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Design and sound absorption analysis of labyrinthine acoustic metamaterials based on fractal theory 基于分形理论的迷宫式声学超材料的设计与吸声分析
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-28 DOI: 10.1016/j.ijsolstr.2024.113121
DongXing Cao , LiMing Wang , JunRu Wang , XiangYing Guo , HaiTao Li
Acoustic metamaterials exhibit exceptional sound absorption capabilities. This study introduces a fractal labyrinthine acoustic metamaterial (FLAM) designed for sound absorption analyses in a low-frequency range of 1–2000 Hz. The fractal curve is constructed through side substitution on an isosceles right triangle, which is chosen as the spatial recursive substructure due to its self-similarity. The FLAM model is then developed. With the thermal viscous losses considered in narrow channels, the sound absorption coefficient of this model is theoretically analyzed as the structural parameters significantly affect the sound absorption. A comprehensive analysis of low-frequency sound absorption performance is conducted for the first three orders, and the reconstruction of the structure with different combinations of fractal orders is examined to optimize the FLAM. The results show that the proposed FLAM achieves nearly perfect absorption in the 50–400 Hz range, with peak absorption coefficients of 0.99, 0.95, and 0.95 for the first three orders. The proposed FLAMs for the first three orders have total thicknesses of 0.032λ, 0.021λ, and 0.019λ, demonstrating excellent low-frequency sound absorption at deep sub-wavelength scales.
声超材料具有卓越的吸声能力。本研究介绍了一种分形迷宫式声学超材料(FLAM),设计用于 1-2000 Hz 低频范围内的吸声分析。分形曲线是通过对等腰直角三角形进行边置换而构建的,由于其自相似性,我们选择等腰直角三角形作为空间递归子结构。然后建立 FLAM 模型。考虑到窄通道中的热粘性损失,对该模型的吸声系数进行了理论分析,因为结构参数对吸声有显著影响。对前三阶的低频吸声性能进行了综合分析,并研究了不同分形阶数组合的结构重构,以优化 FLAM。结果表明,所提出的 FLAM 在 50-400 Hz 范围内实现了近乎完美的吸声效果,前三阶的吸声系数峰值分别为 0.99、0.95 和 0.95。所提出的前三阶 FLAM 的总厚度分别为 0.032λ、0.021λ 和 0.019λ,显示了在深亚波长尺度上出色的低频吸声性能。
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引用次数: 0
Metabarriers for mitigating traffic-induced surface waves: Mechanism dependence on buried arrangements 用于减缓交通引起的表面波的元载体:机制取决于埋设方式
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-28 DOI: 10.1016/j.ijsolstr.2024.113120
Yifei Xu , Haoran Lu , Zhigang Cao , Songye Zhu
Locally resonant metamaterials provide exceptional wave manipulation capabilities in the low-frequency regime. This study introduces a buried metabarrier, which can simultaneously harness both resonant and geometric scatterings, to attenuate surface Rayleigh waves at both low and high frequencies induced by traffic. In particular, how the buried arrangements of metabarriers influence their resonant- and geometric-scattering mechanisms is investigated by considering the metabarrier units buried vertically and horizontally in the ground. To this purpose, a numerical finite element model, which is verified through comparisons with existing studies, is developed to analyze the attenuation performance of the metabarrier. Using this model, we perform parametric studies to examine the effects of the material properties and dimensions of the metabarriers on their attenuation behavior. Due to resonant scattering, low-frequency Rayleigh waves are mainly reflected by the vertical metabarriers; in contrast, they are predominantly converted into refracted bulk waves by the horizontal metabarriers. Additionally, the geometric scattering of horizontal metabarriers yields Bragg effects, which can reflect more high-frequency Rayleigh waves and induce a partial mode conversion to transverse bulk waves. Our systematic investigations will, to some extent, facilitate the future design of a well-performing metabarrier attenuating broadband Rayleigh waves.
局部谐振超材料在低频领域具有卓越的波操纵能力。本研究介绍了一种埋入式超材料,它可以同时利用谐振和几何散射来衰减交通诱发的低频和高频表面瑞利波。特别是,通过考虑垂直和水平埋入地下的元屏障单元,研究了元屏障的埋入布置如何影响其共振和几何散射机制。为此,我们开发了一个有限元数值模型来分析元屏障的衰减性能,并通过与现有研究的比较进行了验证。利用该模型,我们进行了参数研究,以检验元壁垒的材料特性和尺寸对其衰减行为的影响。由于共振散射,低频瑞利波主要被垂直元屏障反射;相反,它们主要被水平元屏障转化为折射体波。此外,水平元载波的几何散射会产生布拉格效应,从而反射更多的高频瑞利波,并诱导部分模式转换为横向体波。我们的系统研究将在一定程度上促进未来设计性能良好的元载波,以衰减宽带瑞利波。
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引用次数: 0
Mixed-mode fracture prediction of notched components using phase-field approach 利用相场方法预测缺口部件的混合模式断裂
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-26 DOI: 10.1016/j.ijsolstr.2024.113113
Bahador Bahrami, Hossein Ahmadian, Mohammad R. Mehraban, Majid R. Ayatollahi
The application of the phase-field method (PFM) to brittle fracture for studying complex fracture phenomena has recently gained attention from researchers. However, there has been limited emphasis on predicting fracture loads for notched components. In this study, numerous phase-field simulations were conducted to compute the fracture load and crack initiation angle in brittle notched components under in-plane loading conditions. The accuracy of the results, verified against experimental data, demonstrates the PFM’s ability to precisely predict both fracture load and fracture initiation angle. Additionally, it has been demonstrated that Miehe’s spectral decomposition method provides more reliable results for notched Brazilian Disc specimens subjected to compressive loading than those obtained using Amor’s volumetric-deviatoric split method.
将相场法(PFM)应用于脆性断裂以研究复杂的断裂现象最近受到了研究人员的关注。然而,人们对缺口部件断裂载荷预测的重视还很有限。在本研究中,我们进行了大量相场模拟,以计算平面加载条件下脆性缺口部件的断裂载荷和裂纹起始角。根据实验数据验证的结果的准确性表明,相场模拟法能够精确预测断裂载荷和断裂起始角。此外,研究还证明,对于承受压缩载荷的缺口巴西圆盘试样,Miehe 的频谱分解法比 Amor 的体积-偏差分割法得出的结果更可靠。
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引用次数: 0
Adaptively remeshed multiphysical modeling of resistance forge welding with experimental validation of residual stress fields and measurement processes 通过残余应力场和测量过程的实验验证,自适应重塑电阻锻造焊接的多物理模型
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-24 DOI: 10.1016/j.ijsolstr.2024.113112
Andrew J. Stershic , Christopher R. D’Elia , Lauren L. Beghini , Michael R. Hill , Bjørn Clausen , Dorian K. Balch , Michael Maguire , Christopher W. San Marchi , James W. Foulk III , Alexander A. Hanson , Kevin L. Manktelow
Welding processes used in the production of pressure vessels impart residual stresses in the manufactured component. Computational modeling is critical to predicting these residual stress fields and understanding how they interact with notches and flaws to impact pressure vessel durability. In this work, we present a finite element model for a resistance forge weld and validate it using laboratory measurements. Extensive microstructural changes, near-melt temperatures, and large localized deformations along the weld interface pose significant challenges to Lagrangian finite element modeling. The proposed modeling approach overcomes these roadblocks in order to provide a high-fidelity simulation that can predict the residual stress state in the manufactured pressure vessel; a rich microstructural constitutive model accounts for material recrystallization dynamics, a frictional-to-tied contact model is coordinated with the constitutive model to represent interfacial bonding, and adaptive remeshing is employed to alleviate severe mesh distortion. An interrupted-weld approach is applied to the simulation to facilitate comparison to displacement measures. Several techniques are employed for residual stress measurement in order to validate the finite element model: neutron diffraction, the contour method, and the slitting method. Model-measurement comparisons are supplemented with detailed simulations that reflect the configurations of the residual-stress measurement processes themselves. The model results show general agreement with experimental measurements, and we observe some similarities in the features around the weld region. Factors that contribute to model-measurement differences are identified. Finally, we conclude with some discussion of the model development and residual stress measurement strategies, including how to best leverage the efforts put forth here for other weld problems.
压力容器生产过程中使用的焊接工艺会在制造部件中产生残余应力。计算建模对于预测这些残余应力场以及了解它们如何与缺口和缺陷相互作用以影响压力容器的耐久性至关重要。在这项工作中,我们提出了电阻锻造焊缝的有限元模型,并通过实验室测量进行了验证。广泛的微观结构变化、近熔温度和沿焊接界面的大局部变形给拉格朗日有限元建模带来了巨大挑战。所提出的建模方法克服了这些障碍,从而提供了可预测制造压力容器残余应力状态的高保真模拟;丰富的微观结构组成模型考虑了材料的再结晶动力学,摩擦-绑定接触模型与组成模型协调以表示界面结合,并采用自适应重网格化以减轻严重的网格畸变。模拟中采用了间断焊接方法,以便于与位移测量结果进行比较。为了验证有限元模型,采用了多种残余应力测量技术:中子衍射法、等值线法和切分法。模型与测量结果的比较还辅以详细的模拟,以反映残余应力测量过程本身的配置。模型结果与实验测量结果基本一致,我们还观察到焊接区域周围的一些相似特征。我们找出了造成模型与测量结果差异的因素。最后,我们对模型开发和残余应力测量策略进行了一些讨论,包括如何在其他焊接问题上更好地利用本文提出的方法。
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引用次数: 0
An investigation of rapid surface melting in nanowires 纳米线表面快速熔化的研究
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-23 DOI: 10.1016/j.ijsolstr.2024.113106
Benhour Amirian, Kaan Inal
The investigation into virtual melting phenomena in nanowires holds significant relevance owing to its profound impact on material durability under extreme loading conditions. Thus, the exploration of this pivotal plastic deformation mechanism is undertaken utilizing the phase-field methodology. Employing a monolithic solver, we solve the coupled highly nonlinear time-dependent Ginzburg–Landau equation and dynamic elasticity equation. Our analysis encompasses the consideration of surface tension stress in conjunction with a coherent solid–liquid interface subjected to uniaxial transformation strain, thereby unveiling intriguing facets of melting phenomena. The investigation delves into the influence of transformation strain, kinetic coefficient, and temperature on the thickness of the solid–liquid interface and its corresponding velocity. This analysis is conducted through meticulous comparison with existing experimental data and molecular dynamics simulation. Moreover, employing the phase-field method yields precise descriptions of the system kinetics, capturing virtual melting phenomena in both pristine and flawed nanowire configurations.
纳米线中的虚拟熔化现象对极端载荷条件下的材料耐久性具有深远影响,因此对其进行研究具有重要意义。因此,我们利用相场方法探索了这一关键的塑性变形机制。我们采用单片求解器,求解了高度非线性时变金兹堡-朗道方程和动态弹性方程。我们的分析考虑了表面张力应力与单轴转换应变下的相干固液界面,从而揭示了熔化现象的有趣方面。研究深入探讨了转化应变、动力学系数和温度对固液界面厚度及其相应速度的影响。这一分析是通过与现有实验数据和分子动力学模拟进行细致比较后得出的。此外,采用相场方法还能精确描述系统动力学,捕捉原始和有缺陷纳米线构型中的虚拟熔化现象。
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引用次数: 0
Constitutive modeling of thermo-chemical decomposition and thermo-mechanical deformation, coupled with transient heat conduction, in ablative matrix composite 烧蚀基复合材料热化学分解和热机械变形以及瞬态热传导的结构建模
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-23 DOI: 10.1016/j.ijsolstr.2024.113100
Rupesh Prasad, Shantanu S. Mulay, T. Jayachandran
Several thermal protection systems employ sacrificial composite layer that undergoes thermo-chemical decomposition in high-temperature environment. This results in the pyrolysis gas formation (endothermic reaction) that gets trapped inside the voids generated in the ablative matrix phase. These trapped gases apply pore pressure on the structure, along with the mechanical loading, thus significantly influencing the structure failure. A novel thermo-chemical (TC) decomposition and thermo-mechanical (TM) deformation-based coupled multi-physics formulation, applicable to ablative composite systems, is thus presented. A novel shrinkage expression, due to ablative matrix decomposition, is derived. The TC + TM coupled formulation is converted to stress update process, and its results are validated against the available experimental data. The proposed formulation is also converted to boundary value problem employing non-linear finite element framework (NL-FEM). The Jacobian matrices, for one- and two-dimensional cases, are systematically derived, and the proposed NL-FEM formulation is successfully verified against several benchmark problems.
The transient heat conduction equation is finally coupled with the proposed TC + TM formulation (one-way coupling) thus enabling the analysis of more realistic situations where the constant heating rate assumption is not valid. The coupled formulation is finally implemented for several test cases and it is demonstrated that, it has a significant influence on pore pressure and porosity evolution (through pore volumetric strain) within the ablative matrix phase.
一些热防护系统采用的牺牲复合材料层在高温环境下会发生热化学分解。这导致热解气体的形成(内热反应),并被截留在烧蚀基质相中产生的空隙内。这些被截留的气体与机械负载一起对结构产生孔隙压力,从而严重影响结构的失效。因此,本文提出了一种适用于烧蚀复合材料系统的新型热化学(TC)分解和热机械(TM)变形耦合多物理场计算方法。由于烧蚀基质分解,得出了一种新的收缩表达式。TC + TM 耦合公式转换为应力更新过程,其结果与现有实验数据进行了验证。此外,还利用非线性有限元框架(NL-FEM)将提议的公式转换为边界值问题。最后将瞬态热传导方程与提议的 TC + TM 公式(单向耦合)进行耦合,从而能够分析恒定加热速率假设无效的更现实情况。该耦合公式最终在几个测试案例中得到了应用,并证明它对烧蚀基质相内的孔隙压力和孔隙率演变(通过孔隙体积应变)具有重大影响。
{"title":"Constitutive modeling of thermo-chemical decomposition and thermo-mechanical deformation, coupled with transient heat conduction, in ablative matrix composite","authors":"Rupesh Prasad,&nbsp;Shantanu S. Mulay,&nbsp;T. Jayachandran","doi":"10.1016/j.ijsolstr.2024.113100","DOIUrl":"10.1016/j.ijsolstr.2024.113100","url":null,"abstract":"<div><div>Several thermal protection systems employ sacrificial composite layer that undergoes thermo-chemical decomposition in high-temperature environment. This results in the pyrolysis gas formation (endothermic reaction) that gets trapped inside the voids generated in the ablative matrix phase. These trapped gases apply pore pressure on the structure, along with the mechanical loading, thus significantly influencing the structure failure. A novel thermo-chemical (TC) decomposition and thermo-mechanical (TM) deformation-based coupled multi-physics formulation, applicable to ablative composite systems, is thus presented. A novel shrinkage expression, due to ablative matrix decomposition, is derived. The TC + TM coupled formulation is converted to stress update process, and its results are validated against the available experimental data. The proposed formulation is also converted to boundary value problem employing non-linear finite element framework (NL-FEM). The Jacobian matrices, for one- and two-dimensional cases, are systematically derived, and the proposed NL-FEM formulation is successfully verified against several benchmark problems.</div><div>The transient heat conduction equation is finally coupled with the proposed TC + TM formulation (one-way coupling) thus enabling the analysis of more realistic situations where the constant heating rate assumption is not valid. The coupled formulation is finally implemented for several test cases and it is demonstrated that, it has a significant influence on pore pressure and porosity evolution (through pore volumetric strain) within the ablative matrix phase.</div></div>","PeriodicalId":14311,"journal":{"name":"International Journal of Solids and Structures","volume":"306 ","pages":"Article 113100"},"PeriodicalIF":3.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Buckling analysis of PMMA hemispherical pressure shells with thickness variation 具有厚度变化的 PMMA 半球形压力壳的屈曲分析
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-22 DOI: 10.1016/j.ijsolstr.2024.113109
Longhui Wang , Yongmei Zhu , Xilu Zhao , Jian Zhang
The buckling behaviour of polymethyl methacrylate (PMMA) hemispherical pressure shells under uniform external pressure was investigated experimentally and numerically. Six PMMA hemispherical pressure shells were prepared via the free blow-forming process. The geometry and wall thickness of each hemispherical shell were measured. The collapse loads and final failure modes of all shells were obtained via a hydrostatic pressure device. In addition, through optical 3D scanning, a numerical model of the hemispherical shell that reflects the actual geometric imperfection was established and used in the finite element buckling analysis. The numerical results were in agreement with the test results. These findings provide a reference for evaluating the buckling load of PMMA hemispherical shells prepared via the free blow-forming process.
实验和数值研究了聚甲基丙烯酸甲酯(PMMA)半球形压力壳在均匀外压下的屈曲行为。通过自由吹塑工艺制备了六个 PMMA 半球形压力壳。测量了每个半球形壳体的几何形状和壁厚。通过静水压力装置获得了所有壳体的坍塌载荷和最终失效模式。此外,通过光学三维扫描,建立了反映实际几何缺陷的半球形壳体数值模型,并将其用于有限元屈曲分析。数值结果与测试结果一致。这些研究结果为评估通过自由吹塑工艺制备的 PMMA 半球形外壳的屈曲载荷提供了参考。
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引用次数: 0
Influence of block arrangement on mechanical performance in topological interlocking assemblies: A study of the versatile block 块体排列对拓扑互锁组件机械性能的影响:对多功能块的研究
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-20 DOI: 10.1016/j.ijsolstr.2024.113102
Tom Goertzen , Domen Macek , Lukas Schnelle , Meike Weiß , Stefanie Reese , Hagen Holthusen , Alice C. Niemeyer
Topological interlocking assemblies (TIA) are arrangements of blocks kinematically constrained by a fixed frame, such that all rigid body motions of each block are prevented by the neighbouring blocks and the frame. In the literature, several blocks are introduced that can be arranged into interlocking assemblies, however only few of them can be arranged in non-unique ways. This study investigates a particularly versatile interlocking block called the Versatile Block: this block can be arranged in three different doubly periodic ways given by wallpaper symmetries. We investigate the hypothesis that the arrangement of copies of the same block influences the mechanical response of a TIA. We examine the interlocking mechanism and the correlation between arrangement and overall structural performance in planar TIA consisting of the Versatile Block. Furthermore, we analyse load transfer mechanisms within the assemblies and from the assemblies onto the frame. For fast apriori evaluation of the load transfer onto the frame we introduce a combinatorial model called Interlocking Flows. To investigate our assemblies from a mechanical point of view we conduct several finite element studies. These reveal a strong influence of arrangement on the structural behaviour, for instance, an impact on both the point and amount of maximum deflection under a given load, thereby confirming our hypothesis. We also evaluate the accuracy of the proposed Interlocking Flow model by a comparison with the finite element simulations.
拓扑互锁组件(TIA)是指在运动学上受固定框架约束的块体排列,这样每个块体的所有刚体运动都会受到相邻块体和框架的阻止。文献中介绍了几种可以排列成互锁组件的积木块,但只有少数积木块可以以非唯一的方式进行排列。本研究调查了一种被称为 "多功能积木 "的多功能互锁积木:这种积木可以通过壁纸对称性以三种不同的双周期方式排列。我们研究的假设是,相同积木块副本的排列方式会影响 TIA 的机械响应。我们研究了由多功能块组成的平面 TIA 的互锁机制以及排列方式与整体结构性能之间的相关性。此外,我们还分析了组件内部以及从组件到框架的荷载传递机制。为了快速先验地评估荷载传递到框架上的情况,我们引入了一个名为 "互锁流 "的组合模型。为了从机械角度研究我们的组件,我们进行了多项有限元研究。研究结果表明,排列方式对结构行为有很大影响,例如,对给定载荷下的最大挠度点和最大挠度量都有影响,从而证实了我们的假设。我们还通过与有限元模拟进行比较,评估了所提出的互锁流模型的准确性。
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引用次数: 0
A multi-scale constitutive model for AlSi10Mg alloy fabricated via laser powder bed fusion 通过激光粉末床熔融技术制造的 AlSi10Mg 合金的多尺度构成模型
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-19 DOI: 10.1016/j.ijsolstr.2024.113111
Mingqi Lei , Ramesh Aditya , Lu Liu , Mao See Wu , Jundong Wang , Kun Zhou , Yao Yao
Additively Manufactured (AM) aluminum alloys find extensive applications in various fields due to their favorable properties. Numerical simulations play a crucial role in reducing experimental costs and enhancing reliability. Developing a reliable constitutive numerical model requires careful consideration of the hierarchical microstructure inherent in AM aluminum alloys. In response, a multiscale constitutive model has been formulated for the AlSi10Mg alloy, fabricated through laser powder bed fusion. This model incorporates crystal plasticity theory and micromechanics-based homogenization methods to establish representative volume elements at different length scales. These scales include the grain scale, polycrystalline scale, and macro scale, thus facilitating a seamless transition between them. The model is calibrated using macroscopic and average phase stress–strain relationships, demonstrating its capability to predict lattice strain in each phase. Additionally, this model incorporates a quantitative analysis of the effects of two-phase structure, melt pool structure, and porosity by adjusting microstructure parameters. The developed model is embedded into a user-defined material subroutine, providing an efficient approach to investigate microstructure-property relationships in AM alloys.
快速成型(AM)铝合金因其良好的性能而在各个领域得到广泛应用。数值模拟在降低实验成本和提高可靠性方面发挥着至关重要的作用。要开发可靠的结构数值模型,就必须仔细考虑 AM 铝合金固有的分层微观结构。为此,我们为通过激光粉末床融合制造的 AlSi10Mg 合金制定了一个多尺度构成模型。该模型结合了晶体塑性理论和基于微观力学的均质化方法,以建立不同长度尺度的代表性体积元素。这些尺度包括晶粒尺度、多晶尺度和宏观尺度,从而促进了它们之间的无缝过渡。该模型使用宏观和平均相应力应变关系进行校准,证明了其预测各相晶格应变的能力。此外,该模型还通过调整微观结构参数,对两相结构、熔池结构和孔隙率的影响进行了定量分析。开发的模型被嵌入到用户定义的材料子程序中,为研究 AM 合金的微观结构-性能关系提供了一种有效的方法。
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引用次数: 0
Three-dimensional buckling analysis of stiffened plates with complex geometries using energy element method 利用能量元素法对具有复杂几何形状的加劲板进行三维屈曲分析
IF 3.4 3区 工程技术 Q1 MECHANICS Pub Date : 2024-10-18 DOI: 10.1016/j.ijsolstr.2024.113105
Zhao Jing , Yanjie Liu , Lei Duan , Siqi Wang
A novel numerical method, energy element method (EEM), is proposed for the three-dimensional (3D) buckling analysis of stiffened plates with complex geometries. The problem is formulated in a cuboidal domain, and any complex geometric stiffened plate is modeled by assigning cutouts within the cuboidal domain. The stiffened plate is considered as an energy body and is discretized using Gauss points with variable stiffness properties to simulate its energy distribution. Incorporating the extended interval integration, Gauss quadrature, variable stiffness properties, and Chebyshev polynomials, the strain energy of stiffened plates with complex geometries can be numerically simulated by putting the stiffness and thickness of Gauss points in the cutouts to zero in the cuboidal domain. Using the principle of minimum potential energy and Ritz solution procedure, the deformation and buckling behaviors of stiffened plates with complex geometries can be captured. As a result of the new formulations in EEM, new standard energy functionals and solving procedures have been developed. In addition, Gauss points are generated within the energy elements accounting for the geometric boundaries of the stiffened plate, which are characterized by level set functions. EEM is employed to investigate complex-shaped stiffened plates with straight or curvilinear stiffeners, and the results are compared to those obtained using FEM or mesh-free method. The precision, generalization, and stability of EEM are demonstrated.
针对具有复杂几何形状的加劲板的三维(3D)屈曲分析,提出了一种新的数值方法--能量元素法(EEM)。问题在一个立方体域中提出,通过在立方体域中分配切口来模拟任何复杂几何加劲板。加劲板被视为一个能量体,使用具有可变刚度属性的高斯点进行离散化,以模拟其能量分布。结合扩展区间积分、高斯四则运算、可变刚度特性和切比雪夫多项式,通过在长方体域内将切口中高斯点的刚度和厚度置零,可对具有复杂几何形状的加劲板的应变能进行数值模拟。利用最小势能原理和 Ritz 求解程序,可以捕捉到具有复杂几何形状的加劲板的变形和屈曲行为。在 EEM 中采用新公式后,还开发了新的标准能量函数和求解程序。此外,还在能量元素内生成了高斯点,这些高斯点反映了加劲板的几何边界,并以水平集函数为特征。EEM 用于研究带有直线或曲线加强筋的复杂形状加强板,并将结果与使用有限元或无网格方法获得的结果进行比较。证明了 EEM 的精确性、通用性和稳定性。
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引用次数: 0
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International Journal of Solids and Structures
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