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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Interaction and multiscale mechanics
Journal Basic Information
Journal DOI :
Editor in Chief :
J. S. Chen / Y.B. Yang / C. S. David Chen
Volume & Issues
Volume 5, Issue 4 - Dec 2012
Volume 5, Issue 3 - Sep 2012
Volume 5, Issue 2 - Jun 2012
Volume 5, Issue 1 - Mar 2012
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Inelastic stability analysis of high strength rectangular concrete-filled steel tubular slender beam-columns
Patel, Vipulkumar Ishavarbhai ; Liang, Qing Quan ; Hadi, Muhammad N.S. ;
Interaction and multiscale mechanics, volume 5, issue 2, 2012, Pages 91~104
DOI : 10.12989/imm.2012.5.2.091
There is relatively little numerical study on the behavior of eccentrically loaded high strength rectangular concrete-filled steel tubular (CFST) slender beam-columns with large depth-to-thickness ratios, which may undergo local and global buckling. This paper presents a multiscale numerical model for simulating the interaction local and global buckling behavior of high strength thin-walled rectangular CFST slender beam-columns under eccentric loading. The effects of progressive local buckling are taken into account in the mesoscale model based on fiber element formulations. Computational algorithms based on the M
ller's method are developed to obtain complete load-deflection responses of CFST slender beam-columns at the macroscale level. Performance indices are proposed to quantify the performance of CFST slender beam-columns. The accuracy of the multiscale numerical model is examined by comparisons of computer solutions with existing experimental results. The numerical model is utilized to investigate the effects of concrete compressive strength, depth-to-thickness ratio, loading eccentricity ratio and column slenderness ratio on the performance indices. The multiscale numerical model is shown to be accurate and efficient for predicting the interaction buckling behavior of high strength thin-walled CFST slender beam-columns.
Dynamic analysis of rigid roadway pavement under moving traffic loads with variable velocity
Alisjahbana, S.W. ; Wangsadinata, W. ;
Interaction and multiscale mechanics, volume 5, issue 2, 2012, Pages 105~114
DOI : 10.12989/imm.2012.5.2.105
The study of rigid roadway pavement under dynamic traffic loads with variable velocity is investigated in this paper. Rigid roadway pavement is modeled as a rectangular damped orthotropic plate supported by elastic Pasternak foundation. The boundary supports of the plate are the steel dowels and tie bars which provide elastic vertical support and rotational restraint. The natural frequencies of the system and the mode shapes are solved using two transcendental equations, obtained from the solution of two auxiliary Levy's type problems, known as the Modified Bolotin Method. The dynamic moving traffic load is expressed as a concentrated load of harmonically varying magnitude, moving straight along the plate with a variable velocity. The dynamic response of the plate is obtained on the basis of orthogonality properties of eigenfunctions. Numerical example results show that the velocity and the angular frequency of the loads affected the maximum dynamic deflection of the rigid roadway pavement. It is also shown that a critical speed of the load exists. If the moving traffic load travels at critical speed, the rectangular plate becomes infinite in amplitude.
Numerical investigation of mechanical properties of nanowires: a review
Gu, Y.T. ; Zhan, H.F. ; Xu, Xu ;
Interaction and multiscale mechanics, volume 5, issue 2, 2012, Pages 115~129
DOI : 10.12989/imm.2012.5.2.115
Nanowires (NWs) have attracted intensive researches owing to the broad applications that arise from their remarkable properties. Over the last decade, immense numerical studies have been conducted for the numerical investigation of mechanical properties of NWs. Among these numerical simulations, the molecular dynamics (MD) plays a key role. Herein we present a brief review on the current state of the MD investigation of nanowires. Emphasis will be placed on the FCC metal NWs, especially the Cu NWs. MD investigations of perfect NWs' mechanical properties under different deformation conditions including tension, compression, torsion and bending are firstly revisited. Following in succession, the studies for defected NWs including the defects of twin boundaries (TBs) and pre-existing defects are discussed. The different deformation mechanism incurred by the presentation of defects is explored and discussed. This review reveals that the numerical simulation is an important tool to investigate the properties of NWs. However, the substantial gaps between the experimental measurements and MD results suggest the urgent need of multi-scale simulation technique.
Radial basis function collocation method for a rotating Bose-Einstein condensation with vortex lattices
Shih, Y.T. ; Tsai, C.C. ; Chen, K.T. ;
Interaction and multiscale mechanics, volume 5, issue 2, 2012, Pages 131~144
DOI : 10.12989/imm.2012.5.2.131
We study a radial basis function collocation method (RBFCM) to discretize a coupled nonlinear Schr
dinger equation (CNLSE) that governs a two dimensional rotating Bose-Einstein condensate (BEC) with an angular momentum rotation term. We exploit a RBFCM-continuation method (RBFCM-CM) to trace the solution curve of the CNLSE. We compare the performance of the RBFCM-CM with the FEM-CM. We observe that the RBFCM-CM is very robust in a coarse grid for resolving the ground state solution with many vortices when the angular momentum rotation is close to the limit. Numerical results demonstrate the efficiency and accuracy of the RBFCM-CM for computing the superfluid density of the ground level of the BEC.
The Application of welding numerical simulation on two typical welded structures in railway vehicles
Ya-na, Li ; Cheng-tao, Li ; Bin, Yuan ; Su-ming, Xie ;
Interaction and multiscale mechanics, volume 5, issue 2, 2012, Pages 145~155
DOI : 10.12989/imm.2012.5.2.145
The thin-plate structure and the box-beam structure are two typical welded structures in railway vehicles. Because of their structure complexity, bigger size and multi-seams, welding residual distortion which occur in welding process bring unfavorable effect on the quality of welding products manufacturing and service. As a result, welding distortion forecasting and control become an important and urgent research topic in railway vehicles. In this paper, three different numerical methods are presented corresponding to three typical types of welded structures of railway vehicles and welding deformation are simulated. Consistence of numerical results and experimental data proves the correctness of models and feasibility of simulation methods.
The dilatancy and numerical simulation of failure behavior of granular materials based on Cosserat model
Chu, Xihua ; Yu, Cun ; Xu, Yuanjie ;
Interaction and multiscale mechanics, volume 5, issue 2, 2012, Pages 157~168
DOI : 10.12989/imm.2012.5.2.157
The dilatancy of granular materials has significant influence on its mechanical behaviors. The dilation angle is taken as a constant in conventional associated or non-associated flow rules based on Drucker-Prager yields theory. However, various experimental results show the dilatancy changes during progressive failure of granular materials. A non-associated flow rule with evolution of dilation angle is adopted in this study, and Cosserat continuum theory is used to describe the behaviors of granular materials for considering to some extent the its internal structure. Numerical examples focus on the bearing capacity and localization of granular materials, and results illustrate the capability and performance of the presented model in modeling the effect on failure behavior of granular materials.