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K. Yamamoto¹, M. Tanaka¹, S. Tashiro¹, K. Nakata¹, K. Yamazaki², E. Yamamoto², K. Suzuki², A. B. Murphy³
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 1-6, 2008, DOI:10.3970/icces.2008.007.001
Abstract Authors have used a numerical model of stationary helium TIG arc welding taking into account the iron, chromium and manganese vapors produced from the weld pool surface and have simulated the distribution of the metal vapors, plasma temperature, fluid flow velocity and the formation of the weld pool. The concentration of manganese vapor in arc plasma was much higher compared with the composition of manganese for stainless steel. More >

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1004

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763

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K.K. Kratmann^1,3, M.P.F. Sutcliffe², L.T. Lilleheden³, O.T. Thomsen¹, R. Pyrz¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 7-12, 2008, DOI:10.3970/icces.2008.007.007
Abstract This paper concerns the quantification of fibre misalignment in unidirectional carbon fibre reinforced polymer composites (UD CFRP). The motivation for determining the fibre misalignment is described and existing applicable methods are presented. The concept of a newly developed image analysis procedure is described and the test procedures used to verify the robustness and precision of the method are presented along with selected results. More >

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968

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716

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B. J. Henz¹, D. R. Shires²
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 13-18, 2008, DOI:10.3970/icces.2008.007.013
Abstract The capability to predict the residual stresses induced during the manufacturing process in composite components is necessary for the timely fielding of new combat systems. At the U.S. Army Research Laboratory we have developed a computational environment to model the resin flow, heat transfer, curing, and residual stresses in composite components manufactured with the resin transfer molding (RTM) process. This computational environment uses object-oriented programming methods to provide model coupling capabilities and access to high performance computing assets. In this paper we will provide details of the physical models, software, and the validation/verification procedure used More >

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1076

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770

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Y. Adachi¹, F. Sako¹, S. Qinzhong², S. Ando², M. Tsuchihashi², I. Hagiwara³
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 19-22, 2008, DOI:10.3970/icces.2008.007.019
Abstract In this paper, the vibration response of the satellite equipment panel during the launch phase is predicted in consideration of the robustness. By using a simplified model consisted of a panel and an acoustic cavity, Monte Carlo simulation in which analytical parameters are changed at random in the conceivable range of variation is done. From the result, the acceleration power spectral density (PSD) of the satellite equipment panel is obtained. After statistical processing, the effect of variation on the vibration response is estimated and the proper design criteria of the equipment are defined. More >

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955

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789

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Iizuka Yoichiro¹, Hiroshi Yamaura
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 23-42, 2008, DOI:10.3970/icces.2008.007.023
Abstract Crown rollers are often used in the flexible media transport mechanism consists of a rubber layered roller and a steel roller. In this paper, the flexible media transport characteristics of crown roller is investigated theoretically. The purpose of this study is to analyze the flexible media transport characteristics such as longitudinal distribution of nip pressure, traction and transport velocity and so on, and to develop the design method of crown roller that has desired characteristics. More >

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1043

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807

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Peng Ni¹, Homer Walker¹
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 43-50, 2008, DOI:10.3970/icces.2008.007.043
Abstract One of the fundamental problems in electronic structure calculations is to determine the electron density associated with the minimum total energy of a molecular or bulk system. The total energy minimization problem is often formulated as a nonlinear eigenvalue problem. The most widely used algorithm for solving this type of problem is the self-consistent field (SCF) iteration accelerated by Direct Inversion on the Iterative Subspace (SCF-DIIS), in which a linearly constrained least-squares problem is embedded. We will examine and compare the numerical stability of three different ways to solve this least-squares problem. More >

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1050

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789

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A.Oba¹, Y.Fujii², M.Okuma³
The International Conference on Computational & Experimental Engineering and Sciences, Vol.7, No.1, pp. 51-56, 2008, DOI:10.3970/icces.2008.007.051
Abstract In this paper, the authors present a new evolutionary structural optimization method based on FE modeling using identical cubic elements for optimizing strength and dynamics characteristics of structures. The method is developed from the previous ones([1\hbox {}]-[3\hbox {}]), and carries out the size and topological shape optimization to satify the strength against external force and inertia force of itself and to control the natural frequencies of the structure. The method gives us the lightest structure satisfying the requirement about the strength and dynamic characteristics. The outline of the method is presented first, and a basic More >

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910

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692