Revisiting the micro-buckling of carbon fibers in elastic memory composite plates under pure bending
Revisiting the micro-buckling of carbon fibers in elastic memory composite plates under pure bending
复制标题
重新审视纯弯曲下弹性记忆复合板中碳纤维的微屈曲
DOI：
10.1016/j.ijmecsci.2017.12.018
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发表时间：
2018
影响因子：
7.3
通讯作者：
Liang Xiaoyan
中科院分区：
文献类型：
--
作者：
Zhang Jiamei;Dui Guansuo;Liang Xiaoyan
弹性记忆复合材料（EMC）是由碳纤维嵌入形状记忆聚合物（SMP）基体中而形成的，在空间可展开结构中受到广泛关注。它们被包装成高得多的折叠曲率的有利能力是由于软SMP基质允许纤维微弯曲而不断裂。本文研究了在纯弯曲条件下，纤维嵌入EMC薄板在有限应变下的屈曲力学。利用能量法确定了三个关键参数的解析表达式，即中性应变面和临界屈曲面的位置以及屈曲纤维的半波长。将纤维模拟为三维线弹性体，考虑了纤维尺寸对基体剪切应变的影响。并与不考虑纤维尺寸效应的结果进行了详细的讨论和比较。结果表明，考虑纤维尺寸效应对半波长有影响，能合理预测模型的适用范围，但对中性应变面和临界屈曲面位置的变化趋势影响不大。
Elastic memory composites (EMCs) consisting of carbon fibers embedded in a shape memory polymer (SMP) matrix are receiving substantial interests in deployable space structures. Their favourable ability to be packaged to a much high folding curvature is due to that the soft SMP matrix allows the fibers to micro-buckle without breaking. This paper studies the buckling mechanics of fibers embedded in a thin EMC plate at finite strain under pure bending. The analytical expressions of three key parameters, namely the locations of neutral strain surface and critical buckling surface, the half-wavelength of buckling fibers, are determined by energy method. The fiber is modeled as 3D linear elastic solid, and its size effect on the shear strain of matrix is considered. Detailed discussions and comparisons are provided between the results obtained from this work and the ones without considering the fiber size effect. It is shown that considering the size effect of fibers has an influence on the half-wavelength and could reasonably predict the scope of the model, but it produces little differences on the variation trend of locations of neutral strain surface and critical buckling surface.