異種材料同径二球の向心直衝突(機械力学,計測,自動制御)

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The impacts between structural elements are often happened in engineering applications. There are many types of impacts in such situations. Among them, direct central impacts between two spheres are one of the most basic impact configurations. So far, several expressions for the coefficient of restitution have been proposed by K.L. Johnson, W.J. Stronge, C. Thornton, but they mainly focused on the impacts between two spheres made of same materials. This paper investigates the influence of material dissimilarity on the impact properties in detail. The experiments between spheres made of aluminum and steel were conducted. Then the numerical simulations have been carried out by using Finite Element Method. The results were compared between the experiments and simulations and they agreed well. In the present study, the deformation concentrated on the aluminum sphere. Further, the profile of the contact surface became concave. For the impact between spheres made of dissimilar materials, the concept of composite coefficient of restitution has been successfully applied to several experimental results so far. According to the composite coefficient, the coefficient of restitution for the dissimilar materials should take the intermediate value between those for the same materials. However, the coefficient of restitution for the dissimilar impact was lower than those of the same materials in the present study. It is thought that this discrepancy is caused from the assumption of flat contact surface in the composite coefficient of restitution, while it was concave as seen in the results of this paper.
2010-08-25

異種材料同径二球の向心直衝突(機械力学,計測,自動制御)

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