Composite Structures最新文献

英文中文

Optimization of critical buckling load for variable stiffness composites using the lamination parameters as the field variables

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-13 DOI: 10.1016/j.compstruct.2025.118945

Eralp Demir , Ali Rashed

Buckling is a critical design concern for thin-walled structures and fiber-reinforced composite materials because it occurs with much lower strains than in failure. In this study, an in-house code is developed to optimize the critical buckling load using the lamination parameters as a design variable. The manufacturing steering curvature constraints are directly applied on the lamination parameters for the first time during optimization. The variable stiffness design revealed an approximately 160% improvement in the buckling load with respect to the optimal constant stiffness. The improvement in the critical buckling load ratio is over 400% with respect to the quasi-isotropic case, which is consistent with previous findings (Wu et al., 2015). The critical buckling load is 27% less when two opposite edges are clamped and two opposite edges are free compared to the ideal simply supported out-of-plane displacement boundary conditions that were used in previous optimization studies (Wu et al., 2015, Hao et al. 2019, Wu et al. 2012, Setoodeh et al. 2009, IJsselmuiden et al. 2010). The critical load ratio serves as the objective function when Neumann boundary conditions are employed, since membrane reactions remain unchanged throughout the optimization process, unlike in the case of Dirichlet boundary conditions. In addition, a widely accepted optimum fiber angle distribution, suggested in Gürdal et al. (2008), is implemented in a user-defined subroutine (UMAT) of Abaqus® to compare the buckling response of constant and variable stiffness of a plate.

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引用次数: 0

Aero-thermo-elastic stability analysis of supersonic variable stiffness sandwich panels using refined layerwise models

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-13 DOI: 10.1016/j.compstruct.2025.118920

J.A. Moreira , F. Moleiro , A.L. Araújo , A. Pagani

This work investigates the linear aero-thermo-elastic flutter and buckling stability of supersonic soft core sandwich panels with variable stiffness composite skins using refined layerwise finite element models based on shear deformation theories devoid of thickness stretching, as well as quasi-3D theories with thickness stretching involving Lagrange

z

-expansions. The proposed numerical applications of soft core sandwich panels, with either unidirectional or curvilinear fibres, highlight that the spatially varying fibre orientations, core thickness ratio and applied thermal loads significantly influence the aero-thermo-elastic response behaviour. Additionally, it is concluded that high-order layerwise models with thickness stretching are often crucial to properly capture the complex aeroelastic behaviour of thermally loaded sandwich panels experiencing flutter due to high-order modes. Nonetheless, the layerwise first-order shear deformation model ensures a fair compromise between numerical accuracy and computational efficiency when flutter arises in the first two modes.

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引用次数: 0

Inverse design of a petal-shaped honeycomb with zero Poisson’s ratio and bi-directional tunable mechanical properties

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-13 DOI: 10.1016/j.compstruct.2025.118967

Ze-Yu Chang , Hai-Tao Liu , Guang-Bin Cai , Dong Zhen

Zero Poisson’s ratio (ZPR) honeycombs are widely used in aerospace applications due to their high load carrying capacity, tunable performance and lightweight. However, its structural design is difficult and often requires designers to have extensive experience. With the gradual development of artificial intelligence, it becomes possible to obtain structural configurations using meta-models and desired mechanical properties. In this paper, a petal-shaped honeycomb (PSH) with bi-directional tunable mechanical properties possessing ZPR effect is designed. Parametric modelling and Latin hypercube sampling (LHS) are applied to reveal the effect of structural parameters on the bi-directional mechanical properties. Combined with Python scripts to automate the running of finite element analyses and complete the collection of results. An artificial neural network (ANN) is improved to achieve the performance prediction of the PSH with a minimum error of only 0.032%. The inverse design of the PSH is completed based on the mechanical properties required for the conceptual application with a minimum error of 2.375%. An automatic design system for PSH is proposed by integrating parametric models, Python scripts and modified ANN. The overall process reduces human control time through the automation of scripts, improves the honeycomb design efficiency, and provides a new systematic approach for the design of ZPR honeycombs.

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引用次数: 0

Hierarchical multiscale fracture modeling of carbon-nitride nanosheet reinforced composites by combining cohesive phase-field and molecular dynamics

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-13 DOI: 10.1016/j.compstruct.2025.118942

Qinghua Zhang , Navid Valizadeh , Mingpeng Liu , Xiaoying Zhuang , Bohayra Mortazavi

Understanding the fracture mechanisms in composite materials across scales, from nano- to micro-scales, is essential for an indepth understanding of the reinforcement mechanisms and designing the next generation of lightweight, high-strength composites. However, conventional methods struggle to model the complex fracture behavior of nanocomposites, particularly at the fiber–matrix interface. The phase-field regularized cohesive fracture model has proven to be effective in simulating crack initiation, branching, and propagation; however, capturing the cohesive fracture strength at smaller scales remains a significant challenge. This study introduces a novel approach that combines an energy-based star-convex decomposition cohesive phase-field fracture model with molecular dynamic simulations to explore the thickness dependency of nanocomposite mechanical properties. The proposed framework enables hierarchical modeling of the mechanical and fracture behaviors of carbon-nitride nanosheet-reinforced composites. The developed model could reveal complex fracture processes across different scales and highlight critical scaling effects. This methodology provides an efficient solution for uncovering hierarchical fracture mechanisms in reinforced nanocomposites, offering valuable insights into their fracture behavior and strengthening mechanisms.

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引用次数: 0

Free vibration behaviour of curved Miura-folded bio-inspired helicoidal laminated composite cylindrical shells using HSDT assisted by machine learning-based IGA 使用基于机器学习的 IGA 辅助 HSDT，研究曲面三浦折叠生物启发螺旋形层压复合圆柱壳的自由振动特性

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-12 DOI: 10.1016/j.compstruct.2025.118933

Aman Garg , Weiguang Zheng , Mehmet Avcar , Mohamed-Ouejdi Belarbi , Raj Kiran , Li Li , Roshan Raman

Deployable structures, which can be compacted into small spaces and later deployed into their desired configurations, have gained significant attention due to their versatility. Origami-inspired structures, in particular, leverage the principles of origami to achieve compactness and deploy ability. This study focuses on predicting the free vibration behaviour of Miura-folded laminated composite cylindrical shells, which are modelled using bio-inspired helicoidal schemes. The analysis is conducted through isogeometric analysis (IGA) based on higher-order shear deformation theory (HSDT). A Gaussian Process Regression (GPR) machine learning surrogate is employed to predict the IGA parameters, specifically the knot vectors, which are used to accurately model the geometry of the shells. The performance of the proposed approach is validated by comparing the results with those obtained without the surrogate model. The findings of this study serve as a benchmark for future research on the free vibration behaviour of origami-inspired cylindrical shells and highlight the potential of using machine learning surrogates in structural analysis.

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引用次数: 0

A novel micro-mechanical model for continuous carbon fiber-reinforced composites: Effect of fiber surface roughness on mechanical behaviors 连续碳纤维增强复合材料的新型微观力学模型：纤维表面粗糙度对力学行为的影响

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-11 DOI: 10.1016/j.compstruct.2025.118960

Heng Cai , Jiale Xi , Yuan Chen , Lin Ye

The fiber surface roughness determines the interface contact between carbon fiber and resin of composites, and its effect is crucial to be investigated. This study develops a micro-mechanical model considering the surface morphology of carbon fibers to examine the impact of microscopic geometric features on the macroscopic mechanical behaviors of composites. The morphological characteristics of the carbon fiber surface were well captured through image processing based on the microscopically scanned images of fiber cross-sections to determine the average depth-to-width ratio of grooves on the fiber surface. Further, based on statistical analysis, the proposed model considering surface roughness of carbon fibers were developed to evaluate the effective mechanical properties of composites. Then, both the experimental and theoretical results demonstrated that the proposed model exhibits a 3 % reduction in the relative error for predicting the transverse modulus when compared to the standard model indicating a minimal effect of surface roughness on the mechanical responses in this case. However, further numerical analyses using an average depth-to-width ratio twice that of the initial proposed model revealed a 4.18 % increase in the transverse elastic modulus. By calculation, the transverse tensile strength was 39.43 MPa when using the proposed model, demonstrating an increment of 5.1 % in strength when compared to that using the standard model.

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引用次数: 0

Accounting for material strength in the thrust line analyses of unstrengthened and strengthened arches

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-11 DOI: 10.1016/j.compstruct.2025.118926

Davide Pellecchia, Francesco Marmo, Luciano Rosati

This paper presents a methodology, based on Heyman’s safe theorem of limit analysis for masonry structures, to allow for the design and analysis of arches both unstrengthened and strengthened with composite materials. More specifically, we propose an extension of the Thrust Line Analysis to account for the expansion or contraction of the geometric domain of the thrust line able to include the effects of the limited compressive strength of masonry as well as the tensile strength and the delamination ruptures of the composite material.

The influence of each one of these issues on the size of the admissible domain, evaluated iteratively as a function of the internal forces, is numerically investigated and discussed.

本文提出了一种基于海曼砌体结构极限分析安全定理的方法，用于设计和分析未加固和使用复合材料加固的拱。更具体地说，我们建议对推力线分析进行扩展，以考虑推力线几何域的扩展或收缩，并将砌体的有限抗压强度以及复合材料的抗拉强度和分层断裂的影响包括在内。我们通过数值方法研究和讨论了这些问题中的每一个对可接受域大小的影响，并将其作为内力的函数进行迭代评估。

引用次数: 0

A semi-analytical method for non-linear instability analysis of variable stiffness laminated composite beams under thermo-mechanical loading

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-11 DOI: 10.1016/j.compstruct.2025.118966

Satyajeet Dash , Tanish Dey , Ayan Haldar , Rajesh Kumar

This investigation explores the non-linear instability phenomena of variable stiffness laminated composite (VSLC) beams subjected to thermo-mechanical loading. A semi-analytical model is developed to determine the post-buckling and post-buckled vibration behavior of VSLC beams based on trigonometric shear deformation theory. Non-linear strain equations are formulated based on von-Karman’s geometric non-linearity assumptions. Constitutive relations are modified for VSLC beam to account for various coupling effects that arise due to varying fiber orientation and Poisson effects that arise due to the development of zero-stress conditions in the width direction of beams. Using Gram-Schmidt orthogonalization process, an orthogonal basis for the displacement field is constructed to enhance accuracy and ease. The model employs a displacement-based Ritz approach to derive the matrix representation of the governing equations. The present model is developed assuming equivalent single-layer theory, and material properties and temperature variations are assumed to be constant across the thickness of the beam. Moreover, arc-length method is employed to obtain the non-linear response curves of VSLC beam. Pre-buckled and post-buckled vibration responses are obtained using a standard eigenvalue approach. A parametric analysis is conducted to investigate the effect of slenderness ratio, boundary conditions, and ply-sequence on post-buckling and post-buckled vibration characteristics of VSLC beam.

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引用次数: 0

A novel finite element-assisted approach for damage detection in composite sandwich panels under cyclic loading using thermography 利用热成像技术检测循环载荷下复合材料夹芯板损伤的新型有限元辅助方法

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-11 DOI: 10.1016/j.compstruct.2025.118965

Seyed Sina Samareh-Mousavi, Xiao Chen

This study develops a novel finite element simulation framework to facilitate thermography-based damage identification in fiber/polymer composite sandwich panels with foam cores under constant amplitude cyclic load. The finite element model predicts surface temperature contours induced by self-heating. The heat generation rate in material points is calculated from viscoelastic energy dissipation in a loading cycle, and the steady-state temperature distribution is predicted by performing a heat transfer analysis. Sandwich panel specimens made of glass/epoxy composite skins and PVC foam core are tested under cyclic load before and after introducing artificial damages with the shape of circular notches. The proposed method identifies the artificially introduced damages as well as fatigue damage initiated in the composite sandwich panels based on temperature contour predictions.

引用次数: 0

Multi-physics simulation of adhesives for structural joints in hygrothermal environments considering mechanical degradation

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures

Pub Date : 2025-02-10 DOI: 10.1016/j.compstruct.2025.118928

Yilin Wang , Antonio Cibelli , Jan Vorel , Philipp Siedlaczek , Jan Belis , Helga C. Lichtenegger , Roman Wan-Wendner

Adhesive joints are increasingly utilized to address structural challenges by overcoming non-uniform stress transfer and stress concentration common in mechanical joint systems. For hybrid Fiber Reinforced Polymer (FRP)/concrete systems, interfacial bond strength is governed by adhesive joints, which are highly sensitive to environmental factors like moisture and temperature. Moisture ingress, from the surrounding environment and from concrete, can induce hydrolytic degradation, significantly altering the mechanical properties of the adhesive. To address these issues, a nonlinear Finite Element Method (FEM)-based model has been developed, coupling moisture diffusion with a mechanical degradation model for thermoset polymers. This multi-physics framework is able to capture moisture exchange between adhesive, concrete, and the environment, predicting the performance of bulk adhesive under hygrothermal conditions. Calibration and validation were performed using experimental data from bulk adhesive samples. A parametric study on the diffusion model was performed to discuss the influence of the model parameters on the mechanical behavior of bulk adhesive. Furthermore, predictive proof-of concept simulations were conducted, including its application to two representative single-lap shear tests: steel-steel system and FRP-concrete system. This case study aids in evaluating and understanding the fundamental mechanisms of moisture diffusion and mechanical degradation in structural joints.

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