CMES-Vol. 10, No. 2, 2005

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BIOGRAPHICAL ITEM

Clifford J. Astill - In Memoriam
George K. Lea¹
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 97-98, 2005, DOI:10.3970/cmes.2005.010.097
Abstract This article has no abstract. More >

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Parallel Octree-Based Finite Element Method for Large-Scale Earthquake Ground Motion Simulation
J. Bielak¹, O. Ghattas², E.-J. Kim³
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 99-112, 2005, DOI:10.3970/cmes.2005.010.099
Abstract We present a parallel octree-based finite element method for large-scale earthquake ground motion simulation in realistic basins. The octree representation combines the low memory per node and good cache performance of finite difference methods with the spatial adaptivity to local seismic wavelengths characteristic of unstructured finite element methods. Several tests are provided to verify the numerical performance of the method against Green's function solutions for homogeneous and piecewise homogeneous media, both with and without anelastic attenuation. A comparison is also provided against a finite difference code and an unstructured tetrahedral finite element code for a simulation of the 1994 Northridge… More >

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Tsunami Propagation from a Finite Source
George F. Carrier¹, Harry Yeh²
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 113-122, 2005, DOI:10.3970/cmes.2005.010.113
Abstract Sea-bottom displacements associated with seismic events are confined largely to strips of large but finite aspect ratio. We analyze waves that are initiated on such a strip and that propagate across a region of finite depth. We invoke the classical shallow-water-wave theory to obtain rather comprehensive descriptions of the non-dispersive aspects of the waves. The directivity of the energy radiation and the domain of pulse persistence are discussed. More >

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Issues in Modeling Heterogeneous Deformations in Polycrystalline Metals using Multiscale Approaches
Paul R. Dawson¹, Donald E. Boyce², Ronald Rogge³
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 123-142, 2005, DOI:10.3970/cmes.2005.010.123
Abstract Computational mechanics provides a powerful environment for modeling the evolution of material structure during deformation processes and for associating that evolution with changes to the mechanical properties. In this paper, we illustrate a two-scale formulation that links the mechanical loading applied at the scale of a component (the continuum scale) to the responses of the material at the scale of the crystals that comprise it (the crystal scale). Employing the capabilities offered by computational mechanics, we can better understand how heterogeneity of deformation arising at both the continuum and crystal scales influences the behaviors observed experimentally. Such an understanding is… More >

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Advances in Computational Methods for Multibody System Dynamics
R.L. Huston¹, C.-Q. Liu²
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 143-152, 2005, DOI:10.3970/cmes.2005.010.143
Abstract This paper presents a summary of recent developments in computational methods for multibody dynamics analyses. The developments are presented within the context of an automated numerical analysis. The intent of the paper is to provide a basis for the easy development of computational algorithms. The principal concepts discussed are: differentiation algorithms, partial velocities and partial angular velocities, generalized speeds, Euler parameters, Kane's equations, orthogonal complement arrays, lower body arrays and accuracy testing functions. More >

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Stick-Slip-Slap Interface Response Simulation: Formulation and Application of a General Joint/Interface Element
Yaxin Song¹, D. Michael McFarland¹, Lawrence A. Bergman¹, Alexander F. Vakakis²
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 153-170, 2005, DOI:10.3970/cmes.2005.010.153
Abstract A general interface element is developed for dynamic response analysis of structures with jointed interfaces, which can account for damping due to both impact and friction. Contact effects are included through a segment-to-segment contact model which considers the stick-slip-slap behavior at every point along the joint interface. A nonlinear friction law is adopted at the interface to describe microscopic relative motion due to the deformation of the asperities on the interface. Numerical examples demonstrate that the general joint interface element is capable of accounting for both friction and impact damping in jointed interfaces, as well as capturing the transfer of… More >

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A Numerical Investigation of Boumerdes-Zemmouri (Algeria) Earthquake and Tsunami
Xiaoming Wang¹, Philip L.-F. Liu¹
CMES-Computer Modeling in Engineering & Sciences, Vol.10, No.2, pp. 171-184, 2005, DOI:10.3970/cmes.2005.010.171
Abstract On May 21, 2003 Boumerdes-Zemmouri (Algeria) earthquake generated a small tsunami, which was recorded at several locations around the coast of Balearic Islands, Spain. Recent field studies (Meghraoui, et al., 2004) and teleseismic wave analysis (Yiga, 2003) indicated that the earthquake magnitude is stronger than that suggested by the Harvard CMT solution. Moreover, the seafloor displacement is also not uniform along the rupture line. In this paper, we perform a numerical investigation to evaluate the accuracy of various suggested fault plane mechanisms. The numerical model is based on the shallow-water equations and numerical results are compared with the measured wave… More >

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