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Simulation Analysis of Stress Field of Walnut Shell Composite Powder in Laser Additive Manufacturing Forming

Journal of Renewable Materials 2023年第1期11卷 333-347页

作者： Yueqiang Yu Tingang Ma Suling Wang Minzheng Jiang Yanling Guo Ting Jiang Shuaiqi Huang Ziming Zheng Bo Yan Jiyuan Lv College of Mechanical Science and Engineering Northeast Petroleum UniversityDaqing163318China College of Mechanical and Electrical Engineering Northeast Forestry UniversityHarbin150040China Research and Development Center of 3D Printing Material and Technology Northeast Forestry UniversityHarbin150040China

A calculation model of stress field in laser additive manufacturing of walnut shell composite powder(walnut shell/Co-PES powder)was *** DFLUX subroutine was used to implement the moveable application of a double ellipsoid heat source by considering the mechanical properties varying with *** stress field was simulated by the sequential coupling method,and the experimental results were in good accordance with the simulation *** addition,the distribution and variation of stress and strain field were obtained in the process of laser additive manufacturing of walnut shell composite *** displacement of laser additive manufacturing walnut shell composite parts gradually decreased with increasing preheating temperature,decreasing laser power and increasing scanning *** the cooling process,the displacement of laser additive manufacturing of walnut shell composite parts gradually increased with the increasing preheating temperature,decreasing scanning speed and increasing laser power.

关键词： Selective laser sintering agricultural and forestry wastes walnut shell stress field warping deformation

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Biomechanical behaviors of dragonfly wing:relationship between configuration and deformation

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Chinese Physics B 2012年第3期21卷 294-303页

作者：任淮辉王习术陈应龙李旭东 Department of Engineering Mechanics AMLTsinghua University

In this paper, the natural structures of a dragonfly wing, including the corrugation of the chordwise cross-section, the sandwich mierostructure veins, and the junctions between the vein and the membrane, have been investigated with experimental observations, and the morphological parameters of these structural features are measured. The experimental result indicates that the corrugated angle among the longitudinal veins ranges from 80° to 150°, and the sandwiched microstructure vein mainly consists of chitin and protein layers. Meanwhile, different finite element models, which include models I and I＊ for the planar forewings, models II and II＊ for the corrugated forewings, and a submodel with solid veins and membranes, are created to investigate the effects of these structural features on the natural frequency/modal, the dynamical behaviors of the flapping flight, and the deformation mechanism of the forewings. The numerical results indicate that the corrugated forewing has a more reasonable natural frequency/modal, and the first order up-down flapping frequency of the corrugated wing is closer to the experimental result （about 27.00 Hz）, which is significantly larger than that of the planar forewing （10.94 Hz）. For the dynamical responses, the corrugated forewing has a larger torsional angle than the planar forewing, but a lower flapping angle. In addition, the sandwich microstructure veins can induce larger amplitudes of torsion deformation, because of the decreasing stiffness of the whole forewing. For the submodel of the forewing, the average stress of the chitin layer is much larger than that of the protein layer in the longitudinal veins. These simulative methods assist us to explain the flapping flight mechanism of the dragonfly and to design a micro aerial vehicle by automatically adjusting the corrugated behavior of the wing.

关键词： aerodynamics corrugation warping deformation finite element analysis

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