Mingchao Cai, Chun Yang, Mehmet H. Kural, Richard Bach, David Muccigrosso, Deshan Yang, Jie Zheng, Kristen L. Billiar, Dalin Tang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 97-104, 2011, DOI:10.3970/icces.2011.019.097

Abstract Image-based computational modeling has been introduced for vulnerable atherosclerotic plaques to identify critical mechanical conditions which may be used for better risk assessment and rupture predictions. In vivo patient-specific coronary plaque models are lagging due to limitations on non-invasive image resolution, flow data, and vessel material properties. We propose a procedure where intravascular ultrasound (IVUS) imaging, biaxial mechanical testing and computational modeling are combined together to acquire better and more complete plaque data and make more accurate plaque vulnerability assessment and predictions. More >

R. Muhammad*, A. Maurotto, M. Demiral, A. Roy and V.V. Silberschmidt

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 95-96, 2011, DOI:10.3970/icces.2011.019.095

Abstract Analysis of the cutting process in machining of modern engineering materials (Ti- and Ni-based alloys), which are hard-to-cut materials, is a challenge that needs to be addressed. Machining of these alloys with conventional techniques is difficult and often results in tool failure due to the high cutting forces imposed on the tool. In a machining operation, cutting forces causes severe deformations in the proximity of the cutting edge, producing high stresses, strain, strain-rates and temperatures in the workpiece.
Ultrasonically assisted turning (UAT) is an advanced machining process, which has shown several advantages especially in the machining of high strength… More >

Ralph H. Scheicher

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 93-94, 2011, DOI:10.3970/icces.2011.019.093

Abstract The purpose of this talk is to provide an overview of the most recent theoretical studies undertaken by us in the field of hydrogen storage materials research. On selected examples, the application of our computational tool of choice, density functional theory, will be illustrated to show how ab initio calculations can be of use in the effort to reach a better understanding of hydrogen storage materials and to occasionally also guide the search for new promising approaches. Systems to be discussed include: Metal-organic frameworks, where we have studied hydrogen physisorption in three different types of iso-reticular MOFs, namely Zn-/Mg-/Ca-MOF16, decorated… More >

Janusz Badur, MichaA, Karcz, Marcin LemaA"ski, Lucjan NastaA,ek

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 91-92, 2011, DOI:10.3970/icces.2011.019.091

Abstract Due to last mass flow rate measurements in gas micro and nano-channels several discrepancies in the mathematical modeling have been arise. The most important one, is the "flow enhancement" related with the wall slip phenomena. Thus, in the literature, there is opinion that the Navier-Stokes slip condition is correct only in certain restricted circumstances, particularly those restricted to the first order boundary conditions. A one possible way for solving of the above discrepancies, used recently in the literature, is developing a variety of so-called ßecond order boundary conditions". This way is incorrect since it always leads to an inconsistency between… More >

Qiang Wang, Tie Liu, Yin Liu, Yi Yuan, Jicheng He

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 89-90, 2011, DOI:10.3970/icces.2011.019.089

Abstract Recently, the application of high magnetic fields to materials processing is considering a promising approach to prepare functional materials with special performances. In the present study, based on the techniques of solidification, quenching, and isothermal annealing in both the semisolid and melting states in high magnetic fields, the solidified structure evolution of the Mn-Sb and Al-Ni alloy systems was systematically studied under different magnetic field conditions. A novel method was proposed to in situ fabricate the graded or aligned materials using gradient or uniform high magnetic fields. The results show that the primary MnSb particles were gathered in one certain… More >

Li Shan, Ming Cheng, Kaixin Liu

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 87-88, 2011, DOI:10.3970/icces.2011.019.087

Abstract In the present paper, a combined scheme of discrete element method (DEM) and meshless method for numerical simulation of impact problems is proposed. Based on the basic principle of continuum mechanics, an axisymmetric DEM framework is estabilished for modeling the elastoplastic behavior of solid materials. A failure criterion is introduced to model the transformation from a continuum to a discontinuum. The friction force between contact elements is also considered after the failure appears. So our scheme can calculate not only the behavior of continuum and discontinuum, but also the transformation process from continuum to discontinuum. In addition, a meshless interpolation… More >

Hui Han, Yi Wah Mak, Wei Huang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 85-86, 2011, DOI:10.3970/icces.2011.019.085

Abstract The root of Salvia miltiorrhiza bunge, Danshen, is a traditional Chinese herb known to prevent hypertension. However, the mechanism of how Danshen affects the mechanical properties of blood vessel is not clear. In this project, we studied the effects of Danshen on zero-stress state of rat's abdominal aorta, which is the basic configuration of blood vessel affected solely by intrinsic parameters.
Sprague Dawley rats, male, around 350g, were used. The zero-stress state of a blood vessel can be very different from the in vivo state and the no-load state of the vessel. At the in vivo state, the rat's… More >

A. Takayama, S. Saito, A. M. Ito, S. Yonemura, H. Nakamura

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 83-84, 2011, DOI:10.3970/icces.2011.019.083

Abstract We have been developing a molecular dynamics (MD) simulation code, a binary collision approximation (BCA) based simulation code, and a BCA-MD hybrid simulation code. In this paper, an overview of the codes is presented. BCA-based simulation results of hydrogen isotopes injection into graphite target are also shown. Detailed description is given as a full abstract. More >

Victor A. Eremeyev

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 81-82, 2011, DOI:10.3970/icces.2011.019.081

Abstract The aim of this work is to discuss the nonlinear theory of shells made of material undergoing phase transitions (PT). The interest to mechanics and thermodynamics of thin-walled structures with PT is motivated by the recent investigations of thin martensitic films and biological membranes. Here we present statements of the boundary-value problems of shells and plates with PT within the dynamically and kinematically exact theory of shells. In this shell theory the translation and rotation fields are the kinematically independent variables. The theoretical model is illustrated by the examples of thin circular cylindrical shell and circular plate made of two-phase… More >

Du Qinghai, Cui Weicheng, Wang Yongjun

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 79-80, 2011, DOI:10.3970/icces.2011.019.079

Abstract The spherical shell is a typical form of revolution shells, which is widely used in pressure vessel and piping industry, nuclear power industry and ocean engineering for its specific structural shape to obtain kinds of performance. However compared to the cylindrical or conical shell, the spherical shell is mainly used as main structure or pressure hull in underwater engineering because of the superiority of theoretical solution and its manufacture. For the significance of the spherical shell, many researchers in the region of engineering and mechanics have spent great efforts to solve it and do lots of experiments in order to… More >