| Citation: | WANG Yuan, ZANG Yong, GUAN Ben, et al. Equivalent stiffness property of dimpled sheet based on unit cell finite element[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(6): 1230-1238. doi: 10.13700/j.bh.1001-5965.2017.0698(in Chinese)
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To obtain the macroscopic stiffness property of the dimpled sheet and its relationship with surface morphology structure parameters, the unit cell finite element method finite element method was used to analyze the equivalent stiffness property of the dimpled sheet. Firstly, based on the periodic boundary conditions of unit cell finite element method, the equivalent stiffness of the dimpled sheet with periodic check board pattern was calculated. And then the equivalent stiffness of a specific dimpled sheet was analyzed and verified with the unit cell finite element method. Finally, the effects of structural parameters on the equivalent stiffness of the dimpled sheet were discussed. The analysis results show that with the unit cell finite element method the equivalent stiffness of dimpled sheet can be obtained. The dimpled sheet has higher bending stiffness but lower tension and shear stiffness compared with the base flat sheet. When base sheet's thickness is fixed, the bending stiffness increases as the thickness of dimpled sheet increases, while the tension stiffness and the shear stiffness decrease. As the periodic distance of dimpled sheet increases, the tension stiffness and the shear stiffness increase, while the bending stiffness decreases.
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