Zhi Sun, Yuxiong Yan

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 117-118, 2011, DOI:10.3970/icces.2011.019.117

Abstract Tower crane is the most generally used construction equipment for civil engineering structures. This paper proposes a method on dynamic modeling and vibration response analysis for high-rise tower cranes in operation. Concerning that tower crane structure is a beam-like lattice structure; a continuum modeling technique is firstly proposed to model the tower crane segment as a box girder element. The modeling based on this element will greatly reduce the number of degrees of freedom for tower crane dynamic analysis and thus improve analyzing efficiency. Based on the equivalent beam model, dynamic response of the tower More >

V.K. Tewary

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 113-114, 2011, DOI:10.3970/icces.2011.019.113

Abstract Interfacial region between two nanomaterials can be treated as a separate material since its atomistic structure and characteristics are different than the two materials on its either side. The mechanical as well as electronic properties of composite materials are sensitive to the interfaces. For industrial application of the nanomaterial systems, it is vital to model and measure the discrete atomistic locations in the interface during operating conditions. As the dimensions of nanomaterial systems shrink, the role of interfaces become increasingly important. Because of its nanothickness, the conventional characterization and design parameters like elastic constants, stress… More >

Yan Wang¹, Weina Li¹, Jorg Weissmoller^2,3, Huiling Duan¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.4, pp. 117-118, 2011, DOI:10.3970/icces.2011.018.117

Abstract Surface stress plays a very important role in surface morphology evolution [1-3]. Since the bonding configurations of the atoms at surfaces become different when adsorbates are situated on the surfaces, surface stress can be altered by the presence of adsorbates. Moreover, unless experiments are carried out on high quality single crystals, the surface will typically exhibit corrugation or roughness even when it is nominally planar. We have analyzed this kind of problem and pointed out that stress can be quite significantly affected by surface roughness when the microstructure scale reaches the nanometer range [4].

Therefore, More >

George Fitzgerald, Michael Doyle

The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 1-2, 2011, DOI:10.3970/icces.2011.017.001

Abstract Molecular modeling can provide a detailed understanding of structures, properties, and processes for materials as diverse as organic molecules, polymer blends, or alloys. Yet, these methods have generally been restricted to length scales of 100 nm and time scales of 10^-6 seconds, which limits their usefulness for research problems on the engineering scale. In this work, we discuss several approaches for extending their domain of applicability to the macro-scale.

Enhancements to atomistic modeling methods make it possible to apply accurate atomistic models to problems in electronics materials, alloys, and polymers. Statistical methods such as Quantitative Structure-Activity More >

Linggang Kong, Yunmin Chen, Yanguo Zhou, Jianqun Jiang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 107-108, 2011, DOI:10.3970/icces.2011.020.107

Abstract To investigate geotechnical systems, high gravity is needed due to the dominance of material self-weight. A centrifuge is a common technique to generate high gravity, which causes centrifugal acceleration. In geotechnical physical modeling, geotechnical centrifuge can generate the same gravity stress as the prototype, guarantees the consistency of model deformation and failure mechanism between the centrifugal model and real objects and solve complex problems in geotechnical engineering, hydraulic engineering and environmental engineering etc. In view of the scientific values of centrifuge and shaking table, Zhejiang University develops one of the largest geotechnical centrifuges in China.… More >

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 >

Duning Li, Yufeng Niei?a, Xuemei Zhou, Li Cai

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 75-76, 2011, DOI:10.3970/icces.2011.019.075

Abstract In this study, the efficient discrete model including the resin infusion and the fiber compaction is developed to simulate the RFI (resin film infusion) process. The non-linear governing equations are derived by the Darcy's law, the Terzaghi's law and the continuity equations. The finite element method and the finite difference method are used to discretize the proposed equations, and the VOF method is used to track the filling front. Compared with the analytical results of Park, our numerical results agree well with them. Furthermore, we analyze the RFI process of BMI/G0814, and simulate the resin More >

Sanghyun Shim, Kwangjin Kim, Sangchul Lee, Sangho Ko, Jayoung Kang, Dongyoung Rew, Gwanghyeok Ju

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 73-74, 2011, DOI:10.3970/icces.2011.019.073

Abstract The aim of this paper is to discuss the main issues related to modeling and simulation of the Korean lunar module. Lunar module usually consists of a rigid platform, attitude control actuators and a fuel tank. For dynamical modeling, we first assumed the lunar module as a rigid body and derived equations of motion by considering allocation of reaction thrusters and reaction wheel assembly(RWA). Fuel sloshing in lunar module and its influence on attitude dynamics are an important issue in the research field of space technology. In order to include the effect of fuel sloshing More >

De-Shin Liu, Zhen-Wei Zhuang, Cho-Liang Chung

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.2, pp. 39-40, 2011, DOI:10.3970/icces.2011.019.039

Abstract A two-dimensional heterogeneous hybrid moisture element method (HHMEM) for modeling transient moisture diffusion in permeable fiber-reinforced polymer composites is proposed in this paper.
The HHMEM scheme is based on a heterogeneous hybrid moisture element (HHME), whose properties are determined by equivalent moisture capacitance and conductance matrixes calculated using the conventional finite element formulation with the similarity mass/stiffness property and matrix condensing operations. A coupled HHME-FE scheme is developed and implemented in computer codes MATLAB to analyze the transient moisture diffusion characteristics of polymeric composite materials containing multiple permeable fibers. The analysis commences by comparing the… More >

Yongzheng Ma, Hong Zheng

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.1, pp. 7-8, 2011, DOI:10.3970/icces.2011.019.007

Abstract The traditional Discontinuous Deformation Analysis (DDA) method, like other Discrete Element Methods, is created to model the discrete block system. The extended DDA method based on meshless interpolations means utilizing meshless interpolations, usually the Moving Least-Squares interpolations, to present block displacement field. In the new extensions here, the effects of earthquake, excavation and bolt reinforcement on the assemblages of large blocks are modeled: for modeling earthquake, the initial acceleration value from earthquake at certain DDA time step can be interpolated from the earthquake acceleration vs. time curve; the modeling of excavation is by reversing in-situ More >