Article
Engineering, Civil
Mandana Abbasi, Kim J. R. Rasmussen, Mani Khezri, Benjamin W. Schafer
Summary: This paper presents a reliable and detailed finite-element model for analyzing the collapse behavior of cold-formed steel columns with discrete fastener connections. The computational model and its options are discussed, and the chosen options are justified. The proposed model is verified against experimental data and utilized to study various design parameters' effects on the ultimate strength of the columns.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Mohammad Alhawamdeh, Omar Alajarmeh, Thiru Aravinthan, Tristan Shelley, Peter Schubel, Ali Mohammad, Xuesen Zeng
Summary: This paper proposes a design tool that combines experimental and numerical methods to investigate the failure modes of hollow PFRP profiles under four-point bending. The validated finite element model was used to thoroughly study the failure sequence and conduct a comprehensive parametric study on design parameters.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Jichong Wang, Xiongqi Peng, Zhigao Huang, Huaming Zhou
Summary: A temperature-dependent 3D anisotropic visco-hyperelastic constitutive model was developed for jute woven fabric reinforced PBS biocomposites, considering the temperature influence on the interaction between fabric reinforcement and PBS matrix. Finite element simulation of thermoforming process validated the proposed model.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Duc Hong Doan, Thom Van Do, Nguyen Xuan Nguyen, Pham Van Vinh, Nguyen Thoi Trung
Summary: The phase-field theory is a well-known mathematical model for solving interface problems, including crack problems in fracture mechanics. In this study, the formula is derived and simulated to capture the crack behavior of each ply in laminated composite plates with buckling phenomenon. The research focuses on laminated composite plates with cracks in each layer.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Computer Science, Interdisciplinary Applications
Brian B. Sheil, Byron W. Byrne, Christopher M. Martin
Summary: This study investigates the uplift behavior of a pipe segment in modified Cam clay soil, focusing on the role of rate effects on pipe uplift capacity. The results indicate a significant impact of loading rate on peak uplift resistances and suggest that excess pore pressures may not be a reliable indicator of overall response behavior. A new approach for predicting pipe uplift capacity as a function of loading rate is proposed as an alternative to current design guidelines.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Luigi Di Sarno, Francesco Pugliese, Raffaele De Risi
Summary: This paper presents an optimization methodology for simulating the monotonic and cyclic response of steel reinforcement smooth bars subjected to inelastic buckling, by comparing experimental tests with numerical results to optimize material constitutive model parameters and proposing new empirical relationships and probabilistic distributions. Additionally, an improvement of an existing analytical model for inelastic buckling of smooth steel rebars is proposed through GA-based and Bayesian-based calibration methods.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Mohammad Asad, Tatheer Zahra, Julian Thamboo, Mengli Song
Summary: This paper presents the development of a 3D finite element technique for modeling and analyzing reinforced masonry walls under axial compression. The technique accurately captures the nonlinear response of both the embedded steel and the masonry wall. Experimental data was used to verify the accuracy of the model, and the model was further used to predict the behavior of taller masonry walls. The potential of using masonry walls for taller structures is discussed.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
Mohammad Alhawamdeh, Omar Alajarmeh, Thiru Aravinthan, Tristan Shelley, Peter Schubel, Michael Kemp, Xuesen Zeng
Summary: This paper presents a numerical study on the local buckling and compressive failure of hollow PFRP profiles under axial compression, using the Newton method and adaptive stabilisation scheme in Abaqus 2019. The numerical predictions were validated by experiments. The energy parameters and constituent failure modes were used to explain the effects of dimension, layup, and slenderness ratio on the post-peak behavior and failure modes of the PFRP profiles.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Zhaoyu Xu, Genshu Tong, Lei Zhang, Yong Guo
Summary: This study investigates the buckling behavior and design of aluminium alloy single-angle members connected by one leg. Buckling tests and finite element models were used to assess the reduction in buckling resistance caused by the single-side connection. Existing design rules for steel single-angle members were found to be unsuitable for aluminium alloy members, especially for those undergoing torsional-flexural buckling in axial compression. New design equations were proposed and shown to accurately predict the reduction in buckling resistance.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Yanfei Yang, Wanwan Cao, Zihu Wang, Ji Li, Yan Zhang
Summary: This study investigates the mechanical properties and ballistic performance of fabric pre-pregs after resin coating. Different resin ratios were used to coat aramid fabric and obtain various fabric pre-pregs. Experimental tests and Finite Element (FE) simulations were conducted to understand the role of resin coating. The results show that higher bonding force in the yarns led to global deformation under load, while local failure and limited Backface Signature (BFS) were observed during ballistic impact. An increase in resin ratio initially increased the tensile stress and energy absorption of the fabric pre-pregs, but later decreased. The panel AF/R14 showed the highest improvement in tensile stress (16.28%) and specific energy absorption (21.5%) compared to the neat fabric panel. FE simulation results revealed higher strain energy and frictional energy dissipation in the AF/R14 panel before failure. When the fabric pre-preg had appropriate bonding force, the secondary yarns contributed significantly to energy absorption during impact. Resin coating on fabric can enhance ballistic performance.
COMPOSITE STRUCTURES
(2023)
Article
Thermodynamics
Biao Liang, Zizhao Zhao, Hui Cheng, Philippe Boisse, Kaifu Zhang, Bin Luo
Summary: In this study, a method combining virtual deformation modeling and multiscale thermal homogenization was proposed to analyze the evolution of macro effective thermal conductivity of satin weave thermoset prepregs during preforming. The effectiveness of the method was demonstrated through comparing the predicted results with thermal experiments.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Mechanics
Weizhu Zhou, Weidong Zhu, Qiang Xu, Yinglin Ke
Summary: This study investigates the effect of voids on the damage mechanism of composite materials under out-of-plane tensile load with different lay-up temperature conditions. By establishing micro and macro models, experimental and numerical analyses show that increasing lay-up temperature leads to changes in the types and distribution of voids, resulting in a decrease in the out-of-plane tensile strength of the composite.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Francisco J. Meza, Jurgen Becque
Summary: This paper focuses on the stability behavior of built-up cold-formed steel structural members, demonstrating that accurate finite element models are essential for deeper understanding. It investigates the complexities of modeling connectors and contact between constituent parts, proposing alternative techniques and strategies to overcome convergence problems. The inclusion of contact has limited impact on predicted capacity and connector spacing has minimal effect within the practical range.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Jun-zhi Liu, Shuxian Chen, Tak-Ming Chan
Summary: This paper presents a comprehensive study on the material properties and behavior of Q690 high strength steel welded T-sections. Experimental tests and numerical models were used to evaluate the cross-section slenderness limits and local buckling design provisions in different design codes. The results indicate that the current limits are generally accurate and safe, with EN 1993-1-12 and ANSI/AISC 360-16 providing more precise predictions compared to AS 4100, DSM, and CSM.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Manufacturing
A. Marchandise, V. Keryvin, Y. Grohens, R. Le Borgne
Summary: This study investigates the influence of the lay-up and curing steps in the manufacturing process of CFRP on compressive strength. It compares Automated Fibre Placement (AFP) and manual lay-up (HLU), as well as the use of porous or non-porous consumables during curing. The results show that using non-porous consumables may result in heterogeneous mesostructures with gradients in fibre volume content. Experimental results suggest that AFP plates outperform HLU plates, especially in terms of reproducibility.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Civil
S. G. P. Castro, E. L. Jansen
Summary: The study presents Koiter's asymptotic method for calculating and understanding the initial post-buckling behavior of thin-walled structures, with a focus on multi-modal analysis. The implementation uses state-of-the-art collaborative tools and specialized kinematic relations for accurate representation of displacement fields. Results are verified against established literature, and multi-modal displacement fields with up to 5 modes and corresponding post-buckling factors are reported for future reference.
THIN-WALLED STRUCTURES
(2021)
Article
Energy & Fuels
Amrit Shankar Verma, Zhiyu Jiang, Zhengru Ren, Marco Caboni, Hans Verhoef, Harald van der Mijle-Meijer, Saullo G. P. Castro, Julie J. E. Teuwen
Summary: Rain-induced leading-edge erosion (LEE) of wind turbine blades can affect turbines at different sites at varying rates, with erosion affected by site and turbine specifications. A framework for assessing the lifetime of WTB coating systems and analyzing 31 sites in the Netherlands was proposed in this study, which will help in developing efficient operation and maintenance strategies for wind farms.
Article
Mechanics
L. Vertonghen, S. G. P. Castro
Summary: Previous research has suggested that incorporating overlaps in variable-stiffness laminates can further improve buckling behavior. This study compares two modeling strategies for considering variable thickness distribution: discrete thicknesses and continuous thickness distribution. By utilizing virtually manufactured laminates and a smoothed manufacturing mold, the study examines the effects of variable thickness on buckling analyses.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Saullo G. P. Castro, Jose Humberto S. Almeida, Luc St-Pierre, Zhihua Wang
Summary: This study proposes a novel method for measuring geometric imperfections in cylindrical shells, which is simple and applicable to structures of all sizes. The use of digital image correlation and best-fit routines transforms raw data into a 3D imperfection pattern for nonlinear finite element analysis.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Jose Humberto S. Almeida, Luc St-Pierre, Zhihua Wang, Marcelo L. Ribeiro, Volnei Tita, Sandro C. Amico, Saullo G. P. Castro
Summary: This work demonstrates the potential of manufacturing variable-angle composite cylinders using filament winding. The approach allows different filament angles along the axial direction by dividing the cylinder into regions of constant angle. The VAFW design shows significantly higher buckling strength, stiffness, and absorbed energy compared to the constant-angle configuration.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Javier Alba-Maestre, Koen Prud'homme van Reine, Tomas Sinnige, Saullo G. P. Castro
Summary: Novel eVTOL aircraft configurations are gaining popularity in the urban air mobility market, featuring electrical power systems and distributed propulsion architectures. This paper presents a preliminary design methodology for open rotor eVTOL configurations with batteries as the power source, focusing on a design range of 400 km and a capacity of five occupants. The proposed design methodology allows for early-stage numerical simulations and accurate estimates for the power system mass, improving overall mass estimates for the analyzed configuration.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Zhihua Wang, Jose Humberto S. Almeida, Aravind Ashok, Zhonglai Wang, Saullo G. P. Castro
Summary: In this study, variable-angle filament-wound (VAFW) cylinders were optimized for minimum mass under manufacturing constraints and various design loads using particle swarm optimization and Kriging-based metamodels. The nonlinear relationship between the tow winding angle and thickness in VAFW structures was explored using a design parameterization based on a second-order polynomial variation. A Bogner-Fox-Schmit-Castro finite element was used to accurately represent the variable stiffness properties of the shells. The analysis of the design space using metamodels revealed a gap in the buckling strength, which was confirmed through genetic algorithm optimizations. Extreme lightweight and buckling-resistant designs were achieved along with non-conventional optimum layouts thanks to the tailored thickness buildup.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Polymer Science
Saeid Saberi, Alireza Sadat Hosseini, Fatemeh Yazdanifar, Saullo G. P. Castro
Summary: This paper proposes a new methodology combining the Finite Element Method (FEM) and Multi-Objective Genetic Programming (MOGP) for the analysis of bistable composite structures. The results show the reliability and accuracy of this method.
Article
Chemistry, Physical
Rogerio R. dos Santos, Saullo G. P. Castro
Summary: This study investigates the application of continuous tow shearing (CTS) in lightweight, cylindrical shell designs to reduce imperfection sensitivity. Machine learning methods, namely Support Vector Machine, Kriging, and Random Forest, are compared to optimize the design. The proposed ML-based framework solves the inverse problem and provides lightweight designs with reduced imperfection sensitivity.
Article
Acoustics
Felipe Franzoni, Adrian Gliszczynski, Theodor Dan Baciu, Mariano Andres Arbelo, Richard Degenhardt
Summary: This study investigates the application of the vibration correlation technique to determine the in-situ buckling load of unstiffened and skin-dominated stiffened cylindrical shells. The study proposes the use of a load factor to enhance the buckling load estimations based on validated finite element models and numerical results. Experimental results are also reevaluated to assess the impact of the load factor on the buckling load predictions.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Civil
Theodor D. Baciu, Richard Degenhardt, Felipe Franzoni, Adrian Gliszczynski, Mariano A. Arbelo, Saullo G. P. Castro, Kaspars Kalnins
Summary: The Vibration Correlation Technique (VCT) is a non-destructive method used to predict buckling loads for imperfection-sensitive structures. The sensitivity of VCT predictions to the number of load steps and the maximum load level is studied, along with an uncertainty quantification of the measured frequency affecting the VCT prediction.
THIN-WALLED STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Sian Ying Chen, Wydo Van de Waerdt, Saullo G. P. Castro
Summary: This study investigates the dynamic load path and contribution of each structural element in the bird strike resistance of the Flying-V aircraft's leading-edge structures. The aim is to propose a modular design approach that complies with EASA's certification requirements and ensures elastic deformation during impact to avoid repairs. The results show that adjusting the thickness of structural elements significantly reduces plastic energy.
Article
Chemistry, Physical
Saeid Saberi, Hamid Nasiri, Omid Ghorbani, Michael I. I. Friswell, Saullo G. P. Castro
Summary: In this study, the influence of material properties, geometrical dimensions, and environmental conditions on the characteristics of bistable composite laminates is investigated using the SHAP approach. The SHAP method is employed to explain the contribution and importance of input features on curvatures and snap-through force. The results highlight the significant impact of the transverse thermal expansion coefficient and moisture variation on the model's output for curvatures and snap-through force.
Article
Materials Science, Composites
Raphael Ummels, Saullo G. P. Castro
Summary: Recent research has shown that further improvement on buckling performance is possible by incorporating overlaps in laminate designs. The proposed method naturally copes with minimum steering radius constraints of different manufacturing processes, and the study focuses on two tow-steering processes.
COMPOSITES PART C: OPEN ACCESS
(2021)
Article
Engineering, Aerospace
Rogerio Rodrigues dos Santos, Tulio Gomes de Paula Machado, Saullo Giovani Pereira Castro
Summary: This study proposes a workflow for optimal design of laminated composite stiffened panels using design of experiments, metamodeling, and optimization phases, with machine learning strategy and multi-objective formulation. The deterministic algorithm choice accelerates convergence towards optimal design, achieving a balance between exploring new design regions and refining optimal design. Numerical experiments demonstrate the viability of the proposed methodology for a representative upper skin wing panel design.
