Mechanics of Microspheres Reinforced Hollow Microcells
Mechanics of Microspheres Reinforced Hollow Microcells
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DOI：
10.1115/1.4049329
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
G. Youssef;Somer M. Nacy;Somer M. Nacy;N. Huynh
中科院分区：
文献类型：
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作者：
G. Youssef;Somer M. Nacy;Somer M. Nacy;N. Huynh
新兴的聚合物泡沫具有独特的微球壳微结构，增强致密的微球，为运动装备应用中的耐冲击泡沫衬垫创造了新的机会。本文描述了由外球面和均匀分布的微球组成的加筋微室的静力响应，同时量化了加筋效应。微球的分布是用傅立叶级数表示的，允许调整强化策略。推导了内外功的表达式，并采用里兹能量法计算了分布在一定范围内的压缩载荷引起的变形。重点讨论了微单元和增强微球的几何属性对变形响应和加筋效果的影响。该框架用于研究几个案例研究的响应，以阐明相对半径比，钢筋密度，微室壁厚度和加载配置对刚度的影响。引入了一种新的归一化应变能参数，以简化和加速分析，同时提供对观察到的屈曲响应基础的见解。结果强烈表明新发现的泡沫微观结构在管理静载荷方面的可行性，同时提供了使用本文提出的分析框架战略性地调整机械响应的机会。
Emerging polymeric foams exhibiting unique microstructure of microspherical shells with reinforcing dense microspheres creates a new opportunity for impact-tolerant foam paddings in sport gears applications. This paper describes the static response of reinforced microcell consisting of an outer spherical shell and uniformly distributed microspheres while quantifying the stiffening effect. The distribution of the microspheres is illustrated using the Fourier series, allowing tuning of the reinforcing strategy. Expressions of the external and internal works are derived, whereas the Ritz energy method is adopted to calculate the deformations due to a compressive load distributed over a range of areas. Emphasis is given to the effect of the geometrical attributes of the microcell and the reinforcing microspheres on the resulting deformation response and stiffening effect. The framework is used to investigate the response of several case studies to elucidate the effects of relative radii ratio, reinforcement density, microcell wall thickness, and loading configurations on the stiffness. A new normalized strain energy parameter is introduced to simplify and accelerate the analysis while providing insights on the underpinnings of the observed buckling response. The results strongly suggest the viability of the newly discovered foam microstructure in managing static loads while providing an opportunity to strategically tune the mechanical response using the analytical framework presented herein.