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International journal of mechanics and materials in design
Springer Netherlands
International journal of mechanics and materials in design

Springer Netherlands

季刊

1569-1713

International journal of mechanics and materials in design/Journal International journal of mechanics and materials in designEISCI
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    Heterogeneous tailoring of stacked 2D structures with varying chirality

    Vijay Kumar ChoyalShaker MeguidShailesh Kundalwal
    445-461页
    查看更多>>摘要：Recent developments in stacking of weakly bonded van der Waals of atomically thin layers has the potential of fabricating nano-systems with desired properties. In this effort, we carried out comprehensive molecular dynamics simulations to study the mechanical behaviour of boron nitride layer, gra-phene layer, and their stacked configurations using modified Tersoff and Lennard-Jones force fields under varied conditions. We evaluated their mechanical properties for distinct chirality angles ranging from 0° to 30° directions. We found that the (ⅰ) armchair configuration of the nano-structure possesses higher elastic modulus, irrespective of the stacking sequence and the applied strain rate, and (ⅱ) elastic moduli of boron nitride AB-stacked configurations are higher than boron nitride monolayer. The effect of chirality angle was largely observed at higher strains. At lower strains, the effect of chirality angle is negligible for boron nitride/graphene heterogeneous structures. In this effort, we provide a comprehensive understanding of the mechanical properties of stacked configurations of boron nitride and graphene layers, accounting for the effect of chirality angle and strain rate for the design and development of the staking configurations of 2D nano-devices.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Nonlinear forced vibration and resonance analysis of composite rectangular sandwich plates with lattice cores

    Alireza MoradiAlireza Shaterzadeh
    463-506页
    查看更多>>摘要：This study introduces two entirely new lattice core models (models (a) and (c)), presenting their stiffness matrices for the first time, which serve as a foundation for future research. Additionally, it provides the first analytical assessment of the nonlinear forced vibration behavior of composite rectangular sandwich plates with various lattice core geometric patterns under uniform compressive loading. The plate consists of a central lattice core and symmetric homogeneous face plates. Using the first-order shear deformation theory, the partial differential equations of motion are derived via Hamilton's principle and von Karman's nonlinear strain-displacement relations. These equations are then reduced to time-dependent nonlinear ordinary differential equations using the Galerkin method. Primary and secondary resonances are analyzed using the method of multiple scales. The analytically obtained nonlinear primary resonances are validated against the Runge-Kutta numerical method, demonstrating excellent agreement. Secondary resonances, including superharmonic and subharmonic types that introduce new dynamic response frequencies as multiples or fractions of the primary frequencies, are also investigated. These resonances significantly influence the stability and dynamic performance of sandwich plates and play a key role in optimizing their design. This study further examines the effects of key parameters, including rib thickness, core height, and stiffener angles, on vibration amplitude and frequency response curves. The findings, validated through comparisons with existing literature and finite element analysis in ABAQUS, highlight the critical impact of these factors on dynamic behavior and provide valuable insights into design considerations for sandwich plates with lattice cores.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Bi-directional evolutionary topology optimization of geometrically nonlinear 3D continuum structures with an additional displacement constraint

    Yuanhang SiLahouari BenabouVincent Chalvet
    507-523页
    查看更多>>摘要：This paper addresses the volume minimization topology optimization problem for geometrically nonlinear structures with displacement constraint. Displacement constraints are essential in structural design, limiting specific parts of a structure from moving beyond a predefined boundary. To tackle this challenge, an enhanced bi-directional evolutionary structural optimization (BESO) method is proposed. The sensitivity information required for design updates is derived through the adjoint method. This approach leverages the linear perturbation function in ABAQUS, which eliminates the need to compute the inverse of the global tangential stiffness matrix, thereby significantly improving computational efficiency. Python is employed to manage the optimization process, while ABAQUS serves as the finite element solver. Numerical experiments demonstrate the effectiveness and accuracy of the method in optimizing complex 3D structures. The adaptive volume change algorithm stabilizes the optimization process by automatically adjusting volume changes, resulting in a smooth convergence to the optimal solution. Additionally, the method reduces displacement fluctuations by applying constraints on maximum volume addition rates and incorporating historical sensitivity data.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Aero-structural evaluation of kraft paper-reinforced composites for the manufacturing of UAV fuselages and wings using a numerical approach

    Cristian CruzattyMateo NarvaezEdwin AmaguanaEdgar Cando...
    525-546页
    查看更多>>摘要：Contemporary unmanned aerial vehicle (UAV) manufacturing methods are based on the use of composite materials for the fuselage, wings, and other structural components. Most of these methods rely on the use of carbon fiber in the form of foam or honeycomb core composites, or carbon fiber reinforced polymers. However, the high cost and limited accessibility of carbon fiber in certain regions hinder the advancement of aerospace research, development, and marketability in said localities, which could greatly benefit from the use of UAVs in different key areas such as precision agriculture, wildlife monitoring, and disaster management. This work evaluates a low cost, easily accessible, eco-friendly material that could serve as an alternative to carbon fiber as a reinforcement material in the outer panel composites used for UAV manufacturing. The composite material, which consists of Kraft paper laminates embedded in an epoxy resin matrix, was evaluated following standard test methods for tensile and flexural strength determination. The mechanical properties obtained from these tests were used to perform numerical analyses using a fluid-structure interaction framework simulating different operational conditions of a UAV wing. Through numerical simulation, the material was tested for different structural systems (foam core and semi-monocoque) to assess its performance as a construction material. The results show that, despite having a considerable difference in strength-to-weight ratios when compared to carbon fiber composites, Kraft-paper reinforced composites are able to perform well in missions of moderate structural demand.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Intelligent inverse design of phononic crystals based on machine learning coupled with localized collocation meshless method

    Wenhui ChuZhuojia FuS. S. NanthakumarWenzhi Xu...
    547-576页
    查看更多>>摘要：The development of phononic crystals provides a possible solution for the precise control of acoustic/elastic waves. Designing phononic crystals with a target characteristic has become a research hotspot in recent years. Nevertheless, the precision with which the acoustic and mechanical waves can be altered remains a major challenge for existing inverse design methods. The rapidly growing machine learning methods revolutionize the design of these materials. As an important branch of machine learning, reinforcement learning is being attempted to solve mechanical problems more intelligently through the interaction of environment and agent. In this paper, we adopt machine learning to successfully design 2D phononic crystals with expected band structure. We firstly applied the meshless generalized finite difference method in solving the dispersion equation for a periodic structure. Then, in order to widen the first-order bandgap width over a desired frequency range, we employ the reinforcement learning algorithm modified by particle swarm optimization to effectively estimate the shape parameters. The parallel technology saves computational costs remains independent of the initial state and target, in addition to being effective and stable. This improved reinforcement learning based interaction design scheme can easily accommodate several other reverse engineering problems.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Mechanics of functionally graded beams: analytical, computational, and experimental analyses

    Ugur OEzmenBozkurt Burak OEzhan
    577-590页
    查看更多>>摘要：Bending and vibration (modal) analyses of a functionally graded beam are proposed. Analytical, computational, and experimental results are obtained and compared. The functionally graded beam is modeled according to Euler- Bernoulli beam theory. The power-law rule is assumed to show the functional gradation of the beam. Displacement fields and energy expressions are given. Hamilton's principle is used to derive the equation of motion. Firstly, free vibration analysis of the functionally graded Euler-Bernoulli beam is investigated. Natural frequencies and mode shape expressions are analytically obtained for four support conditions. Secondly, a novel computational model is constructed using the finite element method based Ansys Workbench software. The new approach allows the simulation of exact continuous variation of material gradation. Finally, the experimental process is presented. The functionally graded beam is manufactured with 3-D printing technology using the additive manufacturing method. PETG/CF and PLA polymer materials are utilized to manufacture the test samples. Bending and vibration tests are done. The experimental results are compared with analytical and computational results. The effects of the power law index on the bending displacements and natural frequencies of the functionally graded beam are shown. The analytical and computational results are close to those of the experimental ones. Consistency of analytical computational and experimental results is proposed. The results show that the error percentages are very low compared to existing works.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Strut-based design optimization for improving mechanical properties of lattice structures

    Fatih Huzeyfe OEztuerkIsmail Aykut KaramanhAbdurrahim Temiz
    591-608页
    查看更多>>摘要：Polymer lattice structures, also known as polymeric cellular structures or polymeric foams, are widely used in various applications because of their unique properties, such as low density, high strength-to-weight ratio, and exceptional energy absorption. The objective of this work is to thoroughly examine the compression mechanical properties of strut-based truss constructions. As part of the study, these structures were created using an MSLA 3D printer, and both empirical and computational studies were conducted. Furthermore, the Taguchi method was employed for optimization purposes, and a thorough examination of statistical analyses was conducted. Lattice structures were developed using the Space-Claim program and produced using the Ancubic M3 MSLA technology, which employs additive manufacturing. The LS-Dyna module of ANSYS Workbench was employed to create the finite element model of the lattice structures, and the manufactured specimens were subjected to compression experiments under the same conditions. The novelty of this work lies in generating MSLA 3D printer strut-based truss structures using both experimental and numerical analysis. Results show that increasing the cell counts also increases the compressive strength and absorbed energy. Similarly, struts and additional supports, which act synergistically, reduce stress concentration and improve stress distribution. Hence, compressive strength and absorbed energy increase. While structures consisting of pyramidical cells can be preferred in constructions where construction weight is not a limiting factor, it is preferable to use regular lattice structures in constructions where construction weight is a limiting factor.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Elasto-dynamic analysis of a general orthotropic finite layer resting on flexible foundation under moving loads

    Jaber SadeghiShahriar J. Fariborz
    609-625页
    查看更多>>摘要：The vibration of a general orthotropic finite layer resting on the flexible foundation under transverse and shear point loads moving with a constant velocity on the layer boundary is studied. Structural energy dissipation in the layer and foundation and the foundation flexibility are modeled by viscous dampers and linearly distributed transverse and axial springs, respectively. Equations of motion for the analyses of slender and thick orthotropic layers resting on the flexible foundation are derived. The solution to these equations for orthotropic layers, with any elasticity boundary conditions at the ends, is accomplished by employing the integral transform and generalized differential quadrature methods. The effects of structural energy dissipation, the orientation of material principal axes of orthotropy, and load velocity on the stress and deflection fields of the layer are studied. Contrary to the conventional beam models, the elasticity solution considers the normal stress component in the thickness direction, resulting in a more accurate solution. In various beam theories equations defining displacement components in thickness direction should be assumed a priori, whereas using the elasticity theory the beam displacement field is a part of the solution. Moreover, the elasticity theory is capable of accurately analyzing thick beams.
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    • NETL
    • NSTL
    • Springer Nature

    Quasi-static crushing response analysis of a novel 3D double re-entrant auxetic metamaterial

    Chenfeng ChenWeikai XuHong HaiZheng Zhao...
    627-640页
    查看更多>>摘要：In a 2D negative Poisson's ratio (NPR) material, stretching (or compressing) in one direction results in expansion (or contraction) in the perpendicular direction, which limits its range of applications. Based on the 2D double re-entrant honeycomb (DRH) structure, this paper proposes three 3D DRH structures and derives the mechanical properties of these NPR structures. These 3D honeycomb structures are then fabricated using 3D printing technology, and their deformation behavior under uniaxial quasi-static loading is systematically investigated through experimental and simulation methods. By combining finite element analysis, experimental tests, and theoretical derivation, this study discusses the mechanical properties of the specimens, such as Poisson's ratio behavior in detail. Furthermore, the energy absorption capacities of several 3D structures under quasi-static loading are compared. The results show that the finite element simulations, theoretical predictions, and experimental findings are in good agreement, and the 3D DRH structure exhibits a more stable concave mechanism, a higher energy absorption range, and better specific energy absorption compared to the 2D DRH structure.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    Optimized strut-and-tie design for double-sided corbels using multi-material topology optimization under multiple load cases

    Rodrigo Reis AmaralHerbert Martins GomesJorge Luis Palomino Tamayo
    641-665页
    查看更多>>摘要：Designing structures often relies on the experience of engineers, involving an iterative process to achieve a balance between cost-effectiveness, durability, reliability, and to fulfill the required specifications. In this context, this paper introduces a novel multi-material topology optimization approach for reinforced concrete structures with D regions, considering multiple load cases during the optimization process. The methodology adopts a two-loop approach. The first loop minimizes the structure's compliance to reduce weight within a given material volume constraint. The second loop iteratively replaces concrete exceeding the Ottosen four-parameter failure surface by steel, ensuring a safe stress level under a stress constraint. The required steel area is determined based on the equivalent principal forces in finite elements classified as steel in the resulting topology from the multiple load cases. Finally, a nonlinear comparative analysis considering both material and geometric nonlinearity of the optimized and reference structures is performed using Simulia Abaqus. This analysis evaluates the crack pattern, stress distribution, and the yielding of the reinforcement up to the ultimate load of the structure. The outcomes demonstrate lightweight designs meeting the required structural performance standards.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature