热塑性聚氨酯弹性体防水外壳的研究

Research on Thermoplastic Polyurethane Elastomer Waterproof Shell

针对现有橡胶件密封无法实现可拆卸与快速成型问题,利用现有的3D打印材料热塑性聚氨酯弹性体(TPU)并结合多层过盈联接薄壁圆筒结构设计了防水外壳模型,通过有限元分析软件Abaqus建立了防水外壳有限元轴对称模型,对外壳装配后的接触压力和应力以及径向位移的大小和分布进行分析。结果表明,以TPU为材料的多层过盈联接薄壁圆筒防水外壳的接触应力分布于4个纵向接触面上,接触应力最大值达到1.767 MPa,满足IP×7级防水接触应力要求。本研究为弹性元件密封结构的设计提供了新思路。

Aiming at the problem that the existing rubber seals can not be disassembled and rapidly prototyped,a waterproof shell model was designed using the existing 3D printing material thermoplastic polyurethane elastomer(TPU)combined with a multi-layer interference joint thin-walled cylindrical structure.The finite element axisymmetric model of the waterproof shell was established by the finite element analysis software Abaqus,and the contact pressure and stress as well as the magnitude and distribution of radial displacement were analyzed after the shell was assembled.The results showed that the contact stress of the multi-layer interference joint thin-walled cylinder waterproof shell made of TPU was distributed on four longitudinal contact surfaces,and the maximum contact stress reached 1.767 MPa,which met the contact stress requirements of IP×7 waterproofing.This study provided new ideas for the design of the elastic element sealing structure.