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Mechanically Based Nonlocal Euler-Bernoulli Beam Model 基于机械的非局部欧拉-伯努利梁模型
Journal of nanomechanics & micromechanics Pub Date : 2014-03-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000077
M. Paola, G. Failla, M. Zingales
{"title":"Mechanically Based Nonlocal Euler-Bernoulli Beam Model","authors":"M. Paola, G. Failla, M. Zingales","doi":"10.1061/(ASCE)NM.2153-5477.0000077","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000077","url":null,"abstract":"AbstractThis paper presents a nonlocal Euler-Bernoulli beam model. It is assumed that the equilibrium of a beam segment is attained because of the classical local stress resultants, along with long-range volume forces and moments exchanged by the beam segment with all the nonadjacent beam segments. Elastic long-range volume forces/moments are considered, built as linearly depending on the product of the volumes of the interacting beam segments and on generalized measures of their relative motion, based on the pure deformation modes of the beam. Attenuation functions governing the space decay of the nonlocal effects are introduced. The motion equations are derived in an integro-differential form by applying Hamilton’s principle. Numerical results are presented for a variety of nonlocal parameters. A comparison with experimental data is also provided.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58477079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Cyclic Indentation Behavior of Layered Nanocomposites: Viscoplastic Numerical Study 层状纳米复合材料的循环压痕行为:粘塑性数值研究
Journal of nanomechanics & micromechanics Pub Date : 2014-03-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000076
C. Blada, Y. Shen
{"title":"Cyclic Indentation Behavior of Layered Nanocomposites: Viscoplastic Numerical Study","authors":"C. Blada, Y. Shen","doi":"10.1061/(ASCE)NM.2153-5477.0000076","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000076","url":null,"abstract":"AbstractThe indentation behavior of layered metal/ceramic nanocomposites was studied. The primary objective was to examine the evolving plastic deformation in the ductile metal constrained by the hard ceramic layers, during indentation cycling with respect to fixed maximum and minimum indentation loads. The model consists of alternating aluminum and silicon carbide thin films on a silicon substrate, with the Al/SiC layered structure being indented by a diamond indenter. The rate-dependent viscoplastic response of Al was specifically taken into account in the numerical model. Plastic deformation in the ductile Al layers continued to occur during the unloading phase of the first cycle, in addition to during subsequent reload/unload processes. Cyclic plasticity resulted in an open load-displacement loop and the indenter continued to move deeper in accordance with each cycle. For the control model of a thick homogeneous Al layer, there was no hysteresis loop and the transient behavior approached stabilization...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58477061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Transmission X-Ray Microscope Nanoscale Characterization and 3D Micromechanical Modeling of Internal Frost Damage in Cement Paste 水泥浆体内部冻损的透射x射线显微镜纳米尺度表征及三维微力学建模
Journal of nanomechanics & micromechanics Pub Date : 2014-03-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000080
Qingli Dai, Kenny Ng
{"title":"Transmission X-Ray Microscope Nanoscale Characterization and 3D Micromechanical Modeling of Internal Frost Damage in Cement Paste","authors":"Qingli Dai, Kenny Ng","doi":"10.1061/(ASCE)NM.2153-5477.0000080","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000080","url":null,"abstract":"AbstractThis study employed the transmission X-ray microscope (TXM) characterization and three-dimensional (3D) cohesive zone modeling (CZM) techniques to investigate the internal-frost damage in cement paste samples. The microscale cement samples were tested under controlled freeze-thaw cycles. The TXM technique was applied to perform fast-image acquisition of capillary pores and micro-damage evolution at 30 nm resolutions. The constructed 3D nanostructures of tested specimens were used in two ways: digital sample generation for model simulation and model prediction on crack propagation. The thermodynamics principles were applied to calculate the ice crystallization pressure within saturated pores under subcooling temperatures. The 3D bilinear CZM techniques were applied to predict the internal-frost damage evolution under the calculated crystallization pressure exerted on pore walls. The CZM predicted crack propagation was favorably compared with the TXM captured micro-damage. The micromechanical modeli...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58478331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Fractional-Order Thermal Energy Transport for Small-Scale Engineering Devices 小型工程装置的分数阶热能输运
Journal of nanomechanics & micromechanics Pub Date : 2014-03-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000074
M. Zingales, G. Failla, Umberto Rizzo
{"title":"Fractional-Order Thermal Energy Transport for Small-Scale Engineering Devices","authors":"M. Zingales, G. Failla, Umberto Rizzo","doi":"10.1061/(ASCE)NM.2153-5477.0000074","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000074","url":null,"abstract":"AbstractFractional-order thermodynamics has proved to be an efficient tool to describe several small-scale and/or high-frequency thermodynamic processes, as shown in many engineering and physics applications. The main idea beyond fractional-order physics and engineering relies on replacing the integer-order operators of classical differential calculus with their real-order counterparts. In this study, the authors aim to extend a recently proposed physical picture of fractional-order thermodynamics to a generic 3D rigid heat conductor where the thermal energy transfer is due to two phenomena: a short-range heat flux ruled by stationary and nonstationary transport equations, and a long-range thermal energy transport representing a ballistic effects among thermal energy propagators. Thermodynamic consistency of the model is investigated introducing the state function of the temperature field, namely the entropy, and obtaining the thermodynamic restrictions on the signs of the coefficients involved in the pro...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58476759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Piezoelectric Effect on the Buckling of Piezoelectric Thin Film with Viscoelastic Substrate 压电效应对粘弹性压电薄膜屈曲的影响
Journal of nanomechanics & micromechanics Pub Date : 2014-03-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000081
Zhidong Zhou, Dong-dong Wang, Q. Jiang
{"title":"Piezoelectric Effect on the Buckling of Piezoelectric Thin Film with Viscoelastic Substrate","authors":"Zhidong Zhou, Dong-dong Wang, Q. Jiang","doi":"10.1061/(ASCE)NM.2153-5477.0000081","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000081","url":null,"abstract":"AbstractThis work aims to study the buckling kinetic process of a piezoelectric thin film (nanoribbon) bonded to a viscoelastic compliant layer with rigid support. The piezoelectric thin film is assumed to be poled in the thickness direction and is governed by the nonlinear coupled electromechanical equations. Subsequently, on the basis of the classical elastic-viscoelastic correspondence principle, the kinetic process of the thin film buckling under the intermediate stress state is analyzed in a systematic manner. In particular the piezoelectric effect is examined with respect to the critical wavelength, the wavelength of the fastest growing mode, the critical stress, and the fastest growth rate in detail. The results evince that the piezoelectricity has an evident stiffening effect on the kinetic buckling process of the thin film with viscoelastic substrate.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58478359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nanoindentation Characterization of Asphalt Concrete Aging 沥青混凝土老化的纳米压痕表征
Journal of nanomechanics & micromechanics Pub Date : 2014-03-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000061
R. Tarefder, H. Faisal
{"title":"Nanoindentation Characterization of Asphalt Concrete Aging","authors":"R. Tarefder, H. Faisal","doi":"10.1061/(ASCE)NM.2153-5477.0000061","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000061","url":null,"abstract":"AbstractAsphalt concrete (AC) consists of coarse aggregate, asphalt binder, and fines. The asphalt binder creates an asphalt film around the coarse aggregate and fines. Fines are trapped inside the binder film, which is also known as mastic. Mastic and aggregate govern most of the mechanical properties of AC. Therefore, researchers have performed various tests on mastic to understand macroscale behavior of AC. Nanomechanical characterization is more appropriate for mastic, as the thinness of mastic is approximately 15–20 μm around an aggregate particle. For this paper, the authors conducted nanoindentation tests on mastic and aggregate as integral parts of AC. In particular, they compared the modulus and hardness of oven-aged mastic and aggregate with those of unaged mastic and aggregate. To deal with the heterogeneity of the mastic part, they made hundreds of indents on the mastic part of each AC sample. On the aggregate part, they made 60 indents to determine the mechanical properties of the aggregate o...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58476152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 42
Atomic-Level Shear Stress-Strain Behavior of β-Sn β-Sn的原子水平剪应力-应变行为
Journal of nanomechanics & micromechanics Pub Date : 2013-12-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000066
Yongchang Lee, C. Basaran
{"title":"Atomic-Level Shear Stress-Strain Behavior of β-Sn","authors":"Yongchang Lee, C. Basaran","doi":"10.1061/(ASCE)NM.2153-5477.0000066","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000066","url":null,"abstract":"AbstractShear deformation of β-Sn along five different lattice orientations is studied at the atomic level. Simulated models are perfect β-Sn lattice without defects. To study the atomic behavior and constitutive relationship of β-Sn in shear, the β-Sn models are simulated by a molecular dynamics simulation package, LAMMPS, and the shear stress is computed by using virial stress. A modified embedded-atom method is employed for the β-Sn potential. The constant shear strain rate, 17.5 (%/ns), is applied. Simulation is conducted by using a canonical ensemble. To investigate thermal effects, the models are simulated at three different temperatures, 27, 127, and 227°C, and the results were compared with experimental data.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"3 1","pages":"04013003"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58476649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Efficient Numerical Evaluation of Semianalytical Models for Squeeze Film Damping for Torsion Mirrors 扭力镜挤压膜阻尼半解析模型的有效数值评价
Journal of nanomechanics & micromechanics Pub Date : 2013-09-12 DOI: 10.1061/(ASCE)NM.2153-5477.0000075
M. Gugat
{"title":"Efficient Numerical Evaluation of Semianalytical Models for Squeeze Film Damping for Torsion Mirrors","authors":"M. Gugat","doi":"10.1061/(ASCE)NM.2153-5477.0000075","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000075","url":null,"abstract":"Abstract In the semianalytical models for squeeze film damping, the coefficient of damping torque is expressed as an infinite double series. To work with these models, methods for the efficient numerical evaluation of these double series are important, because, as has been pointed out, the results are given by complicated equations; the application of the results is difficult. This paper presents a transformation of the equations that allows a fast and reliable numerical evaluation of the coefficient of damping torque for torsion mirrors. We give precise error bounds and present examples that illustrate that approximations with one or two terms are often sufficient in practice.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"3 1","pages":"06013001"},"PeriodicalIF":0.0,"publicationDate":"2013-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58476780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
New and Improved Analytical Solutions for the Self-Folding Problem of Carbon Nanotubes 碳纳米管自折叠问题的新改进解析解
Journal of nanomechanics & micromechanics Pub Date : 2013-09-04 DOI: 10.1061/(ASCE)NM.2153-5477.0000078
Y. Mikata
{"title":"New and Improved Analytical Solutions for the Self-Folding Problem of Carbon Nanotubes","authors":"Y. Mikata","doi":"10.1061/(ASCE)NM.2153-5477.0000078","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000078","url":null,"abstract":"AbstractIt has been observed experimentally and computationally that a carbon nanotube with a large aspect ratio can self-fold because of the van der Waals force between parts of the same carbon nanotube. The primary issue in the self-folding problem is to determine the minimum threshold length of a carbon nanotube at which it becomes possible for a carbon nanotube to self-fold because of the van der Waals force. In this paper, approximate mathematical models based on both energy and force methods are constructed for the self-folding problem of carbon nanotubes and they are solved exactly as an elastica problem using elliptic functions. This paper is a sequel to previous papers by the writer and a more realistic and accurate deformation of a self-folded CNT (carbon nanotube) is used in the models. The primary result of this paper is determination of the critical threshold (minimum) length of a carbon nanotube as a function of geometry, material parameters, and force field parameters for particular atomic ...","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"3 1","pages":"04013004-04013004"},"PeriodicalIF":0.0,"publicationDate":"2013-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58477155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Special Section on Mechanics of Nanocomposites and Nanostructures 纳米复合材料和纳米结构力学专题
Journal of nanomechanics & micromechanics Pub Date : 2013-09-01 DOI: 10.1061/(ASCE)NM.2153-5477.0000073
N. Rahbar, Caglar Oskay, H. Yin
{"title":"Special Section on Mechanics of Nanocomposites and Nanostructures","authors":"N. Rahbar, Caglar Oskay, H. Yin","doi":"10.1061/(ASCE)NM.2153-5477.0000073","DOIUrl":"https://doi.org/10.1061/(ASCE)NM.2153-5477.0000073","url":null,"abstract":"This special section includes a selection of original research papers focused on the mechanics of nanocomposites and nanostructures. The September issue includes the first set of papers on the subject. Most of the papers were also presented at the Nanomechanics and Nanocomposites Symposium at the 2012 Conference of the Engineering Mechanics Institute of the American Society of Civil Engineers held at Notre Dame University in South Bend, Indiana. The Nanomechanics and Nanocomposites Symposium provided a unique venue for researchers exploring the intersections of applied and computational mechanics within the field of materials science at the nanoscale. In this area, there are both tremendous challenges and opportunities. It is humbling to consider the limitations of our current knowledge about the structures and properties of materials at the smaller scales. On the other hand, it is bewildering to consider all of the possibilities for breakthroughs in the engineering disciplines that might be achieved by understanding our world and employing that knowledge to make advances in the materials we use. Although this symposium featured papers on a wide variety of topics, mechanics of materials at the nanoscale was a dominant theme discussed. Indeed, four of the five papers in this first series were devoted entirely to nanomechanical behavior of materials, and a majority of the remaining papers also focused, at least in part, on aspects of nanomechanics. Accordingly, we are pleased to publish this collection of papers in the similarly themed Journal of Nanomechanics and Micromechanics. We believe these papers represent some of the wide scope seen in the field.","PeriodicalId":90606,"journal":{"name":"Journal of nanomechanics & micromechanics","volume":"3 1","pages":"36-36"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1061/(ASCE)NM.2153-5477.0000073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58476674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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