鲨鱼皮微沟槽结构复制技术研究

表面具有大量微沟槽结构的鲨鱼皮具有良好的减阻效果,因此鲨鱼皮复制技术成为国内外减阻技术研究的热点之一.以鲨鱼表面微小盾鳞结构为复制模板,采用热压成型法和真空浇注法,分别在有机玻璃和不饱和树脂表面进行微结构复制,同时利用触针式轮廓仪和体视显微镜对不同材料和复制方法制备的仿生鲨鱼皮进行了对比分析.结果表明:相对于热压成型法,不饱和树脂作为复制模具材料,采用真空浇注法复制的液态硅橡胶仿鲨鱼皮,具有清晰完整的鲨鱼皮微沟槽结构,是一种较为可行的大面积高精度复制鲨鱼皮微沟槽的方法.

Study of replicated technology of micro-riblets on shark skin

It has been proved that micro-riblets on shark skin can help to reduce drag.Therefore,the replicated technology of micro-riblets on shark skin becomes one issue in drag-reduction field.Shark skin with micro-placoid scale was taken as the replicated template,and hot embossing method and vacuum casting method were applied to studying the replicated technology on plexiglass and unsaturated resin.The replication samples made by different materials and methods were observed and measured by the stereomicroscope and the stylus profiler.The experimental results show that compared with the hot embossing,the vacuum casting is a relatively perfect method for micro-riblets replication,which uses the unsaturated resin as mold material and casts the liquid silicone rubber under vacuum,micro-riblets on shark skin surface are replicated clearly and perfectly.It is found that the vacuum casting is an effective replication technology which is suitable to form large-area and highly accurate micro-riblets.