine the effects of connection strength and connection spacing on lateral resistance and internal force distribution of the hybrid wall. Results demonstrate that the CLT infill significantly enhances lateral load-resisting performance: the hybrid system (FSW) achieves a 41.4% increase in peak lateral load, a 30.9% improvement in initial elastic stiffness, and a 62.4% gain in cumulative energy dissipation relative to the bare steel frame (PF). Critical failure modes observed in the steel–CLT hybrid wall include screw shear fracture at bracket connections, rotational deformation of the CLT panel, and localized flange buckling in steel columns. The validated numerical model well captured the mechanical behavior of the hybrid structure. To ensure structural efficiency of the hybrid shear wall system, it is beneficial to use strong bracket connections to make sure the shear force can be transferred and shared effectively between the CLT wall and the steel frame.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"227 ","pages":"Article 114976"},"PeriodicalIF":6.6,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147682484","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":"Nanoindentation of Graphene: Role of Unclamped Edges and Interlayer Slip","authors":"Xiaowen Liang ,&nbsp;Jie Gu ,&nbsp;Junen Niu ,&nbsp;Lingxiao Gao ,&nbsp;Cuihua An ,&nbsp;Qibo Deng ,&nbsp;Shuai Wu ,&nbsp;Ning Hu","doi":"10.1016/j.tws.2026.114982","DOIUrl":"10.1016/j.tws.2026.114982","url":null,"abstract":"<div><div>Precise control over nanodevice performance depends on the understanding of interlayer and interfacial interactions in 2D layered materials. Accordingly, interfacial control of stress and deformation of 2D materials has garnered increasing attention in recent years. Here, we employ molecular dynamics simulations to systematically examine the nanoindentation response of suspended graphene, focusing on the effects of edge constraints (fixed-edge vs. unclamped-edge) as well as the resulting interlayer slip. The presence of sliding area would relieve in-plane stress concentration and improve the fracture strength and toughness, leading to a similar maximum indentation depth regardless of layer number. The atomic behavior within the sliding region is closely related to the failure mode of multilayer graphene, due to the variation of interlayer coupling. Interlayer dislocation analysis of trilayer graphene proves that the unclamped edges would promote the adjustment of stacking structure and interlayer slip during nanoindentation. These findings underscore the critical role of interfacial states and interlayer sliding mechanisms in governing the mechanical behavior of graphene, paving the way for the development of flexible electronic devices with superior mechanical properties and enhanced reliability through targeted interface engineering.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"227 ","pages":"Article 114982"},"PeriodicalIF":6.6,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147682554","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":"A novel In-situ repair method of 7075 Al laminated interference-fit bolted joints under stress wave impact driven bushing cold expansion: numerical simulation and experimental validation","authors":"Mengyang Cui ,&nbsp;Duquan Zuo ,&nbsp;Haolin Ding ,&nbsp;Rongmin Tu ,&nbsp;Yuqin Chen ,&nbsp;Zhongbo Zhang ,&nbsp;Chong Gao","doi":"10.1016/j.tws.2026.114975","DOIUrl":"10.1016/j.tws.2026.114975","url":null,"abstract":"<div><div>Interference-fit bolted joints are easily damaged due to alternating load and overload impact, and their repair quality is directly related to the re-service safety of aircraft thin-walled structures. Aiming at the actual repair requirements of the shaking head part of the thin-walled connection area between the wing and the fuselage, this paper innovatively proposes a bushing cold expansion interference composite strengthening repair method based on stress wave impact loading. It establishes a finite element simulation model of the whole process of repairing the damaged joint of an Al single-lap thin-walled laminated structure. The accuracy and reliability of the model are verified by comparative tests and simulations. Furthermore, the evolution rules of indentation load, plastic deformation around the hole, strengthening area and microstructure characteristics under different expansion amounts were analyzed, and the unique advantages of the composite strengthening method in improving the repair quality of thin-walled joints were proved from multiple perspectives. The results indicate that a friction retardation effect occurs at the interface of the bushing hole wall during the composite strengthening process. Under the appropriate expansion amount, this effect helps to increase the residual compressive stress amplitude and its radial action depth. Under the optimal expansion amount of 2.0% (<em>E</em>₃), the distribution uniformity of residual compressive stress on the hole wall of the repaired part is the best, and the proportion of stress units is as high as 72.17%. The arc shape of the micro-grain boundary around the hole is moderate, the assembly gap is significantly reduced, and the exit tumor damage is slight. This fully confirms that the repair process of damaged joints can balance the strengthening effect and structural integrity by optimizing the expansion amount, to promote the transformation of residual tensile stress or zero stress unit on the hole wall to residual compressive stress, effectively inhibit the initiation and propagation of fatigue cracks, and realize the leap from geometric recovery to the structural integrity improvement of the repaired part.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"227 ","pages":"Article 114975"},"PeriodicalIF":6.6,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147682480","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}