Papers by Keyword: Finite Element Analysis (FEA)

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Authors: Zhe Ji, Bin Liu, Fei Xu
Abstract: The solar-powered platform has great application prospects with its unique characteristics of high cruising altitude and long endurance. This paper presents a high-aspect-ratio long straight composite wing structure. A 3D FEM model is used to study the mechanical performance of the wing under gust, by applying nonlinear analytical method. The wing optimization is focused on high stiffness and light weight. A wing structure of feasible strength and stiffness is obtained. Through analysis, several engineering conclusions are obtained. In addition, the instability features of the main spar are included as well.
Authors: Abdul Malik Hussein Abdul Jalil, Wahyu Kuntjoro
Abstract: This paper describes the methodology to predict the stress level that occurs at the wing-fuselage lugs (joints). The finite element models of the wing, the wing lugs and the fuselage lugs were developed. Finite Element Analyses were performed using NASTRAN finite element software. CQUAD4 and BAR2 elements were used to represent the individual structures of the wing such as the ribs and stringers. The applied load was based on the symmetrical level flight condition. Once the load distribution acting at the wing had been calculated and applied, reaction forces at the nodes representing the wing lugs were obtained and these values applied to the lug models where the maximum stress value acting at the lugs was obtained.
Authors: Cengiz Erdönmez, C. Erdem Imrak
Abstract: Wire ropes are constructed by using both single and nested helical wires. Three-dimensional solid modeling of nested helical wires can be done by using parametric equations and needs special treatment. Wire strands are basic components of wire ropes and independent wire rope cores (IWRC) are special type of ropes, which are used as a core for complex wire ropes such as Seale IWRC or Warrington IWRC. Large tensile force strength of the wire ropes is very important in application areas where as the small bending and torsional stiffness. In this paper, modeling and analysis of a wire strand and IWRC are investigated in a realistic manner. In addition, contact interactions between wires in a strand are analyzed and finite element results are presented.
Authors: Kazuto Tanaka, Kohji Minoshima, Takehiro Imoto
Abstract: To analyze the effect of the crystal orientations and the grain size on the Young's modulus of thin polysilicon microelements, two-dimensional finite element models in plain strain condition were developed using a Voronoi structure. The number of grains in a model of a 10 μm square area was changed from 23 to 1200. The grain size and the crystal orientation of the film were analyzed by means of an electron back-scattering diffraction pattern (EBSP) method. The average grain size of the front surface of the thin film was about 0.69 μm, which is almost equal to the grain size of the Voronoi model having 300 grains. From the results of EBSP analysis, the specimen had no oriented structure. Therefore, random crystal orientation was given to each grain of the FEM models. When the number of grains increased, the Young's modulus converged on about 171 GPa and its scatter caused by the different sets of the random orientation was reduced. The Young's modulus obtained by the FEM analysis was larger than the value obtained by the tensile tests.
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