Analysis of the Dynamic Performance of the Cushion Material Composed of EPE and EPS Based on Finite Element Method

摘要

This paper analyzes the dynamic compression performance of the cushion material which is composed of EPE and EPS. The mechanical properties, the maximum acceleration and buffering coefficient of the cushion material are studied on FEM. The performance of the cushion material is analyzed quantitatively and qualitatively, the results show that: (1) The stress distribution of the cushion material and the stress are different if the arrangement mode of EPE and EPS is different. (2) When the stress area of the cushion material is added, the stress is mainly concentrated in EPS and at the contact point between EPE and the heavy hammer. And the stress area gradually becomes larger. (3) When the area percentage of EPS (D) is different, the stress distribution of the cushion material is not same. When D is greater than 81%, the stress is mainly concentrated in EPE. And EPE produces a deformation in the impact process. (4) With the increasing of static stress, the maximum acceleration and buffering coefficient first decreases, reaches its minimum, and then increases monotonously. When the static stress is equal to 0.00800 kg/cm~2, the maximum acceleration and buffering coefficient reach the minimum.