Effects of periodic sequential arrangement of subscale miura-foldcore under quasi-static compression

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Chase Mortensen, Devin Nielsen, Syed Zulfiqar Hussain Shah, Juhyeong Lee
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Abstract

This study presents experimental and numerical investigations on the quasi-static compressive responses of various subscale Miura-foldcore composites. A series of quasi-static compression tests were conducted on standard Miura foldcore specimens fabricated using carbon/epoxy woven fabric prepregs. Representative volume element (RVE) models, incorporating periodic boundary conditions (PBCs), were developed to predict the size-dependent compressive response of subscale Miura foldcores. The effective properties of the carbon/epoxy woven fabric composite used in this study were calculated using the NASA multiscale analysis tool (NASMAT) via two-step homogenization process. The FE model exhibited comparable agreement with experimental results, showcasing variations of less than 7% and 12% in maximum compressive load and compressive stiffness, respectively. The implementation of PBC in the foldcore RVE models improved modeling accuracy by <4%, but drastically increased total computational time (>50%). The periodic pattern of foldcore unit-cells, where two single foldcore unit-cells were placed in parallel or perpendicular, imposed geometric constraints, resulting in small variations in predicted stress and strain distribution contours. The key findings highlighted in this study suggest that a 1 × 1 foldcore unit-cell model without PBC is sufficient to predict accurate quasi-static compressive responses of foldcore composites. This study advances the understanding of subscale Miura-foldcore composites and provides valuable insights into the limitations associated with the use of PBC in foldcore RVE models. The findings also offer a practical guide for fabricating and analyzing traditional Miura folding patterns, promoting a more efficient and accurate approach for optimizing foldcore composite designs considering both structural performance and manufacturability.
准静态压缩条件下亚尺度 miura-foldcore 周期性顺序排列的影响
本研究通过实验和数值计算研究了各种小尺寸三浦折芯复合材料的准静态压缩响应。对使用碳/环氧编织物预浸料制作的标准三浦折芯试样进行了一系列准静态压缩试验。开发了包含周期性边界条件(PBC)的代表性体积元素(RVE)模型,以预测与尺寸相关的亚尺度 Miura 折叠芯的压缩响应。本研究中使用的碳/环氧编织物复合材料的有效特性是通过两步均质化过程使用 NASA 多尺度分析工具 (NASMAT) 计算得出的。有限元模型与实验结果相当吻合,最大压缩载荷和压缩刚度的变化分别小于 7% 和 12%。在折芯 RVE 模型中实施 PBC 后,建模精度提高了 50%)。折芯单元单元的周期性模式,即两个单折芯单元单元平行或垂直放置,施加了几何约束,导致预测的应力和应变分布轮廓变化较小。本研究强调的主要发现表明,不含 PBC 的 1 × 1 折芯单元单元模型足以准确预测折芯复合材料的准静态压缩响应。这项研究加深了人们对亚尺度三浦-折芯复合材料的理解,并就折芯 RVE 模型中使用 PBC 的相关限制提供了宝贵的见解。研究结果还为制造和分析传统的三浦折叠模式提供了实用指南,促进采用更高效、更准确的方法来优化折叠芯复合材料设计,同时考虑结构性能和可制造性。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
期刊介绍: ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.
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