Contact failure analysis of preloaded eccentric structures

DOI:	10.11809/bqzbgcxb2023.06.036
Keywords:	foam rubber; preload; contact separation; ellipsoid; eccentricity
Abstract:	In view of the contact failure caused by a foam rubber pad used in the preloaded assembly of the ellipsoid structure, this paper firstly analyzes the failure mechanism of contact separation on the cushion and the material constitutive model, and defines the failure separation criterion of the cushion preloading method and the constitutive model applicable to the foam rubber material. Then, finite element analysis models of spheroids with different eccentricities are established, and the first order modal frequencies of the structure are precomputed. Finally, sinusoidal vibration loads with different frequency amplitudes are applied to calculate and analyze the load threshold of contact separation on the pad contact surface, and the effects of eccentricity, load frequency and amplitude on pad contact failure are obtained. The simulation results show that, for the preloaded cushion containing ellipsoid structure of the same eccentricity, the larger the amplitude and frequency of the concentrated load over the center of mass, the more likely the contact separation failure is to occur. When the load is applied to the cushion structure with different eccentricities, the greater the eccentricity e is, and the greater the critical failure load will be. The results can provide data support for the stability study of eccentric cushion structures.
Issue:	Vol. 44 No. 6 (2023)
Published:	2023-06-28
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