Scale and size effects on the mechanical properties of bioinspired 3D printed two-phase composites
Scale and size effects on the mechanical properties of bioinspired 3D printed two-phase composites
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DOI：
10.1016/j.jmrt.2020.10.052
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发表时间：
2020-11-01
影响因子：
6.4
通讯作者：
McKittrick, Joanna
中科院分区：
文献类型：
--
作者：
Su, Frances Y.;Sabet, Fereshteh A.;McKittrick, Joanna
多材料3D打印为新型建筑复合材料的制造提供了设计灵活性，并已越来越多地被用于探索生物启发复合材料的力学性能。在本研究中，探讨了尺度和尺寸对具有不同刚性相和软相结构的周期性两相复合材料力学性能的影响。所研究的复合材料包括具有两个连续相(受骨骼启发)的互穿相复合材料、具有连续相和不连续相的基质-夹杂复合材料以及两相都不连续的不连续相复合材料。这些复合材料是通过加法制造而成的，它们的力学性能通过数字图像相关的压缩试验进行了实验评估，并通过有限元分析进行了数值计算。总体趋势表明，随着规模的增大，材料的弹性模量和屈服强度减小。我们关于尺寸效应的结果表明，随着样品尺寸的增加，弹性模量和屈服强度都会增加。我们的研究结果有助于更好地了解添加制造复合材料研究和应用中的一些挑战，并有助于揭示尺度和尺寸效应对3D打印两相复合材料力学性能的影响。本文阐明了进一步研究添加制造材料中的尺度和尺寸效应的必要性。(C)2020作者。爱思唯尔出版公司(Elsevier B.V.)
Multi-material 3D printing offers design flexibility for the manufacture of new architectured composite materials and has been increasingly used to explore the mechanical properties of bioinspired composites. In this study, the influence of scale and size on mechanical properties of periodic two-phase composites with various architectures of a stiff and a soft phase are explored. The studied composites include an interpenetrating phase composite with two continuous phases (inspired by bone), a matrix-inclusion composite with a continuous and a discontinuous phase, and a discontinuous phase composite where both phases are discontinuous. These composites are fabricated by additive manufacturing, and their mechanical properties are evaluated experimentally using a compression test complemented by digital image correlation, and numerically through finite element analysis. Overall trends show that the elastic moduli and yield strengths decrease as the scale is increased. Our results on size effects reveal an increase in elastic modulus and yield strength with increasing size of the sample. Our investigation outcomes help to better understand some of the challenges in studying and applications of additively manufactured composites and shed light on scale and size effects on mechanical properties of 3D printed two-phase composites. This paper illustrates a need for further studies of scale and size effects in additively manufactured materials. (C) 2020 The Authors. Published by Elsevier B.V.