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The Influence Analysis of Stiffness on Stringer Layout and Dimension of Full Composite Wing Sheng-jun QIAO, Hang-shan GAO, Fu-sheng WANG, Zhu-feng YUE Department of Engineering Mechanics, Northwestern Polytechnical University, Advanced Material Testing Center, Xi′an 710129, China Email: qiaoshengjun123@163.com Key words: Composite; Stiffness; Stringer; Layout; Dimension Abstract: The present study aimed at obtaining torsional stiffness, bending stiffness and stiffness center position of full composite wing using thin wall structure mechanics theory.
Acknowledgements This study is supported by the National Natural Science Foundation (No: 51175424), the 111 Project (No: B07050) and the Basic Research Foundation of Northwestern Polytechnical University (No: JC201238).
Corresponding author Sheng-jun QIAO, Dr., Tel: +86 29 88431002, Fax: +86 29 88431002, E-mail address: qiaoshengjun123@163.com References [1] M Abdo, R L Heureux, F Pepin and F Kafyeke: CASI 16th Aerospace structures and materials symposium, Montreal, Quebee (2003)
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The structural optimization can be classified into the following three classes: (1) The topological optimization was the first one [ 7-8]; (2) The second was the parameter optimization[1-5] where the parameters of structures, such as the used material constants (Young’s modulus E, mass density ρ), cross sectional parameters (moment of inertia, torsional constant, height, width, and thickness), can be taken as the design variables, and a minimum weight the objective function with the given constrains; (3) The third was the shape optimization in which the geometry of the structure is varied to obtain the optimal shape[6-8].
The structural parameters are given as follows: the length is 5m, the width is 4m, and the height is 6m; the initial thickness of shell is, the Young’s modulus of the used material is Pa; the four columns of the bunker are fixed on the ground.
Fig.4 Layout of stiffeners after layout optimization Fig.5 The stress and the displacement of the bunker (14) After 35 iterations of the DFP method, the mass of the bunker reduce form to , save material 22.6% as Fig 8, the maximum of stress of the structure is . maximum of displace in X direction is; maximum of displace in Y direction is .
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Interval target have multilayer, sunder armor play every through a layer of consumption of energy, also leave gaps between each layer, can fill materials or use of the air.
The experimental device Figure 1 shows the experimental device, the interval value of depth is 100 mm; The thickness of the steel plate material is A3 steel, each layer is 4 mm.
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Bioleaching is technology applicable to iron extraction from low-grade non-metallic raw materials.
The feasibility of the bioleaching treatment has to be tested specifically to each type of silicate raw materials.
may have influence Fe chemistry in these non-metalic raw materials.
The feasibility of the bioleaching treatment has to be tested specifically to each type of silicate raw materials.
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European Journal of Social Sciences 14(1), pp. 98-108 In the opinion of authors indicating the learning organizations in the context of the implementation of high-tech IT solutions in companies is exceptionally justified, since strong causal relation between the organizational culture of contemporary companies and the course of the process of the implementation of changes exists.
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Model of framework is out of relation with load but is determined by trait itself and material, so disk spring only was restrict without load.
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The physical models of manufacturing resources include two aspects, namely the model that is consist of the material elements of manufacturing resources and the model of organizational structure of manufacturing resources, as shown in Fig. 1.
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Acknowledgement This research is supported by the National Natural Science Foundation of China (No. 51305003) and the key Foundation of Anhui province of China for Outstanding Young Teachers in University (No. 2012SQRL045ZD ).
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The serialized sculptures, theme sculptures or ornamental sculptures set continuously at both sides use different materials and manifestation modes to make the whole avenue generate a continuous visual impact effect.
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