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论文类型：期刊论文

发表时间：2018-04-01

发表刊物：EXTREME MECHANICS LETTERS

收录刊物：SCIE、EI

卷号：20

页面范围：81-90

ISSN号：2352-4316

关键字：Porous soft materials; Instability; Finite element analysis; Pattern transformation

摘要：In this work, we combine both experiments and numerical simulations to study the large deformation mechanics of two-dimensional patterned porous silicone rubber under biaxial loading, by focusing on the combined compressive and tensile loading. Particularly, we design a loading apparatus to impose the biaxial loading and fabricate patterned porous silicone rubbers through 3D printing. Although the pattern transformation with alternating elliptic voids has been observed under uniaxial compression before, our results show that the pattern transformation can be promoted by biaxial compression, while biaxial compression/ tension can delay it. When the ratio between tension and compression is larger than a critical value, a new pattern transformation has been observed. In addition, if the imposed tension in one direction is larger than the compression in the other direction, the pattern transformation with alternating elliptic voids cannot occur. Biaxial loading provides new opportunities to fabricate the tunable devices and imprint complex patterns with soft solids. (c) 2018 Elsevier Ltd. All rights reserved.