期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 250, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2022.111711
关键词
Fiber composites; Soft materials; Finite deformations; Instabilities; Pattern formations; Buckling plane
类别
资金
- European Research Council (ERC) [852281-MAGIC]
The buckling behavior of soft 3D-fiber composites with varying microstructure periodicity is studied. The orientation of out-of-plane buckling is determined by material properties, volume fractions, and periodicity. A buckling configuration map is provided in the design-space, predicting that these instability patterns will enrich the design of deformation-controlled tunable materials.
We study the buckling of soft 3D-fiber composites (FCs) with varying in-plane microstructure periodicity. Through our experiments and simulations, we find that the out-of-plane buckling orientation of fibers is determined by the constituent material properties, volume fractions, and the in-plane periodicity. The examples are given for the FCs with rectangular in-plane arrangement of fibers, i.e., the fibers are periodically situated at distance a from each other in one principal direction and distance b along the other principal direction (b > a). We provide a buckling configuration map in the design-space of geometric parameters (fiber volume fraction and in-plane periodicity aspect ratio, b/a). Pre-determined by the microstructure parameters, the fibers buckle towards (i) the first principal direction along which the fibers are closer to each other, or (ii) the second principal direction, or (iii) towards a non-principal direction. Furthermore, we find that the characteristics of the buckling plane map is governed by the shear modulus contrast between the phases of FCs. We anticipate that the distinct instability patterns reported here will enrich the design-space for building deformation-controlled tunable materials.
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