We suggest a novel experimental technique to fabricate microscale metallic wrinkles on a curved surface to clear duplication of form using a contact and electro-replication process. As the first step, in order to fabricate polymeric master wrinkle patterns, a UV-curable adhesive was deposited on a substrate with 180 μm in thickness, and then it was weakly polymerized by short UV exposure of 5 s for generating the gradient of material properties along the direction of layer thickness. Then, wrinkles were generated on a skin of the weakly polymerized layer by compressive forces that occurred during a thermal post-processing. After that, the master was replicated using a PDMS mold. The metallic wrinkles were reproduced on a curved metallic surface using the replicated mold in a nickel-based electroforming system. For understanding the major process parameters of electro-replication, a Taguchi method was utilized. Through this work, the metallic wrinkles were well reproduced and we believe that the proposed method is a promising technology to fabricate metallic wrinkles that have rich potential applications such as heat transfer enhancement and surface modification of metallic structures.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: Mar 9, 2017
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