Interaction and multiscale mechanics最新文献

Energy and force transition between atoms and continuum in quasicontinuum method 准连续体方法中原子与连续体之间的能量和力跃迁

Interaction and multiscale mechanics Pub Date : 2014-03-25 DOI: 10.12989/IMM.2014.7.1.543

Shu‐Wei Chang, Y. Liao, Chang-Wei Huang, Chuin-Shan Chen

{"title":"Energy and force transition between atoms and continuum in quasicontinuum method","authors":"Shu‐Wei Chang, Y. Liao, Chang-Wei Huang, Chuin-Shan Chen","doi":"10.12989/IMM.2014.7.1.543","DOIUrl":"https://doi.org/10.12989/IMM.2014.7.1.543","url":null,"abstract":"We present a full energy and force formulation of the quasicontinuum method with non-local and local transition elements. Non-local transition elements are developed to transmit inhomogeneity from the atomistic to the continuum regions. Local transition elements are developed to resolve the mathematical mismatch between non-local atoms and the local continuum. The rationale behind these transition elements is provided by analyzing the energy and force transitions between atoms and continuum under the Cauchy-Born rule. We show that breakdown of the Cauchy-Born rule occurs for slaved atoms of local elements within the cutoff of non-local atoms. The inadequacy of the Cauchy-Born rule at the transition region naturally leads to the need of atomistic treatment of transition slaved and transition representative atoms. Such an atomistic treatment together with a full or cutoff sampling allows non-local transition elements containing these transition entities to transmit inhomogeneity. Different force formulations for transition representative atoms and pure local representative atoms allow the local transition elements to resolve non-local and local mismatches. The method presented herein is validated by force calculations in an unstressed perfect crystal as well as an unrelaxed grain boundary model. A nanoindentation simulation in 3D is conducted to demonstrate the accuracy and efficiency of the proposed method.","PeriodicalId":202748,"journal":{"name":"Interaction and multiscale mechanics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114591261","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

Localized particle boundary condition enforcements for the state-based peridynamics 基于状态的周动力学的局部粒子边界条件

Interaction and multiscale mechanics Pub Date : 2014-03-25 DOI: 10.12989/CSM.2015.4.1.001

C. T. Wu, B. Ren

引用次数: 6

Investigation of ship collision with floating pier structures 船舶与浮墩结构体碰撞研究

Interaction and multiscale mechanics Pub Date : 2014-03-25 DOI: 10.12989/CSM.2014.3.3.319

A. Chegenizadeh, B. Ghadimi, H. Nikraz

引用次数: 2

Interaction analysis of a building frame supported on pile groups 群桩支撑建筑框架的相互作用分析

Interaction and multiscale mechanics Pub Date : 2014-03-25 DOI: 10.12989/CSM.2014.3.3.305

P. Dode, H. Chore, D. K. Agrawal

{"title":"Interaction analysis of a building frame supported on pile groups","authors":"P. Dode, H. Chore, D. K. Agrawal","doi":"10.12989/CSM.2014.3.3.305","DOIUrl":"https://doi.org/10.12989/CSM.2014.3.3.305","url":null,"abstract":"The study deals with the physical modeling of a typical building frame resting on pile foundation and embedded in cohesive soil mass using complete three-dimensional finite element analysis. Two different pile groups comprising four piles () and nine piles () are considered. Further, three different pile diameters along with the various pile spacings are considered. The elements of the superstructure frame and those of the pile foundation are descretized using twenty-node isoparametric continuum elements. The interface between the pile and pile and soil is idealized using sixteen-node isoparametric surface elements. The current study is an improved version of finite element modeling for the soil elements compared to the one reported in the literature (Chore and Ingle 2008). The soil elements are discretized using eight-, nine- and twelve-node continuum elements. Both the elements of superstructure and substructure (i.e., foundation) including soil are assumed to remain in the elastic state at all the time. The interaction analysis is carried out using sub-structure approach in the parametric study. The total stress analysis is carried out considering the immediate behaviour of the soil. The effect of various parameters of the pile foundation such as spacing in a group and number piles in a group, along with pile diameter, is evaluated on the response of superstructure. The response includes the displacement at the top of the frame and bending moment in columns. The soil-structure interaction effect is found to increase displacement in the range of 58 -152% and increase the absolute maximum positive and negative moments in the column in the range of 14-15% and 26-28%, respectively. The effect of the soil- structure interaction is observed to be significant for the configuration of the pile groups and the soil considered in the present study.","PeriodicalId":202748,"journal":{"name":"Interaction and multiscale mechanics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127777650","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: 36

RBF-POD reduced-order modeling of DNA molecules under stretching and bending DNA分子在拉伸和弯曲作用下的RBF-POD降阶模型

Interaction and multiscale mechanics Pub Date : 2013-12-25 DOI: 10.12989/IMM.2013.6.4.395

Chung-Hao Lee, Jiun-Shyan Chen

引用次数: 2

Interactive analysis of a building fame resting on pile foundation 某桩基础建筑名气的相互作用分析

Interaction and multiscale mechanics Pub Date : 2013-12-25 DOI: 10.12989/CSM.2014.3.4.367

H. Chore

{"title":"Interactive analysis of a building fame resting on pile foundation","authors":"H. Chore","doi":"10.12989/CSM.2014.3.4.367","DOIUrl":"https://doi.org/10.12989/CSM.2014.3.4.367","url":null,"abstract":". The study deals with the physical modeling of a typical single storeyed building frame resting on pile foundation and embedded in cohesive soil mass using the finite element based software SAP-IV. Two groups of piles comprising two and three piles, with series and parallel arrangement thereof, are considered. The slab provided at top and bottom of the frame along with the pile cap is idealized as four noded and two dimensional thin shell elements. The beams and columns of the frame, and piles are modeled using two noded one dimensional beam-column element. The soil is modeled using closely spaced discrete linear springs. A parametric study is carried out to investigate the effect of various parameters of the pile foundation, such as spacing in a group and number of piles in a group, on the response of superstructure. The response considered includes the displacement at the top of the frame and bending moment in columns. The soil-structure interaction effect is found to increase the displacement in the range of 38 -133% and to increase the absolute maximum positive and negative moments in the column in the range of 2-12% and 2-11%. The effect of the soil- structure interaction is observed to be significant for the type of foundation and soil considered in this study. The results obtained are compared further with those of Chore et al . (2010), wherein different idealizations were used for modeling the superstructure frame and sub-structure elements (foundation). While fair agreement is observed in the results in either study, the trend of the results obtained in both studies is also same.","PeriodicalId":202748,"journal":{"name":"Interaction and multiscale mechanics","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115610409","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: 5

ABC optimization of TMD parameters for tall buildings with soil structure interaction 土-结构相互作用下高层建筑TMD参数ABC优化

Interaction and multiscale mechanics Pub Date : 2013-12-12 DOI: 10.12989/IMM.2013.6.4.339

A. Farshidianfar, Saeed Soheili

引用次数: 41

Forced vibration analysis of a dam-reservoir interaction problem in frequency domain 某坝库相互作用问题的频域强迫振动分析

Interaction and multiscale mechanics Pub Date : 2013-12-12 DOI: 10.12989/CSM.2014.3.4.385

A. Keivani, A. Shooshtari, A. A. Sani

引用次数: 8

Molecular dynamics studies of interaction between hydrogenand carbon nano-carriers 氢与碳纳米载体相互作用的分子动力学研究

Interaction and multiscale mechanics Pub Date : 2013-09-01 DOI: 10.12989/CSM.2014.3.4.329

Yun-Che Wang, C. Wu, Chi Chen, Ding-Shen Yang

{"title":"Molecular dynamics studies of interaction between hydrogenand carbon nano-carriers","authors":"Yun-Che Wang, C. Wu, Chi Chen, Ding-Shen Yang","doi":"10.12989/CSM.2014.3.4.329","DOIUrl":"https://doi.org/10.12989/CSM.2014.3.4.329","url":null,"abstract":"In this work, quantum molecular dynamics simulations (QMD) are preformed to study the hydrogen molecules in three types of carbon nanostructures, fullerene, (5,5) and (9,0) carbon nanotubes and graphene layers. Interactions between hydrogen and the nanostructures is of importance to understand hydrogen storage for the development of hydrogen economy. The QMD method overcomes the difficulties with empirical interatomic potentials to model the interaction among hydrogen and carbon atoms in the confined geometry. In QMD, the interatomic forces are calculated by solving the Schrodinger's equation with the density functional theory (DFT) formulation, and the positions of the atomic nucleus are calculated with the Newton's second law in accordance with the Born-Oppenheimer approximation. It is found that the number of hydrogen atoms that is less than 58 can be stored in the fullerene. With larger carbon fullerenes, more hydrogen may be stored. For hydrogen molecules passing though the fullerene, a particular orientation is required to obtain least energy barrier. For carbon nanotubes and graphene, adsorption may adhere hydrogen atoms to carbon atoms. In addition, hydrogen molecules can also be stored inside the nanotubes or between the adjacent layers in graphite, multi-layer graphene.","PeriodicalId":202748,"journal":{"name":"Interaction and multiscale mechanics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127403712","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: 3

Incompressible smoothed particle hydrodynamics modeling of thermal convection 热对流的不可压缩光滑粒子流体动力学建模

Interaction and multiscale mechanics Pub Date : 2013-09-01 DOI: 10.12989/IMM.2013.6.2.211

Burniadi Moballa, M. Chern, E. Odhiambo

{"title":"Incompressible smoothed particle hydrodynamics modeling of thermal convection","authors":"Burniadi Moballa, M. Chern, E. Odhiambo","doi":"10.12989/IMM.2013.6.2.211","DOIUrl":"https://doi.org/10.12989/IMM.2013.6.2.211","url":null,"abstract":"An incompressible smoothed particle hydrodynamics (ISPH) method based on the incremental pressure projection method is developed in this study. The Rayleigh-Bnard convection in a square enclosure is used as a validation case and the results obtained by the proposed ISPH model are compared to the benchmark solutions. The comparison shows that the established ISPH method has a good performance in terms of accuracy. Subsequently, the proposed ISPH method is employed to simulate natural convection from a heated cylinder in a square enclosure. It shows that the predictions obtained by the ISPH method are in good agreements with the results obtained by previous studies using alternative numerical methods. A rotating and heated cylinder is also considered to study the effect of the rotation on the heat transfer process in the enclosure space. The numerical results show that for a square enclosure at, the addition of kinetic energy in the form of rotation does not enhance the heat transfer process. The method is also applied to simulate forced convection from a circular cylinder in an unbounded uniform flow. In terms of results, it turns out that the proposed ISPH model is capable to simulate heat transfer problems with the complex and moving boundaries.","PeriodicalId":202748,"journal":{"name":"Interaction and multiscale mechanics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122097722","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: 3