Archives of Mechanics最新文献_第4页

Mechanical characterization of millimetric agarose spheres using a resonant technique 用共振技术表征毫米琼脂糖球的力学特性

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-06-30 DOI: 10.24423/AOM.3499

J. Yescas, P. Mandal, J. Sinha, R. Snook, J. Hawkes, P. M. Garibaldi, R. Carrera-Espinoza

引用次数: 0

Thermo-diffusion of a thick circular plate via modified Green–Naghdi models 用改进的Green-Naghdi模型研究厚圆板的热扩散

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-06-30 DOI: 10.24423/AOM.3533

A. Zenkour

引用次数: 6

A study of the local entropy generation rate in a porous media burner 多孔介质燃烧器局部熵产率的研究

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-06-30 DOI: 10.24423/AOM.3416

I. Mohammadi, J. A. Esfahani, K. C. Kim

{"title":"A study of the local entropy generation rate in a porous media burner","authors":"I. Mohammadi, J. A. Esfahani, K. C. Kim","doi":"10.24423/AOM.3416","DOIUrl":"https://doi.org/10.24423/AOM.3416","url":null,"abstract":"In this paper, the work and performance of the premixed methane-air porous axisymmetrical burner have firstly been simulated numerically using the CFD tools. For this purpose the set of governing equations has been enriched by an additional energy equation in porous solid, and the chemical species transport has been extended onto the multi-step mechanism (GRI-2-11). This numerical model has been verified on the base of available benchmark experiments. Next, we have studied the local entropy generation problem taking into account not only classical contributions like viscous and turbulent dissipation but also, the porous combustion of gases. The results showed that the greatest portion of entropy generation in the porous medium burner is related to chemical reactions, followed by heat transfer, mass diffusion (mixing) and friction (viscous dissipation), respectively. According to the results, as the excess air ratio increases, the local entropy generation rate due to heat transfer and friction increases and the local entropy generation rate due to chemical reactions is decreased. Also, by increasing the volumetric heat transfer coefficient, the local entropy generation rate due to heat transfer decreases and the local entropy generation rate due to friction and chemical reactions increases. Also, the local entropy generation rate due to mixing does not show a significant change with the changing excess air ratio and volumetric heat transfer coefficient.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42797665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Performance of isotropic constitutive laws in simulating failure mechanisms in scaled RC beams 各向同性本构律在模拟比例混凝土梁破坏机制中的表现

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-06-30 DOI: 10.24423/AOM.3443

I. Marzec, J. Bobiński

引用次数: 1

Static, free and forced vibration analysis of a delaminated microbeam-based MEMS subjected to the electrostatic force 静电作用下分层微束MEMS的静态、自由和强制振动分析

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-04-30 DOI: 10.24423/AOM.3529

A. Razeghi-Harikandeei, B. Ganji, R. Jafari-Talookolaei, A. Abdipour

{"title":"Static, free and forced vibration analysis of a delaminated microbeam-based MEMS subjected to the electrostatic force","authors":"A. Razeghi-Harikandeei, B. Ganji, R. Jafari-Talookolaei, A. Abdipour","doi":"10.24423/AOM.3529","DOIUrl":"https://doi.org/10.24423/AOM.3529","url":null,"abstract":"In this paper, the delamination effect on the static and natural frequency response of a microbeam subjected to the nonlinear electrostatic force is studied using a semi-analytical approach for the first time. The Euler–Bernoulli beam assumption along with the non-classical modified couple stress theory is used to obtain the governing differential equation of motion and then a reduced-order model based on Galerkin’s decomposition method is obtained. At first the microbeam with very small delamination like an intact microbeam is solved and then the solution is compared with those reported in the literature and the solution obtained using 3D-coupled electromechanical software. After validation, the effects of delamination length and its locations in thickness and length directions on the microbeam behavior are investigated in details. It is shown that the delamination has remarkable effects on the characteristics of the microbeam, especially near the pull-in voltage. Also, the delaminated microbeam with various thicknesses is studied using both the classical and the non-classical theories. It is found that the difference between the two models is significant for the thin microbeam with a thickness near of below than its material length scale parameter. This investigation is helpful for the nondestructive detection of the delamination in the beams.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43325169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

An analytical study on the nonlinear forced vibration of functionally graded carbon nanotube-reinforced composite beams on nonlinear viscoelastic foundation 非线性粘弹性地基上功能梯度碳纳米管增强复合梁非线性受迫振动分析研究

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-04-30 DOI: 10.24423/AOM.3268

H. Shafiei, A. Setoodeh

{"title":"An analytical study on the nonlinear forced vibration of functionally graded carbon nanotube-reinforced composite beams on nonlinear viscoelastic foundation","authors":"H. Shafiei, A. Setoodeh","doi":"10.24423/AOM.3268","DOIUrl":"https://doi.org/10.24423/AOM.3268","url":null,"abstract":"This paper deals with the nonlinear forced vibration of nanocomposite beams resting on a nonlinear viscoelastic foundation and subjected to a transverse periodic excitation. It is considered that the functionally graded carbon nanotubereinforced composite (FG-CNTRC) beam is made of an isotropic matrix reinforced by either aligned- or randomly oriented-straight single-walled carbon nanotubes (SWCNTs) with four types of distributions through the thickness direction of the beam. Both the Eshelby–Mori–Tanaka approach and extended rule of mixtures are used to predict the effective material properties of the FG-CNTRC beams. The mathematical model of the beam is developed based on the Euler–Bernoulli beam theory together with von Karman assumptions. Subsequently, the accurate analytical solutions of the governing equation are obtained through applying the variational iteration method (VIM). Several examples are verified to have higher accuracy than those available in the literature. In addition, a comprehensive investigation into the effect of carbon nanotubes (CNTs) distribution, CNTs volume fraction, end supports, vibration amplitude, and foundation coefficients on the vibrational characteristics of the nanocomposite beam is performed and some new results are presented.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47005815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 7

n-sided polygonal hybrid finite elements involving element boundary integrals only for anisotropic thermal analysis 仅用于各向异性热分析的含单元边界积分的n边多边形混合有限元

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-04-30 DOI: 10.24423/AOM.3434

R. Cao, X. Zhao, W. Lin, Hui Wang

{"title":"n-sided polygonal hybrid finite elements involving element boundary integrals only for anisotropic thermal analysis","authors":"R. Cao, X. Zhao, W. Lin, Hui Wang","doi":"10.24423/AOM.3434","DOIUrl":"https://doi.org/10.24423/AOM.3434","url":null,"abstract":"As a combination of the traditional finite element method and boundary element method, the n-sided polygonal hybrid finite element method with fundamental solution kernels, named as HFS-FEM, is thoroughly studied in this work for two-dimensional heat conduction in fully anisotropic media. In this approach, the unknown temperature field within the polygon is represented by the linear combination of anisotropic fundamental solutions of problem to achieve the local satisfaction of the related governing equations, but not the specific boundary conditions and the continuity conditions across the element boundary. To tackle such a shortcoming, the frame temperature field is independently defined on the entire boundary of the polygonal element by means of the conventional one-dimensional shape function interpolation. Subsequently, by the hybrid functional with the assumed intra- and inter-element temperature fields, the stiffness equation can be obtained including the line integrals along the element boundary only, whose dimension is reduced by one compared to the domain integrals in the traditional finite elements. This means that the higher computing efficiency is expected. Moreover, any shaped polygonal elements can be constructed in a unified form with the same fundamental solution kernels, including convex and non-convex polygonal elements, to provide greater flexibility in meshing effort for complex geometries. Besides, the element boundary integrals endow the method higher versatility with a non-conforming mesh in the pre-processing stage of the analysis over the traditional FEM. No modification to the HFS-FEM formulation is needed for the non-conforming mesh and the element containing hanging nodes is treated normally as the one with more nodes. Finally, the accuracy, convergence, computing efficiency, stability of non-convex element, and straightforward treatment of non-conforming discretization are discussed for the present n-sided polygonal hybrid finite elements by a few applications in the context of anisotropic heat conduction.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49575370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Thermal buckling and free vibration of Euler–Bernoulli FG nanobeams based on the higher-order nonlocal strain gradient theory 基于高阶非局部应变梯度理论的Euler–Bernoulli-FG纳米梁的热屈曲和自由振动

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-03-18 DOI: 10.24423/AOM.3462

G. Janevski, Nikola Despenić, I. Pavlović

引用次数: 3

Three-phase parabolic inhomogeneities with internal uniform stresses in plane and anti-plane elasticity 具有平面内均匀应力和反平面弹性的三相抛物型不均匀性

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-02-27 DOI: 10.24423/AOM.3371

X. Wang, P. Schiavone

{"title":"Three-phase parabolic inhomogeneities with internal uniform stresses in plane and anti-plane elasticity","authors":"X. Wang, P. Schiavone","doi":"10.24423/AOM.3371","DOIUrl":"https://doi.org/10.24423/AOM.3371","url":null,"abstract":"We examine the in-plane and anti-plane stress states inside a parabolic inhomogeneity which is bonded to an infinite matrix through an intermediate coating. The interfaces of the three-phase parabolic inhomogeneity are two confocal parabolas. The corresponding boundary value problems are studied in the physical plane rather than in the image plane. A simple condition is found that ensures that the internal stress state inside the parabolic inhomogeneity is uniform and hydrostatic. Furthermore, this condition is independent of the elastic properties of the coating and the two geometric parameters of the composite: in fact, the condition depends only on the elastic constants of the inhomogeneity and the matrix and the ratio between the two remote principal stresses. Once this condition is met, the mean stress in the coating is constant and the hoop stress on the coating side is also uniform along the entire inhomogeneity-coating interface. The unconditional uniformity of stresses inside a three-phase parabolic inhomogeneity is achieved when the matrix is subjected to uniform remote anti-plane shear stresses. The internal uniform anti-plane shear stresses inside the inhomogeneity are independent of the shear modulus of the coating and the two geometric parameters of the composite.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47308853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 1

Guidelines to select suitable parameters for contour method stress measurements 为等高线法应力测量选择合适参数的指南

IF 0.8 4区工程技术

Archives of Mechanics Pub Date : 2020-02-26 DOI: 10.24423/AOM.3378

N. Naveed

{"title":"Guidelines to select suitable parameters for contour method stress measurements","authors":"N. Naveed","doi":"10.24423/AOM.3378","DOIUrl":"https://doi.org/10.24423/AOM.3378","url":null,"abstract":"The contour method is one of the promising techniques for the measurement of residual stresses in engineering components. In this method, the cut surfaces deform, owing to the relaxation of residual stresses. The deformations of the two cut surfaces are then measured and used to back calculate the 2-dimensional map of original residual stresses normal to the plane of the cut. Thus, it involves four main steps; specimen cutting, surface contour measurement, data analysis and finite element simulation. These steps should perform in a manner that they do not change the underlying features of surface deformation especially where the residual stress distribution varies over short distances. Therefore, to carefully implement these steps, it is important to select appropriate parameters such as surface deformation measurement spacing, data smoothing parameters (‘knot spacing’ for example cubic spline smoothing) and finite element mesh size. This research covers an investigation of these important parameters. A simple approach for choosing initial parameters is developed based on an idealised cosine displacement function (giving a self-equilibrated one-dimensional residual stress profile). In this research, guidelines are proposed to help the measurer to select the most suitable choice of these parameters based on the estimated wavelength of the residual stress field.","PeriodicalId":8280,"journal":{"name":"Archives of Mechanics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2020-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48838783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 4