Thin-Walled Structures最新文献

{"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":"Multi-objective optimization of FG-TPMS plates based on isogeometric analysis","authors":"Chenxu Chu ,&nbsp;Chao Wang ,&nbsp;Yun Chong ,&nbsp;Xiaolu Wang","doi":"10.1016/j.tws.2026.114591","DOIUrl":"10.1016/j.tws.2026.114591","url":null,"abstract":"<div><div>This paper proposes a novel methodology for the optimizing the material distribution of functionally graded triply periodic minimal surface (FG-TPMS) plates. The approach integrates isogeometric analysis (IGA) with simple first-order shear deformation theory (S-FSDT) to accurately capture the mechanical behavior of FG-TPMS plates. A recently proposed adaptive multi-objective chaotic particle swarm optimization (MOACPSO) algorithm is employed to solve minimization problems with mixed constraints. This algorithm effectively enhances the balance between the local and global search abilities, consequently improving the accuracy and convergence speed of the solution. The material distribution is parametrically defined utilizing B-spline basis functions, with thickness direction control points serving as the design variables. The optimization objectives are established as maximizing the first natural frequency and the minimizing structural weight. Numerical examples of square, circle, quarter of a circular and snowflake plates illustrate the optimized material distributions of representative elite solutions and corresponding first form modes. These results collectively validate the feasibility of the proposed method for optimizing the material distribution of FG-TPMS plates.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114591"},"PeriodicalIF":6.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081147","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 machine learning and multi-source authentic data-driven framework for accurate fatigue life prediction of welds in existing steel bridge decks","authors":"Haiping Zhang ,&nbsp;Lei Zhao ,&nbsp;Fanghuai Chen ,&nbsp;Yuan Luo ,&nbsp;Xinhui Xiao ,&nbsp;Yang Liu ,&nbsp;Yang Deng","doi":"10.1016/j.tws.2026.114559","DOIUrl":"10.1016/j.tws.2026.114559","url":null,"abstract":"<div><div>To address the challenge of inaccurate fatigue life prediction for welds in existing orthotropic steel bridge decks (OSBDs), which stems from incomplete information and insufficient model generalizability, this paper proposes a precise prediction framework that integrates multi-source authentic data and machine learning. Firstly, a U-Net model is employed to achieve automated identification and measurement of the OSBDs’ geometric parameters, resolving the issue of distorted resistance information. Secondly, based on wavelet analysis, strain data from bridge health monitoring is denoised and reconstructed, establishing an authentic stress time-history database. To tackle the scarcity of fatigue test data, a Gaussian Variational Bayesian Network- Attention (GVBN-Attention) prediction model is developed. This model enhances the identification of key features through a self-attention mechanism and quantifies parameter uncertainty using variational Bayesian inference. Experimental results on 192 sample sets demonstrate that the proposed GVBN-Attention model significantly outperforms comparative models, including Gaussian Process Regression (GPR) and Bayesian Neural Networks (BNNs), on key metrics such as the coefficient of determination and root mean square error, exhibiting superior predictive accuracy and generalization capability. Furthermore, SHAP (SHapley Additive exPlanations)-based interpretability analysis reveals the influence mechanisms of input features like stress amplitude and deck plate thickness on fatigue life, validating the rationality of the model's decision-making. This study provides a new method for fatigue life assessment of steel deck welds under data-scarce conditions, characterized by high accuracy, interpretability, and uncertainty quantification.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114559"},"PeriodicalIF":6.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079337","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":"Dynamic evolution of wall pressure reflection coefficient and structural response characteristics of stiffened cylindrical shells subjected to underwater explosion loads","authors":"Yuheng Liu ,&nbsp;Kun Zhao ,&nbsp;Zhikai Wang ,&nbsp;Renjie Huang ,&nbsp;Xiongliang Yao ,&nbsp;Naji Ma","doi":"10.1016/j.tws.2026.114485","DOIUrl":"10.1016/j.tws.2026.114485","url":null,"abstract":"<div><div>This study investigates the pressure characteristics of the inner wall surface and the evolution mechanism of the pressure reflection coefficient for stiffened thin-walled cylindrical shell structures subjected to complex fluid-structure interaction phenomena—including wall reflection, diffraction, and interference—under underwater explosion loads at medium interfaces. Based on material strain rate effects, the dynamic evolution mechanism of the wall pressure reflection coefficient is analyzed theoretically. Elastic deformation experiments were conducted to explore how different damage characteristics of the stiffened cylindrical shell structure influence the time-domain features of wall pressure and its reflection coefficient. To further investigate system parameter effects on wall pressure, numerical simulations were performed for cases with plastic small deformation and plastic indentation large deformation damage characteristics. The dynamic evolution laws of the wall pressure reflection coefficient at the explosion point were examined under varying load parameters. A semi-empirical formula for the wall pressure reflection coefficient was developed based on load parameters and structural characteristic parameters, revealing strong correlations between the reflection coefficient and the impact response of the stiffened cylindrical shell structure. The findings demonstrate that increased material strain rate enhances the reflection coefficient. For the studied structure at the explosion point with a detonator radius of 1.77<em>R</em>₀, the reflection coefficient <em>δ</em> ranges from approximately 1.3∼1.4 under small plastic deformation conditions and 1.4∼1.7 under large plastic indentation deformation conditions. Variations in the wall pressure reflection coefficient under different damage characteristics significantly affect the spatial characteristics of the impact response, providing a foundation for damage assessment and anti-impact protection design of stiffened cylindrical shell structures under underwater explosion loads.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114485"},"PeriodicalIF":6.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981767","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":"Stability criterion and parameter coupling effects of unilateral impact vibration in cantilevered fluid-conveying pipes","authors":"Tianlin Wang ,&nbsp;Feng Xu ,&nbsp;Changqing Guo ,&nbsp;He Liu","doi":"10.1016/j.tws.2026.114498","DOIUrl":"10.1016/j.tws.2026.114498","url":null,"abstract":"<div><div>In complex engineering environments such as marine engineering, mechanical and chemical engineering, and nuclear industry, the fluid-conveying pipe in service may experience parameter coupling impact vibration phenomena direct or spaced base excitation from earthquakes and waves. The strong nonlinear behavior significantly compromises the vibrational stability and operational safety/reliability of pipe systems. Therefore, a dynamic model for analyzing the impact vibration of unilaterally constrained cantilevered fluid-conveying pipes is established under base excitation by utilizing tension-compression anisotropic springs and the Euler-Bernoulli beam theory. Firstly, a novel amplitude stability criterion applicable to evaluating the nonlinear stability of cantilevered fluid-conveying pipes is proposed. Secondly, the results obtained by the new method were compared with experimental results, the simulation results of the high-stiffness spring system, and modal energy analysis, which verified the effectiveness of the amplitude stability criterion. Finally, the impact vibration stability of unilaterally constrained cantilevered pipes under parameter coupling effects is systematically investigated based on amplitude stability criterion and shows that co-existence region of flutter instability and divergence instability may appear and can be influenced by different parameters; the location of constraint can also greatly affect the critical flow velocity.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"222 ","pages":"Article 114498"},"PeriodicalIF":6.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981764","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":"Tailoring flexural strength and toughness of bio-inspired hybrid carbon/glass fiber laminates by controlling interlayer layup configurations","authors":"Linhai Huang ,&nbsp;Jin Sun ,&nbsp;Diantang Zhang ,&nbsp;Xinchao Gao ,&nbsp;Junpeng Li ,&nbsp;Junhua Zhao","doi":"10.1016/j.tws.2026.114635","DOIUrl":"10.1016/j.tws.2026.114635","url":null,"abstract":"<div><div>Interlayer layup configurations strongly dominate the mechanical properties of hybrid composite laminates. However, the influence of their structural parameters on the microscopic mechanical behavior and failure mechanisms remains unclear. To address this, we design a novel bio-inspired hybrid carbon/glass fiber laminate, where carbon fiber and glass fiber represent the hard and soft phases, respectively. The nonlinear mechanical behavior of 28 different layup types of hybrid carbon/glass fiber laminates is investigated through an integrated approach combining three-point bending tests and finite element analysis (FEA). Real-time monitoring of damage initiation and evolution is achieved using acoustic emission (AE) and digital image correlation (DIC), while a machine learning algorithm decodes AE features to classify damage modes. Corroborated by scanning electron microscopy (SEM), this multi-technique methodology systematically reveals the progressive damage behavior and failure mechanisms of the hybrid composites. Parametric analysis further elucidates the synergistic influence of dispersion degree and hybrid ratio, identifying the [G₃C₃]₂ laminate as the optimal configuration at a dispersion degree of 0.27 and a hybrid ratio of 0.5. Compared to the [C]₁₂ laminate, this design achieves a 32.78% higher flexural strength and a 45.82% greater energy absorption, yielding a superior comprehensive performance index of 0.77. This study establishes a bio-inspired hybrid strategy that provides a foundational framework for designing thin-walled composite structures with tailorable mechanical performance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"223 ","pages":"Article 114635"},"PeriodicalIF":6.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146190972","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}