Acta Mechanica最新文献_第5页

Nipping analysis of rectangular leaf springs 矩形钢板弹簧的夹紧分析

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-11 DOI: 10.1007/s00707-025-04275-z

Marko V. Lubarda, Vlado A. Lubarda

引用次数: 0

Study on the interface effect in a coated transversely isotropic material based on the three-dimensional green’s function for a normal point force 基于法向点力三维格林函数的涂覆横向各向同性材料界面效应研究

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-10 DOI: 10.1007/s00707-025-04240-w

Peng-Fei Hou, Hai-Yang Jiang

{"title":"Study on the interface effect in a coated transversely isotropic material based on the three-dimensional green’s function for a normal point force","authors":"Peng-Fei Hou, Hai-Yang Jiang","doi":"10.1007/s00707-025-04240-w","DOIUrl":"10.1007/s00707-025-04240-w","url":null,"abstract":"<div><p>This study presents a comprehensive analysis of layered materials, focusing on the behavior of coated transversely isotropic materials under normal point forces. With the growing application of such materials in engineering, this work addresses key challenges in their design and analysis. Due to the thin coating layers and steep stress gradients, achieving accurate calculations—particularly at the interface—using commercial software remains difficult. To overcome this, we propose an exact solution for the three-dimensional elastic field of coated structures subjected to a normal point force, based on the general solution for transversely isotropic materials. The derived solution, expressed through elementary functions, exhibits excellent convergence, accuracy, and stability. Numerical results are illustrated as stress component contours, offering valuable insights into interface effects and potential tensile and shear delamination. These findings contribute significantly to the precise design and analysis of coated materials, advancing their application in high-performance engineering systems.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"236 5","pages":"2765 - 2787"},"PeriodicalIF":2.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143930022","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

Metamaterial beam with resonators of active feedback control to broaden and tune the bandgaps 带有源反馈控制谐振器的超材料光束，用于拓宽和调节带隙

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-07 DOI: 10.1007/s00707-025-04273-1

Yuhang Wang, Lifeng Wang, Yuqiang Gao

{"title":"Metamaterial beam with resonators of active feedback control to broaden and tune the bandgaps","authors":"Yuhang Wang, Lifeng Wang, Yuqiang Gao","doi":"10.1007/s00707-025-04273-1","DOIUrl":"10.1007/s00707-025-04273-1","url":null,"abstract":"<div><p>Broadening and tuning the bandgap properties are important for the application of locally resonant metamaterials. However, the bandgap of classical locally resonant metamaterials is generally narrower. In this paper, a locally resonant metamaterial beam with active feedback control systems is proposed to broaden and tune the bandgap. The dispersion relation and transmissibility of the active control locally resonant metamaterial beam are obtained via the spectral element method and finite element method. The results show that the lower limit of locally resonant bandgap moves to lower frequency; meanwhile, the upper limit of locally resonant bandgap moves to higher frequency with the change of control gain. It breaks the restriction of locally resonant bandgap frequency range moving to higher frequency or lower frequency at the same time. The frequency range of the bandgap is greatly broadened. The locally resonant and Bragg bandgaps are coupled to form a broad bandgap by tuning the control gain and introducing damping. The metamaterial with damping can achieve vibration suppression over a wider frequency range. Vibration suppression over a wide frequency range is verified via the finite element method. The control robustness analysis is verified by considering the effects of noise and stiffness deviation on the system. This paper provides a novel method for broadband vibration suppression.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"236 3","pages":"2331 - 2343"},"PeriodicalIF":2.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638512","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

On the dynamics of a collapsing set of blocks 关于一组坍塌积木的动力学原理

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-06 DOI: 10.1007/s00707-024-04201-9

Theresa E. Honein, Oliver M. O’Reilly

{"title":"On the dynamics of a collapsing set of blocks","authors":"Theresa E. Honein, Oliver M. O’Reilly","doi":"10.1007/s00707-024-04201-9","DOIUrl":"10.1007/s00707-024-04201-9","url":null,"abstract":"<div><p>The dynamics of a collapsing stack of rigid blocks is explored in the present paper. Stacks of this type are ubiquitous mechanical systems that can be used to model boxes stacked in warehouses, containers on ships, and stacks of boxes being transported by robots. Although studies on the dynamics of a single block moving on a horizontal plane are well known to exhibit complex dynamics when the plane is subject to a harmonic motion, the dynamics of a stack of blocks proves to be far more complex in part because of frictional contacts and impacts between the blocks and the wide range of potential configurations. As analytical methods are untractable to study the dynamics of these systems, recourse to numerical methods is necessary. In the present paper, a non-smooth generalized-alpha method for systems with frictional contact and impact is used to compute the dynamics of the stack. The method is used to examine the instability of the Leaning Tower of Lire and the collapse of a stack of blocks under harmonic excitation. While the simulations show the expected result that high-frequency excitation of the bottom block of a stack tends to stabilize a stack, they also reveal the existence of an abundance of distinct numerical solutions stemming from a unique initial configuration. The abundance of solutions has application to robotics as it illuminates the challenges of controlling the motion of a robot so that it can successfully transport a stack of blocks.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"236 4","pages":"2345 - 2362"},"PeriodicalIF":2.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00707-024-04201-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new method of determining symmetry types of the fifth-order elastic stiffness tensor in the (first) strain-gradient theory 一阶应变梯度理论中确定五阶弹性刚度张量对称型的新方法

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-04 DOI: 10.1007/s00707-025-04272-2

Lei Zhang, Rong Wang, Rencai He, Changxin Tang

引用次数: 0

Dynamic response of wave propagation in functionally graded beams with defects: effects of porosity and cracks 含缺陷的功能梯度梁的波传播动力响应：孔隙率和裂纹的影响

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-03 DOI: 10.1007/s00707-025-04270-4

Mourad Benadouda, Mohammed El Amin Bourouis, Mouloud Dahmane, Riadh Bennai, Hassen Ait Atmane, Omar Safer

{"title":"Dynamic response of wave propagation in functionally graded beams with defects: effects of porosity and cracks","authors":"Mourad Benadouda, Mohammed El Amin Bourouis, Mouloud Dahmane, Riadh Bennai, Hassen Ait Atmane, Omar Safer","doi":"10.1007/s00707-025-04270-4","DOIUrl":"10.1007/s00707-025-04270-4","url":null,"abstract":"<div><p>The analysis of the dynamic response to wave propagation in the FG pinned–pinned beams with various defects, such as cracks and varying porosity distributions, is what this paper has to offer. The bidirectional distribution, which is primarily represented in the density, Poisson coefficient, and Young's modulus, is taken into consideration while developing higher-order shear deformation beam theory for wave propagation in defective FG structure beams. A power law index is used to assess the thickness and width of the porous FG beam's material properties. Using Hamilton's principle, the governing equations of wave propagation in the multi-crack porous 2D-FG beam are derived. An eigenvalue problem is solved to determine the bidirectional porous FG beam's analytic dispersion relation. Three models of porosity that approximate distributions were examined. There was a high degree of consistency between the results obtained for bidirectional FG cracked beams and those documented in the literature. The influence of different parameters, the number of waves propagating, the volume fraction distributions, and the porosity models on the dynamic of wave propagation modes in imperfect functionally graded beams are covered in detail, and to look into how significant parameters affect the damaged structure's dynamic behavior. This study innovates by combining the simultaneous analysis of the effects of bidirectional porosity and multiple cracks, thus providing a more complete understanding of the complex interactions influencing wave propagation. In addition, it proposes new porosity models adapted to composite materials, which had not been fully explored in previous research.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"236 3","pages":"2279 - 2296"},"PeriodicalIF":2.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638270","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

Morphogenesis strategies of hollow plants: avoidance of ovalization 中空植物的形态发生策略：避免卵化

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-03 DOI: 10.1007/s00707-025-04261-5

Carol Lee Chalermsin, Tohya Kanahama, Motohiro Sato

引用次数: 0

Semi-analytical solutions of three-dimensional thermoelectromechanical coupling frictionless contact problem of thermoelectric materials 热电材料三维热电耦合无摩擦接触问题的半解析解

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-03 DOI: 10.1007/s00707-025-04276-y

Jialing Li, Huoming Shen, Chi Hu, Guoyong Zhang, Juan Liu, Yuxing Wang

引用次数: 0

Development of new thermoelastic Petrov–Galerkin finite elements with enhanced precision and distortion tolerance 具有更高精度和畸变容忍度的新型热弹性Petrov-Galerkin有限元的开发

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-02 DOI: 10.1007/s00707-025-04260-6

Ming-Jun Zhao, Song Cen, Yan Shang, Chen-Feng Li

{"title":"Development of new thermoelastic Petrov–Galerkin finite elements with enhanced precision and distortion tolerance","authors":"Ming-Jun Zhao, Song Cen, Yan Shang, Chen-Feng Li","doi":"10.1007/s00707-025-04260-6","DOIUrl":"10.1007/s00707-025-04260-6","url":null,"abstract":"<div><p>The finite element method (FEM) serves as a crucial tool for addressing problems involving thermoelastic coupling. However, most current thermoelastic elements inherit shortcomings from the conventional finite element models, such as the sensitivity problem in relation to mesh distortion. The aim of this article is to extend some recent element techniques to thermoelastic analysis by developing new Petrov–Galerkin finite elements with high precision and distortion tolerance. This includes a plane 4-node 12-DOF (two displacements and one temperature per node) quadrilateral element US-ATFQ4T and a 3D 8-node 32-DOF (three displacements and one temperature per node) hexahedral element US-ATFH8T. The coupling stiffness matrices of the elements are meticulously assembled by the derivation from the virtual work principle. The mechanical part employs two different sets of shape functions: the isoparametric interpolation for test functions and the interpolation with a sequence of general solutions of homogenous control equations in linear elasticity, named by analytical trial functions (ATFs), for trial functions. The thermal part follows the traditional isoparametric interpolation mode. Numerical examples demonstrate high performance of the proposed elements with quality results even under coarse and distorted meshes.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"236 3","pages":"2233 - 2268"},"PeriodicalIF":2.3,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638214","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

A simple analytical model for static and dynamic analysis of unsymmetrical bi-stable variable stiffness composite laminated plates 非对称双稳变刚度复合材料层合板静动力分析的简单解析模型

IF 2.3 3区工程技术

Acta Mechanica Pub Date : 2025-03-01 DOI: 10.1007/s00707-025-04268-y

Hadi Ghashochi-Bargh, Iman Keshtegar

引用次数: 0